Biochemistry MCQ Quiz

Check points before attempting this Biochemistry MCQ Quiz:

1. There are 25 questions in Biochemistry MCQ quiz . Attempt all MCQs it’s totally worth it (Don’t do it in final CSIR NET JRF EXAM, as there you will have more freedom of choice for questions and limited time like in final exam you have to answer 25 questions out of 75 , which means you can attempt 1 question out of 3 in 2 hours (give entire 2 hours for part ‘C’ then after completing part ‘C’ go for Part ‘B’ it would be beneficial for you). This biochemistry MCQ quiz has mixed questions of both Part C and Part B. In this Biochemistry MCQ quiz we haven’t given you optional questions as we have included only selective topics from Biochemistry like :

• Enzymes
• Carbohydrates
• Amino Acids
• Ramachandran plot
• Protein structure

2. All these 25 Biochemistry questions has taken directly from CSIR NET Life Science previous year’s question papers. So it may seems difficult for you if you are the beginner, so just go through the entire quiz and read all the questions carefully write down the concepts or words that you have encountered 1st time in life and search them in books and online resources! You can Download Free Biochemistry Books in pdf format provided by biologywala.com/freebooks.

3. Then after completing your studies again come back to quiz and attempt these Biochemistry questions you will find it little bit easy than your previous attempt. Repeat this strategy for rest of the test and you will find you are becoming better and better day by day, Remember you can’t learn Life Science in just one day it needs consistent efforts with well planned strategy.

4. The rest biochemistry questions we will cover in upcoming test series no. 2nd, 3rd, 4th…! You have 2500 seconds ( 41 minutes 40 seconds) to complete this test means average 100 seconds for each question) after that answering all biochemistry questions, the quiz will automatically submit and it will generate your result immediately !

5. Some of these Biochemistry mcq quiz questions are too short that it takes less than 30 seconds to read hence read biochemistry MCQ carefully (invest your time in question once you understand the soul of the question you will win half of your battle there itself) and you don’t need to come back again after reading options which may drive you in state of confusion and ultimate will waste your time.

6. Don’t Skip biochemistry questions without answering, attempt all of them, as it will test not just your knowledge but also your mental toughness there will be few questions in exam for which you haven’t studied but just logically by elimination method you can solve this kind of questions which will boost your confidence and understanding of exam pattern.

7. Last but not the least, attempt all Biochemistry MCQ quiz questions with full attention without multitasking and any distraction. (If you can’t do it now then don’t attempt it Now, complete your work and then come back, believe me, this biochemistry mcq quiz won’t go anywhere).

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Created on October 23, 2020 By Sachin Chavan

Biochemistry test 1

NameEmail

1 / 25

Which nitrogen of adenosine gets protonated if pH of nucleoside is lowered from 7 to 3 ? (JUNE 2012)

N1

N3

N7

N9

2 / 25

The confirmation of nucleotide in DNA is affected by rotation about how many bonds?

4

6

7

3

3 / 25

Which one of the following places has the largest hydrogen bonding possibility?

Adenine

Guanine

Cytosine

Uracil

4 / 25

In which of DNA, the number of base pairs per helical turn is 10.5? (DEC 2011)

A

B

X

Z

5 / 25

Out of the statements mentioned below:

A) l-threonine and L-allo-threonine interact identically with plane polarised light.

B) Van der Waals interaction are always attractive.

C) Poly (Pro) II helix is not established by intermolecular hydrogen bonds.

D) The folding of a protein is associated with and overall positive change in free energy and negative change in entropy.

E) Lysine acetylation on histone is associated with losing of histone complex from DNA.

Which of the following combinations is CORRECT ?

A and C

B and D

C and E

D and E

6 / 25

A protein is composed of leucine, isoleucine, alanine, glycine, proline, one lysine, one arginine and two cysteines connected by disulfide bond. Conformational analysis indicates that the protein has elements of helix and beta structure. The protein is most likely____ . (JUNE 2014)

non-specific protease

not an enzyme

a lipase

a flippase

7 / 25

Which one of the following is the most appropriate statement regarding folded proteins? (JUNE 2014)

Charged amino acid side chains are always buried.

Charged amino acid side chains are seldom buried.

Non polar amino acid side chains are seldom buried.

Tyrosine residue was are always buried.

8 / 25

In an Alpha helical polypeptide, the backbone hydrogen bonds are between____. (JUNE 2015)

NH of n and CO of n+4 amino acids.

CO of n and NH of n+3 amino acids.

CO of n and NH of n+4 amino acids.

NH of n and CO of n+3 amino acids.

9 / 25

Indicate which one of the following statements about nucleic acids and protein structures is correct? (JUNE 2016)

Hydrogen bonding between the bases in the major and minor grooves of DNA is absent.

Both uracil and thymine have methyl group but at different positions.

