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PPSC Lecturer Chemistry Test 35 Online Preparation MCQs

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Test Instructions:-
Test Name	Lecturer Chemistry
Subject	Chemistry Test 35
Test Type	MCQs
Total Questions	25
Total Time	20 Minutes
Total Marks	100

You have 20 minutes to pass to the quiz.

PPSC LECTURER OF CHEMISTRY TEST NO. 35

1 / 25

Glycine reacts with nitrous acid to form :

Glycollic acid

Diketopiperazine

Ethyl alcohol

Methylamine

2 / 25

Glycine is a unique amino acid because it

is an essential amino acid

has no chiral carbon

cannot form a peptide bond

has a sulfur containing R group

3 / 25

Which of the following is the first step in the determination of the primary structure of proteins?

reducing the disulfide bridges in the protein

protecting the N-terminal of the peptide

determining the number and kind of amino acids in the peptide

protecting the C-terminal of the peptide

4 / 25

Which one of the following compounds form zwitterions?

amino acids

phenols

carbonyl compounds

heterocyclic compounds

5 / 25

A zwitterion is

an ion that is positively charged in solution

a carbohydrate with an electrical charge.

an ion that is negatively charged in solution

a compound that can ionize both as a base and an acid.

6 / 25

Glycine is

NH2CH2CH2CH2CH2NH2

NH2CH2COOH

BrCH2COOH

NO2CH2CH2COOH

7 / 25

When glycine is heated, it forms

Diketopiperazine

Acrylic acid

Butyrlactam

Butyric acid

8 / 25

The nitrogen content of proteins can be quantitatively determined by

Rast method

Kjeldahl's method

Carius method

Victor Meyer's method

9 / 25

A zwitterion has which of the following properties

soluble in water

a high melting point

all of these

no net charge

10 / 25

When a disulfide linkage is formed, the compound containing this new linkage has been __________.

electrolyzed

oxidized

dehydrated

hydrolyzed

11 / 25

Which of the following is the main structural feature of proteins?

Peptide linkage

Ether linkage

α,β-Linkage

Ester linkage

12 / 25

The five elements present in most naturally occurring proteins are :

C, H, O, P, and S

C, H, O, S, and I

N, C, H, O, and I

N, S, C, H, and O

13 / 25

Which of the following is the “quaternary structure” of proteins concerned with?

location of the disulfide bridges in the peptide chain

sequence of amino acids in the peptide chain

description of the way the peptide chains are arranged with respect to each other

conformation of the protein backbone

14 / 25

Which of the following structures can polypeptides have?

tertiary structure

all of the these

secondary structure

primary structure

15 / 25

Which of the following are capable of denaturing proteins?

heat

organic solvents

extreme pH

all of the these

16 / 25

The isoelectric point of a protein is

None of these.

the pH at which the protein molecule has no charges on its surface.

the pH at which a protein in solution has an equal number of positive and negative charges.

the electric charge under isothermal conditions. (b) None of these.

17 / 25

Which of the following may characterize the “secondary structure” of proteins?

α-Helix

parallel β-pleated sheet

conformation of the protein backbone

all of the above

18 / 25

The monomeric units that make up peptides and protein polymers are

amylopectins

amino acids

nucleic acids

oligosaccharides

19 / 25

What are enzymes?

unsaturated fats that catalyze chemical reactions

DNA molecules that catalyze chemical reactions

proteins that catalyze chemical reactions

saccharides that catalyze chemical reactions

20 / 25

The pH at which the amino acid shows no tendency to migrate when placed in an electric field is known as its

Iodine number

Isoelectric point

Dipole moment

Wavelength

21 / 25

Proteins are

Polymers of propylene

polyamides

α-Polymers of ethylene

Polymers of ethylene

22 / 25

Which of the following reactions is suitable for the preparation of α-amino acids?

Schmidt reaction

Reduction of nitro compounds

Hofmann's degradation of amides

Strecker's synthesis

23 / 25

Which of the following protein structures does “denaturation” destroy?

secondary, tertiary, and quaternary structures

tertiary and quaternary structures

primary and secondary structures

secondary and tertiary structures

24 / 25

Which of the following is correct for an amino acid solution when it is in the acidic form?

zwitterionic

pH > pKa

pH = 7

pH < pKa

25 / 25

An aqueous solution of glycine is neutral because of the formation of :

Free radicals

Carbonium ions

Zwitterion

Carbanion

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