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Biomolecules MCQs | Biomolecules Short Questions and Answers

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Free download in PDF Biomolecules Short Questions and Answers for competitive exams. These short objective type questions with answers are very important for Board exams as well as competitive exams. These short solved questions or quizzes are provided by Gkseries./p>

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(1) The backbone of DNA is
[A] hydrophilic
[B] hydrophobic
[C] nuetral
[D] Both hydrophilic and hydrophobic
Answer: hydrophilic
(2) Which is the most stable form of DNA under normal physiological conditions
[A] A-DNA
[B] B-DNA
[C] Z-DNA
[D] H-DNA
Answer: B-DNA
(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
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
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
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
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
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
Answer: C+G
(9) Thymine is present in
[A] prokaryotic mRNA
[B] mammalian mRNA
[C] ribosomal RNA
[D] tRNA
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
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
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
Answer: a base+ a sugar
(13) Genetic mutation occurs in
[A] Protein
[B] RNA
[C] DNA
[D] Nucleus
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
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
Answer: in some viruses, prokaryotes and eukaryotes
(16) The two strands in a DNA double is joined by

[A] Co-valent bond
[B] Hydrogen bond
[C] ionic bond
[D] phosphodiester bond
Answer: Hydrogen bond
(17) Chromatin is composed of
[A] nucleic acids and protein
[B] nucleic acids only
[C] proteins only
[D] none of these
Answer: nucleic acids and protein
(18) The basic repeating units of a DNA molecule is
[A] nucleoside
[B] nucleotide
[C] histones
[D] aminoacids
Answer: nucleotide
(19) Adjacent nucleotides are joined by
[A] covalent bond
[B] phosphodiester bond
[C] ionic bond
[D] peptide bond
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
Answer: 34 Ao

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