Ppsc lecturer chemistry

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

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

primary and secondary structures

secondary and tertiary structures

secondary, tertiary, and quaternary structures

tertiary and quaternary structures

2 / 25

Which of the following are capable of denaturing proteins?

heat

extreme pH

organic solvents

all of the these

3 / 25

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

Dipole moment

Isoelectric point

Wavelength

Iodine number

4 / 25

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

protecting the C-terminal of the peptide

reducing the disulfide bridges in the protein

determining the number and kind of amino acids in the peptide

protecting the N-terminal of the peptide

5 / 25

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

pH = 7

zwitterionic

pH < pKa

pH > pKa

6 / 25

Which one of the following compounds form zwitterions?

phenols

carbonyl compounds

amino acids

heterocyclic compounds

7 / 25

Proteins are

polyamides

Polymers of ethylene

Polymers of propylene

α-Polymers of ethylene

8 / 25

A zwitterion has which of the following properties

all of these

no net charge

a high melting point

soluble in water

9 / 25

The monomeric units that make up peptides and protein polymers are

nucleic acids

amino acids

amylopectins

oligosaccharides

10 / 25

A zwitterion is

a carbohydrate with an electrical charge.

an ion that is positively charged in solution

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

an ion that is negatively charged in solution

11 / 25

The five elements present in most naturally occurring proteins are :

N, S, C, H, and O

C, H, O, S, and I

C, H, O, P, and S

N, C, H, O, and I

12 / 25

The nitrogen content of proteins can be quantitatively determined by

Kjeldahl's method

Victor Meyer's method

Rast method

Carius method

13 / 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

14 / 25

Which of the following structures can polypeptides have?

all of the these

tertiary structure

primary structure

secondary structure

15 / 25

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

Peptide linkage

Ester linkage

Ether linkage

α,β-Linkage

16 / 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

17 / 25

Glycine reacts with nitrous acid to form :

Ethyl alcohol

Diketopiperazine

Glycollic acid

Methylamine

18 / 25

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

conformation of the protein backbone

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

19 / 25

When glycine is heated, it forms

Butyrlactam

Acrylic acid

Diketopiperazine

Butyric acid

20 / 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

21 / 25

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

Zwitterion

Carbanion

Free radicals

Carbonium ions

22 / 25

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

dehydrated

oxidized

electrolyzed

hydrolyzed

23 / 25

The isoelectric point of a protein is

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.

None of these.

24 / 25

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

Schmidt reaction

Strecker's synthesis

Hofmann's degradation of amides

Reduction of nitro compounds

25 / 25

Glycine is

NH2CH2CH2CH2CH2NH2

BrCH2COOH

NO2CH2CH2COOH

NH2CH2COOH

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