Class 12 Chemistry Chapter 14 Biomolecules Multiple Choice Questions (MCQs) and Answers | Class 12 Chemistry Chapter 14 Biomolecules Quiz

Questions

1 Which of the following is corect about H-bonding in nucleotides ?

A A-T, G-C

B A-G, T-C

C G-T, A-C

D A-A, T-T

Answer:A-T, G-C

2 During the process of digestion, the proteins present in food materials are hydrolysed to amino acids. The two enzymes involved in the process

are respectively

A amylase and maltase

B diastase and lipase

C pepsin and trypsin

D invertase and zymase

View Answer

Answer: pepsin and trypsin

3 As far as the absorbance of DNA at 260nm. Which of the following is correct?

A individual nucleotides>ss DNA>dsDNA

B dsDNA>ssDNA> individual nucleotides

C ssDNA>dsDNA> individual nucleotides

D absorbance remains same

View Answer

Answer:individual nucleotides>ss DNA>dsDNA

4 Which of the following statement is true?

A DNA is more stable than RNA in alkaline condition because of the presence of 3’OH

B DNA is more stable than RNA in alkaline condition because of the presence of 2’ H compared to RNAs 2’OH

C RNA is more stable than DNA in alkaline condition because of the presence of 2’ and 3’OH compared to DNAs 2’H and 3’OH

D Both are equally stable in alkaline condition

View Answer

Answer:DNA is more stable than RNA in alkaline condition because of the presence of 2’ H compared to RNAs 2’OH

5 Dehydration of DNA samples may induce the formation of

A A-DNA

B B-DNA

C Z-DNA

D H-DNA

View Answer

Answer: A-DNA

6 An increase in temperature of a DNA sample causes change in

A absorbance at 260nm

B viscosity

C phosphodiester linkage

D absorbance and viscosity

View Answer

Answer:absorbance and viscosity

7 RNA-DNA hybrids are

A more stable than DNA-DNA hybrid

B more stable than RNA-RNA hybrid

C less stable than RNA-RNA hybrid

D less stable than RNA-RNA hybrid and DNA-DNA hybrid

View Answer

Answer: less stable than RNA-RNA hybrid and DNA-DNA hybrid

8 An increase Tm (melting temperature) for a ds-DNA may be due to high content of

A A+G

B A+T

C C+G

D none of the above

View Answer

Answer:C+G

9 Thymine is present in

A prokaryotic mRNA

B mammalian mRNA

C ribosomal RNA

D tRNA

View Answer

Answer:tRNA

10 RNA is genetic material in

A some virusus and prokaryotes

B some viruses only

C some virusus, prokaryotes and some primitive eukaryotes

D none of the above

View Answer

Answer:some virusus and prokaryotes

11 DNA has

A autocatalytic function

B heterocatalytic function

C both autocatalytic and heterocatalytic function

D none of the above

View Answer

Answer:both autocatalytic and heterocatalytic function

12 A nucleoside is composed of

A a base+ a sugar

B a base+ a sugar+ phosphate

C a base+ a phosphate

D none of these

View Answer

Answer:a base+ a sugar

13 Genetic mutation occurs in

A Protein

B RNA

C DNA

D Nucleus

View Answer

Answer:DNA

14 DNA is present in

A nucleus only

B nucleus, mitochondria and ER

C nucleus, mitochondria and choloroplast

D nucleus, mitochondria and RER

View Answer

Answer:nucleus, mitochondria and choloroplast

15 DNA is the genetic material in

A viruses, prokaryote and eukaryote

B prokaryote and eukaryote

C only in eukaryotes

D in some viruses, prokaryotes and eukaryotes

View Answer

Answer:in some viruses, prokaryotes and eukaryotes

16 The two strands in a DNA double is joined by

dna

A Co-valent bond

B Hydrogen bond

C ionic bond

D phosphodiester bond

View Answer

Answer:Hydrogen bond

17 Chromatin is composed of

A nucleic acids and protein

B nucleic acids only

C proteins only

D none of these

View Answer

Answer:nucleic acids and protein

18 The basic repeating units of a DNA molecule is

A nucleoside

B nucleotide

C histones

D aminoacids

View Answer

Answer:nucleotide

19 Adjacent nucleotides are joined by

A covalent bond

B phosphodiester bond

C ionic bond

D peptide bond

View Answer

Answer:phosphodiester bond

20 The length of one turn of DNA is

A 3.4 Ao

B 34 Ao

C 20 Ao

D 3.04 Ao

View Answer

Answer:34 Ao

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