Aqa a level biology 4 Study guides, Class notes & Summaries

Many different substances enter and leave a cell by crossing its cell surface membrane. Describe how substances can cross a cell surface membrane. (5) 1 (Simple / facilitated) diffusion from high to low concentration / down concentration gradient; 2 Small / non-polar / lipid-soluble molecules pass via phospholipids / bilayer; OR Large / polar / water-soluble molecules go through proteins; 3 Water moves by osmosis / from high water potential to low water potential / from less to more nega...

AQA A Level Biology

AQA A level BIOLOGY 7402/3 Paper 3 Mark scheme June 2023. (There are) stretch-mediated sodium ion channels (in the membrane); 2. (Increased pressure) deforms/changes (sensory neurone/axon) membrane/lamella(e) OR (Increased pressure) deforms/changes sodium ion channels; 3. Sodium ion channels open; 4. Sodium ions diffuse in; 5. Depolarisation (leading to generator potential); 3 max (3 x AO1) 1. 2. 3. or 4. Accept Na+ Max 2 if only reference to sodium and not sodium ions 4. Accep...

AQA A-Level Biology Chapter 3.2 – Cells Exam || All Questions & Answers (Rated A+) AQA A-Level Biology Chapter 3.2 – Cells Exam || All Questions & Answers (Rated A+) Structure of Nucleus. - ANSWER - 1. Nuclear envelope: double membrane surrounding nucleus, outer membrane continuous with the (R)ER of the cell. 2. Nuclear pores: allow the passage of larger molecules, such as mRNA, out of the nucleus. 3. Nucleoplasm: granular, jelly-like material making up the bulk of the nucleus. ...

AQA A - LEVEL BIOLOGY PAPER 1 TOPIC 1 - 4 EXAM GUIDE QNS & ANS JUNE 2024AQA A - LEVEL BIOLOGY PAPER 1 TOPIC 1 - 4 EXAM GUIDE QNS & ANS JUNE 2024AQA A - LEVEL BIOLOGY PAPER 1 TOPIC 1 - 4 EXAM GUIDE QNS & ANS JUNE 2024

AQA A-level Biology Topic 4 Questions and Answers Latest (2023 / 2024) (Verified Answers)

AQA A-Level Biology Paper 1 Predicted Paper 2023 attached with markingscheme Name …………………………………………………………………… Date ………………… 2 hours allowed. You may use a scientific calculator and a ruler with millimetre measurements. Grade boundaries These are VERY rough guesses! Getting a B on this paper does not guarantee you the same mark in the exam. • A* 65% • A 55% • B 45% • C 40% • D 35% • E 30% ...

2023 AQA A-level BIOLOGY 7402/2 Paper 2 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. A-level BIOLOGY Paper 2 Friday 16 June 2023 Morning Time allowed: 2 hours Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen...

2023 AQA A-level BIOLOGY 7402/3 Paper 3 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED] Please write clearly in block capitals. Centre number Candidate number Surname Forename(s) Candidate signature I declare this is my own work. A-level BIOLOGY Paper 3 Wednesday 21 June 2023 Morning Time allowed: 2 hours Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point ...