The vitamin that is a coenzyme in the metabolism of carbohydrates and branched-chain amino acids is:
A. Thiamine
B. Niacin
C. Pantothenic acid
D. Riboflavin
Answer: Option A
Solution (By JKSSB Mock Tests)
Thiamine pyrophosphate (TPP) is a coenzyme for pyruvate dehydrogenase, alpha-ketoglutarate dehydrogenase, and transketolase, playing a key role in carbohydrate metabolism. Riboflavin is FAD, niacin NAD, pantothenic acid CoA.
Explanation:
Neurulation involves the folding of the neural plate to form the neural tube, which becomes the brain and spinal cord. Gastrulation forms germ layers.
Explanation:
Carrot and radish are examples of modified taproots where the primary root swells to store food. Prop roots are adventitious (banyan), fibrous roots are fine and branching (grasses), adventitious arise from stems/leaves.
In human genetics, 'Color blindness' is an X-linked recessive trait. If a colorblind man marries a carrier woman, what is the probability that their son will be colorblind?
Explanation:
Color blindness is an X-linked recessive disorder. Let X^c be the colorblind allele and X^C be the normal allele. The colorblind man's genotype is X^cY. The carrier woman's genotype is X^CX^c. When they have children, the sons will receive the Y chromosome from the father and one X chromosome from the mother. The mother can pass either X^C (normal vision) or X^c (colorblind) with equal probability. Therefore, there is a 50% chance (1/2) that a son will inherit X^cY and be colorblind.
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