Important MCQ On Biomolecules Based on NCERT Textbook 9 Chapter.

      QUESTION based on NCERT textbook.

Q1 The two functional groups characteristic of sugars Are … … [ NEET 2018] 

 a) hydroxyl and methyl  

 b) carbonyl and methyl  

 c) carbonyl and phosphate  

 d) carbonyl and hydroxyl

Q2) Many ribosomes may associate with a single mRNA to for m mu ltiple copies of a polypeptidesimultaneously. Such strings of ribosomes are termed as … … [NEET -2018] 

 a) Polysome  

 b) Polyhedral bodies  

 c) Plastidome  

 d) Nucleosome

Q3) Which of the following are not polymeric? ….[NEET- 2017] 

 a) Nucleic acids  

 b) Proteins  

 c) Polysaccharides  

 d) Lipids

Q4)Which one of the following statements is correct, with reference to enzymes? ….[NEET- 2017]

 a) Apoenzyme = Holoenzyme + Coenzyme

 b) Holoenzyme = Apoenzyme + Coenzyme

 c) Coenzyme = Apoenzyme + Holoenzyme

 d) Holoenzyme = Coenzyme + Cofactor

Q5) Amino acids have both an amino group and a carboxyl group in their structure. Which amongst the following is an amino acid?

(A) Formic acid

(B) Glycerol

(C) Glycolic acid

(D) Glycine.

Q6) A metal ion required for normal functioning of an enzyme is ... .... [ DPMT 2008] 

 a) Holoenzyme  

 b) Coenzyme  

 c) Cofactor  

 d) Prosthetic group

Q7) An amino acid under certain conditions have both positive and negative charges simultaneously in the same molecule. Such a form of amino acid is called

(A) Acidic form

(B) Basic form

(C) Aromatic form

(D) Zwitterionic form.

Q8) Excess ATP inhibits respiration by inhibiting one of the following enzymes .... .... [ JIPMER 1999 ] 

 a) Phosphofructokinase  

 b) Hexokinase  

 c) Pyruvic decarboxylase  

 d) Aldolase

Q9) The number of 'ends' in a glycogen molecule would be

(A) Equal to the number of branches plus one

(B) Equal to the number of branch points

(C) One

(D) Two, one on the left side and another on the right side.

10) Non-protein organic component of enzyme is ... ... [ AFMC 2008] 

 a) Apoenzyme  

 b) Holoenzyme  

 c) Coenzyme  

 d) Isozyme

11) The primary structure of a protein molecule has

(A) Two ends

(B) One end

(C) Three ends

(D) No ends.

12) Select the option which is not correct with respect to enzyme action :… [AIPMT 2014] 

 a) A non-competitive inhibitor binds the enzyme at a site distinct from that which binds the substrate.

 b) Malonate is a competitive inhibitor of succinic dehydrogenase.

 c) Substrate binds with enzyme at its active site.

 d) Addition of lot of succinate does not reverse the inhibition of succinic dehydrogenase by malonate.

13) Which is not true about coenzyme and prosthetic group ... .... [ AMU 2011] 

 a) Both are required for enzyme action  

 b) Both are separated from enzymes  

 c) Both are organic compounds  

 d) Both are not polypeptides

14) Which is true about enzyme ... ..... [ KCET 2011] 

 a) Apoenzyme = Holoenzyme + Coenzyme

 b) Holoenzyme - Apoenzyme + Coenzyme  

 c) Coenzyme = Apoenzyme + Holoenzyme

 d) Holoenzyme = Coenzyme - Apoenzyme

15) Molecules functioning as biocatalysts in addition to enzymes are ... .... [ AFMC 2012] 

 a) Polysaccharides  

 b) RNAs  

 c) Fatty acids  

 d) None of the above

16) Catalytic efficiency of two different enzymes is compared by their ... ..... [ CBSE 2005] 

 a) Product  

 b) Molecular size  

 c) Km value  

 d) pH optimum value

17) Nitrogen base + Pentose sugar + Phosphate group is .... .... [ AMU 2012] 

 a) Nucleoside  

 b) Nucleic acid  

 c) Pyrimidine  

 d) Nucleotide

18) Telomerase is an enzyme which is a [AIIMS 2005]

A) Simple protein

B) RNA

C) Ribonucleoprotein

D) Repetitive DNA

19) Which is not true for enzymes [AMU 2005]

A) Enzyme is a complex structure of protein

B) Enzyme can be regulated by specific molecules

C) Enzyme is more sensitive for the changes of temperature and pH

D) Enzyme functions as catalyst for various reactions

20) Inhibitory effect of melonic acid on succinic dehydrogenase enzyme is [AIIMS 2003]

A) Competitive inhibition

B) Non-competitive inhibition

C) Feedback inhibition

D) Inhibition due to end product

Anwers are below-:

 1) D)

 2) A)

 3) D)

 4)B) 

 5) D)

 6) C)

 7) D)

 8) A)

 9) D)

10) C)

11) A)

12) D)

13) B)

14) B)

15) A)

16) A)

17) D)

18) C)

19) D)

20) C) 

Keep learning the concepts and solving the MCQ.  The more you solve more will   chances of success in NEET. 

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