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Food Tests You Need to Know
Ever wondered how scientists work out what's actually in your food? These four food tests are dead simple once you get the hang of them, and they're proper exam favourites too.
The Biuret test spots protein by turning violet when you add sodium hydroxide and copper sulfate to your food sample. For fats, the emulsion test uses ethanol and water to create a milky white colour that screams "lipids present!"
Benedict's test is brilliant for detecting simple sugars - it goes from blue to brick red if there's loads of sugar, orange for medium amounts, and yellow-green for just a tiny bit. Finally, the iodine test for starch is the easiest: just add iodine drops and look for that distinctive blue-black colour.
Top Tip: Remember the colours! Violet = protein, milky white = fat, brick red = lots of sugar, blue-black = starch. Get these right and you're laughing.
Proteins - Your Body's Building Blocks
Think of proteins as your body's construction workers - they build everything from your muscles and hair to your nails and enzymes. Without enough protein, you'd literally fall apart!
Amino acids are the real stars here - they're the building blocks that make proteins so versatile. There are 20 different types, and they link together in massive chains to create thousands of different proteins your body needs.
You'll find loads of protein in chicken, eggs, milk, cheese, beans, and fish. Your body needs these foods daily because protein deficiency (called kwashiorkor) can cause serious health problems.
Remember: Proteins contain carbon, hydrogen, oxygen, and nitrogen - that nitrogen is what makes them special and different from carbs and fats.
Vitamins and Minerals - Small but Mighty
Don't let their tiny amounts fool you - vitamins and minerals pack a serious punch when it comes to keeping you healthy. Miss out on these, and your body quickly lets you know!
Vitamin A (found in dairy, liver, and carrots) keeps your immune system strong and prevents night blindness. Vitamin C from citrus fruits acts like your body's repair kit, fixing tissues and preventing scurvy. Vitamin D from sunlight helps your bones absorb calcium properly.
Calcium builds strong teeth and bones (think milk and dairy), while iron from meat and spinach keeps your blood healthy. Without iron, you'll feel tired and look pale - definitely not a good look!
Fun Fact: Sailors used to get scurvy on long voyages because they couldn't get fresh vitamin C. That's why British sailors were called "limeys" - they ate limes to stay healthy!
Lipids - More Than Just Fat
Lipids get a bad reputation, but they're actually essential for your body. They store energy, protect your organs, and even help insulate you like a natural winter coat under your skin.
Fats are solid at room temperature and usually come from animals - think butter, lard, and fatty meat. Oils stay liquid and mostly come from plants like olives, avocados, and sunflowers. Both contain carbon, hydrogen, and oxygen, but lipids have way less oxygen than carbohydrates.
The key difference is saturation - saturated fats (mostly from animals) can clog your arteries, while unsaturated fats (mostly from plants) are much healthier for your heart.
Health Check: Your body needs some fat to function, but too much saturated fat increases your risk of heart disease. Balance is everything!
Lipid Structure - Simple but Effective
Lipids might look complicated, but their structure is actually dead straightforward. Every fat molecule is basically just glycerol (think of it as the backbone) attached to three fatty acids - that's why they're called triglycerides.
The magic happens in those fatty acid chains. Saturated fats have no double bonds between carbon atoms - they're "saturated" with hydrogen. Unsaturated fats have one or more double bonds, making them healthier but also explaining why they stay liquid at room temperature.
Polyunsaturated fats have loads of double bonds and are the healthiest option. You'll find them mainly in plant sources, while saturated fats dominate animal products and increase heart disease risk.
Memory Trick: Saturated = stuffed full of hydrogen. Unsaturated = missing some hydrogen atoms where the double bonds are.
Carbohydrates - Your Body's Fuel Tank
Carbohydrates are basically your body's petrol - they're the main fuel that powers all your cells. About 5% of your body weight is carbs, and without them, you'd have zero energy for anything.
All carbohydrates contain carbon, hydrogen, and oxygen in specific ratios. The simplest ones are monosaccharides like glucose - single sugar molecules that give you instant energy through respiration and keep your blood sugar levels steady.
Your body gets glucose mainly through photosynthesis in plants, which convert sunlight into the sugars you need. It's like plants are solar-powered sugar factories working just for you!
Quick Energy: Monosaccharides hit your bloodstream fast, which is why athletes often drink glucose drinks during competitions.
Types of Carbohydrates
Carbohydrates come in three main sizes, and size definitely matters when it comes to how quickly your body can use them for energy.
Disaccharides are "double sugars" - basically two monosaccharides stuck together. Lactose in milk is a perfect example, made from glucose plus galactose. Your body breaks these down fairly quickly for energy.
Polysaccharides are the marathon runners of the carb world - long chains of sugars like starch, glycogen, and cellulose. These complex carbohydrates provide long-term energy storage and take more work for your body to break down.
Size Matters: The more sugars joined together, the longer it takes your body to break them down - that's why complex carbs give you sustained energy rather than a quick sugar rush.
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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
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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.
