In the dark, rods show a large inward "dark" current which is suppressed by a flash of light. Which one of the following statements, explaining the effect of light, is true?

• Sodium channels in the outer segment of rods are closed.

• Cytoplasmic cGMP concentration increases

• Sodium channels in the inner segment of rods are closed.

• Transducin dissociates from beta-arrestin

During photosynthetic carbon reduction cycle in green leaves, net production of one molecule of glyceraldehyde 3-phosphate requires one of the following combinations of energy equivalents:

• 9 NADPH and 6 ATP

• 3 NADPH and 9 ATP

• 2 NADPH and 3 ATP

• 6 NADPH and 9 ATP

A chromosome aberration leads to change in the order of genes in a genetic map but does not alter its linkage group. This is due to

• translocation

• recombination

• transposition

• inversion

What would be the outcome if the theca interna cells were destroyed in a Graafian follicle?

• Immediate formation of corpus albicans.

• Increased progesterone synthesis in the granulosa cells.

• Decreased estrogen synthesis in the granulosa cells

• Formation of corpus hemorrhagicum.

Which one of the following statements is INCORRECT about the role of oxidative pentose phosphate pathway in plant metabolism?

• Generation of NADPH required to drive biosynthetic reactions.

• Production of pentose phosphate for the synthesis of nucleic acids.

• Formation of erythrose 4-phosphate for biosynthesis of aromatic amino acids.

• Production of NADH to generate ATP

Which one of the following essential micronutrients are associated with urease enzyme found in higher plants?

• Nickel

• Molybdenum

• Zinc

• Copper

The concept of recon was proposed by Seymour Benzer by studying recombination between

• lysis mutants of bacteriophage T4

• white eye mutants of Drosophila melanogaster

• biochemical mutants of Neurospora crassa

• auxotrophic mutants of Escherichia coli

Plants are able to perceive light through various photoreceptors and downstream genes. Which of the following genes is NOT involved in light perception?

• PIF3

• NPR1

• PHY E

• CRY3

The size of red blood cells (RBC) in venous blood is greater than that of arterial blood. This increased size of red blood cell in the venous blood is due to

• the increased permeability of red blood cell (RBC) membrane

• the decreased osmotic pressure in plasma

• the increased osmotic pressure in RBC

• the dissociation of cytoskeletal proteins in RBC

Four groups of mice were studied for the factor required for mast cell generation: IL-3-deficient, GM-CSF-deficient, G-CSF-deficient, and erythropoietin-deficient. In which mice, mast cell generation is most likely to be deficient?

• IL-3-deficient

• GM-CSF-deficient

• G-CSF-deficient

• Erythropoietin-deficient