The disease caused by the deficiency of thiamine (vitamin B₁) is:
A. Rickets
B. Pellagra
C. Beriberi
D. Scurvy
Answer: Option C
Solution (By JKSSB Mock Tests)
Beriberi results from lack of thiamine (B₁), affecting the nervous and cardiovascular systems. It manifests as dry beriberi (peripheral neuropathy) or wet beriberi (heart failure). Pellagra is niacin deficiency, scurvy vitamin C, rickets vitamin D. Thiamine is a coenzyme in carbohydrate metabolism.
Explanation:
Beriberi involves neurological and cardiovascular symptoms due to thiamine deficiency, common in polished rice diets. Scurvy is vitamin C, pellagra niacin, rickets D.
Explanation:
Resistin is a cysteine-rich peptide hormone secreted primarily by adipose tissue in humans (though in rodents, it is mainly secreted by macrophages). Its name is derived from its proposed role in 'resistance' to insulin. Its primary function is to antagonize the action of insulin, thereby promoting insulin resistance. It does this by increasing hepatic glucose production (gluconeogenesis) and impairing glucose uptake by muscle and adipose tissue. Elevated levels of resistin are associated with obesity and type 2 diabetes, linking adiposity to insulin resistance.
Assertion (A): Fishes are ammonotelic.
Reason (R): Ammonia is highly toxic and requires a large amount of water for excretion, which is available in aquatic environments.
A.A false, R true.
B.Both A and R are true, but R is not the correct explanation.
C.Both A and R are true, and R is the correct explanation.
Explanation:
Ammonotelic organisms excrete ammonia directly into water, which dilutes it. This is feasible for fishes. The reason correctly explains why they are ammonotelic.
No comments yet. Be the first to start the discussion!