Chromatids are associated with which of the following?

Discuss briefly the role of the nucleolus in cells actively involved in protein synthesis.

Robert Brown is well known for the discovery of . . . . . . .

Which of the following organelles contains genetic material?

Read the following statements $:-$
$(i)$ Centromere is present in the middle of the chromosomes and forms two equal arms.
$(ii)$ Chromosome has a terminal centromere.
$(iii)$ Centromere lies close to the end of the chromosome forming one extremely short and one very long arm.
$(iv)$ Centromere lies slightly away from the middle of the chromosome resulting in one shorter arm and one longer arm.
Select the correct option as per the codes given below $:-$

$DNA$ is mainly found in