1. Calcitriol is the biologically active form of which among the following Vitamins?
[A] Vitamin B
[B] Vitamin C
[C] Vitamin D
[D] Vitamin E
Show Answer
Correct Answer: C [Vitamin D]
Notes:
Calcitriol is the biologically active form of Vitamin D. It is normally made in the kidney. It is used to treat diseases like hypoparathyroidism, osteoporosis, osteomalacia, and familial hypophosphatemia.
2. Which among the following hormone can be used as a drug to treat cardiac arrest and some other cardiac problems?
[A] Thyroxin
[B] Epinephrine
[C] Calcitonin
[D] Insulin
Show Answer
Correct Answer: B [Epinephrine]
Notes:
Epinephrine which is also known as adrenaline, is a medication and hormone. It is used to treat a number of conditions, including cardiac arrest, anaphylaxis, , asthma, and superficial bleeding.
3. How many pairs of ribs are there in a human body?
[A] 10 pairs
[B] 12 pairs
[C] 14 pairs
[D] 16 pairs
Show Answer
Correct Answer: B [12 pairs]
Notes:
There are total 24 ribs (12 pairs), out of which 14 (7 pairs) are true ribs
4. Calorie of Energy is equal to _________?
[A] .42 joule
[B] 4.2 joule
[C] 42 joule
[D] 0.042 Joule
Show Answer
Correct Answer: B [4.2 joule]
Notes:
The calorie is a unit of energy widely used in nutrition. The small calorie or gram calorie is the amount of heat energy needed to raise the temperature of one gram of water by one degree Celsius.
5. The enzyme Nitrite reductase has which of the elements as its constituent ?
[A] Molybdenum
[B] Copper
[C] Iron
[D] Zinc
Show Answer
Correct Answer: A [Molybdenum]
Notes:
Nitrite reductase refers to any of several classes of enzymes that catalyze the reduction of nitrite. They are enzymes that catalyze reduction of nitrate to nitrite using a molybdenum cofactor.
6. Calcium is required in plants in the formation of which of the following ?
[A] Cell Membrane
[B] Cell wall
[C] Cholorophyll
[D] None of the above
Show Answer
Correct Answer: B [Cell wall]
Notes:
Calcium is required in plants in the formation of cell wall. It is a structural layer surrounding some types of cells, just outside the cell membrane. The cell wall can be tough, flexible, and sometimes rigid also.
7. What would happen if red blood cells were placed in distilled water?
[A] They would shrink and collapse
[B] They would stick together
[C] They would increase in volume and burst
[D] They would remain the same
Show Answer
Correct Answer: C [They would increase in volume and burst]
Notes:
When red blood cells are placed in distilled water, the water molecules move into the cells by osmosis because the cells have a higher solute concentration than the distilled water. This influx of water causes the red blood cells to swell and eventually burst in a process known as hemolysis. This demonstrates how osmosis, a vital biological process, can result in cell damage when the external conditions are not balanced.
8. Which among the following is not a function of Sympathetic nerves in Autonomic nervous system?
[A] Enhancing the heart beats
[B] constricting the blood vessels
[C] dilate pupils
[D] contract urinary bladder
Show Answer
Correct Answer: D [contract urinary bladder]
Notes:
contract urinary bladder is a function of Parasympathetic nerves. Sympathetic nerves relax urinary bladder.
9. Which of the following is the name given to the population of cells derived from a single parent cell? (UPSC Prelims 1989)
[A] Haploid
[B] Diploid
[C] Symmetrical cell
[D] Clone
Show Answer
Correct Answer: D [Clone]
Notes:
Under suitable conditions, a single cell grows into a colony of cells on agar medium. The resulting population of genetically identical cells derived from a single parent cell is called a clone.
10. Consider the following conditions of sick human body
1. Swollen lymph nodes
2. Sweating at night
3. Loss of memory
4. Loss of weight
Which of these are the symptoms of AIDS? (UPSC Prelims 2003)
[A] 1 and 2
[B] 2, 3 and 4
[C] 1, 2 and 3
[D] 1, 2, 3 and 4
Show Answer
Correct Answer: D [1, 2, 3 and 4]
Notes:
AIDS is a viral disease. In this disease the immune system weakens and the body becomes prone to different type of infection by pathogens. Sweating at night, swollen lymph nodes, loss of memory and loss of weight are also symptoms of AIDS.
