Enzyme activity decreases with a change in pH because it results in:

Changes in the amino acids (ionic state) of the enzyme

A non-competitive inhibitor generally binds:

At a site other than the active site

What generally happens to an enzyme at a very high temperature?

It may denature and lose activity

Its activity increases indefinitely

It becomes permanently more active

Its substrate concentration becomes zero

What can happen to enzyme activity when pH changes significantly from its optimum?

Enzyme activity always increases

Substrate concentration becomes zero

The enzyme converts into substrate

Which of the following nitrogenous bases are present in DNA?

Adenine, guanine, cytosine and thymine

Adenine, guanine, uracil and cytosine

Adenine, thymine, uracil and guanine

Cytosine, uracil, thymine and guanine

A test cross is performed primarily to determine:

Whether an organism is homozygous or heterozygous

Whether an organism is dominant or recessive

The phenotype of the offspring only

Expansion and contraction of the lungs are accomplished by:

Diaphragm and intercostal muscles

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MDCAT 2026 · Sindh

MDCAT 2026 Sindh Paper

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