31. 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.
32. What is fertilization?
[A] Release of egg from the ovary
[B] Release of sperm from testis
[C] Mixing of semen with vaginal fluid
[D] Fusion of sperm with egg nuclei
Show Answer
Correct Answer: D [Fusion of sperm with egg nuclei]
Notes:
The release of an egg from the ovary is called Ovulation. Sperm is the release of sperm from the testis. Conception is the release of semen into the vagina. Fertilization is the process that leads to the fusion of male and female gametes.
33. Listeriosis is a serious infection caused by __
[A] Listeria pestis
[B] Listeria monocytogenes
[C] Listeria papillomavirus
[D] None of these
Show Answer
Correct Answer: B [Listeria monocytogenes]
Notes:
Listeriosis is a serious infection caused by Listeria monocytogenes. It is caused by eating food contaminated with the bacterium Listeria monocytogenes.
34. Which of the following is a sexually transmitted infection (STI) caused by bacteria called Neisseria gonococcus?
[A] Gonorrhoea
[B] Syphilis
[C] AIDS
[D] Genital herpes
Show Answer
Correct Answer: A [Gonorrhoea]
Notes:
Gonorrhea is a sexually transmitted infection caused by a bacteria called Neisseria gonorrhoeae or gonococcus.
35. Which is the best example of incomplete dominance?
[A] Wavy hair
[B] Sickle cell anemia
[C] Tay Sachs disease
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Wavy hair, Sickle cell anemia, and Tay Sachs disease are the best example of incomplete dominance.
36. Which of the following is an example of a loose association of nitrogen-fixing bacteria?
[A] Rhizobium
[B] Blue-Green algae
[C] Azotobacter
[D] Azospirillum
Show Answer
Correct Answer: D [Azospirillum]
Notes:
Azospirillum is an example of a loose association of nitrogen-fixing bacteria. Azotobacter is an example of Free-Living Nitrogen-Fixing Bacteria. Rhizobium is an example of Symbiotic Nitrogen-Fixing Bacteria. Blue-Green alga is an example of Symbiotic Nitrogen-Fixing Cyanobacteria.
37. Which organism’s plasmid was first used to construct recombinant DNA?
[A] Cyanobacteria
[B] Bacillus subtilis
[C] Saccharomyces cerevisiae
[D] Salmonella typhimurium
Show Answer
Correct Answer: B [Bacillus subtilis]
Notes:
Bacillus subtilis organism’s plasmid was first used to construct recombinant DNA.
38. Vitamin C is also known as _____:
[A] Tartaric acid
[B] Acetic acid
[C] Ascorbic acid
[D] Malic acid
Show Answer
Correct Answer: C [Ascorbic acid]
Notes:
Vitamin C is also known as ascorbic acid (C6H8O6). It is a water-soluble vitamin that occurs as a white or slightly yellow crystal or powder with a slight acidic taste. Ascorbic acid is an essential nutrient in human diets, and necessary to maintain connective tissue and bone.
39. What causes the mottling of the dental enamel?
[A] High levels of chlorine in water
[B] High levels of nitrate in the water
[C] High levels of fluorides in the water
[D] High levels of calcium in the water
Show Answer
Correct Answer: C [High levels of fluorides in the water]
Notes:
The mottling of dental enamel is an extremely common disorder, characterized by hypomineralization of tooth enamel caused by ingestion of excessive fluoride during enamel formation. It is also known as dental fluorosis. Common causes of fluorosis include: fluoridated drinking water (particularly during infancy), ingestion of fluoride toothpaste, use of fluoride tablets, and consumption of processed foods made with fluoridated water.
40. The connective tissue that connects a muscle to a bone is _____:
[A] Cartilage
[B] Ligament
[C] Interstitial fluid
[D] Tendon
Show Answer
Correct Answer: D [Tendon]
Notes:
A tendon or sinew is a tough band of fibrous connective tissue that usually connects muscle to bone and is capable of withstanding tension. Tendons are similar to ligaments; both are made of collagen. Ligaments join one bone to another bone, while tendons connect muscle to bone.
