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Exam (elaborations)

Biology Aqa A Level Topic 2 Cells Questions And Answers

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BIOLOGY AQA A LEVEL TOPIC 2 CELLS QUESTIONS AND ANSWERS

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What are channel proteins? + drawing


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a protein that forms pores in the membrane for charge proteins to diffuse
through




What happens in anaphase?


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Sister chromatids split and move to either pole (Disjunction)

,What is the plasmid


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circular piece of DNA




In normal temperatures what happens to the membrane (x2)


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fluid and partially membrane




What is the nucleus structure (+function)


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double membrane called the envelope, contains nuclear pores that enables
molecules to enter and leave. Nucleolus is the site of ribosome production.




Rate of facilitated diffusion depends on


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, concentration gradient, number of channel proteins




Phospholipids have a hint: head


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hydrophilic head and hydrophobic tail




function of chloroplast


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Site of photosynthesis




What is diffusion?


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net random movement of particles from an area of high concentration to an
area of low concentration down a concentration gradient until equilibrium is
reached




function of mitochondria

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site of aerobic respiration to produce ATP




Principles of microscopes


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Simple convex glass lenses
Short distance by first lens
Magnified by second lens




What are carrier proteins? + drawing


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A protein that transports large molecules across a membrane




3 details about viruses


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May 2, 2026
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