74011 - Study guides, Class notes & Summaries

AS BIOLOGY 7401/1 Paper 1 Mark scheme June 2023

BIOLOGY AQA AS 74011 PAPER 1 [WELL VERIFIED] • 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; Contrast the ...

2023 AQA AS BIOLOGY PAPER 1 QUESTION PAPER AND MARK SCHEME 74011 BUNDLE

aqa AS BIOLOGY Paper 1 (7401/1) Mark scheme June2023

AQA AS BIOLOGY 7401/1 Paper 1 / AQA A LEVEL BIO QUESTIONS Question Paper & Mark scheme Merged June 2023 VERIFIED Q1.(a) Describe how you would test a piece of food for the presence of lipid. ....................................................................................................................... . ....................................................................................................................... . .........................................................

AQA AS BIOLOGY 7401/1 Paper 1 Version: 1.0 Final *JUN* IB/M/Jun23/E8 7401/1 For Examiner’s Use Question Mark 1 2 3 4 5 6 7 8 9 TOTAL Monday 15 May 2023 Morning Time allowed: 1 hour 30 minutes Materials For this paper you must have: • a ruler with millimetre measurements • a scientific calculator. Instructions • Use black ink or black ball-point pen. • Fill in the boxes at the top of this page. • Answer all questions. • You must answer the questions in t...

AQA AS Biology 7401/1 Paper 1 June 2024

AQA AS Biology 7401/1 Paper 1 June 2024

AS Biology (7401/1) Paper 1 Specimen Latest Update 01 . 1) Describe how you could use cell fractionation to isolate chloroplasts from leaf tissue. [3 marks] - ANSWER-1. How to break open cells and remove debris; 2. Solution is cold/isotonic/buffered; 3. Second pellet is chloroplast; 01 . 2) (Figure 1 shows a photograph of a chloroplast taken with an electron microscope. Figure 1) Name the parts of the chloroplast labelled A

Table 1 shows features of a bacterium and the human immunodeficiency virus (HIV) particle. Complete Table 1 by putting a tick ( ) where a feature is present. [2 marks] Table 1 Feature Bacterium Human immunodeficiency virus (HIV) particle RNA Cell wall Enzyme molecules Capsid 0 1 . 2 When HIV infects a human cell, the following events occur. • A single-stranded length of HIV DNA is made. • The human cell then makes a complementary strand to the HIV DNA. The complementary st...