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2024 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 VERIFIED / Biology AQA AS level 7401/1 Paper 1 $21.49   Add to cart

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2024 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 VERIFIED / Biology AQA AS level 7401/1 Paper 1

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2024 AQA AS BIOLOGY 7401/1 Paper 1 Question Paper & Mark scheme (Merged) June 2023 VERIFIED / Biology AQA AS level 7401/1 Paper 1 Describe the induced-fit model of enzyme action - ANSWER-- active site not complementary to/does not fit substrate - Shape of active site changes as enzyme- s...

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  • May 31, 2024
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2024 AQA AS BIOLOGY 7401/1
Paper 1 Question Paper &
Mark scheme (Merged) June
2023 VERIFIED / Biology AQA
AS level 7401/1 Paper 1

, Describe the induced-fit model of enzyme action - ✔✔✔ANSWER--
active site not complementary to/does not fit substrate
- Shape of active site changes as enzyme- substrate complex forms
- Distorting bonds (in substrate leading to reaction)


• 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. -
✔✔✔ANSWER-- there are complementary nucleotides/bases pair
- DNA polymerase used
- Nucleotides join together (to form new strand)/phosphodiester bonds
form;


Contrast the structures of DNA and mRNA molecules to give three
differences. - ✔✔✔ANSWER-- DNA is double stranded/double helix
and mRNA single-stranded;
- DNA (very) long and RNA short;
-Thymine/T in DNA and uracil/U in RNA;
- Deoxyribose in DNA and ribose in RNA;


Describe the difference between the structure of a triglyceride molecule
and the - ✔✔✔ANSWER-In phospholipid, one fatty acid replaced by a
phosphate

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