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STD 12 - 5. molecular basis of inheritance — BIOLOGY STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 ScienceBIOLOGYSTD 12 - 5. molecular basis of inheritance1 Mark
MCQ
Antiparallel strands of a $DNA$ molecule means that
  • A
    one strand turns clockwise
  • B
    one strand turns anti­clockwise
  • C
    the phosphate groups of two $DNA$ strands, at their ends, share the same position
  • ✓
    the phosphate groups at the start of two $DNA$ strands are in opposite position (pole).
✓

Answer

Correct option: D.
the phosphate groups at the start of two $DNA$ strands are in opposite position (pole).
d
(d) : $DNA$ is a type of nucleic acid that forms genetic material in many organisms. It consists of a long polymer of nucleotides which transcribes the coded information in the form of a triplet code of nucleotides in $mRNA$. It is a double helical molecule. The two strands of $DNA$ run in opposite directions to one another with the hydrogen bonds between them. One strand of $DNA$ has $5'­3'$ direction and the other strand has $3'­5' $ direction. So they are antiparallel. This direction is determined by the presence of a free phosphate or $OH$ group at the end of the strand. If the strand has phosphate group at the the $5'$ end and with a free $OH$ group at the $3'$ end.

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