Q. The characteristic strong absorbance of 280nm of proteins is due to All amino acids can absorb at 280nmOnly Tryptophan and tyrosine can absorb at 280 nmTryptophan is responsible for the absorbanceTryptophan, tyrosine and phenylalanine can absorb at 280 nm Answer: Tryptophan, tyrosine and ...

Q. All the following statements are true except Ornithine and citrulline are uncommon aminoacidsOrnithine is an intermediates in Urea cycleOrmithine and citrulline are uncommon amino acids present in many proteinsBoth ornithine and citrulline are intermediates in urea cycle Answer: Ormithine ...

Q. Tri-peptide consists 3 amino acids and 3 peptide bonds2 amino acids and 3 peptide bonds3 amino acids and 2 peptide bonds3 amino acids and 4 peptide bonds Answer: 3 amino acids and 2 peptide bonds

Q. Peptide bonds between amino acids are highly stable and have a half-life of seven years in intracellular condition. This is due to High activation energy required for hydrolysisLow activation energy required for hydrolysisPeptide bond is a covalent bondPeptide bond is rigid and planar ...

Q. 4-hydroxy proline is present in CollagenPlant cell wallKeratinBoth plant cell wall and collagen Answer: Both plant cell wall and collagen

Q. ATP concentration is maintained relatively constant during muscle contraction by increasing the metabolic activitythe action of adenylate kinasetheaction of creatne phosphokinaseall of the above Answer: all of the above

Q. Lysis of a fibrin clot: is an equibrium wwith formation of the clotbegins when plasmin binds to the clotrequires the hydrolysis of plasminogen into heavy and light chainsrequires conversion of plasminogen by tissue plasminogen activator Answer: requires conversion of plasminogen by tissue ...

Q. When a muscle contracts, the Transverse tubules shorten, the myofibrils and sarcoplasmic reticulum close togetherThin filaments and thick filaments of the sarcomere shortenLight chains dissociate from the heavy chains of myosinH bands and I bands of the sarcomere shorten because the thin ...

Q. The nerve impulse that initiates muscular contraction begins with the binding of acetyl choline to receptors in the sarcoplasmic reticulumcauses both the plasma membrane and the transverse tubules to undergo hyperpolariationcauses opening of calcium channels which lead to an increase in ...

The cones of the retina:

Q. Platelet aggregation: is initiated at the site of an injury by conversion of fibrinogen to fibrinis inhibited in uninjured blood vessels by the secretion of prostacyclin by intact vascular endotheliumcauses morphological changes and a release of the vasodilator serotonineis inhibited by the ...

Q. The contraluminal plasma membrane of small intestinal epithelial cells contain DisaccharidasesAminopeptidasesGLUT 5Na+/ K+ ATPase Answer: Na+/ K+ ATPase