Biology covers key processes that keep living things functioning. From...
Biology379 views·Updated 28 Jul 2026·4 pagesAQA Biology Paper 1 Combined Science Higher
Faye Findlay@fayefindlay_ylvf
1 / 4
1
of 4
Energy in Living Organisms
Ever wondered how plants make their own food? During photosynthesis, plants use carbon dioxide and water to produce glucose and oxygen . This process needs light energy and is affected by the intensity of light - the closer the light source, the more effective the process.
Plants don't waste the glucose they produce. They use it for respiration, building cellulose for cell walls, making amino acids, and storing energy as oils, fats or starch for later use. However, photosynthesis can be limited by factors like light intensity, temperature, CO₂ availability, and amount of chlorophyll.
Respiration is how all living cells release energy from glucose. In aerobic respiration, cells use oxygen to break down glucose completely (glucose + oxygen → carbon dioxide + water). This happens in specialized cell structures called mitochondria. When oxygen is limited, cells switch to anaerobic respiration, producing lactic acid instead and releasing less energy.
Did you know? Every cell in your body is constantly performing respiration, even when you're sleeping. This process provides the energy needed for everything from thinking to running.
2
of 4
Fighting Disease
Your body is constantly under attack from pathogens - microorganisms that cause disease. These come in various forms, each with their own ways of causing harm. Viruses like measles and HIV replicate inside your cells, creating copies that burst out and infect more cells. Bacteria like Salmonella produce toxins that damage tissues, while fungi can penetrate skin causing infections.
Your immune system fights back using white blood cells that consume pathogens, produce antibodies to tag them for destruction, and create antitoxins to neutralize harmful bacterial products. It's like having your own personal army!
Vaccines are one of medicine's greatest tools against disease. They contain dead or weakened pathogens that can't cause illness but still carry the antigens (markers) that trigger your immune system. This gives your body a chance to prepare its defenses before encountering the real pathogen.
Remember this: Vaccines don't just protect you - they protect everyone around you by reducing the spread of communicable diseases. This is called herd immunity.
3
of 4
Body Organisation and Function
Your body is organized in increasingly complex levels - cells combine to form tissues, tissues form organs, and organs work together in organ systems. This organization allows for specialized functions throughout your body.
The circulatory system demonstrates this perfectly. Your heart pumps oxygenated blood through arteries to body tissues via a double circulatory system. Meanwhile, deoxygenated blood returns through veins to the heart, then travels to the lungs to collect oxygen and remove carbon dioxide.
Digestion shows how different organs work together to process food. Special proteins called enzymes act as biological catalysts in this process. Each enzyme has a specific active site that fits only one substrate (like a lock and key), and they work best at specific temperatures and pH levels. Different enzymes break down specific nutrients - amylase for carbohydrates, proteases for proteins, and lipases for fats.
Fascinating fact: Your blood contains different components with specific jobs: red blood cells carry oxygen, white blood cells fight infection, platelets help with clotting, and plasma transports everything around your body.
4
of 4
Cell Structure and Function
Cells are the building blocks of life, but they're not all the same. Eukaryotic cells (found in animals and plants) have a nucleus and membrane-bound organelles. Plant cells have additional features like chloroplasts for photosynthesis, a rigid cell wall, and a large vacuole. Prokaryotic cells like bacteria are simpler, lacking a true nucleus.
How do cells get what they need? Diffusion is the movement of particles from high to low concentration areas. Osmosis is specifically the movement of water molecules across a partially permeable membrane. When cells need to move substances against concentration gradients, they use active transport, which requires energy.
The cell cycle ensures organisms can grow and repair themselves. During interphase, the cell grows and copies its DNA. This is followed by mitosis (nuclear division) and cytokinesis (cytoplasm division). Stem cells are special cells that can divide to form different cell types - embryonic stem cells can form all cell types, while adult stem cells are more limited.
Quick tip: When studying cell structures, remember that form follows function. The structure of each cell type (like sperm, nerve, or muscle cells) is perfectly adapted to its specific job in the body.
