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A:it is called a selectively permeable membrane because it allows the entry and exit of some substances, not all.
Q. differentiate between prokaryotic cell and eukaryotic cell?
A: prokaryotic cell:
- Size: generally small (1-10um) (1um = 10-6m)
-Nuclear region is poorly defined due to absence of a nuclear membrane and known as nucleoid.
-There is a single chromosome.
-Membrane-bound cell organelles absent.
eukaryotic cell:
-Size: generally large (5-100um)
-Nuclear region well defined and surrounded by a nuclear membrane.
-There are morre than one chromosomes.
-Membrane-bound cell organelles present.
Q. name two organelles which contain their own genetic material?
A: 1. mitochondria 2. plastids
Q. why are lysosomes known as suicide bags?
A: when the cell gets damaged, lysosomes may burst, and the enzymes digest their own cell. therefore lysosomes are known as suicide bags.
Q. where are proteins synthesised inside the cell?
A:
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