The protein that polymerizes to form blood clots is:
A. Thrombin
B. Fibrinogen
C. Fibrin
D. Prothrombin
Answer: Option C
Solution (By JKSSB Mock Tests)
Thrombin converts soluble fibrinogen into insoluble fibrin monomers, which polymerize and cross-link to form a stable blood clot. Fibrinogen is the precursor, prothrombin is the precursor of thrombin. The clotting cascade amplifies the signal.
Explanation:
Glucagon is secreted by alpha cells of the islets of Langerhans when blood glucose is low. It acts on the liver to stimulate glycogenolysis (glycogen to glucose) and gluconeogenesis (synthesis of glucose from non-carbohydrates), thereby increasing blood glucose. Insulin, from beta cells, lowers blood glucose. Somatostatin inhibits both.
Explanation:
The '9+2' arrangement refers to nine doublets of microtubules surrounding a central pair, which is the classic axoneme structure of motile cilia and flagella. Centrioles and basal bodies possess a '9+0' arrangement (nine triplets, no central pair). Mitotic spindle fibers are single microtubules, and intermediate filaments lack a tubular microtubule structure entirely.
Explanation:
Iron-deficiency anemia is the most prevalent nutritional deficiency worldwide, characterized by fatigue, pallor, and reduced oxygen-carrying capacity. It is treated with iron supplementation and dietary changes.
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