The condition caused by insufficient secretion of thyroxine in adults is:
A. Cretinism
B. Goiter
C. Acromegaly
D. Myxedema
Answer: Option D
Solution (By JKSSB Mock Tests)
Hypothyroidism in adults causes myxedema, characterized by puffy face, edema, lethargy, weight gain, and mental dullness. Goiter is an enlarged thyroid due to iodine deficiency but thyroxine may be normal or low. Cretinism is congenital hypothyroidism causing stunted growth and mental retardation. Acromegaly is due to excess growth hormone in adults.
Explanation:
Hexokinase phosphorylates glucose to glucose-6-phosphate using ATP, the first step of glycolysis. Phosphofructokinase is the third step, pyruvate kinase the last, glucose-6-phosphatase reverses the reaction in gluconeogenesis.
Explanation:
The pupil is the opening in the center of the iris whose size is adjusted by the iris muscles to control the amount of light entering the eye. The cornea and lens focus light, the retina senses it. In bright light, the pupil constricts; in dim light, it dilates.
Explanation:
The Haber-Bosch process synthesizes ammonia from N₂ and H₂ under high temperature and pressure with a catalyst. It is the main industrial nitrogen fixation for fertilizers. Biological fixation is by microbes.
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