Question

19. Nucleus are absent in
a) Red blood cells and bacterium
b) Red blood cells, sieve cells and
bacterium
c) Red blood cells only
d) none of these​

Answer 1

Explanation:

Nucleus is absent in bacteriae. That is their genetic material is not enclosed by the nucleus (They are called prokaryotes, because not only do they not have nucleus but also other membrane bound organelles, making them primitive life forms). ... Platelets although cell fragments lack a nucleus.