biochem module 8 (1).

biochem module 8
True or False: The majority of reactions of the urea cycle occur in the cytosol. -
CORRECT ANSWER-true

True or False: FADH2 yields 2.5 ATP molecules after donating electrons and
hydrogen atoms to the electron transfer chain (ETC). - CORRECT ANSWER-False

True or False: ATP is invested in the urea cycle. - CORRECT ANSWER-True

True or False: There are five complexes associated with the ETC. - CORRECT
ANSWER-False

True or False: In the production of ATP via ATP synthase, the H+ ions move from the
mitochondrial matrix to the intermembrane space. - CORRECT ANSWER-False

The urea cycle involves _________ reactions (only those in the cyclic portion of the
process).

-4
-5
-6
-8
- 10 - CORRECT ANSWER-- 4

Which amino acids are involved in the urea cycle?

A. Ornithine
B. Aspartate
C. Threonine
D. Both A and B
E. Both A and C - CORRECT ANSWER-D. Both A and B

Fumarate reenters the mitochondrion as which of the following molecules?

- Malate
- Ornithine
- Citrulline
- Fumarase
- Ammonia - CORRECT ANSWER-- Malate

Urea is useful for excreting nitrogen from cells due to its:

- Ability to hydrogen bond with water

, - Ability to form ions
- Large size
- Low melting point
- None of these - CORRECT ANSWER-- Ability to hydrogen bond with water

Which component of the urea cycle is also a member of the CAC?

- Fumarate
- Malate
- Acetyl-CoA
- Citrate
- None of the above - CORRECT ANSWER-- Fumarate

Oxidative deamination results in the removal of __________ from amino acids.

A. N2
B. NH4+
C. NO2
D. NH2
E. NH3 - CORRECT ANSWER-B. NH4+

The following chemical species is __________. - CORRECT ANSWER-Urea

NADH donates electrons and H+ to complex ______.

I
II
III
IV
V - CORRECT ANSWER-I

Which of the ETC complexes do pump H+ ions?

Complex I
Complex II
Complex III
Both A and B
Both A and C - CORRECT ANSWER-Both A and C

What protein shuttles electrons from Complex III to Complex IV?

- NADH dehydrogenase
- Arginase
- Fumarase