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Bethan Jones
07/06/2023
Biology
As Level Biology 1.6 - Nucleic acids and their Functions
102
•
7 Jun 2023
•
Bethan Jones
@bethanjones_jdhy
This DNA and RNA structure and function guide provides an... Show more
This page covers two main topics: the process of extracting DNA from cells and the structure and types of RNA involved in protein synthesis. The process of extracting DNA with cold salt solution is described in detail, highlighting the importance of using cold temperatures and detergents to protect and release DNA from cells.
Highlight: DNA can be easily extracted using a solution of ice-cold salt and washing-up liquid, which dissolves cell membranes and protects DNA from degradation.
The page then transitions to discussing the structure of RNA, emphasizing its differences from DNA. It explains that RNA is typically a shorter, single-stranded molecule with ribose sugar and uracil instead of thymine.
Definition: RNA is a single-stranded nucleic acid that differs from DNA in its sugar component and one of its nitrogenous bases.
The functions and types of RNA in protein synthesis are introduced, with brief descriptions of messenger RNA , ribosomal RNA , and transfer RNA . Each type of RNA is explained in terms of its structure and role in protein synthesis.
Example: Transfer RNA has a cloverleaf shape with an anticodon at one end and an amino acid at the other, facilitating the transfer of amino acids during translation.
This page delves deeper into the structure of tRNA and the primary functions of DNA. It begins with a detailed illustration of tRNA's cloverleaf structure, showing its various arms and the location of the anticodon.
Highlight: The tRNA molecule has a distinctive cloverleaf shape with several arms, including the anticodon arm that contains the three-base anticodon sequence.
The page then shifts focus to the two main functions of DNA: protein synthesis and replication. It explains how the sequence of bases in the template strand of DNA determines the order of amino acids in a polypeptide, emphasizing the importance of DNA in protein production.
Definition: DNA replication is the process by which a complete copy of DNA is made when cells divide.
The text introduces three theories for DNA replication: conservative, semi-conservative, and dispersive. Each theory is briefly explained, setting the stage for a more detailed discussion of the semi-conservative model in the following pages.
Vocabulary: Semi-conservative replication is the process where parental DNA strands separate and each acts as a template for synthesizing a new complementary strand.
This page focuses on the process of semi-conservative DNA replication and the groundbreaking Meselson-Stahl experiment that provided evidence for this model. The text details the steps involved in DNA replication, emphasizing the roles of key enzymes and molecules.
Example: DNA helicase breaks the hydrogen bonds between bases, causing the double helix to unwind and separate.
The page explains how DNA polymerase binds complementary nucleotides to form new strands, resulting in two DNA molecules, each containing one parent strand and one newly synthesized strand.
Highlight: The semi-conservative replication process ensures that each new DNA molecule contains one original parent strand and one newly synthesized complementary strand.
The Meselson-Stahl experiment is then introduced as a crucial study that determined the exact mechanism of DNA replication. The text outlines the experimental procedure, which involved growing bacteria in media containing different nitrogen isotopes and analyzing the resulting DNA.
Definition: The Meselson-Stahl experiment was designed to distinguish between the three proposed models of DNA replication: conservative, semi-conservative, and dispersive.
The page concludes by explaining how the results of this experiment provided strong evidence for the semi-conservative model of DNA replication.
This final page presents the results of the Meselson-Stahl experiment in a visual format, showing the distribution of DNA bands after centrifugation for different generations of bacteria grown in varying nitrogen isotope media. The diagram clearly illustrates how the DNA bands shift over generations, supporting the semi-conservative replication model.
Highlight: The Meselson-Stahl experiment results showed an intermediate-weight DNA band after one generation and a mixture of intermediate and light DNA bands after two generations, conclusively demonstrating semi-conservative replication.
The page then introduces the concept of the genetic code, explaining how sequences of nucleotides form codons that specify amino acids in protein synthesis.
Definition: A codon is a triplet of nucleotides that codes for a specific amino acid in the genetic code.
The text provides examples of DNA codons and their corresponding mRNA codons, illustrating the relationship between DNA sequences and the amino acids they encode.
Example: The DNA codon GGG corresponds to the mRNA codon CCC, demonstrating the complementary nature of DNA transcription to mRNA.
