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Molecular Basis of Inheritance

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Polymase is formed by

  • several ribosomes attached to a single mRNA

  • many ribosomes attached to a strand of endoplasmic reticulum

  • a ribosome with several subunits

  • ribosomes attached to each other in a linear arrangement


A.

several ribosomes attached to a single mRNA

In prokaryotes, ribosomes attach to the 5 end of mRNA as soon as transcription begins. A bunch of ribosome moves along a single m RNA molecules adding 15 amino acids second to the polypeptide chain, almost the same speed at which RNA polymerase transcribes the mRNA. The group of ribosomes together with single mRNA molecules, they are translating is called polysome. The use of polysomes si advantageous to a cell since the overall rate of protein synthesis is increased compared to the rate that would occur if there were no polysomes.

In eukaryotic cells, the ribosomes are attached to rough endoplasmic reticulum by ribophorin protein.Electron microscopy reveals that membranes of homogenised reveal that membranes of homogenised endoplasmic reticulum disrupt to form closed vesicles called microsomes.

In prokaryotes, ribosomes attach to the 5 end of mRNA as soon as transcription begins. A bunch of ribosome moves along a single m RNA molecules adding 15 amino acids second to the polypeptide chain, almost the same speed at which RNA polymerase transcribes the mRNA. The group of ribosomes together with single mRNA molecules, they are translating is called polysome. The use of polysomes si advantageous to a cell since the overall rate of protein synthesis is increased compared to the rate that would occur if there were no polysomes.

In eukaryotic cells, the ribosomes are attached to rough endoplasmic reticulum by ribophorin protein.Electron microscopy reveals that membranes of homogenised reveal that membranes of homogenised endoplasmic reticulum disrupt to form closed vesicles called microsomes.

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List the function of RNA.

Functions of RNA
RNA acts as genetic material in viruses
It also functions as an adapter and messenger 
It also acts as a catalytic molecule and catalyses various biochemical reactions.
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List the number of base pairs in :

(i) lambda bacteriophage

(ii) E.coli and

(iii) haploid content of human DNA.


(i) 48502 bp
(ii) 4.6 x 106 bp and
(iii) 3.3 x 109 bp.
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Name the genetic material for majority of organisms.

DNA (Deoxyribose nucleic acid)
965 Views . 8 Shares

How many nucleotides are present in a bacteriophage ϕ x 174.

5386
805 Views . 6 Shares

Comment two chains of DNA have antiparallel polarity.

The Two chain of DNA are antiparallel that is
if one chain has 5’ x 3’ polarity the other chain has 3’ x 5’ polarity.
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