Membrane Structure and Functions

Question: Bacteriorhodopsin
[A].

absorbs light and pumps protons

[B].

is an integral membrane protein

[C].

contains primarily alpha-helical residues

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: Biological membranes are like water beds because
[A].

they are always moving

[B].

they (normally) do not leak their contents

[C].

the membrane is thin compared to the enclosed volume

[D].

all of the above

Answer: Option D

Explanation:

No answer description available for this question.

Question: In active transport, the membrane structure that functions is
[A].

cholesterol

[B].

integral proteins

[C].

carbohydrates

[D].

hydrophobic molecules

Answer: Option B

Explanation:

No answer description available for this question.

Question: Cholesterol is somewhat amphipathic due to
[A].

the single hydroxyl along with the hydrocarbon nature of the remainder of the molecule

[B].

the long branched hydrocarbon along with the four hydrocarbon rings

[C].

the five-methyl groups along with the hydrocarbon chain

[D].

the three six-membered rings along with the single five-membered ring

Answer: Option A

Explanation:

No answer description available for this question.

Question: Cholesterol is essential for normal membrane functions because it
[A].

plugs up the cardiac arteries of older men

[B].

cannot be made by higher organisms

[C].

keeps membranes fluid.

[D].

spans the thickness of the bilayer

Answer: Option C

Explanation:

No answer description available for this question.

Question: Exocytosis is the secretion of proteins
[A].

out of the cell across the plasma membrane into the extracellular space

[B].

out of the cell across the plasma membrane into the intracellular space

[C].

is the uptake of macromolecules from the extracellular space into the cell across the plasma membrane

[D].

is the uptake of macromolecules from the intracellular space into the cell across the plasma membrane

Answer: Option A

Explanation:

No answer description available for this question.

Question: In Fluid mosaic model, the biological membrane can be viewed as
[A].

two dimensional solutions of oriented lipids and globular proteins

[B].

three dimensional solutions of oriented lipids and globular proteins

[C].

two dimensional solutions of oriented lipids and carbohydrate

[D].

three dimensional solutions of oriented lipids and carbohydrate

Answer: Option A

Explanation:

No answer description available for this question.

Question: Membrane lipids are
[A].

hydrophilic

[B].

hydrophobic

[C].

ampiphillic

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: In membranes, lipids are
[A].

glycerophospholipids

[B].

sphingolipids

[C].

sterols

[D].

all of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Peptidoglycan is a complex consisting of
[A].

oligo-saccharide and protein

[B].

polysaccharide and protein

[C].

mono-saccharide and protein

[D].

aminoacid and carbohydrate

Answer: Option A

Explanation:

No answer description available for this question.