Biology > AQA > AQA_A Level Biology Paper 2_Mark Scheme 2022 | Practice Paper 2 (All)

AQA_A Level Biology Paper 2_Mark Scheme 2022 | Practice Paper 2

Document Content and Description Below

AQA A Level Biology Paper 2 Mark Scheme 2022 - - - - 1 (a) Prevents oxygen being taken up / entering / being absorbed; 1 Accept: any idea of no contact with oxygen. Neutral: for anaerobic res... piration / anaerobic conditions. Neutral: prevents entry of air. Reject: prevents entry of oxygen and another named gas. (b) (i) 0.0155 / 0.016 = 2 marks;; 2 0.0775 / 0.077 / 0.078 / 0.08 = 1 mark / 0.62 = 1 mark (ii) Glucose decreases / is a limiting factor / increase in ethanol / yeast / 1 cells die / toxins build up; Accept: glucose is used up. (iii) 1. (Stays the) same / level / (relatively) constant; 2 2. Same volume / amount of oxygen uptake and carbon dioxide release; Note: if m.p.1 is awarded m.p 2 can be obtained without referring to ‘same volume / amount’. (c) 1. Oxygen is final / terminal (electron) acceptor / oxygen combines 2 with electrons and protons; 2. Oxidative phosphorylation / electron transport chain provides (most) ATP / only glycolysis occurs without oxygen / no Krebs / no link reaction; [Total 8 marks] 2 (a) 1. (In myelinated) action potential / depolarisation only at node(s); 3 2. (In myelinated, nerve impulse) jumps from node to node / saltatory; 3. (In myelinated) action potential / impulse does not travel along whole length; The question is about speed of transmission, not repolarisation or related matters Accept converse for non-myelinated (b) 1. Probability of obtaining this difference by chance; 2 max Reject ‘results’ once only/ This statement often split round 2. 2. Is less than 5% / less than 0.05 / less than one in twenty; Accept is 4.7% / 0.047 but reject less than 4.7% / 0.047 Accept correct greater than 95% / greater than 0.95 arguments 3. Difference is significant; 1 max for 'the probability that the results are due to chance is less than 5% - - - AQA A Level Biology Paper 2 Mark Scheme 2022 - - - - 1 (a) Prevents oxygen being taken up / entering / being absorbed; 1 Accept: any idea of no contact with oxygen. Neutral: for anaerobic respiration / anaerobic conditions. Neutral: prevents entry of air. Reject: prevents entry of oxygen and another named gas. (b) (i) 0.0155 / 0.016 = 2 marks;; 2 0.0775 / 0.077 / 0.078 / 0.08 = 1 mark / 0.62 = 1 mark (ii) Glucose decreases / is a limiting factor / increase in ethanol / yeast / 1 cells die / toxins build up; Accept: glucose is used up. (iii) 1. (Stays the) same / level / (relatively) constant; 2 2. Same volume / amount of oxygen uptake and carbon dioxide release; Note: if m.p.1 is awarded m.p 2 can be obtained without referring to ‘same volume / amount’. (c) 1. Oxygen is final / terminal (electron) acceptor / oxygen combines 2 with electrons and protons; 2. Oxidative phosphorylation / electron transport chain provides (most) ATP / only glycolysis occurs without oxygen / no Krebs / no link reaction; [Total 8 marks] 2 (a) 1. (In myelinated) action potential / depolarisation only at node(s); 3 2. (In myelinated, nerve impulse) jumps from node to node / saltatory; 3. (In myelinated) action potential / impulse does not travel along whole length; The question is about speed of transmission, not repolarisation or related matters Accept converse for non-myelinated (b) 1. Probability of obtaining this difference by chance; 2 max Reject ‘results’ once only/ This statement often split round 2. 2. Is less than 5% / less than 0.05 / less than one in twenty; Accept is 4.7% / 0.047 but reject less than 4.7% / 0.047 Accept correct greater than 95% / greater than 0.95 arguments 3. Difference is significant; 1 max for 'the probability that the results are due to chance is less than 5% - - - AQA A Level Biology Paper 2 Mark Scheme 2022 - - - - 1 (a) Prevents oxygen being taken up / entering / being absorbed; 1 Accept: any idea of no contact with oxygen. Neutral: for anaerobic respiration / anaerobic conditions. Neutral: prevents entry of air. Reject: prevents entry of oxygen and another named gas. (b) (i) 0.0155 / 0.016 = 2 marks;; 2 0.0775 / 0.077 / 0.078 / 0.08 = 1 mark / 0.62 = 1 mark (ii) Glucose decreases / is a limiting factor / increase in ethanol / yeast / 1 cells die / toxins build up; Accept: glucose is used up. (iii) 1. (Stays the) same / level / (relatively) constant; 2 2. Same volume / amount of oxygen uptake and carbon dioxide release; Note: if m.p.1 is awarded m.p 2 can be obtained without referring to ‘same volume / amount’. (c) 1. Oxygen is final / terminal (electron) acceptor / oxygen combines 2 with electrons and protons; 2. Oxidative phosphorylation / electron transport chain provides (most) ATP / only glycolysis occurs without oxygen / no Krebs / no link reaction; [Total 8 marks] 2 (a) 1. (In myelinated) action potential / depolarisation only at node(s); 3 2. (In myelinated, nerve impulse) jumps from node to node / saltatory; 3. (In myelinated) action potential / impulse does not travel along whole length; The question is about speed of transmission, not repolarisation or related matters Accept converse for non-myelinated (b) 1. Probability of obtaining this difference by chance; 2 max Reject ‘results’ once only/ This statement often split round 2. 2. Is less than 5% / less than 0.05 / less than one in twenty; Accept is 4.7% / 0.047 but reject less than 4.7% / 0.047 Accept correct greater than 95% / greater than 0.95 arguments 3. Difference is significant; 1 max for 'the probability that the results are due to chance is less than 5% - - - [Show More]

Last updated: 1 year ago

Preview 1 out of 5 pages

Add to cart

Instant download

document-preview

Buy this document to get the full access instantly

Instant Download Access after purchase

Add to cart

Instant download

Reviews( 0 )

AQA

$7.50

Add to cart

Instant download

Can't find what you want? Try our AI powered Search

OR

REQUEST DOCUMENT
532
0

Document information


Connected school, study & course


About the document


Uploaded On

May 30, 2022

Number of pages

5

Written in

Seller


seller-icon
A-Level Guru

Member since 2 years

525 Documents Sold


Additional information

This document has been written for:

Uploaded

May 30, 2022

Downloads

 0

Views

 532

Document Keyword Tags

Recommended For You

Get more on AQA »
What is Browsegrades

In Browsegrades, a student can earn by offering help to other student. Students can help other students with materials by upploading their notes and earn money.

We are here to help

We're available through e-mail, Twitter, Facebook, and live chat.
 FAQ
 Questions? Leave a message!

Follow us on
 Twitter

Copyright © Browsegrades · High quality services·