Question

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

CBSE Class IX Science SA 2 (3 Marks)

Answer 1

(a)

S.
No.    Nuclear region of a bacterial cell    Nuclear region of an animal cell

(i)      Poorly defined and lacks any          Well defined and membrane                           covering.                                           bound.

(ii)      Has single chromosome.               Has more than one chromosome.

(iii)    Lacks true organelles.                    Well defined membrane bound cell                                                                  organelles present.

(b)  Chromosomes bear 'genes'.

Answer 2

Nuclear region of bacteria :

• They are void of any membrane

• They have free RNA and nucleic acid

•Called Nucloid

Nuclear region of animal cell :

• They have well bounded membrane

• They have proper nucleus

•Called as Nucleus only.