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If there are 120 adenine molecule in abD...

If there are 120 adenine molecule in abDNA double helical structure showing 20 coils, what is the number of pyrimidine nucleotides forming three hydrogen bonds in it

A

80

B

100

C

120

D

140

Text Solution

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The correct Answer is:
a
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Knowledge Check

  • A short length of a DNA molecule contains 120 adenine and 120 cytosine bases. The total number of nucleotides in this DNA fragment is

    A
    480
    B
    120
    C
    60
    D
    240

  • Purines (Adenine and Guanine) and Pyrimidines (Cytosine and Thymine) are present in DNA in an equal ratio. Also, Purines and Pyrimidines are complementary in a polynucleotide chain. It means that the number of Adenine molecules should be equal to the number of Thymine molecules and the number of Gunanine molecules should be equal to the number of Cytosine molecules. In a given strands of DNA, the base sequence is AGTCATGAT. What will be the basic sequence of its complementary strand.

    A
    AGTCATGCT
    B
    AGTCATGAT
    C
    TCAGTACTA
    D
    AGTGATGAT

  • There are 20% adenine among the bases in a DNA fragment measuring 6.8 nm in length. The number of pentose sugars, nitrogen base pairs, phosphate groups and hydrogen bonds in this DNA fragment are respectively

    A
    52,20,20,40
    B
    40,52,40,20
    C
    20,40,52,40
    D
    40,20,40,52

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    Nucleic acids are the biopolymers in which the repeating structural monomeric units is a nucleotide. The nucleotides structural monomeric unit is a nucleotide. The nucleotides consist of three components, a pentose sugar (D-(0)-" ribose or 2 - deoxy "-D-(-)-"ribose, heterocyclic base") , (purines i.e., adenine and guanine and pyrididines i.e., thymine, cytosine and uracil) and phosphoric acid. Sugar - base constitutes nucleosides. the two types of nucleic acids are DNA and RNA. Nucleic acids play significant role in replication and protein synthesis. What type of linkage hold together monomers of DNA?

    Read the below Statements about the structure of genetic material and identify the correct ones. I. Adenine and guanine are bases that have a double ring structure , cytosine, thymine and uracil are based with a single ring structure . II. An adenine nucleotide from DNA is the same as an adenine nucleotide from RNA , DNA adenine pairs with uracil and RNA adenine pairs with thymine. III. The base pairing that occurs in a double DNA helix and when RNA is synthesised during transcription follows the rule that a purine pairs with a pyrimidine. IV. The two Polynucleotides on a DNA molecule run in opposite directions so that the double helix formed has two strands that are parallel to each other.

    In double helix model of DNA, the number of hydrogen bonds formed between guanine and cytosine is

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