3. Write about the structure and functions of nucleus.
Answers
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Explanation:
Nucleus a cell organelle was 1st described by Robert brown (1831)
CHROMATIN
the interphase nucleus has highly extended elaborate nucleoprotein fibers called CHROMATIN NUCLEAR
nuclear matrix one or more spherical bodies called NECLEOLI
nuclear envelope which consists of two parallel membrane with a space between (10-50mm) called perinuclear space
FUNCTIONS
Barrier space between materials present inside the nucleus and that of cytoplasm.
outer membrane continues with endoplasmic reticulum. and also bears ribosomes.
NUCLEAR PORE
number of places the nuclear envelope is interrupted by minute pores.
nuclear pores are the passage through which movement of RNA and protei molecules takes place.
Distance between nucleus and cytoplasm.
NUCLEOPLASM
the nuclear matrix or the nucleoplasm contains NUCLEOIUS and CHROMATIN.
the nucleoli spherical structures present in nucleoplasm.
content of nucleolus is continuous with the rest of the nucleoplasm.
it is not a membrane bound structure.