PPSC Lecturer Chemistry Test 35 Online Preparation MCQs

Leave a Comment / By Hassan / May 23, 2021

Given below on this Website Online Free Taleem is free online MCQ’s test related to PPSC of Lecturer Chemistry. All the individuals who are going to appear in PPSC Lecturer of Chemistry written test can attempt these tests in order to prepare for it in best possible way. Our tests include all the important questions MCQs of Lecturer of PPSC Chemistry, all Past Papers of Lecturer of Chemistry PPSC that have extremely high amount of chances for been included in the actual exam which make our test undoubtedly the best source of preparation.

Note:-

There will be 25 multiple choice question in the test.
Answer of the questions will change randomly each time you start this test.
Practice this test at least 5 times if you want to secure High Marks.
At the End of the Test you can see your Test score and Rating.
If you found any incorrect answer in Quiz. Simply click on the quiz title and comment below on that MCQ. So that I can update the incorrect answer on time.

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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

The monomeric units that make up peptides and protein polymers are

amylopectins

nucleic acids

oligosaccharides

amino acids

2 / 25

What are enzymes?

proteins that catalyze chemical reactions

unsaturated fats that catalyze chemical reactions

DNA molecules that catalyze chemical reactions

saccharides that catalyze chemical reactions

3 / 25

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

Ester linkage

Ether linkage

Peptide linkage

α,β-Linkage

4 / 25

A zwitterion is

an ion that is positively charged in solution

a carbohydrate with an electrical charge.

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

an ion that is negatively charged in solution

5 / 25

Which of the following are capable of denaturing proteins?

extreme pH

heat

all of the these

organic solvents

6 / 25

The five elements present in most naturally occurring proteins are :

C, H, O, S, and I

N, S, C, H, and O

C, H, O, P, and S

N, C, H, O, and I

7 / 25

Which one of the following compounds form zwitterions?

carbonyl compounds

heterocyclic compounds

phenols

amino acids

8 / 25

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

pH > pKa

zwitterionic

pH = 7

pH < pKa

9 / 25

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

conformation of the protein backbone

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

location of the disulfide bridges in the peptide chain

sequence of amino acids in the peptide chain

10 / 25

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

tertiary and quaternary structures

secondary and tertiary structures

primary and secondary structures

secondary, tertiary, and quaternary structures

11 / 25

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

protecting the N-terminal of the peptide

determining the number and kind of amino acids in the peptide

reducing the disulfide bridges in the protein

protecting the C-terminal of the peptide

12 / 25

Glycine reacts with nitrous acid to form :

Glycollic acid

Diketopiperazine

Ethyl alcohol

Methylamine

13 / 25

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

all of the above

conformation of the protein backbone

parallel β-pleated sheet

α-Helix

14 / 25

Proteins are

α-Polymers of ethylene

Polymers of propylene

polyamides

Polymers of ethylene

15 / 25

When glycine is heated, it forms

Butyrlactam

Butyric acid

Acrylic acid

Diketopiperazine

16 / 25

Glycine is

NH2CH2CH2CH2CH2NH2

NO2CH2CH2COOH

BrCH2COOH

NH2CH2COOH

17 / 25

Glycine is a unique amino acid because it

cannot form a peptide bond

has a sulfur containing R group

is an essential amino acid

has no chiral carbon

18 / 25

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

Schmidt reaction

Strecker's synthesis

Reduction of nitro compounds

Hofmann's degradation of amides

19 / 25

The isoelectric point of a protein is

None of these.

the electric charge under isothermal conditions. (b) 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.

20 / 25

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

Free radicals

Carbonium ions

Carbanion

Zwitterion

21 / 25

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

hydrolyzed

electrolyzed

oxidized

dehydrated

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

A zwitterion has which of the following properties

a high melting point

soluble in water

all of these

no net charge

24 / 25

The nitrogen content of proteins can be quantitatively determined by

Victor Meyer's method

Kjeldahl's method

Carius method

Rast method

25 / 25

Which of the following structures can polypeptides have?

tertiary structure

primary structure

secondary structure

all of the these

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PPSC Lecturer Chemistry Test 35 Online Preparation MCQs

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