Biochemistry Lecture -Final Exam Review

What is the primary location of oxidative phosphorylation in eukaryotic cells?

• nucleus

• mictochondria

• cytoplasm

• endoplasmic reticulum

During strenuous exercise, the NADH formed in the glyceraldehyde 3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD+ if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is:

• dihydroxyacetone phosphate → glycerol 3-phosphate

• pyruvate → lactate

• isocitrate → α-ketoglutarate

• glucose 6-phosphate → fructose 6-phosphate

The conversion of ribose-5-phosphate to glyceraldehyde-3-phosphate and fructose-6-phosphate involves which enzyme?

• Transketolase

• Ribulose-5-phosphate isomerase

• Transaldolase

• Ribose-5-phosphate reductase

Ammonia is primarily generated from the breakdown of _____________.

• carbohydrates

• lipids

• proteins

• nucleic acid

The regulation of oxidative phosphorylation depends on ____________.

• Magnitude of proton motive force.

• Magnitude of ion motive force

• Magnitude of electron motive force

• all of these

The primary purpose of the urea cycle is to:

• Generate fatty acids

• Synthesize amino acids

• Remove ammonia from the body

• Produce energy

Which enzyme catalyzes the formation of carbamoyl phosphate in the urea cycle?

• Arginase

• Ornithine transcarbamylase

• Carbamoyl synthetase I

• Argininosuccinate synthetase

Which molecule carries electrons from complex III to complex IV in the electron transport chain?

• NADH

• FADH2

• cytochrome C

• Ubiquinone (Q)

What is the final product of oxidative phosphorylation?

• ATP

• NAD+

• FADH

• Water

Which complex of the electron transport chain does not pump protons but contributes electrons to the chain?

• Complex I (NADH dehydrogenase)

• Complex III (Cytochrome bc1 complex)

• Complex IV (Cytochrome c oxidase)

• Complex II (Succinate dehydrogenase)