Biology aqa as leve - Study guides, Class notes & Summaries

2024 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 VERIFIED / Biology AQA AS level 7401/1 Paper 1 Describe the induced-fit model of enzyme action - ANSWER-- active site not complementary to/does not fit substrate - Shape of active site changes as enzyme- substrate complex forms - Distorting bonds (in substrate leading to reaction) • The human cell then makes a complementary strand to the HIV DNA. The complementary strand is made in the same way as a ne...

AQA AS Level Biology Paper 2 2020Mark scheme AQA BIOLOGY AS LEVEL JUNE PAPER 2 Mark Scheme S - The Marketplace for Revision Notes & Study Guides AS BIOLOGY 7401/2 Paper 2 Mark schemeJune 2020 Version: 1.0 Final *206A7401/2/MS*

BIOLOGY AQA AS LEVEL 74011 PAPER 1[REAL 100%] • The human cell then makes a complementary strand to the HIV DNA. The complementary strand is made in the same way as a new complementary strand is made during semi-conservative replication of human DNA. Describe how the complementary strand of HIV DNA is made. - ANS---- there are complementary nucleotides/bases pair - DNA polymerase used - Nucleotides join together (to form new strand)/phosphodiester bonds form; Describe the difference be...

AQA AS Level Biology Paper 2 2020Mark scheme AQA BIOLOGY AS LEVEL JUNE PAPER 2 Mark Scheme S - The Marketplace for Revision Notes & Study Guides AS BIOLOGY 7401/2 Paper 2 Mark schemeJune 2020 Version: 1.0 Final *206A7401/2/MS* S - The Marketplace for Revision Notes & Study Guides MARK SCHEME – AS BIOLOGY – 7401/2 – JUNE 2020 Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevantiquestions, by a panel of subject teachers. This mar...

Describe a method you could use to find the surface area of the leaf(3) - Answer 1.Draw around the leaf of graph paper 2.Count the number of squares 3.Multiply by 2 for upper and lower surfaces of the leaf Explain the advantage of stomata closing when the light is turned off (2) - Answer 1.Water is lost through the stomata 2.Closure of stomata reduces water loss 3.Maintain water content in cells Describe the induced fit model of enzyme action (2) - Answer 1.Before reaction...

AQA AS Level Biology Paper 2 2020 Mark scheme AQA BIOLOGY AS LEVEL JUNE PAPER 2 Mark Scheme Mark scheme instructions to examiners 1. General The mark scheme for each question shows: • the marks available for each part of the question • the total marks available for the question • the typical answer or answers which are expected • Extra information to help the examiner make his or her judgement and help to delineate whatiiis acceptable or not worthy of credit or, in discu...

AQA AS Level Biology Paper 2 2020Mark scheme AQA BIOLOGY AS LEVEL JUNE PAPER 2 Mark Scheme S - The Marketplace for Revision Notes & Study Guides AS BIOLOGY 7401/2 Paper 2 Mark schemeJune 2020 Version: 1.0 Final *206A7401/2/MS* S - The Marketplace for Revision Notes & Study Guides MARK SCHEME – AS BIOLOGY – 7401/2 – JUNE 2020 Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevantiquestions, by a panel of subject teachers. This mar...

AQA AS Level Biology Paper 2 2020Mark scheme AQA BIOLOGY AS LEVEL JUNE PAPER 2 Mark Scheme S - The Marketplace for Revision Notes & Study Guides AS BIOLOGY 7401/2 Paper 2 Mark schemeJune 2020 Version: 1.0 Final *206A7401/2/MS* S - The Marketplace for Revision Notes & Study Guides MARK SCHEME – AS BIOLOGY – 7401/2 – JUNE 2020 Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevantiquestions, by a panel of subject teachers. This mar...

2024 AQA AS Level Biology Paper 2 2020Mark scheme AQA BIOLOGY AS LEVEL JUNE PAPER 2 Mark Scheme 0 Mark scheme AQA AS Level Biology Paper AS BIOLOGY 7401/2 Paper 2 Mark schemeJune 2020 Version: 1.0 Final *206A7401/2/MS* MARK SCHEME – AS BIOLOGY – 7401/2 – JUNE 2020 Mark schemes are prepared by the Lead Assessment Writer and considered, together with the relevantiiquestions, by a pan...