GAT-B Practice Quiz

Question 1

In a double-stranded DNA molecule, the number of adenine residues is $240$, and adenine constitutes $30\%$ of the total bases. What is the total number of base pairs in the DNA molecule?

Accepted Answer

$400$

Question 2

During purification of a protein, the following values were obtained: total protein $=200\,\text{mg}$, total enzyme activity $=5000\,\text{units}$. What is the specific activity of the preparation?

Accepted Answer

$25\,\text{units mg}^{-1}$

Question 3

Which one of the following organelles is directly involved in oxidative phosphorylation in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 4

A bacterial culture growing exponentially has a generation time of $30$ minutes. If the initial cell number is $2\times 10^5$, what will be the approximate cell number after $3$ hours, assuming no nutrient limitation?

Accepted Answer

$1.28\times 10^7$

Question 5

In Michaelis-Menten enzyme kinetics, an inhibitor increases the apparent $K_m$ but does not change $V_{\max}$. Which type of inhibition is most consistent with this observation?

Accepted Answer

Competitive inhibition

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