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Biology AQA AS level 7401/1 Paper
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Biology AQA AS level 7401/1 Paper 1 • 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. - Correct Answer - there are complementary nucleotides/bases pair - DNA polymerase used - Nucleotides join together (to form new strand)/phosphodiester bonds form; Contrast the structures of...
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AQA A-level Biology Paper 1 2021 FF
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AQA A-level Biology Paper 1 2021 FF Explain the advantage for larger animals of having a specialised system that facilitates oxygen uptake. x2 - Correct Answer 1- lower surface area to volume ratio 2- overcomes large diffusion distance Suggest how the environmental conditions have resulted in adaptations of systems using Model A rather than Model B. x2 - Correct Answer 1- there's a lower concentration of oxygen in the water 2- provides a larger surface area Suggest 2 ways the ...
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AQA A Level Biology 2021 assessment materials - Biological Molecules / Cells
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AQA A Level Biology 2021 assessment materials - Biological Molecules / Cells Describe the chemical reactions involved in the conversion of polymers to monomers and monomers to polymers Give TWO named examples of polymers and their associated monomers to illustrate your answer - Correct Answer 1. A condensation reaction joins monomers together and forms a (chemical) bond and releases water 2. A hydrolysis reaction breaks the (chemical) bond between monomers and uses water 3 and 4. 2 suitable...
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AQA AS Biology Paper 1 Exam Questions with correct answers 100%
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AQA AS Biology Paper 1 Exam Questions with correct answers 100% Describe a biochemical test to show that raffinose solution contains a non-reducing sugar. - Correct Answer First heat the sample with an acid in a water bath and neutralise, then heat with Benedict solution in a water bath for five minutes. A positive test should produce a red precipitate. Explain the arrangement of phospholipids in a cell-surface membrane. - Correct Answer Phospholipids are arranged in a phospholipid bilayer...
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bio as 2021 paper 1 with correct answers 100%
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bio as 2021 paper 1 with correct answers 100% Q1.1) Name the type of bond between: a) complementary base pairs b) adjacent nucleotides in a DNA strand - Correct Answer 1. Hydrogen (bonds); 2. Phosphodiester (bonds); Q1.3) Describe two differences between the structure of a tRNA molecule and the structure of an mRNA molecule. (2) - Correct Answer 1. tRNA is 'clover leaf shape', mRNA is linear; 2. tRNA has hydrogen bonds, mRNA does not; 3. tRNA has an amino acid binding site, m...
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A-level Biology Paper 1 2021 with correct answers 100% 2025
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A-level Biology Paper 1 2021 with correct answers 100% 2025 Suggest and explain a procedure the scientists could've used to stop each reaction - Correct Answer - boil - denatures the enzyme Explain the change in ATP concentration with increasing inorganic phosphate concentration - Correct Answer Increasing Pi concentration means more E-S complexes can be formed At 40dm-3 active sites are all occupied Suggest how the environmental conditions have resulted in the adaptions of systems...
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AS Biology Paper 1 2021 with correct answers 100%
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AS Biology Paper 1 2021 with correct answers 100% Question 1.2 - Correct Answer 1489 method (4.38x10^3 / 5) x 1.7= 1489 Two differences between tRNA and mRNA structure - Correct Answer tRNA has amino acid binding site, mRNA doesn't tRNA has anticodon, mRNA has codon Difference in mRNA and pre-mRNA - Correct Answer mRNA has fewer nucleotides due to splicing Structures A and B of HIV - Correct Answer A= Attatchment protein B= capsid How HIV is replicated - Correct Answer A...
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AQA A-Level Biology: Paper 1 2021 with correct answers 100%
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AQA A-Level Biology: Paper 1 2021 with correct answers 100% 1.1 Describe the induced fit model of enzyme action and how an enzyme acts as a catalyst. - Correct Answer - The substrate binds to the active site and forms an ES complex. - The active site changes shape slightly so it's complimentary to the substrate. - This reduces the activation energy. 1.2 Tick one box to show which are the substrate the scientists must add to the reaction mixture is to produce ATP. - Correct Answer - Ad...
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