Question

34.

After observing that fish live in clean water, but not polluted water researchers state polluted water killed fish. This statement is an example of

37.

amaze your friends explain to them while sweating at the gym that the body heat generating while exercising is an example of

38.

A reaction in which the free energy of the product is greater than the free energy of the reactant would be described as

39

a plant has a unique photosynthetic pigment. The leaves of these. plants appear to be reddish yellow. What wavelength of visible light is being absorbed by this pigment?

40.

Assume you have added 100 times as much as H+ to a solution that was ph. 7.0. the new ph would be?

41.

As a protein folded into its tertiary structure is potentially stabilized by?

45. carrots are good for your eyesight as they provide the light absorbing molecule vitamin a which is derived from beta carotene. beta carotene is derived from

131.

Many enzymes require NAD and NADH for a reaction to occur. NAD+ and NADH are considered

Answer 1

ANS (131)- Enzymes required NAD(Nicotinamide adenine dinucleotide ) and NADH() in an oxidation-reduction reaction to occur because NAD and NADH considered as a coenzyme to them.

• The coenzyme (also called cofactors)is the organic or inorganic molecule which is a non- protein,part of enzymes, used by the enzyme so it can increase activity in a reaction.that's why cofactor molecules are considered as a helper molecule for an enzyme that utilized in the transformation of the substrate molecule.
• In a redox reaction, NAD+ is an oxidizing agent that accepts the electron from one molecule and becomes NADH, and NADH is a reduced agent that donates the electron to another molecule and becomes NAD+.

(NAD+) + ( H+) + 2 electrons----------------Reversible process---------> NADH.

• NAD and NADH+ coenzyme found in every living cell.
• Example - NAD is used as a coenzyme for pyruvate dehydrogenase in the glycolysis pathway.