Explore topic-wise MCQs in Biochemistry.

This section includes 20 Mcqs, each offering curated multiple-choice questions to sharpen your Biochemistry knowledge and support exam preparation. Choose a topic below to get started.

1.

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» B. three dimensional solutions of oriented lipids and globular proteins
Discussion
2.

Membrane lipids are
A. hydrophilic
B. hydrophobic
C. ampiphillic
D. none of these
Answer» B. hydrophobic
Discussion
3.

Pinocytosis occurs in
A. all eukaryotic cells
B. all prokaryotic cells
C. mitochondria of all cells
D. none of these
Answer» B. all prokaryotic cells
Discussion
4.

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
Answer» B. internal energy
Discussion
5.

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» B. polysaccharide and protein
Discussion
6.

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
Answer» B. RNA replications and specialized enzymatic reactions
Discussion
7.

In active transport, the membrane structure that functions is
A. cholesterol
B. integral proteins
C. carbohydrates
D. hydrophobic molecules
Answer» C. carbohydrates
Discussion
8.

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
Answer» B. Page's model
Discussion
9.

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» B. the long branched hydrocarbon along with the four hydrocarbon rings
Discussion
10.

Lysozymes are found in
A. plant cells
B. animal cells
C. microbial cells
D. all of these
Answer» C. microbial cells
Discussion
11.

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
Answer» B. amino acids
Discussion
12.

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
Answer» D. Carbohydrate
Discussion
13.

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» E.
Discussion
14.

In membranes, lipids are
A. glycerophospholipids
B. sphingolipids
C. sterols
D. all of these
Answer» E.
Discussion
15.

Which of the following is not found in membranes?
A. Glycoproteins
B. Glycolipids
C. Nucleic acids
D. Phospholipids
Answer» D. Phospholipids
Discussion
16.

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» B. out of the cell across the plasma membrane into the intracellular space
Discussion
17.

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
Answer» E.
Discussion
18.

The smooth endoplasmic reticulum (SER) is the site of
A. phospholipid synthesis
B. amino acid synthesis
C. carbohydrate synthesis
D. protein synthesis
Answer» B. amino acid synthesis
Discussion
19.

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» E.
Discussion
20.

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» D. spans the thickness of the bilayer
Discussion