Biology Exam 2: Chapter 7

Which of the following processes is (are) required for the complete oxidation of glucose? The Krebs cycle Glycolysis Pyruvate oxidation All of the choices are correct.

All of the choices are correct.

Which of the following is NOT a product of glycolysis? ATP Pyruvate CO2 NADH

CO2

Which of the following is NOT a true statement regarding cellular respiration? Enzymes catalyze reactions that transfer electrons. Electrons have a higher potential energy at the end of the process. Carbon dioxide gas is a by-product. The process involves multiple redox reactions.

Electrons have a higher potential energy at the end of the process.

What is the role of NAD+ in the process of cellular respiration? It functions as an electron carrier. It functions as an enzyme. It is the final electron acceptor for anaerobic respiration. It is a nucleotide source for the synthesis of ATP.

It functions as an electron carrier.

What is the importance of fermentation to cellular metabolism? It generates glucose for the cell in the absence of O2. It oxidizes NADH to NAD+ during electron transport. It oxidizes NADH to NAD+ in the absence of O2. It reduces NADH to NAD+ in the absence of O2.

It oxidizes NADH to NAD+ in the absence of O2.

The direct source of energy for the ATP produced by ATP synthase comes from the electron transport chain. a proton gradient. substrate-level phosphorylation. the oxidation reactions occurring during respiration.

a proton gradient.

Yeast cells that have mutations in genes that encode enzymes in glycolysis can still grow on glycerol. They are able to utilize glycerol because it enters glycolysis after the step affected by the mutation. can feed into the Krebs cycle and generate ATP via electron transport and chemiosmosis. can be utilized by fermentation. can donate electrons directly to the electron transport chain.

can feed into the Krebs cycle and generate ATP via electron transport and chemiosmosis.

The link between electron transport and ATP synthesis is a high-energy intermediate like phosphoenol pyruvate. is the transfer of electrons to ATP synthase. is a proton gradient. depends on the absence of oxygen.

is a proton gradient.

An autotroph is an organism that extracts energy from organic sources. converts energy from sunlight into chemical energy. relies on the energy produced by other organisms as an energy source. does both a and b.

does both a and b.

The reactions of the Krebs cycle occur in the inner membrane of the mitochondria. intermembrane space of the mitochondria. cytoplasm. matrix of the mitochondria.

matrix of the mitochondria.

The electrons carried by NADH and FADH2 can be pumped into the intermembrane space. transferred to the ATP synthase. moved between proteins in the inner membrane of the mitochondrion. transported into the matrix of the mitochondrion.

moved between proteins in the inner membrane of the mitochondrion.

A chemical agent that makes holes in the inner membrane of the mitochondria would stop the movement of electrons down the electron transport chain. stop ATP synthesis. stop the Krebs cycle. All of the choices are correct.

stop ATP synthesis.

Glycolysis produces ATP by phosphorylating organic molecules in the priming reactions. the production of glyceraldehyde 3-phosphate. substrate-level phosphorylation. the reduction of NAD+ to NADH.

substrate-level phosphorylation

Anaerobic respiration occurs in humans in the absence of O2. occurs in yeast and is how we make beer and wine. yields less energy than aerobic respiration because other final electron acceptors have lower affinity for electrons than O2. yields more energy than aerobic respiration because other final electron acceptors have higher affinity for electrons than O2.

yields less energy than aerobic respiration because other final electron acceptors have lower affinity for electrons than O2.