The vitamin that is a component of the coenzymes FMN and FAD is:
A. Niacin
B. Riboflavin
C. Pantothenic acid
D. Thiamine
Answer: Option B
Solution (By JKSSB Mock Tests)
Riboflavin (vitamin B₂) is the precursor of flavin mononucleotide (FMN) and flavin adenine dinucleotide (FAD), which are electron carriers in redox reactions. Thiamine is TPP, niacin NAD/NADP, pantothenic acid CoA.
Explanation:
Human somatic cells have 46 chromosomes: 44 autosomes and 2 sex chromosomes (XX or XY). Sperm cells are haploid (n=23), containing 22 autosomes and one sex chromosome (either X or Y). The ovum also has 22 autosomes and one X. Fertilization restores 44 autosomes plus XX or XY. So sperm has 22 autosomes.
Explanation:
Xerophytes (desert plants) have adaptations like thick cuticle, sunken stomata, and reduced leaves to minimize transpiration and conserve water. The reason correctly explains the adaptation.
Explanation:
Alveoli are tiny, thin-walled air sacs surrounded by a network of pulmonary capillaries. Oxygen diffuses from alveolar air into blood, and CO₂ diffuses from blood into alveolar air. Bronchi and bronchioles are air passages, trachea is the windpipe. The large surface area of alveoli (about 70 m²) facilitates efficient gas exchange.
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