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Two strands of double helical model of D...

Two strands of double helical model of DNA are held together by H- bonds between `:`

A

nitrogen bases

B

phosphoric acid

C

sugar and phosphate

D

nitrogen and sugar

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The correct Answer is:
A
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The two strands of DNA are held together by :

The pairs of bases in DNA are held together by

The double helix model of DNA was proposed by

Double helical model of DNA molecule was proposed by :

Assertion : The nitrogen bases of the two chains of DNA are held together by hydrogen bonds. Reason : Both chains of DNA are anitparallel.

Read the following statements and find out the incorrect statements. a. The length of DNA is usually defined as number of nucleotides or base pairs present in it. b. In DNA, every nucleotide residue has an additional -OH group present at 2' -position in the deoxyribose. c. Nuclein was discovered and named by Friedrich Meisher in 1969. d. Adenine pair with Thymine and Guanine with Cytosine through H-bonds. This makes one strand complementary to the other. e. the proposition of double helical model of DNA was also based on the observation of Erwin Chargaff.

GRB PUBLICATION-THE GENETIC MATERIAL-DNA
  1. Assertion (A) : Adenine cannot pair with cytosine. Reason ® : Becaus...

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  2. The two strands of DNA are held together by :

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  3. Two strands of double helical model of DNA are held together by H- bon...

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  4. Double hydrogen bonds occur in DNA between :

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  5. Hydrogen bonds between cytosine and guanine are :

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  6. If a highly purified sample of plant DNA is dissolved in distilled wat...

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  7. The acidic characters of DNA and RNA are due to :

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  8. In 3.2 Kbp long piece of DNA, 820 adenine bases were found. What would...

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  9. Match the following :

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  10. Which of the following scientists demonstrated that in DNA, A=T and G=...

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  11. DNA has equal number of adenine and thymine residues (A=T) and equal n...

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  12. According to the Chargaff's law :

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  13. Which of the following is correct according to Chargaff's rules ?

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  14. Which one is not ture ?

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  15. Which is false ?

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  16. Who gave the concept that for a double stranded DNA the ratio between ...

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  17. The following ratio is generally constant for a given species :

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  18. What would be the percentage of thymine in a double stranded DNA sampl...

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  19. If the total amount of adenine and thymine in a double-stranded DNA is...

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  20. What will be the percentage of guanine in a DNA molecule having 20% ad...

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