5. Proteins

Question 1

Topic - Proteins

Answer 1

@ Hetro/homo polymer
@ Linear chain of
@ di-peptide bond formed when _
@

Question 2

Proteins are ____ (homo/hetero) polymers of amino acids.

Answer 2

Hetropolymers (made up of diff monomeric units)

Question 3

Proteins are polypeptides. i.e., linear chains of amino acids linked by ______ bonds.

Answer 3

peptide bonds

Question 4

*Peptide bond of Di-peptide Amino Acid is formed when:

Answer 4

(–COOH) group of one amino acid reacts with the (–NH2) group of the next amino acid by releasing one water molecule (dehydration)

Question 5

Topic - Functions of Proteins

Answer 5

@ Responsible for _
@ Transport nutrients
@ Intercellular ground substance
@ Antibodies to fight
@ Act as Receptor/Hormone/Enzyme/Pigment
@ Most abundant protein

Question 6

Proteins are responsible for growth and tissue repair.
T/F

Answer 6

True

Question 7

Proteins transport nutrients across cell membranes.
Example.

Answer 7

GLUT-4 enables glucose transport into the cell

Question 8

Proteins act as intercellular ground substances.
Example.

Answer 8

Collagen

Question 9

Protein acts as antibodies to fight infectious
organisms.
T/F

Answer 9

True

Question 10

Example when protein acts as:
1. Receptors
2. Hormones
3. Enzymes
4. Pigments

Answer 10

1. Receptors of smell, taste, hormones
2. Insulin
3. Trypsin
4. Hemoglobin

Question 11

Most abundant protein in the animal world:

Answer 11

Collagen

Question 12

Most abundant protein in the biosphere:

Answer 12

RuBisCO
(Ribulose bisphosphate carboxylase - oxygenase)

Question 13

*Topic - Primary Structure of Protein

Answer 13

@ Position info
@ _ bonds
@ Left end / Right end

Question 14

______ structure describes the sequence of amino acids, i.e., the positional information in a protein.

Answer 14

Primary structure

Question 15

The primary structure has ____ bonds.

Answer 15

Peptide bonds

Question 16

In the chain of Primary structure:
a. Left end has -
b. Right end has -

Answer 16

a. 1st amino acid
(N-terminal amino acid)
b. Last amino acid
(C-terminal amino acid)

Question 17

Topic - Secondary Structure of Protein

Answer 17

@ _ bonds
@ folded as _ or _ sheets
@ α / β -helix is ______ bond.
@ Right/left helix
@ Examples

Question 18

The secondary structure has ____ bonds.

Answer 18

Peptide bond + H bond

Question 19

The secondary structure, thread, is folded as ____ or ____ sheets.

Answer 19

α-helix or β-pleated sheets

Question 20

I. α-helix is ______ bond.
II. β-pleated is ______ bond.

Answer 20

I. Intra-molecular H bond
II. Intermolecular H bond.

Question 21

In the Secondary structure, Proteins have zig-zag and only right-handed helices.
T/F

Answer 21

True

Question 22

Examples of Secondary Structure:
I. α-helix present in ____.
II. β-helix present in ____.

Answer 22

I. Keratin
II. Fibroin

Question 23

Topic - Tertiary Structure of Protein

Answer 23

@ _ bonds
@ Hollow _ ball
@ Most stable and necessary for
@ Examples

Question 24

The tertiary structure has ____ bonds.

Answer 24

Peptide bond + H bond + di-Sulphide bond

Question 25

In the Tertiary structure, the helical polypeptide chain is further folded like a hollow ______ ball.

Answer 25

woolen globular ball

Question 26

Tertiary structure gives a 3-d view and is most stable and necessary for many biological activities of proteins.
T/F

Answer 26

True

Question 27

Examples of Tertiary Structure:

Answer 27

I. Myoglobin
II. All enzymes

Question 28

Topic - Quaternary Structure Protein

Answer 28

@ Different polypeptide chain
@ Each chain function as _
@ Examples

Question 29

In ______ structure, proteins have more than one polypeptide chain forming a tertiary structure, and each chain functions as a subunit of protein.

Answer 29

Quaternary structure

Question 30

Examples of Quaternary structure Protein.

Answer 30

Human Hemoglobin (4 subunits = 2α+2β)