The final proof for DNA as the genetic material came from the experiments of

  • Griffith

  • Hershey and Chase

  • Avery, Mcleod and McCarty

  • Avery, Mcleod and McCarty


B.

Hershey and Chase

Hershey and Chase gave unequivocal proof which ended the debate between protein and DNA as genetic material.

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Antiparallel strands of a DNA molecule means that

  • one strand turns anti-clockwise

  • the phosphate groups of two DNA strands, at their ends, share the same position

  • the phosphate groups at thestart of two DNA strands are in opposite position (pole)

  • the phosphate groups at thestart of two DNA strands are in opposite position (pole)


C.

the phosphate groups at thestart of two DNA strands are in opposite position (pole)

J.D. Watson and F.H.C. Crick (1953) showed that DNA has a double helical structure with two polynucleotide chains structure with two polynucleotide chains connected by hydrogen bonds and running in opposite directions (antiparallel). The antiparallel strands of a DNA molecule means that the phosphate groups at the start of two DNA strands are in opposite position (pole).

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Amino acid sequence, in protein synthesis is decided by the sequence of

  • t-RNA

  • m-RNA

  • c-DNA

  • c-DNA


B.

m-RNA

In the process of protein synthesis, the messenger RNA (m-RNA) is responsible for carrying the genetic code transcribed from DNA to specialized sites within the cell (called ribosomes) where the information is translated into protein composition. The sequence of amino acids in a particular protein is determined by the sequence of t-RNA, c-DNA or  r-RNA do not decide the amino acid sequence in protein synthesis.

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Which of the following are not polymeric?

  • Nucleic acids

  • Proteins

  • Polysaccharides

  • Polysaccharides


D.

Polysaccharides

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One turn of the helix in a B-form DNA is approximately

  • 20 nm

  • 0.34 nm

  • 3.4 nm

  • 3.4 nm


C.

3.4 nm

B-DNA is helical structure with 20  diameter and the distance between the two base pairs is 3.4 and there are 10 base pairs in each turn or pitch (one round). Hence, one turn of the helix is approximately 34 or 3.4 nm 


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