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Summary AQA Biology AS (Year 1) - A4 Notes $5.18   Add to cart

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Summary AQA Biology AS (Year 1) - A4 Notes

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This document contains detailed A4 notes from the first year of A-Level (AS). Chapters include : Biological molecules (test to identify molecules) Mitosis Microscopes Transported across cell membranes Cell recognition and immune system (phagocytosis, humoral and cell mediated response) Exchange M...

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  • Chapter 1, 3, 4, 5, 6, 7, 10
  • September 24, 2019
  • 33
  • 2018/2019
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Available practice questions

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Some examples from this set of practice questions

1.

What is Osmosis?

Answer: The passage of water from a region where it has a higher water potential to a region where it has a lower water potential through a selectively permeable membrane. Selectively permeable plasma membrane only allow water molecules across it.

2.

Define Diffusion ?

Answer: The net movement of molecules or ions from a region where they are more highly concentrated to one where their concentration is lower until evenly distributed.

3.

Explain Active transport ...

Answer: the movement of molecules / ions into or out of a cell from a region of low concentration to a region of higher concentration using ATP and carrier protein. Requires ATP \"Protein pump\"

4.

What is simple diffusion ?

Answer: From high to low concentration Passive transport, energy comes from natural inbuilt motion of particles No energy needed - ie. NO ATP

5.

What is Facilitated Diffusion ?

Answer: through protein channels channels move specific molecules across no energy needed

6.

What is the function of a : Phospholipid Bilayer ?

Answer: Allow lipid soluble substances to enter and leave the cell Prevents water soluble substances entering and leaving the cell Makes the membrane flexible and self-sealing

7.

What is hydrostatic pressure ? What does it do ?

Answer: is the pressure created by the pumping of the heart it causes tissue fluid to move out of the blood plasma

8.

What are the capillaries function ?

Answer: to exchange metabolic materials such as oxygen, CO2 and glucose between the blood and the cells of the body

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