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STD 11 - 9. Biomolecules — BIOLOGY STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceBIOLOGYSTD 11 - 9. Biomolecules1 Mark
MCQ
The pitch of the $B-DNA$ is
  • A
    $36\; Å$
  • B
    $3.4 \;Å$
  • ✓
    $34\; Å$
  • D
    $3.6\; Å$
✓

Answer

Correct option: C.
$34\; Å$
c
In $B-DNA$, one turn of helical strand has $10$ nucleotides.
The base pairs of $DNA$ are stacked $3.4 \;Å$ part.
$\therefore$  Pitch of the $DNA = 3.4\; Å × 10 = 34\; Å$

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