1.

    In DNA helix presence of hydrogen bonds was first observed by?

    A

    Watson

    B

    Crick

    C

    Pauling

    D

    All

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :DNA structure, hydrogen bonds, history of science

    Related Questions

    1.

    The length of DNA in bacteriophage Ο•imes174\phi imes 174

    A

    5386  bp5386\,\,bp

    B

    48502  bp48502\,\,bp

    C

    4.6imes106bp4.6 imes {10^6}bp

    D

    3.3imes109bp3.3 imes {10^9}bp

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :Bacteriophage DNA length, Genome size

    2.

    The net electric charge on DNA and histones is?

    A

    Both positive

    B

    Both negative

    C

    Negative and Positive

    D

    Zero

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :DNA charge, Histone charge, electrostatic interaction

    3.

    Which nitrogenous base is found in DNA but NOT in RNA?

    A

    Adenine

    B

    Guanine

    C

    Cytosine

    D

    Thymine

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Easy
    ⚑ Time Required :0.5 mins
    πŸ”„Ncert Concepts :DNA, RNA, Nitrogenous bases

    4.

    Histones are crucial for DNA packaging. Which of the following is NOT a characteristic of these proteins?

    A

    Rich in basic amino acids

    B

    Positively charged

    C

    Primarily composed of carbohydrates

    D

    Synthesized mainly during S phase

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    PYQ YEAR: 2021
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :DNA packaging, Histones, Cell Cycle

    5.

    Which of the following is not relevant to the structure of double helical DNA?

    A

    Hydrogen bonds

    B

    Phosphodiester bonds

    C

    Base stacking interactions

    D

    Peptide bonds

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :DNA structure, double helix, nucleotide, deoxyribose, phosphate

    6.

    Read the following statements w.r.t. B-DNA (A) Backbone is formed by the sugar-phosphate sugar chain (B) The two strands of polynucleotides are antiparallel (C) At each step of ascent, the strand turns 360{36^0} (D) The rise per base pair would be 34 A034\,\mathop A\limits^0 How many statements are correct?

    A

    1

    B

    2

    C

    3

    D

    4

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚑ Time Required :2 mins
    πŸ”„Ncert Concepts :B-DNA structure, nucleotide structure, antiparallel strands, helical twist, base pair distance

    7.

    A nucleoside differs from a nucleotide it lacks the?

    A

    Nitrogen base

    B

    Sugar

    C

    OH group

    D

    Phosphate group

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :nucleosides, nucleotides, phosphate group, nitrogenous base, sugar

    8.

    The net electric charge on DNA and histones is?

    A

    Both positive

    B

    Both negative

    C

    Negative and Positive

    D

    Zero

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :DNA charge, Histone charge, Net charge

    9.

    DNA consists of two complementary nucleotide chains. If the sequence of nucleotides in one of the chains is AGCTTCGA then the complementary sequence of the other chain will be

    A

    TCGAAGCT

    B

    TCGTATCG

    C

    AATTCCGG

    D

    TCGAACTG

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Application
    🎯Difficulty :Easy
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :DNA structure, complementary base pairing

    10.

    Side by side experiments are conducted to identify DNA as genetic material, unequivocally by?

    A

    Griffith

    B

    O.T Avery, Mac Leod, Mc Carty

    C

    Hershy and Chase

    D

    Watson and Crick

    Question Tags
    πŸ“š Subject:Botany
    πŸ“‘ Chapter:Molecular Basis of Inheritance
    🎯Topic:Dna
    πŸŽ“ Ncert Level:Remembering
    🎯Difficulty :Medium
    ⚑ Time Required :1 mins
    πŸ”„Ncert Concepts :DNA as genetic material, scientific experiments, historical biology

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