List of top Zoology Questions

Correct sequence of events in cytosolic pathway of antigen presentation:

Choose the correct sequence of enzymes involved in the preparatory phase of glycolysis:

Correct sequence of embryonic developmental stages:

Correctly arrange the below given Transcription Factors (TFs) as per their involvement in initiation of eukaryotic transcription:

True statements about collagen: A. Triple-stranded helical structure
B. Repeating tripeptide Gly-X-Y
C. ‘a chains' are right-handed helix
D. Glycine permits sharp twisting
E. Ascorbic acid is required for proline hydroxylation

Choose the correct sequence of events involved in the synthesis of a secretory protein:

Choose the correct sequence of events involved in receptor-mediated endocytosis of transferrin:

Assertion (A): Molecular evidence suggests the sister group of sponges is Mesomycetozoa, not choanoflagellates. Reason (R): Sponge collar cells resemble choanoflagellates, suggesting a common ancestor.

Assertion (A): The transcripts of RNA polymerases I and III are not processed. Reason (R): RNA polymerases I and III lack a C-terminal domain (CTD).

Assertion (A): Lack of insulin or thyroid hormone increases blood cholesterol, whereas excess thyroid hormone decreases it. Reason (R): These effects are probably caused by changes in the degree of activation of specific enzymes responsible for the metabolism of lipid substances.

Assertion (A): Isoelectric focusing (IEF) is a highly sensitive analytical technique particularly useful for studying micro-heterogeneity in a protein. Reason (R): A protein may show a single band on SDS gel, but three bands on an IEF gel. The method is useful for separating isoenzymes.

Assertion (A): Scleroderma is a systemic autoimmune disease. Reason (R): In Scleroderma, immune response is directed toward nuclei, heart, lungs, kidney and gastrointestinal tract.

Assertion (A): A character showing continuous variation has an unbroken range of phenotypes in a population. Reason (R): Differences are caused by allelic variation in one or many genes, while in some cases, all variation is environmental and has no genetic basis.

Assertion (A): The two alleles of a gene segregate from each other into the gametes; so half the gametes carry one allele of the pair and the other half carry the other allele. Reason (R): The union of one gamete from each parent to form the zygote is random.

Below given structure is of:

All glycosaminoglycans (GAGs) are covalently attached to protein as proteoglycans, except

Assertion (A): Innate immunity includes built-in molecular and cellular mechanisms that are encoded in the germline and are evolutionarily more primitive. Reason (R): Immune responses by B and T lymphocytes are much more attuned to subtle molecular differences and more antigen-specific.

Which structure in the avian embryo is analogous to the dorsal lip of blastopore of the amphibian:

Given below are two statements: Assertion (A): Caveolae are enriched in cholesterol and glycerophospholipids. Reason (R): Caveolin binds cholesterol in the membrane and forces the associated lipid bilayer to curve inward to form caveolae.

Campaniform sensillae, present on the joints of maxillary palps and legs of Cockroach, which perceives strain during feeding and movement is called as:

Which of the following techniques is used for introducing foreign genes into the genome of an organism?

Origin of Notochord is:

The activity of which enzyme is not ATP-dependent:

Which of the following is a stop codon:

The frequency distribution of heritable traits can be altered by natural selection in the following ways except: