2023 AQA AS BIOLOGY 7401/2 Paper 2 Question Paper & Mark scheme (Merged) June 2023 [VERIFIED]
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2023 AQA AS BIOLOGY 7401/2 Paper 2 Question Paper
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2023 AQA AS BIOLOGY 7401/2 Paper 2 Question Paper
2023 AQA AS
BIOLOGY 7401/2
Paper 2 Question
Paper & Mark
scheme (Merged)
June 2023
[VERIFIED]
Describe the process of protein
production.ANSWER1) Proteins synthesized on
ribosomes bound to ER
2) Pass into cisternae
3) Packaged in transport vesicles
4) Move to Golgi via cytoskeleton
5) ...
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.
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.
Describe collagen.✔✔✔ANSWER➖Fibrous protein.
3 polypeptides wound in rope-like structure.
Every third amino acid in glycine (small).
R groups in proline and hydroxyproline repel each other.
Describe cartilage.✔✔✔ANSWER➖Connective tissue.
Chondrocyte cells embedded in matrix containing fibres
of elastin and collagen.
, Give all components of lung volume.✔✔✔ANSWER➖1)
Tidal volume
2) Vital capacity
3) Reserve volumes
4) Residual volume
What are "megakaryocytes"?✔✔✔ANSWER➖Platelets
are fragments of large cells called megakaryocytes found
in red bone marrow.
Describe the symplast pathway.
Describe the apoplast
pathway.✔✔✔ANSWER➖Continuous cytoplasm
connected by plasmodesmata.
Movement along cellulose inside cell wall.
What are aerenchyma cells?✔✔✔ANSWER➖Special
parenchyma (packing) cells found in hydrophytes. Has
large air spaces formed by apoptosis of parenchyma.
Define "homologous
structure".✔✔✔ANSWER➖Appears superficially
different and may perform different functions but has
same underlying structure.
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