The statement 'Cell arises from pre-existing cell' (Omnis cellula-e cellula) was proposed by:

Classify the organisms on the basis of the number of cells. Give two examples each.

$(a)$ Write two points of difference between the nuclear region of a bacterial cell and the nuclear region of an animal cell.
$(b)$ Which structure present in the nuclear region of a living cell bears genes?

In the cell,complex sugars are made from simple sugars by

Which structure do the cork cells resemble as observed by Robert Hooke?

What are genes? What is their function?