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Standard XII
Biology
Nucleolus
Question

Nucleolus are rich in
  1. Deoxy Ribonucleoprotein
  2. Lipoprotein
  3. Ribonucleoprotein
  4. mRNA and rRNA

A
Lipoprotein
B
Deoxy Ribonucleoprotein
C
Ribonucleoprotein
D
mRNA and rRNA
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Solution
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The nucleolar chromatin contains the gene for rRNA and ribonucleoprotein. The nucleolus is the largest structure present in the nucleus of eukaryotic cells where it primarily serves as the site of ribosome synthesis and assembly. Nucleoli also have other important functions like the assembly of signal recognition particles and playing a role in the cell's response to stress. Nucleoli are made of proteins and RNA and form around specific chromosomal regions.

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Nucleolus are rich in
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Q3

Match the RNA polymerase types in column I with that of the product they synthesize in column II.

Column I Column II
a. RNA pol. I i. Synthesizes mRNA and hnRNA
b. RNA pol. II ii. Synthesizes tRNA , 5 srRNA, Sn RNA in nucleolus
c. RNA pol. III iii. Synthesizes rRNA (28S, 18S) in nucleolus

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Q4
Chromosomes are present inside the nucleolus.
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Q5

Which of the following are produced by the nucleolus?


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