This final section ties together the concepts of DNA structure, replication, and the genetic code, providing a comprehensive overview of how genetic information is stored, replicated, and translated into proteins.
This page introduces the fundamental components of nucleic acids, focusing on the structure of nucleotides in DNA and RNA. Nucleotides are the building blocks of these essential molecules, each containing a phosphate group, a nitrogenous base, and a pentose sugar. The page also highlights the differences between DNA and RNA nucleotides, particularly in their sugar components and nitrogenous bases.
Vocabulary: Nucleotides are the monomers that make up DNA and RNA.
Definition: A nucleotide consists of three parts: a phosphate group, a nitrogen-containing organic base, and a pentose sugar.
The page further elaborates on the types of nitrogenous bases found in DNA and RNA, categorizing them into pyrimidines and purines. It lists the four bases found in DNA: guanine, cytosine, adenine, and thymine, noting that uracil replaces thymine in RNA.
Highlight: ATP is also a nucleotide, playing a crucial role in energy transfer within cells.
The page concludes with an explanation of ATP's function, describing how the hydrolysis of ATP by the enzyme ATPase releases energy for cellular use, forming ADP in a reversible reaction.
Example: ATP → ADP + Pi + 30.6kJ energy
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
Bethan Jones
@bethanjones_jdhy
This DNA and RNA structure and function guide provides an in-depth look at understanding nucleotide structure in DNA and RNA, the process of extracting DNA with cold salt solution, and the functions and types of RNA in protein... Show more
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page covers two main topics: the process of extracting DNA from cells and the structure and types of RNA involved in protein synthesis. The process of extracting DNA with cold salt solution is described in detail, highlighting the importance of using cold temperatures and detergents to protect and release DNA from cells.
Highlight: DNA can be easily extracted using a solution of ice-cold salt and washing-up liquid, which dissolves cell membranes and protects DNA from degradation.
The page then transitions to discussing the structure of RNA, emphasizing its differences from DNA. It explains that RNA is typically a shorter, single-stranded molecule with ribose sugar and uracil instead of thymine.
Definition: RNA is a single-stranded nucleic acid that differs from DNA in its sugar component and one of its nitrogenous bases.
The functions and types of RNA in protein synthesis are introduced, with brief descriptions of messenger RNA , ribosomal RNA , and transfer RNA . Each type of RNA is explained in terms of its structure and role in protein synthesis.
Example: Transfer RNA has a cloverleaf shape with an anticodon at one end and an amino acid at the other, facilitating the transfer of amino acids during translation.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page delves deeper into the structure of tRNA and the primary functions of DNA. It begins with a detailed illustration of tRNA's cloverleaf structure, showing its various arms and the location of the anticodon.
Highlight: The tRNA molecule has a distinctive cloverleaf shape with several arms, including the anticodon arm that contains the three-base anticodon sequence.
The page then shifts focus to the two main functions of DNA: protein synthesis and replication. It explains how the sequence of bases in the template strand of DNA determines the order of amino acids in a polypeptide, emphasizing the importance of DNA in protein production.
Definition: DNA replication is the process by which a complete copy of DNA is made when cells divide.
The text introduces three theories for DNA replication: conservative, semi-conservative, and dispersive. Each theory is briefly explained, setting the stage for a more detailed discussion of the semi-conservative model in the following pages.
Vocabulary: Semi-conservative replication is the process where parental DNA strands separate and each acts as a template for synthesizing a new complementary strand.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page focuses on the process of semi-conservative DNA replication and the groundbreaking Meselson-Stahl experiment that provided evidence for this model. The text details the steps involved in DNA replication, emphasizing the roles of key enzymes and molecules.
Example: DNA helicase breaks the hydrogen bonds between bases, causing the double helix to unwind and separate.
The page explains how DNA polymerase binds complementary nucleotides to form new strands, resulting in two DNA molecules, each containing one parent strand and one newly synthesized strand.
Highlight: The semi-conservative replication process ensures that each new DNA molecule contains one original parent strand and one newly synthesized complementary strand.
The Meselson-Stahl experiment is then introduced as a crucial study that determined the exact mechanism of DNA replication. The text outlines the experimental procedure, which involved growing bacteria in media containing different nitrogen isotopes and analyzing the resulting DNA.
