List of top Biology Questions asked in IIT JAM BT

Viral capsids are made up of morphological subunits called capsomers. One of the common capsomeres is icosahedral. The icosahedron is a regular polyhedron with

Match the entries in Group I with that in Group II.
Group I Group II
P) Cholera toxin 1) Endotoxin
Q) Diphtheria toxin 2) Neurotoxin
R) Lipopolysaccharide 3) Enterotoxin
S) Tetanus toxin 4) Cytotoxin

Match the hormones in Group I with their functions in Group II.
Group I Group II
P) Aldosterone 1) Stimulates the synthesis and secretion of androgens from the testes
Q) Luteinizing hormone (LH) 2) Helps in the re-absorption of Na\(^+\) and water from the kidney
R) Atrial natriuretic factor (ANF) 3) Increases the heart rate and the strength of heart contraction
S) Epinephrine 4) Causes dilation of blood vessels and reduction of blood pressure

Match the entries in Group I with that in Group II.
Group I Group II
P) Fehling's test 1) α-Amino acid
Q) Ninhydrin reaction 2) Reducing sugar
R) Biuret reaction 3) Sulfhydryl group
S) Nitropusside reaction 4) Peptide linkage

Match the entries in Group I with that in Group II.
Group I Group II
P) Vitamin B1 \(\hspace{2cm}\) 1) Co-enzyme A
Q) Vitamin B2 \(\hspace{2cm}\) 2) Flavin mononucleotide
R) Vitamin B5 \(\hspace{2cm}\) 3) Pyridoxal phosphate
S) Vitamin B6 \(\hspace{2cm}\) 4) Thiamine pyrophosphate

Antibody binds to antigen in solution through

Plasmid mediated antibiotic resistances in bacteria are acquired by

Which of the following statements is/are CORRECT for G protein–coupled receptor (GPCR) mediated signaling?

Glucose is incubated with enzymes of glycolytic pathway (except pyruvate kinase), gamma \( ^{32}P \)-ATP and unlabeled inorganic phosphate. Which of the following products is/are formed?

In a double stranded DNA, which of the following ratios is/are always equal to 1? A, T, G and C denote the number of bases.

The total number of genetically different types of gametes that will be produced by a heterozygous plant carrying the genotypes AABbCc is ...............

A healthy individual has the cardiac output of 5.5 L and heart rate of 72 beats per minute. The stroke volume of the individual is ........ mL.

Both strands of a DNA molecule are labeled with radioactive thymidine and are allowed to duplicate in an environment containing non-radioactive thymidine. The number of DNA molecules that will contain radioactive thymidine after three duplications is .............

The concentration of a purified enzyme is 10 mg/mL. Ten microlitres of the enzyme solution in a total reaction volume of 1 mL catalyses the formation of 20 nanomoles of product in one minute under optimum conditions. The specific activity of the enzyme is .............. unit/mg.

A 100 nucleotide-long single stranded poly-(A) is synthesized from adenosine monophosphate (AMP) at physiological pH. (Atomic mass of C = 12, H = 1, O = 16, P = 31; at physiological pH, Molecular mass of AMP = 345). The molecular mass of the resulting poly-(A) at physiological pH is ............

If a colour-blind woman marries a normal man, the chance that their boy child will be colour-blind is ........... %.

For a 0.1 M aqueous solution of lysine, the pH at which it carries no net charge is ..........

(pKa values for: α-carboxylic group = 3.1, α-amino group = 8.0, ε-amino group = 10.8)

Proenzyme pepsinogen is secreted from 'P' of gastric mucosa and converted into active enzyme pepsin on exposure to 'Q' secreted from 'R'. Choose the CORRECT combination of P, Q, and R.

The reaction of 11-cis-retinal with the lysine residue of a specific protein forms the light-sensitive pigment in the cells of retina. The light-sensitive pigment is an

Which of the following feature(s) should be present in a protein to generate strong immune response (antibody production) in an animal?
I. At least one B-cell epitope
II. At least one T-cell epitope
III. Proteolytic cleavage site(s)

What is the source of electrons in photosynthesis?