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15. Thyroxin is the major hormone produced by the thyroid gland. Rats may be thyroidectomised (THX) either surgically or chemically. In an experiment designed to investigate the relationship of the […]

14. How many bacteria were there in the initial 1 ml sample based on the dilution series shown below? The labels below the tube show the amount of liquid before […]

13. Konopka and Benzer isolated mutant fruit flies that had abnormal daily (circadian) rhythms. The graph below shows the number of fruitflies that eclose each hour of the day (eclosion […]

12. The monoamine serotonin is synthesized mainly by enterochromaffin cells in the intestine. A mouse was treated with broad range of antibiotics for a week. After a week, both the […]

11. The poison dart frog, or poison arrow frog in the family Dendrobatidae carry Batrachotoxin, among other agents. The toxin irreversibly binds to voltage-gated sodium channels and keeps them open. […]

10. Which one of the following cannot form a bilayer by itself? a. Glycerophospholipids b. Cholesterol c. Phosphatidic acid d. Glycerolipids Cholesterol cannot form a bilayer by itself. This makes it […]

9. Human red blood cells (RBCs) cannot be grown in cultures because a. RBCs require a steady oxygen supply b. RBCs are extremely fragile c. RBCs are terminally differentiated cells […]

8. Galvani discovered in the 1700s that frog’s legs jerked when touched with a piece of copper and a piece of iron, simultaneously. This happens because action potentials are triggered […]

7. Of the graphs shown below, which is most representative of the kinetics of ion transport through a membrane channel? a. Graph (A) b. Graph (B) c. Graph (C) d. […]