Plant Structure

Question: In plant cells, which of the following is not a function of the large central vacuoles of plant cells?
[A].

Storage of food

[B].

Support

[C].

Contractile regulation of

[D].

Waste storage water content

Answer: Option C

Explanation:

No answer description available for this question.

Question: Lysosomes are associated with
[A].

photosynthesis

[B].

respiration

[C].

storage

[D].

digestion

Answer: Option D

Explanation:

No answer description available for this question.

Question: If complex III were incorporated into an artificial lipid vesicle in order to demonstrate it’s proton translocating ability in isolation, which of the following would be an appropriate electron donor?
[A].

Cytochrome c red

[B].

Cytochrome c peroxidase

[C].

Ubiquinol (UQH2)

[D].

Cytochrome c oxidase

Answer: Option C

Explanation:

No answer description available for this question.

Question: Why do some redox reactions in cells result in the transfer of electrons from a reductant with a higher standard redox potential to an oxidant with a lower standard redox potential?
[A].

Redox potentials are defined under standard conditions, and cellular conditions are typically not standard conditions

[B].

The rules governing oxidation and reduction apply only in vitro, and not in vivo

[C].

Electrons always go from reductants with high redox potentials to oxidants with low redox potentials

[D].

None of the above

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following statements about mitochondrial proteins is true?
[A].

All mitochondrial proteins are coded for and synthesized in the mitochondria

[B].

Some mitochondrial proteins are coded for and synthesized in the mitochondria and others

[C].

All mitochondrial proteins are imported from the cytoplasm

[D].

Mitochondrial proteins arise from other mitochondrial proteins

Answer: Option B

Explanation:

No answer description available for this question.

Question: Mitochondria can be expected most numerous in
[A].

green cells

[B].

red blood cells

[C].

muscle cells

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following statements about the outer mitochondrial membrane is not true?
[A].

The outer membrane is impermeable to hydrogen ions

[B].

The outer membrane is highly permeable to substances of small molecular weight

[C].

The outer membrane is about 50% lipid and 50% protein by weight

[D].

The outer membrane contains porins

Answer: Option A

Explanation:

No answer description available for this question.

Question: Which of the following observations is not used as evidence to support the concept of endosymbiotic origin of chloroplasts and mitochondria?
[A].

Both have their own DNA

[B].

Both have their own ribosomes

[C].

Both strongly resemble prokaryotes, especially in size

[D].

Both can live and function independently of the cell

Answer: Option D

Explanation:

No answer description available for this question.

Question: Any system that is not at equilibrium
[A].

is thermodynamically unstable, although it may be kinetically stable

[B].

is kinetically unstable, although it may be thermodynamically stable

[C].

is rushing toward equilibrium at a very rapid rate

[D].

requires an enzyme to reach equilibrium

Answer: Option A

Explanation:

No answer description available for this question.

Question: Cellular metabolism is an example of
[A].

equilibrium metabolism

[B].

steady-state metabolism

[C].

a series of reactions occurring under standard conditions

[D].

a series of reactions that defy the second law of thermodynamics

Answer: Option B

Explanation:

No answer description available for this question.