31. What characteristics do bats and whales share?
[A] mammary glands
[B] placenta
[C] echolocation
[D] all of these
Show Answer
Correct Answer: D [all of these]
Notes:
Bats and whales share mammary glands, placenta, and echolocation features. They both have developed the ability to use echolocation, a biological sonar for hunting.
32. Why is a dolphin is a mammal?
[A] because it breathes through lungs
[B] because has mammary glands
[C] because it does not lay eggs
[D] All of the above
Show Answer
Correct Answer: D [All of the above]
Notes:
Dolphin is a mammal because it breathes through the lungs and has mammary glands. In addition, it does not lay eggs and gives birth to its own young. Dolphins belong to the Cetaceans class of mammalia.
33. The sound receives vibrations and travels to the eardrum, what is it called?
[A] outer ear
[B] middle ear
[C] inner ear
[D] eustachian tube
Show Answer
Correct Answer: A [outer ear]
Notes:
The sound receives vibrations and travels to the eardrum is called the outer ear.
34. Which of the following is a long and complex structure that originates from the glomerulus?
[A] Renal Corpuscle
[B] Renal tubule
[C] Cortical nephron
[D] None of these
Show Answer
Correct Answer: B [Renal tubule]
Notes:
The renal tubule is a long and complex structure that originates from the glomerulus.
35. Which of the following is best maintains intestinal health?
[A] Starches
[B] Vitamins
[C] Fiber
[D] Fat
Show Answer
Correct Answer: C [Fiber]
Notes:
Fiber maintains better intestinal health. Fiber is a type of carbohydrate that the body cannot digest.
36. Which of the following female reproductive organs produces female hormones?
[A] Uterus
[B] Fallopian Tubes
[C] Ovaries
[D] None of these
Show Answer
Correct Answer: C [Ovaries]
Notes:
Ovaries are the female reproductive organs that are responsible for producing various hormones and produce female gametes.
37. Which organ is affected by Japanese encephalitis?
[A] brain and spinal cord
[B] lungs
[C] liver and pancreas
[D] heart
Show Answer
Correct Answer: A [brain and spinal cord]
Notes:
The Brain and spinal cord organs are affected by Japanese encephalitis. This is a viral infection caused by infected mosquitoes in Asia and the western Pacific.
38. Which of the following is an enzyme that cleaves proteins?
[A] protease
[B] RNase
[C] lipase
[D] Dnase
Show Answer
Correct Answer: A [protease]
Notes:
Protease is an enzyme that cleaves proteins. These enzymes are made by animals, plants, fungi, and bacteria.
39. Production of alcohol from organic compounds by microorganisms is known as ____:
[A] Anaerobic respiration
[B] Aerobic respiration
[C] Combustion
[D] Fermentation
Show Answer
Correct Answer: D [Fermentation]
Notes:
The process of breaking down large molecules into simpler one in the presence of enzyme is called fermentation. Alcoholic fermentation is a complex biochemical process during which yeasts convert sugars to ethanol, carbon dioxide, and other metabolic byproducts that contribute to the chemical composition and sensorial properties of the fermented foodstuffs.
40. 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.