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Biology379 views·Updated 28 Jul 2026·4 pagesAQA Biology Paper 1 Combined Science Higher
Faye Findlay@fayefindlay_ylvf
Biology covers key processes that keep living things functioning. From energy production to disease prevention, these concepts help us understand how our bodies work and how organisms interact with their environment. Let's explore these fundamental biological processes that form the...
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Energy in Living Organisms
Ever wondered how plants make their own food? During photosynthesis, plants use carbon dioxide and water to produce glucose and oxygen . This process needs light energy and is affected by the intensity of light - the closer the light source, the more effective the process.
Plants don't waste the glucose they produce. They use it for respiration, building cellulose for cell walls, making amino acids, and storing energy as oils, fats or starch for later use. However, photosynthesis can be limited by factors like light intensity, temperature, CO₂ availability, and amount of chlorophyll.
Respiration is how all living cells release energy from glucose. In aerobic respiration, cells use oxygen to break down glucose completely (glucose + oxygen → carbon dioxide + water). This happens in specialized cell structures called mitochondria. When oxygen is limited, cells switch to anaerobic respiration, producing lactic acid instead and releasing less energy.
Did you know? Every cell in your body is constantly performing respiration, even when you're sleeping. This process provides the energy needed for everything from thinking to running.
2
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Fighting Disease
Your body is constantly under attack from pathogens - microorganisms that cause disease. These come in various forms, each with their own ways of causing harm. Viruses like measles and HIV replicate inside your cells, creating copies that burst out and infect more cells. Bacteria like Salmonella produce toxins that damage tissues, while fungi can penetrate skin causing infections.
Your immune system fights back using white blood cells that consume pathogens, produce antibodies to tag them for destruction, and create antitoxins to neutralize harmful bacterial products. It's like having your own personal army!
Vaccines are one of medicine's greatest tools against disease. They contain dead or weakened pathogens that can't cause illness but still carry the antigens (markers) that trigger your immune system. This gives your body a chance to prepare its defenses before encountering the real pathogen.
Remember this: Vaccines don't just protect you - they protect everyone around you by reducing the spread of communicable diseases. This is called herd immunity.
3
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Body Organisation and Function
Your body is organized in increasingly complex levels - cells combine to form tissues, tissues form organs, and organs work together in organ systems. This organization allows for specialized functions throughout your body.
The circulatory system demonstrates this perfectly. Your heart pumps oxygenated blood through arteries to body tissues via a double circulatory system. Meanwhile, deoxygenated blood returns through veins to the heart, then travels to the lungs to collect oxygen and remove carbon dioxide.
Digestion shows how different organs work together to process food. Special proteins called enzymes act as biological catalysts in this process. Each enzyme has a specific active site that fits only one substrate (like a lock and key), and they work best at specific temperatures and pH levels. Different enzymes break down specific nutrients - amylase for carbohydrates, proteases for proteins, and lipases for fats.
Fascinating fact: Your blood contains different components with specific jobs: red blood cells carry oxygen, white blood cells fight infection, platelets help with clotting, and plasma transports everything around your body.
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Cell Structure and Function
Cells are the building blocks of life, but they're not all the same. Eukaryotic cells (found in animals and plants) have a nucleus and membrane-bound organelles. Plant cells have additional features like chloroplasts for photosynthesis, a rigid cell wall, and a large vacuole. Prokaryotic cells like bacteria are simpler, lacking a true nucleus.
How do cells get what they need? Diffusion is the movement of particles from high to low concentration areas. Osmosis is specifically the movement of water molecules across a partially permeable membrane. When cells need to move substances against concentration gradients, they use active transport, which requires energy.
The cell cycle ensures organisms can grow and repair themselves. During interphase, the cell grows and copies its DNA. This is followed by mitosis (nuclear division) and cytokinesis (cytoplasm division). Stem cells are special cells that can divide to form different cell types - embryonic stem cells can form all cell types, while adult stem cells are more limited.
Quick tip: When studying cell structures, remember that form follows function. The structure of each cell type (like sperm, nerve, or muscle cells) is perfectly adapted to its specific job in the body.
We thought you’d never ask...
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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Most popular content: Protein
7Biologybiology paper 1
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Students love us — and so will you.
4.6/5App Store
4.7/5Google 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 SiOS 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 KlichAndroid 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.
AnnaiOS user