(a) Rapid spasms in the muscle due to low calcium.
(b) Inflammation of joints.
(c) Autoimmune disorder affecting the neuromuscular junction.
(d) Decreased bone mass and increased chances of bone fractures.
Answer:
(d) Decreased bone mass and increased chances of bone fractures.
Explanation:
Osteoporosis is a skeletal disease characterized by low bone mass and microarchitectural deterioration of bone tissue, greatly increasing bone fragility and fracture risk.
112. The urge for eating and drinking is controlled by which part of the brain?
(a) Cerebrum
(b) Medulla
(c) Hypothalamus
(d) Cerebellum
Answer:
(c) Hypothalamus
Explanation:
The hypothalamus contains crucial control centers governing homeostasis, including the drives to eat (hunger) and drink (thirst).
113. Which of the following RNA polymerases is responsible for the transcription of mRNA ?
(a) RNA Polymerase I
(b) RNA Polymerase II
(c) RNA Polymerase III
(d) Reverse Transcriptase
Answer:
(b) RNA Polymerase II
Explanation:
In eukaryotic cells, RNA Polymerase II is the specific enzyme that catalyzes the transcription of DNA to synthesize precursors of messenger RNA (mRNA).
114. Which of the following is not a component of the Recombinant DNA technology?
(a) Restriction enzymes
(b) DNA ligases
(c) Bacterial Chromosomal DNA
(d) Vectors
Answer:
(c) Bacterial Chromosomal DNA
Explanation:
Recombinant DNA technology primarily utilizes plasmids (vectors), restriction endonucleases, and DNA ligases. The massive bacterial chromosomal DNA itself is generally not the active component manipulated to carry foreign genes.
115. Which taxonomic group is the most species-rich in the animal kingdom ?
(a) Fishes
(b) Insects
(c) Crustaceans
(d) Amphibians
Answer:
(b) Insects
Explanation:
Insects, belonging to the phylum Arthropoda, constitute the largest and most species-rich taxonomic group on Earth, accounting for over 70% of all known animal species.
