quiz #4 (biology)

which of the following metabolic processes normally occurs regardless of whether or not oxygen (O2) is present?

• citric acid cycle

• glycolysis

• oxidative phosphylation

• lactate fermentation

starting with one molecule of glucose, glycolysis results in the net production of which of the following sets of energy-containing products?

• 2 NADH, 2 pyruvates, 2 ATP

• 2 NADH, 5 pyruvates, 5 ATP

• 6 ATPS

• 1 ATP, 2 pyruvates, 3 NAD+

During glycolysis, when each molecule of glucose us catabolized to two molecules of pyruvate, most of the potential energy contained in the original glucose is...

• stored in the NADH produced

• transferred to ADP, forming ATP

• retained in two pyruvates

• transferred directly ATP

if you remove the mitochondria from a cell, could it still produce ATP from glucose?

• yes, by glycolysis

• using ATP synthase

• yes, by citric acid cycle

• yes, electron transport chain

which of the following statements describes what happens to a molecule that functions as the reducing agent (electron donor) in a redox or oxidation-reduction reaction?

• gains electrons and gains potential energy

• loses electrons and loses potential energy

• gains electrons loses potential energy

• loses electrons and gains potential energy

what happens to a glucose molecule when it loses a hydrogen atom as the result of an oxidation-reduction reaction?

• the glucose is oxidized

• glucose is hydrolyzed

• glucose is reduced

which of the following is true for anabolic pathways?

• they do not depend on enzymes

• they consume energy to build up polymers from monomers

• they release energy to degrade polymers from monomers

• they are usually spontaneous chemical reactions

which of the following is a statement of the FIRST law of thermodynamics?

• energy cannot be created or destroyed

• entropy of the universe is increasing

• entropy of the universe is constant

which of the following statements about enzyme function is true?

• enzyme function is independent of physical and chemical environmental factors such as pH and temperature

• enzyme function is generally increased if the three dimensional structure or conformation of an enzyme is altered

• enzymes increase the rate of chemical reactions by lowering activation energy barriers

• enzymes increase the rate of chemical reactions by providing activation energy to the substrate

pyruvate, the end product of glycolysis, enters the citric acid cycle after it has been converted into....

• acetaldehyde

• lactic acid

• acetic acid

• acetyl CoA