The backbone dihedral angles of α-helices and β-turn is determined by the dihedral angles of second and third amino acid.

A β-turn is formed by four amino acids. The type of β-turn is determined by the dihidral angles of the second and third amino acid.

10 / 25

Which one of the following is unfavourable for protein folding ? (JUNE 2014)

Hydrophobic interaction

Van der Waals interaction

Conformational entropy

Hydrogen bonding

11 / 25

Indicate which one of the following statements about nucleoc acids and protein structures is correct? (JUNE 2016)

Hydrogen bonding between the bases in the major and minor grooves of DNA is absent.

Both uracil and thymine have methyl group but at different positions.

The backbone dihedral angles of α-helices and β-turn is determined by the dihedral angles of second and third amino acid.

12 / 25

Choose the correct statement about peptides in Ramachandran plot. (DEC 2016)

Peptides that are unstructured will have all the backbone dihedral angles in the disallowed regions.

It is not possible to conclude whether to peptides adopts entirely helix or entirly beta sheet confirmation.

The occurrence of beta turn confirmation formation in a peptide can be deduced.

The sequence of peptide can be deduced.

13 / 25

The φ and ψ values of β-stand composed of all D-amino acids will mainly occupy which quadrant in the Ramachandran plot? (DEC2017)

upper left

upper right

lower left

lower right

14 / 25

The area of allowed regions in the Ramachandran map will be least for____.(DEC 2011)

Gly

L-Ala

L-Prol

α-methyl L-Valine

15 / 25

Choose the correct statement for the following: (DEC 2017)

Disulfide bonds in a 20 residue peptide can be formed only if cysteines are adjacent to each other.

The amino acid Isoleucine has only one chiral centre.

Both bases and sugar contribute to chirality of nucleic acid.

The pI of aspartic acid is less than that of glutamic acid

16 / 25

From the following statements, pick the combination with all INCORRECT statements.

A)The enzymes enhance reaction rate for factor of 2 to 10.

B) The activation energy for a reaction is lowered by enzymes.

C) The interactions between enzymes and substrates are hydrogen bonding hydrophobic and ionic.

D) Substrate concentration does not affect the rate of enzyme catalyzed reaction.

A,B

B,C

A,C

A,D

17 / 25

Enzyme parameters of four isozymes is given in the table. These isozymes are localised in different tissues. In liver the substrate concentration is 0.2 micromolar. The liver isozymes is likely to be _____. (DEC 2014)

A

B

C

D

18 / 25

Indicate the incorrect statement from the following: (DEC 2017)

Allosteric enzymes function through reversible non-covalent binding of allosteric modulators or effectors.

Monoclonal antibodies that catalyse hydrolysis of ester or carbonates can be produced.

Enzymes are not inhibited universally by heavy metals such as Hg²+, Ag+.

Acid phosphates hydrolyze biological phosphate esters at ~ pH 5.0

19 / 25

Turn over number and specific activity of an enzyme (molecule weight 40000 D) in reaction (Vmax= 4μmol of substrate reacted/ min, enzyme amount = 2μg) are ____. (JUNE 2016)

80,000/min, 2 x 10³μmol substrate/min

80,000/min, 2 x 10³μmol substrate/second

40,000/min, 1 x 10³μmol substrate/min

40,000/min, 2 x 10³μmol substrate/min

20 / 25

A plot of V/[S] versus V is generated for an enzyme catalysed reaction, and a straight line is obtained. Indicate the information that can be obtained from the plot. (JUNE 2012)

Vmax and turnover number Km can be obtained only from a plot of 1/[S].

Km/Vmax from the slope

Vmax.Km and turnover number

only Km and turnover number

21 / 25

An enzyme catalysed reaction was measured in the presence and absence of an inhibitor for an uncompetitive inhibition,_____. (DEC 2012)

only Km is increased

only Vmax is decreased

both Km and Vmax are decreased

both Km and Vmax are not affected

22 / 25

If the product of an enzyme binds to enzyme-substrate complex to exhibit its activity through a decrease in both Km and Vmax this type of inhibition is called____.

competitive inhibition

non-competitive inhibition

uncompetitive inhibition

partially-competitive inhibition

23 / 25

Reaction products inhibit catalysis enzymes by____. (DEC 2014)

Covalently binding to the enzyme

Altering the enzyme structure

Occupying the active site

Form a complex with substrate

24 / 25

Michaelis and Menten derived their equation using which of the following assumption? (DEC 2011)

Rate limiting step in reaction is breakdown of ES complex to product and free Enzyme

Rate limiting step in the reaction is the formation of ES complex

Concentration of the substrate can be ignored

Non enzymatic degradation of substrate is the major step

25 / 25

Enzymes help to lower the activation energies of reactions by____.  (DEC 2013)

Covalent interaction with a substrate

Binding only with solvent molecules.

Changing reaction equilibria.

Farming weak interactions with substrate.

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