Hydrolyse Study guides, Class notes & Summaries
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AQA AS BIOLOGY 7401/2 Paper 2 Version: 1.0 Final *JUN237401201* IB/M/Jun23/E9 7401/2QUESTION PAPER & MARKING SCHEME/ [MERGED] Marl( scheme June 2023
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AQA 
AS 
BIOLOGY 
7401/2 
Paper 2 
Version: 1.0 Final 
*JUN* 
IB/M/Jun23/E9 7401/2 
For Examiner’s Use 
Question Mark 
1 
2 
3 
4 
5 
6 
7 
8 
9 
10 
TOTAL 
Thursday 25 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 question...
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AQA A-Level Biology Paper 1 2023 Q&A
- Exam (elaborations) • 8 pages • 2023
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Describe the role of a ribosome in the production of a polypeptide. /3 - Correct answer1. mRNA binds to ribosome; 
2. Idea of TWO codons/binding sites; 
3. tRNA with ANTICODONS binds; 
4. (Catalyses) formation of PEPTIDE bond between AMINO ACIDS (held by tRNA 
molecules); 
5. Moves along (mRNA to the next 
codon); 
Describe the structure of glycogen. /2 - Correct answer-1. Polysaccharide of α-glucose; 
OR 
polymer of α-glucose; 
2. (Joined by) glycosidic bonds 
OR 
Branched structure; 
NHE3 ac...
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AC Test Wk 1-5 (All Answered Correctly)
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sulfonamide inhibits correct answers dihydropteroate synthase cos it is PABA (p-aminobenzoic acid) analogue 
 
Trimethoprim inhibits ____ 
whats special bout the enzyme? correct answers dihydrofolate reductase 
--in both human and bacteria 
but trimethoprim is more sensitive to bacteria one 
(needs high concentration of drug to inhibit human one) 
 
3 types of functions of selective toxicity correct answers diff in distribution--accummulate more in bacterial cell (tetracycline- bact cell has pu...
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AQA A-level BIOLOGY 7402/2 Paper 2 Question Paper & Mark scheme June 2023 VERIFIED100%.
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AQA A-level BIOLOGY 
7402/2 Paper 2 
Question Paper & Mark 
scheme June 2023 
VERIFIED100%. 
Chemical digestion - -Hydrolyses large, insoluble 
molecules 
What is digestion - -Physical breakdown 
Chemical digestion 
Physical breakdown - --Breakdown of food into 
absorbable nutrients 
- By teeth 
- Stomach muscles 
- increases SA 
What is the importance of digestion? - -Hydrolyses 
large food molecules into smaller molecules 
Which can move across cell membrane 
And be absorbed into the blood 
Oe...
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AS Biology Exam Style questions and answers 2023 with complete solution
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AS Biology Exam Style questions and answers 2023 with complete solution 
 
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 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. [3 marks] 
-complementary nucleotides/ base pairs 
...
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AQA AS BIOLOGY REVIEW TEST
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AQA AS BIOLOGY 
REVIEW TEST 
Monomer - ANSWER One of many small molecules that combine together to form a 
polymer 
Polymer - ANSWER Large molecule made up of many repeating smaller molecules 
(monomers). 
Polymerisation - ANSWER The process of making a polymer 
Condensation - ANSWER Chemical process in which two molecules combine to 
form a more complex one with the elimination of a simple substance, usually water. 
Many biological polymers (e.g. polysaccharides, polypeptides) are formed b...
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AQA A-level BIOLOGY 7402/2 Paper 2 Question Paper & Mark scheme June 2023 VERIFIED100%.
- Exam (elaborations) • 13 pages • 2024
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AQA A-level BIOLOGY 
7402/2 Paper 2 
Question Paper & Mark 
scheme June 2023 
VERIFIED100%. 
Chemical digestion - -Hydrolyses large, insoluble 
molecules 
What is digestion - -Physical breakdown 
Chemical digestion 
Physical breakdown - --Breakdown of food into 
absorbable nutrients 
- By teeth 
- Stomach muscles 
- increases SA 
What is the importance of digestion? - -Hydrolyses 
large food molecules into smaller molecules 
Which can move across cell membrane 
And be absorbed into the blood 
Oe...
-
AQA A-Level Biology. 3.2 – Cells All Answers Correct
- Exam (elaborations) • 30 pages • 2024
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AQA A-Level Biology. 3.2 – Cells All Answers Correct 
Structure of Nucleus. 
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. 
4. Chromosomes: protein-bound, linear DNA. 
5. Nucleolus: small spherical region(s) in nucleoplasm. Manufactures ribosomal RN...
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AQA AS BIOLOGY Paper 2 FOR MAY 2023
- Exam (elaborations) • 40 pages • 2023
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AQA 
 
 
 
 
AS 
BIOLOGY 
Paper 2 
 
Thursday 25 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 the spaces provided. Do not write outside the box around each page or on blank pages. 
•	If you need extra space ...
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Biology_7401 Marking Scheme Paper 1.
- Exam (elaborations) • 15 pages • 2023
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Biology_7401 Marking Scheme Paper 1. 
Question Marking Guidance Mark Comments 
01.1 
Letter Statement 
B; is a monomer in an enzyme’s 
active site 
D; is a monomer in cellulose 
C; is produced during 
photosynthesis and respiration 
B; forms a polymer that gives a 
positive result with a biuret test 
4 
Must be in correct 
order 
01.2 C = 18, H = 32, O = 16; 1 Accept only these 
answers 
01.3 1. Heat with acid and neutralise; 
2. Heat with Benedict's (solution); 
3. Red precipi...
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