List of practice Questions

The predominant mechanism of microRNA mediated regulation of gene expression is inhibition of:

In human reproduction, (P) spermatogenesis starts at puberty
(Q) oogenesis starts at fetal stage
(R) following meiosis, one oogonium produces 4 eggs
(S) following meiosis, one spermatogonium produces 4 sperms

3'-Azido-2',3'-dideoxy thymidine (AZT) with the structure shown above has potential to work as a drug against HIV because:
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A bacterium that arose 3.5 billion years ago divides once every 12 hours. Under ideal conditions, the number of generations the bacterium has undergone will be approximately:

A dihybrid phenotypic ratio of 15:1 was obtained while making a cross of AaBb × AaBb. This is an example of:

On infection by a specific virus, a host generates cytotoxic T cells that kill:

Which one of the following combinations showing the chromosome numbers for human cells is CORRECT?

The function \( y = 1 \) is an equation of a:

Bottle X contains 1 L of water, while bottle Y, which has the same capacity as X, is empty. Water is poured from bottle X to Y. The plot of the quantity of water in Y as a function of the quantity of water in X is:

The derivative of \( 2^x \) with respect to \( x \) is:

An example of transcytosis is:

In mammals, which one of the following vitamins is required in amino group transfer reaction?

'Philadelphia chromosome' is NOT linked to

Decreasing the concentration of sodium ions from double stranded DNA solution results in decrease in Tm. This happens because of increased

During pre-mRNA splicing reaction, a lariat RNA is formed when the intron cleaved at the 5' splice site gets linked by a

Match the endocrine gland in Group A with the hormone secreted by them in Group B:
% Table for Groups\[\begin{array}{|c|c|} \hline Group A & Group B \\ \hline \text{(P) Anterior Pituitary} & \text{(i) Melatonin} \\ \hline \text{(Q) Thyroid} & \text{(ii) Glucocorticoids} \\ \hline \text{(R) Adrenal} & \text{(iii) Prolactin} \\ \hline \text{(S) Pineal} & \text{(iv) Calcitonin} \\ \hline \end{array}\]

A plant producing white flower with white seed coat (dominant) was crossed with a plant producing violet flower with gray seed coat (recessive). Upon selfing of 144 F2 progeny plants, the number of plants continuing to produce violet flower with gray seed coat will be:

Which one of the following, involving transfer of a phosphate group, is an example of substrate-level phosphorylation?

Lysosomal targeting of proteins involves recognition of

In vitro, group I introns have the ability to

In polypeptide chains, the proline residue is unique in

Which one of the following microscopes has working principle most similar to the way a blind person reads?

Many plasma glycoproteins are protected from uptake and degradation by the hepatocytes in liver due to the presence of a terminal saccharide moiety known as

One of Koch's postulates states that the suspected causative organism should