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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
Understanding Food in Biology
Food testing and nutrition are essential topics in biology that help us understand what's actually in our food and how our bodies use different nutrients. You'll learn simple lab tests to identify proteins, fats, sugars, and starch, plus discover how... Show more
Food Tests You Need to Know
Ever wondered how scientists work out what's actually in your food? These four food tests are dead simple once you get the hang of them, and they're proper exam favourites too.
The Biuret test spots protein by turning violet when you add sodium hydroxide and copper sulfate to your food sample. For fats, the emulsion test uses ethanol and water to create a milky white colour that screams "lipids present!"
Benedict's test is brilliant for detecting simple sugars - it goes from blue to brick red if there's loads of sugar, orange for medium amounts, and yellow-green for just a tiny bit. Finally, the iodine test for starch is the easiest: just add iodine drops and look for that distinctive blue-black colour.
Top Tip: Remember the colours! Violet = protein, milky white = fat, brick red = lots of sugar, blue-black = starch. Get these right and you're laughing.
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By signing up you accept Terms of Service and Privacy Policy
Proteins - Your Body's Building Blocks
Think of proteins as your body's construction workers - they build everything from your muscles and hair to your nails and enzymes. Without enough protein, you'd literally fall apart!
Amino acids are the real stars here - they're the building blocks that make proteins so versatile. There are 20 different types, and they link together in massive chains to create thousands of different proteins your body needs.
You'll find loads of protein in chicken, eggs, milk, cheese, beans, and fish. Your body needs these foods daily because protein deficiency (called kwashiorkor) can cause serious health problems.
Remember: Proteins contain carbon, hydrogen, oxygen, and nitrogen - that nitrogen is what makes them special and different from carbs and fats.
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Vitamins and Minerals - Small but Mighty
Don't let their tiny amounts fool you - vitamins and minerals pack a serious punch when it comes to keeping you healthy. Miss out on these, and your body quickly lets you know!
Vitamin A (found in dairy, liver, and carrots) keeps your immune system strong and prevents night blindness. Vitamin C from citrus fruits acts like your body's repair kit, fixing tissues and preventing scurvy. Vitamin D from sunlight helps your bones absorb calcium properly.
Calcium builds strong teeth and bones (think milk and dairy), while iron from meat and spinach keeps your blood healthy. Without iron, you'll feel tired and look pale - definitely not a good look!
Fun Fact: Sailors used to get scurvy on long voyages because they couldn't get fresh vitamin C. That's why British sailors were called "limeys" - they ate limes to stay healthy!
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Lipids - More Than Just Fat
Lipids get a bad reputation, but they're actually essential for your body. They store energy, protect your organs, and even help insulate you like a natural winter coat under your skin.
Fats are solid at room temperature and usually come from animals - think butter, lard, and fatty meat. Oils stay liquid and mostly come from plants like olives, avocados, and sunflowers. Both contain carbon, hydrogen, and oxygen, but lipids have way less oxygen than carbohydrates.
The key difference is saturation - saturated fats (mostly from animals) can clog your arteries, while unsaturated fats (mostly from plants) are much healthier for your heart.
Health Check: Your body needs some fat to function, but too much saturated fat increases your risk of heart disease. Balance is everything!
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Lipid Structure - Simple but Effective
Lipids might look complicated, but their structure is actually dead straightforward. Every fat molecule is basically just glycerol (think of it as the backbone) attached to three fatty acids - that's why they're called triglycerides.
The magic happens in those fatty acid chains. Saturated fats have no double bonds between carbon atoms - they're "saturated" with hydrogen. Unsaturated fats have one or more double bonds, making them healthier but also explaining why they stay liquid at room temperature.
Polyunsaturated fats have loads of double bonds and are the healthiest option. You'll find them mainly in plant sources, while saturated fats dominate animal products and increase heart disease risk.
Memory Trick: Saturated = stuffed full of hydrogen. Unsaturated = missing some hydrogen atoms where the double bonds are.
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Carbohydrates - Your Body's Fuel Tank
Carbohydrates are basically your body's petrol - they're the main fuel that powers all your cells. About 5% of your body weight is carbs, and without them, you'd have zero energy for anything.
All carbohydrates contain carbon, hydrogen, and oxygen in specific ratios. The simplest ones are monosaccharides like glucose - single sugar molecules that give you instant energy through respiration and keep your blood sugar levels steady.
Your body gets glucose mainly through photosynthesis in plants, which convert sunlight into the sugars you need. It's like plants are solar-powered sugar factories working just for you!
Quick Energy: Monosaccharides hit your bloodstream fast, which is why athletes often drink glucose drinks during competitions.
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Types of Carbohydrates
Carbohydrates come in three main sizes, and size definitely matters when it comes to how quickly your body can use them for energy.
Disaccharides are "double sugars" - basically two monosaccharides stuck together. Lactose in milk is a perfect example, made from glucose plus galactose. Your body breaks these down fairly quickly for energy.
Polysaccharides are the marathon runners of the carb world - long chains of sugars like starch, glycogen, and cellulose. These complex carbohydrates provide long-term energy storage and take more work for your body to break down.
Size Matters: The more sugars joined together, the longer it takes your body to break them down - that's why complex carbs give you sustained energy rather than a quick sugar rush.
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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