Multiple Choice Quiz

Please answer all questions


1	Which of the following is not true of enzymes?
		A)	Enzymes decrease the rate of chemical reactions.
		B)	Most enzymes are proteins.
		C)	Enzymes demonstrate specificity.
		D)	Enzymes decrease the activation energy of a chemical reaction.


2	During an enzyme-mediated reaction
		A)	the substrate changes shape to fit the active site of the enzyme.
		B)	the active site of the enzyme binds the products after the reaction is completed.
		C)	the active site recognizes many substrate molecules.
		D)	the active site may change shape to in order to allow substrate binding.


3	Enzyme activity is usually decreased by
		A)	increased temperature.
		B)	increased substrate concentration.
		C)	decreased product concentration.
		D)	all of the above.


4	Cofactors
		A)	are usually organic molecules which increase enzyme activity.
		B)	are usually metal ions which increase enzyme activity.
		C)	are usually organic molecules which decrease enzyme activity.
		D)	are usually metal ions which decrease enzyme activity.


5	Metabolic pathways
		A)	are often regulated by the concentrations of the intermediate products.
		B)	do not require the presence of enzymes.
		C)	are often regulated by the concentration of the end product.
		D)	do not have branches or interactions.


6	Inborn errors of amino acid metabolism may cause
		A)	Gaucher's disease.
		B)	Homocystinuria.
		C)	Hypercholestremia.
		D)	Lactose intolerance.


7	Entropy
		A)	photosynthesis increases the entropy in the products formed.
		B)	decreases when energy is transformed.
		C)	is a measure of disorganization of a system.
		D)	all of the above.


8	Endergonic reactions
		A)	release heat as the reaction proceeds.
		B)	release energy as the reaction proceeds.
		C)	are never part of cellular metabolism.
		D)	require an input of energy to proceed.


9	Reducing agents
		A)	donate electrons during a chemical reaction.
		B)	accept electrons during a chemical reaction.
		C)	are reduced during a chemical reaction.
		D)	include NAD and FAD.


10	The universal energy carrier in biological systems is
		A)	NADH.
		B)	FADH2.
		C)	GTP.
		D)	ATP.

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