4-hydroxy proline is present in
Q. 4-hydroxy proline is present in Collagen Plant cell wall Keratin Both plant cell wall and collagen Answer: Both plant cell wall and collagen
ATP concentration is maintained relatively constant during muscle contraction by
Q. ATP concentration is maintained relatively constant during muscle contraction by increasing the metabolic activity the action of adenylate kinase theaction of creatne phosphokinase all of the above Answer: all of the above
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Lysis of a fibrin clot:
Q. Lysis of a fibrin clot: is an equibrium wwith formation of the clot begins when plasmin binds to the clot requires the hydrolysis of plasminogen into heavy and light chains requires conversion of plasminogen by tissue plasminogen activator Answer: requires conversion of plasminogen by tissue plasminogen activator
When a muscle contracts, the
Q. When a muscle contracts, the Transverse tubules shorten, the myofibrils and sarcoplasmic reticulum close together Thin filaments and thick filaments of the sarcomere shorten Light chains dissociate from the heavy chains of myosin H bands and I bands of the sarcomere shorten because the thin filaments and thick filaments side past each other Answer:
The nerve impulse that initiates muscular contraction
Q. The nerve impulse that initiates muscular contraction begins with the binding of acetyl choline to receptors in the sarcoplasmic reticulum causes both the plasma membrane and the transverse tubules to undergo hyperpolariation causes opening of calcium channels which lead to an increase in calcium contreation within the sarcomere prevents sodium entering the sarcomere Answer:
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Platelet aggregation:
Q. Platelet aggregation: is initiated at the site of an injury by conversion of fibrinogen to fibrin is inhibited in uninjured blood vessels by the secretion of prostacyclin by intact vascular endothelium causes morphological changes and a release of the vasodilator serotonine is inhibited by the release of ADP and thromboxane A2 Answer: is inhibited
The contraluminal plasma membrane of small intestinal epithelial cells contain
Q. The contraluminal plasma membrane of small intestinal epithelial cells contain Disaccharidases Aminopeptidases GLUT 5 Na+/ K+ ATPase Answer: Na+/ K+ ATPase
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Histamine is a potent secretagogue of
Q. Histamine is a potent secretagogue of Amylase by the salivary gland HCI by the stomach Gastrin by the stomach NAHCO3 by the pancreas Answer: HCI by the stomach
Which of the following is a folate analog?
Q. Which of the following is a folate analog? Methotrexate Carnosine Azaserine Aniserine Answer: Methotrexate