Definition: The Meselson-Stahl experiment was designed to distinguish between the three proposed models of DNA replication: conservative, semi-conservative, and dispersive.
The page concludes by explaining how the results of this experiment provided strong evidence for the semi-conservative model of DNA replication.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This final page presents the results of the Meselson-Stahl experiment in a visual format, showing the distribution of DNA bands after centrifugation for different generations of bacteria grown in varying nitrogen isotope media. The diagram clearly illustrates how the DNA bands shift over generations, supporting the semi-conservative replication model.
Highlight: The Meselson-Stahl experiment results showed an intermediate-weight DNA band after one generation and a mixture of intermediate and light DNA bands after two generations, conclusively demonstrating semi-conservative replication.
The page then introduces the concept of the genetic code, explaining how sequences of nucleotides form codons that specify amino acids in protein synthesis.
Definition: A codon is a triplet of nucleotides that codes for a specific amino acid in the genetic code.
The text provides examples of DNA codons and their corresponding mRNA codons, illustrating the relationship between DNA sequences and the amino acids they encode.
Example: The DNA codon GGG corresponds to the mRNA codon CCC, demonstrating the complementary nature of DNA transcription to mRNA.
This final section ties together the concepts of DNA structure, replication, and the genetic code, providing a comprehensive overview of how genetic information is stored, replicated, and translated into proteins.
Access to all documents
Improve your grades
Join milions of students
By signing up you accept Terms of Service and Privacy Policy
This page introduces the fundamental components of nucleic acids, focusing on the structure of nucleotides in DNA and RNA. Nucleotides are the building blocks of these essential molecules, each containing a phosphate group, a nitrogenous base, and a pentose sugar. The page also highlights the differences between DNA and RNA nucleotides, particularly in their sugar components and nitrogenous bases.
Vocabulary: Nucleotides are the monomers that make up DNA and RNA.
Definition: A nucleotide consists of three parts: a phosphate group, a nitrogen-containing organic base, and a pentose sugar.
The page further elaborates on the types of nitrogenous bases found in DNA and RNA, categorizing them into pyrimidines and purines. It lists the four bases found in DNA: guanine, cytosine, adenine, and thymine, noting that uracil replaces thymine in RNA.
Highlight: ATP is also a nucleotide, playing a crucial role in energy transfer within cells.
The page concludes with an explanation of ATP's function, describing how the hydrolysis of ATP by the enzyme ATPase releases energy for cellular use, forming ADP in a reversible reaction.
Example: ATP → ADP + Pi + 30.6kJ energy
Our AI Companion is a student-focused AI tool that offers more than just answers. Built on millions of Knowunity resources, it provides relevant information, personalised study plans, quizzes, and content directly in the chat, adapting to your individual learning journey.
You can download the app from Google Play Store and Apple App Store.
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
App Store
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
Best app on earth! no words because it’s too good
Thomas R
iOS user
Just amazing. Let's me revise 10x better, this app is a quick 10/10. I highly recommend it to anyone. I can watch and search for notes. I can save them in the subject folder. I can revise it any time when I come back. If you haven't tried this app, you're really missing out.
Basil
Android user
This app has made me feel so much more confident in my exam prep, not only through boosting my own self confidence through the features that allow you to connect with others and feel less alone, but also through the way the app itself is centred around making you feel better. It is easy to navigate, fun to use, and helpful to anyone struggling in absolutely any way.
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
very reliable app to help and grow your ideas of Maths, English and other related topics in your works. please use this app if your struggling in areas, this app is key for that. wish I'd of done a review before. and it's also free so don't worry about that.
Rohan U
Android user
I know a lot of apps use fake accounts to boost their reviews but this app deserves it all. Originally I was getting 4 in my English exams and this time I got a grade 7. I didn’t even know about this app three days until the exam and it has helped A LOT. Please actually trust me and use it as I’m sure you too will see developments.
Xander S
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE THE SCHOOLGPT. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This apps acc the goat. I find revision so boring but this app makes it so easy to organize it all and then you can ask the freeeee ai to test yourself so good and you can easily upload your own stuff. highly recommend as someone taking mocks now
Paul T
iOS user