In the given figure,what do $a$ and $b$ represent respectively?

Which of the following is true for a cell that is actively synthesizing proteins in large quantities?

Which of the following animal cells lacks a nucleus?

Chromatin contains:

Which of the following is not contained in a eukaryotic nucleus?

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 $:-$