Hydrolyse Study guides, Class notes & Summaries

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...

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...

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...

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 ...

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...

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...

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 ...

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...

AQA A LEVEL BIOLOGY Paper 3 MS 2021 S - The Marketplace to Buy and Sell your Study Material Downloaded by: BetterAcademics | Distribution of this document is illegal S - The Marketplace to Buy and Sell your Study Material MARK SCHEME – A-LEVEL BIOLOGY – 7402/3 – JUNE 2021 Downloaded by: BetterAcademics | Distribution of this document is illegal A-level BIOLOGY 7402/3 Paper 3 Mark scheme June 2021 Version: 1.0 Final 2 S - The Marketplace to Buy and Sell your Study Materia...

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 ...