Question

Which statements about isozymes are true? Isozymes catalyze different reactions. Isozymes have identical kinetic properties. Isozymes are present in various developmental stages. Isozymes are encoded by the same gene. Lactate dehydrogenase is an example. Isozymes have different amino acid sequences.

Answer 1

Isozymes are present in various developmental stages.

Lactate dehydrogenase is an example.

Isozymes have different amino acid sequences.

Step-by-step explanation:

Hello,

Isozymes or isoenzymes, are types of enzymes that have quite different amino acid sequences even when they catalyze the same biochemical reaction. Such enzymes display different kinetic parameters, like Km (Michaelis kinetic constant), or different properties towards regulation. They are encoded by different genetic loci, characterized by gene duplication and divergence. In addition, their presence promote the fine-tuning of metabolism during a specific developmental stage. An example of isozymes is the lactate dehydrogenase which catalyzes the conversion of lactate to pyruvate and back, as it converts NAD+ to NADH and back, moreover, it is a tetramer constituted by two forms, the H-form and the M-form.

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Answer 2

The correct statements are listed below

Step-by-step explanation:

1 Isozymes have identical kinetic properties.

2 Isozymes are encoded by the same gene.

3 Lactate dehydrogenase is an isozyme.

4 Isozymes have different amino acid sequence.