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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

When glycine is heated, it forms

Butyrlactam

Diketopiperazine

Butyric acid

Acrylic acid

2 / 25

Glycine reacts with nitrous acid to form :

Ethyl alcohol

Methylamine

Glycollic acid

Diketopiperazine

3 / 25

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

secondary and tertiary structures

tertiary and quaternary structures

primary and secondary structures

secondary, tertiary, and quaternary structures

4 / 25

Glycine is a unique amino acid because it

cannot form a peptide bond

has no chiral carbon

has a sulfur containing R group

is an essential amino acid

5 / 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

6 / 25

Which of the following structures can polypeptides have?

all of the these

tertiary structure

primary structure

secondary structure

7 / 25

Which of the following are capable of denaturing proteins?

heat

organic solvents

extreme pH

all of the these

8 / 25

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

Strecker's synthesis

Hofmann's degradation of amides

Reduction of nitro compounds

Schmidt reaction

9 / 25

Which one of the following compounds form zwitterions?

heterocyclic compounds

carbonyl compounds

phenols

amino acids

10 / 25

A zwitterion is

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.

an ion that is positively charged in solution

11 / 25

What are enzymes?

DNA molecules that catalyze chemical reactions

unsaturated fats that catalyze chemical reactions

proteins that catalyze chemical reactions

saccharides that catalyze chemical reactions

12 / 25

Glycine is

NH2CH2COOH

NO2CH2CH2COOH

NH2CH2CH2CH2CH2NH2

BrCH2COOH

13 / 25

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

Ester linkage

Ether linkage

α,β-Linkage

Peptide linkage

14 / 25

The nitrogen content of proteins can be quantitatively determined by

Victor Meyer's method

Carius method

Kjeldahl's method

Rast method

15 / 25

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

all of the above

α-Helix

parallel β-pleated sheet

conformation of the protein backbone

16 / 25

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

Free radicals

Zwitterion

Carbanion

Carbonium ions

17 / 25

Proteins are

Polymers of propylene

Polymers of ethylene

polyamides

α-Polymers of ethylene

18 / 25

A zwitterion has which of the following properties

no net charge

a high melting point

all of these

soluble in water

19 / 25

The five elements present in most naturally occurring proteins are :

N, C, H, O, and I

C, H, O, P, and S

C, H, O, S, and I

N, S, C, H, and O

20 / 25

The isoelectric point of a protein is

None of these.

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.

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

21 / 25

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

hydrolyzed

oxidized

dehydrated

electrolyzed

22 / 25

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

Wavelength

Dipole moment

Isoelectric point

Iodine number

23 / 25

The monomeric units that make up peptides and protein polymers are

oligosaccharides

amylopectins

nucleic acids

amino acids

24 / 25

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

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

sequence of amino acids in the peptide chain

location of the disulfide bridges in the peptide chain

conformation of the protein backbone

25 / 25

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

pH = 7

pH > pKa

pH < pKa

zwitterionic

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