31. What is the scrotal ligament?
[A] an accessory reproductive gland in male mammals
[B] elastic tissue which connects the cauda epididymis to the scrotal sac
[C] remnant of gubernaculum in a fetus
[D] None of these
Show Answer
Correct Answer: C [remnant of gubernaculum in a fetus]
Notes:
A scrotal ligament is the remnant of the gubernaculum in a fetus. It secures the testis to the most inferior portion of the scrotum.
32. Which of the following is not a Degenerative disease?
[A] Hypertension
[B] Atherosclerosis
[C] Obesity
[D] Alzheimer’s disease
Show Answer
Correct Answer: C [Obesity]
Notes:
Obesity is not a Degenerative disease. Degenerative diseases are those diseases, which occur due to aging and result in malfunction or deficiency.
33. Which chemical is used to obtain a precipitate of pure DNA?
[A] Methanol
[B] Ether
[C] HCl
[D] Ethanol
Show Answer
Correct Answer: D [Ethanol]
Notes:
Ethanol is used to obtain a precipitate of pure DNA. Renewable fuel made from corn and other plant materials is called ethanol.
34. ____ being a higher category, is the assemblage of families which exhibit a few similar characters:
[A] Class
[B] Species
[C] Genus
[D] Order
Show Answer
Correct Answer: D [Order]
Notes:
Order is an assemblage of families which exhibit a few similar characters. The similar characters are less in number as compared to different genera included in a family. A class includes one or more orders.
35. Tendons and ligaments are
____:
[A] Connective tissue
[B] Muscular tissue
[C] Epithelial tissue
[D] Skeletal tissue
Show Answer
Correct Answer: A [Connective tissue]
Notes:
A tendon is a fibrous connective tissue which attaches muscle to bone. A ligament is a fibrous connective tissue which attaches bone to bone, and usually serves to hold structures together and keep them stable.
36. The hydrophilic nature of DNA is due to the presence of ____:
[A] A number of hydrogen bonds
[B] Phosphate group
[C] Thymine base
[D] Deoxyribose sugar
Show Answer
Correct Answer: A [A number of hydrogen bonds]
Notes:
The phosphate groups on DNA are ionic and charged. Each phosphate group on the DNA backbone has one unit of negative charge (-1). Charged molecules attract water and are hydrophilic. DNA has two hydrophilic polar external backbones made of sugars and phosphate groups joined by ester bonds. Therefore, DNA as nucleic acid is characterized by presence of phosphodiester bond.
37. The radioactive Strontium-90 causes _____:
[A] Lung cancer
[B] Skin cancer
[C] Bone cancer
[D] Brain cancer
Show Answer
Correct Answer: B [Skin cancer]
Notes:
Strontium-90 is a radioactive isotope of strontium produced by nuclear fission. Used mostly in weapons and nuclear power plants, poisoning usually occurs through accidental ingestion. Studies have also linked strontium-90 to various forms of skin cancer.
38. Which chromosomal combination is responsible for maleness in man?
[A] XO
[B] XXX
[C] XX
[D] XY
Show Answer
Correct Answer: D [XY]
Notes:
The chromosomes which determine the sex (maleness or femaleness) of an individual in sexually producing organisms are called sex chromosomes or allosomes. In humans an individual whose cells contain XX chromosomes (homo or isogametic) becomes a female, while one whose cells contains XY chromosomes (heterogametic) becomes a male.
39. Which mosquito is the carrier of Zika virus?
[A] Culex
[B] Aedes
[C] Anopheles
[D] Culiseta
Show Answer
Correct Answer: B [Aedes]
Notes:
Zika virus (ZIKV) is a member of the virus family Flaviviridae. It is spread by daytime-active Aedes mosquitoes, such as A. aegypti and A. albopictus. Its name comes from the Zika Forest of Uganda, where the virus was first isolated in 1947. Zika virus is related to the dengue, yellow fever, Japanese encephalitis, and West Nile viruses.
40. Which of the following is the basic characteristic of a living organism?
[A] Ability to breathe
[B] Ability to reproduce
[C] Ability to move
[D] Ability to eat
Show Answer
Correct Answer: A [Ability to breathe]
Notes:
Living beings are systems or organisms that tend to respond for changes in their environment and inside themselves, in such a way as to promote their own continuation and longevity. They have the ability to breathe or respire, move or navigate and the ability to multiply. Living organisms include human beings, plants, insects, animals among others.
