Question

Please answer all.. Thank you

73.) Coenzymes serve as carrier molecule, the coenzyme may be?

a.) derived from vitamins

b) integral proteinsof all membrane

c.) both correct

d.) none is correct

(1 pts) 74) Which of the following cellular activities does (do) not require metabolic energy? heat production O motility facilitated diffusion active trasnport All of the above require metabolic energy 75) Which of the following statements regarding the peptide chain of peptidoglycan is true? i. Several of the amino acids in the chain may exist in the D-isomer configuration. ii. Cross-linkage of the peptide chains imparts great rigidity to the total cell wall structure. i. Some peptidoglycans have peptide bridges which cross-link the peptide chains. iv. Peptide chains project from adjacent NAM (AMA) components to NAG (AGA) components. statements i., il., and iii. statements i. and ii. o statements ii. and iv. statement iv. All of the above are true 76) Cyanide is a strong inhibitor of iron-containing enzymes because it binds with iron and deprives the enzyme of its cofactor. Which of the following would be subject to this noncompetitive inhibition? oxidation phosphorylation reverse electron flow system used by chemoautotrophs O non-cyclic photophosphorylation Two of the above are correct. All of the above are correct.

Answer 1

1. A. Coenzymes are derived from vitamins

The non-protein part of enzyme,which is essential for the enzyme activity are called co-enzymes. Co-enzymes are derived from vitamins and other organic molecules. Example- co-enzymeA is made up of vitamin B5, pantothenic acid

2. Facilitated diffusion

Facilitated diffusion is a passive transport where the transport of molecules occurs through integral proteins and it doesnot require any kind of energy produced by ATP hydrolysis.

3. All of the statements are true

Peptidoglycan layer is the cellwall of bacteria made up of sugar and amino acids. The sugars are alternating residues of NAG and NAM, which is attached to 3-5 amino acid peptide chain. Peptide chain cross links with one another and offers rigidity. Peptidoglycan are made up of both L and D amino acids like L- alanine, D-glutamine,L-Lysine and D- alanine.

4. Oxidative phosphorylation

Cyanide is an inhibitor of cytochrome c oxidase, complex 4 of ETC in which it prevents the transfer of electrons from cytochrome c to oygen and hence the synthesis of ATP molecules. Cytochrome C oxidase is made up of iron,which is essential for the enzyme to function. The binding of cyanide to iron, makes the enzyme non functional.