Question

1. Because plant and animal life on earth is impossible without photosynthesis

A. environmental pollution is not a problem

B. there is concern for increasing numbers of plant species that face extinction

C. worldwide decline of insect diversity is of no concern

D. there is no need to consider conservation biology

2. Reactions with a positive ΔG

		can occur as part of coupled reaction
		are reactions that can never happen
		reactions that do not require activation energy
		are exergonic

3. The induced fit is an improved model for enzyme function than the lock and key model because it considers

		considers the Gibbs free energy of the reaction
		considers specificity of the enzyme
		considers the catalytic activity
		considers the rate of reaction

Answer 1

1. Option B

Since the plants are the autotrophs that convert the light energy into chemical energy and acting as the primary producers, the extinction of plants is a concern. Hence the conservation biology is an essential aspect to maintain life on earth. Pollution is one of the reasons that contribute to the extinction of life forms, hence it is a matter of concern. The insects have an active role in the pollination, hence the decline of insect pollution will have an impact on plant diversity and productivity. Hence Option B is correct.

2. Option B

The positive delta G means, the reaction will be a nonspontaneous reaction and need activation energy to happen. Since they need activation energy, they are endergonic reactions.  These reactions can happen as part of a coupled reaction if the net delta G of the reaction is negative.

3. Option B

As per the induced fit model, when an enzyme comes into contact with its substrate, due to the flexible nature of the catalytic site, the enzyme remolds to fit its substrate. The wide specificity of some enzymes like lipases can be explained by this model. As per the Lock and Key hypothesis, the active site will be rigid and the molecule that correctly fits the site can bind with the enzyme. This theory does not explain the free energy or rate of the raction.