parts of a cell

Question 1

nuclear envelope

Answer 1

double membrane
outer membrane continuous with endoplasmic reticulum
controls what goes in and out of nucleus
ribsomoes on outside
reactions take place within

Question 2

nuclear pores

Answer 2

allow passage of large molecules
300 pores in each nucleus
40-100 nm diameter

Question 3

nucleoplasm

Answer 3

double membrane granular jelly like material- most of nucleus

Question 4

chromosomes

Answer 4

protein bound, linear DNA

Question 5

nucleolus

Answer 5

small spherical region within nucleoplasm
more than one
manufactures ribosomal RNA and assembles ribosomes

Question 6

nucleus functions

Answer 6

act as control centre of cell through mRNA and tRNA and hence proien synthesis
retain genetic material in form of DNA and chromosomes
manufacture ribosomal RNA and ribosomes