The respiratory pigment in human blood that transports oxygen is:
A. Hemoglobin
B. Cytochrome
C. Hemocyanin
D. Myoglobin
Answer: Option A
Solution (By JKSSB Mock Tests)
Hemoglobin is a red, iron-containing protein in red blood cells (erythrocytes) that reversibly binds oxygen to form oxyhemoglobin. Each molecule has four heme groups, each binding one O₂ molecule. Hemocyanin (copper-based) is found in some invertebrates. Myoglobin stores oxygen in muscles. Cytochromes are electron carriers in respiration. Hemoglobin also transports CO₂ as carbaminohemoglobin.
Explanation:
Malaria is transmitted by Anopheles mosquito; P. falciparum causes severe, often fatal malaria. Amoebic dysentery is Entamoeba, sleeping sickness Trypanosoma, giardiasis Giardia.
Explanation:
Biotin (vitamin B₇) is a water-soluble B vitamin that functions as a coenzyme for carboxylase enzymes, important in fatty acid synthesis and gluconeogenesis. Vitamin B₁ acts in decarboxylation, A and K are fat-soluble. Biotin is widely distributed in foods and also synthesized by gut bacteria.
Explanation:
Emil Fischer proposed the lock-and-key model in 1894 to explain enzyme specificity. Koshland modified it to induced fit. Krebs discovered the citric acid cycle, Mitchell chemiosmosis.
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