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Membrane Structure and Functions MCQ Questions & Answers

Membrane Structure and Functions MCQs : This section focuses on the "Membrane Structure and Functions". These Multiple Choice Questions (MCQs) should be practiced to improve the Membrane Structure and Functions skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.




Question 1

In membranes, lipids are

A. glycerophospholipids
B. sphingolipids
C. sterols
D. all of these

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Question 2

Which of the following is not found in membranes?

A. Glycoproteins
B. Glycolipids
C. Nucleic acids
D. Phospholipids

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Question 3

The plasma membrane is a selectively permeable barrier due to presence of specific transport

A. proteins
B. amino acids
C. carbohydrates
D. none of these

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Question 4

Membrane lipids are

A. hydrophilic
B. hydrophobic
C. ampiphillic
D. none of these

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Question 5

Which type of molecule spans the membrane, from its inner to outer surface according to the Fluid mosaic model of cell membranes?

A. Cholesterol
B. Phospholipid
C. Protein
D. Carbohydrate

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Question 6

Bacteriorhodopsin

A. absorbs light and pumps protons
B. is an integral membrane protein
C. contains primarily alpha-helical residues
D. all of the above

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Question 7

Which of the following is correct?

A. Membranes form boundaries around the cell and distinct subcellular components
B. Membranes act as selectively permeable barrier
C. Membranes contain varying amount of lipid and protein and some contain small amount of carbohydrates
D. All of the above

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Question 8

The membrane proteins that catalyze active transport reactions differ from soluble enzymes as

A. they are permanently changed during the reaction
B. the substrates of the reaction are all outside the cell
C. they do not enhance the rates of reaction
D. the products of the reaction move in a specific direction

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Question 9

Pinocytosis occurs in

A. all eukaryotic cells
B. all prokaryotic cells
C. mitochondria of all cells
D. none of these

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Question 10

Lysozymes are found in

A. plant cells
B. animal cells
C. microbial cells
D. all of these

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Question 11

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

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Question 12

The smooth endoplasmic reticulum (SER) is the site of

A. phospholipid synthesis
B. amino acid synthesis
C. carbohydrate synthesis
D. protein synthesis

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Question 13

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

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Question 14

The model that is now known to be correct for the structure of biological membrane is

A. Fluid mosaic model
B. Page's model
C. Lac Operon model
D. Lock and Key model

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Question 15

The mesosomes may be the sites of

A. DNA replication and specialized enzymatic reactions
B. RNA replications and specialized enzymatic reactions
C. RNA replications and specialized cyclic reactions
D. None of the above

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Question 16

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

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Question 17

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

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Question 18

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

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Question 19

The movement of molecules across a membrane by passive transport does not require

A. an input of metabolic energy
B. internal energy
C. vibrational energy
D. none of these

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Question 20

Peptidoglycan is a complex consisting of

A. oligo-saccharide and protein
B. polysaccharide and protein
C. mono-saccharide and protein
D. aminoacid and carbohydrate

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Question 21

Which of the following is correct?

A. Peroxisomes have a single boundary membrane
B. Peroxisomes contain enzymes that degrade fatty acids and amino acids
C. The byproduct of given reactions in (b) is toxic to cells
D. All of the above

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Question 22

In active transport, the membrane structure that functions is

A. cholesterol
B. integral proteins
C. carbohydrates
D. hydrophobic molecules

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