SSCE VCE Biology Biochemical Pathways and Energy Transformations: A group of Biology students set

Question

A group of Biology students set up an experiment with three test tubes. Each test tube contained the same enzyme and was kept under the same experimental conditions. All concentrations and volumes of substrate and enzyme placed in the test tubes were kept the same. The following diagram shows the initial contents of each test tube and the final contents of test tubes 1 and 2.

Test tube 1:
- Enzyme + Substrate A → Enzyme + Product

Test tube 2:
- Enzyme + Substrate B → Enzyme + Substrate B

Test tube 3:
- Enzyme + Substrate A + Substrate B → ?

An enzyme-substrate complex was formed in each of the three test tubes.

When comparing the final contents of Test tube 1, the concentration of product contained in the final contents of Test tube 3 will:

A. be the same because both Substrate A and Substrate B are able to bind to the enzyme at the same time.
B. increase because Substrate A is a substrate that can bind to the enzyme’s active site.
C. decrease due to competitive reversible inhibition by Substrate B.
D. be zero due to the presence of an irreversible inhibitor.

A group of Biology students set up an experiment with three test tubes - VCE - SSCE Biology - Question 4 - 2020 - Paper 1

Worked Solution & Example Answer:A group of Biology students set up an experiment with three test tubes - VCE - SSCE Biology - Question 4 - 2020 - Paper 1

When comparing the final contents of Test tube 1, the concentration of product contained in the final contents of Test tube 3 will:

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