LIFE SCIENCE PART C (JUNE 2018) 2018

Following are structures of stereoisomers of aldohexoses which differ in the stereochemistry based on above structures, following information was given below:1) D-glucose and D-mannose are epimers because they differ in the stereochemistry at C-2 position.2) D-glucose and D-galactose are epimers because they differ in the stereochemistry at C-4 position.3) D-mannose and D-glucose are epimers because they differ in the stereochemistry at C-3 position.4) D-galactose and D-glucose are epimers because they differ in the stereochemistry at C-5 position.Choose one of the correct combinations of above statements:

Following statements are made related to protein structure1) The hydrogen bonding patterns between the CO and NH groups are n → n + 3 in α-helix; n → n + 4 in 310 helix and n → n + 5 in π helix.2) In a β turn, there are 10 atoms between the hydrogen bond donor and acceptor.3) In a ϒ turn, there are 6 atoms between the hydrogen bond donor and acceptor.4) Parallel sheets have evenly spaced hydrogen bonds, which bridge the strands at an angle.Which one of the following combinations of above statements is correct?

The following statements are made on nucleic acid structure:1) A In the B-form of DNA, the sugar pucker is C2' endo.2) In RNA, the sugar pucker is C3' exo.3) The wobble base pair is formed between G and A in RNA4) A change in the sugar pucker from C2' endo in the B form of DNA to C3' endo alters the width and depth of the major groove.Which one of the following combinations of above statements is correct?

The Vmax and Km from a Lineweaver-Burk plot of an enzyme reaction where = 40 µM-1 min at = 0 and = -1.5 × 102 mM-1 at = 0 are

From the following statements:1) Biosynthesis of proteins and nucleic acids from precursors results in production of chemical energy in the form of ATP, NADH, NADPH, and FADH2,2) The spontaneity of a reaction in cells does not depend on whether ΔG0 for the reaction is positive or negative.3) Both oxidative phosphorylation and photophosphorylation involve oxidation of H2O to O24) Only chemical potential energy contributes to proton motive force in mitochondria.Which one of the following combinations represents all INCORRECT statements?

Match the enzymes in Column A with their respective biological function in Column B:Choose the correct combinations of answers from the options given below: