MCQ
Which is wrong about nucleic acids?
- A$\text{DNA}$ is single stranded in some viruses.
- B$\text{RNA}$ is double stranded occasionally.
- ✓Length of one helix is $45 \mathring A$ in $\text{B-DNA.}$
- DOne turn of $\text{Z-DNA}$ has $12$ bases.
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$(a)$ In roots, xylem and phloem in a vascular bundle are arranged in an alternate manner along the different radii.
$(b)$ Conjoint closed vascular bundles do not possess cambium
$(c)$ In open vascular bundles, cambium is present in between xylem and phloem
$(d)$ The vascular bundles of dicotyledonous stem possess endarch protoxylem
$(e)$ In monocotyledonous root, usually there are more than six xylem bundles present.
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