31. What is the number of autosomes in a human primary sperm cell?
[A] 46
[B] 44
[C] 23
[D] 22
Show Answer
Correct Answer: B [44]
Notes:
44 is the number of autosomes in a human primary sperm cell. An autosome is a chromosome, which is not a sex chromosome.
32. What of the following is not a reproduction-related problem?
[A] STDs
[B] Abortion
[C] Global warming
[D] Infertility
Show Answer
Correct Answer: C [Global warming]
Notes:
Global warming is an environmental-related problem. Whereas STDs, Abortion, and Infertility are reproduction-related problems.
33. The point mutation results in a change in the codon, which then codes for another amino acid is called __
[A] Silent mutation
[B] Nonsense mutation
[C] Missense mutation
[D] None of these
Show Answer
Correct Answer: C [Missense mutation]
Notes:
The point mutation results in a change in the codon, which then codes for another amino acid is called Missense mutation.
34. Sugar crops to produce __
[A] biomethane
[B] bioethanol
[C] biobutanol
[D] None of these
Show Answer
Correct Answer: B [bioethanol]
Notes:
Bioethanol is produced by fermentation of residues from corn, potatoes, cereals, sugar beets, sugarcane and vegetables.
35. Transgenic plants have desirable traits like __
[A] harmful genes
[B] herbicide resistance
[C] lactose intolerance
[D] complementary genes
Show Answer
Correct Answer: B [herbicide resistance]
Notes:
Transgenic plants have desirable traits like herbicide resistance. The inherited ability of an individual plant to survive the application of a herbicide that would kill a general population of the same species is called herbicide resistance.
36. Epidermal cells of which part of plant often secrete a waxy water resistant layer on their outer surface?
[A] Aerial parts only
[B] Roots only
[C] Both aerial parts and roots
[D] Neither aerial parts nor roots
Show Answer
Correct Answer: A [Aerial parts only]
Notes:
The major role of epidermis is to protect all the parts of the plant. Epidermal cells on the aerial parts of the plant often secrete a waxy, water-resistant layer on their outer surface. This aids in protection against loss of water, mechanical injury and invasion by parasitic fungi.
37. Jaundice is a symptom of disease of
____:
[A] Kidney
[B] Liver
[C] Pancreas
[D] Thyroid
Show Answer
Correct Answer: B [Liver]
Notes:
Jaundice is a yellowish pigmentation of the skin, the conjunctival membranes over the sclerae (whites of the eyes), and other mucous membranes caused by hyperbilirubinemia. Concentration of bilirubin in blood plasma does not normally exceed 1 mg/dL (>17?mol/L). A concentration higher than 1.8 mg/ dL (>30?mol/L) leads to jaundice. Jaundice is often seen in liver disease such as hepatitis or liver cancer.
38. Which of the following is not a connective tissue?
[A] Cardiac Muscle
[B] Areolar Tissue
[C] Compact Bone
[D] Adipose Tissue
Show Answer
Correct Answer: A [Cardiac Muscle]
Notes:
Connective tissue is a group of tissues in the body that maintain the form of the body and its organs and provide cohesion and internal support. Bone, ligaments, tendons, cartilage, and adipose (fat) tissue are examples of connective tissue. Cardiac muscle is an example of muscle tissue. It is so named because it is found in the heart.
39. The Bacille Calmette-Guerin vaccine (popularly called BCG vaccine) is a vaccine to prevent which of these diseases?
[A] Polio
[B] Jaundice
[C] Tuberculosis
[D] Typhoid
Show Answer
Correct Answer: C [Tuberculosis]
Notes:
The Bacillus Calmette–Guérin (BCG) vaccine is used to prevent tuberculosis (TB). The BCG vaccine is named after Dr Albert Calmette and Dr Camille Guerin, who developed the vaccine from a germ called Mycobacterium bovis, which is similar to TB. BCG is a live vaccine that has been processed so that it is not harmful to humans. Tuberculosis is an infectious disease caused by bacteria that affects the lungs, and sometimes other parts of the body.
40. Which of the following is/are agent(s) of infection?
[A] Physical contact
[B] Water
[C] Vectors
[D] All of the above
Show Answer
Correct Answer: D [All of the above ]
Notes:
Infection is the invasion of an organism’s body tissues by disease-causing agents, their multiplication, and the reaction of host tissues to the infectious agents and the toxins they produce. Infectious diseases can be spread from one person to another, for example through contact with bodily fluids, by aerosols (through coughing and sneezing), or via a vector, for example a mosquito.
