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2023 AQA AS BIOLOGY 7401/2 Paper 2 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED]

2023 AQA AS BIOLOGY 7401/2 Paper 2 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED]

2023 AQA AS
BIOLOGY 7401/2
Paper 2 Question
Paper & Mark
scheme (Merged)
June 2023
[VERIFIED]
Describe the process of protein
production.✔✔✔ANSWER➖1) Proteins synthesized on
ribosomes bound to ER
2) Pass into cisternae
3) Packaged in transport vesicles
4) Move to Golgi via cytoskeleton
5) Fuse with cis face
6) Modified
7) Leave through trans face
Describe
microFILAMENTS.✔✔✔ANSWER➖Contractile fibres
formed from actin.
Responsible for cell movement and contraction.
Describe microTUBULES.✔✔✔ANSWER➖Globular
tubulin proteins.
Scaffolding for cytoplasmic streaming.
Describe INTERMEDIATE
fibres.✔✔✔ANSWER➖Give mechanical strength.
Give details of precursor
enzymes.✔✔✔ANSWER➖apoenzyme + activator =
holoenzyme
"proenzyme": precursor activated by change in conditions
Describe the process of active
transport.✔✔✔ANSWER➖1) Molecule binds to
receptors in carrier protein on outside
2) ATP binds to carrier on inside
3) ATP hydrolyzed to form ADP and phosphate
4) Phosphate changes shape of carrier
Describe keratin.✔✔✔ANSWER➖Fibrous protein.
Large proportion of cysteine (containing sulfur).
Many strong disulfide bridges.
Describe elastin.✔✔✔ANSWER➖Fibrous protein in
elastic fibres.
Quaternary.
Made of small, soluble tropoelastin molecules linked
together via interactions between hydrophobic areas.
Alternate hydrophobic and lysine-rich areas.
Cross-linking covalent bonds between lysine

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