Multiple Choice QuestionsPolymase is formed by
several ribosomes attached to a single mRNA
many ribosomes attached to a strand of endoplasmic reticulum
a ribosome with several subunits
a ribosome with several subunits
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 the DNA molecule
the total amount of purine nucleotides and pyrimidine nucleotides is not always equal
there are two strands, which run parallel in the 5' →3' direction
the proportion of adenine in relation to thymine varies with organism
the proportion of adenine in relation to thymine varies with organism
Which one of the following pairs of nitrogenous bases of nucleic acids, is wrongly matched with the category mentioned against it?
Thymine, Uracil - Pyrimidines
Uracil, Cytosine - Pyrimidines
Guanine, Adenine - Purines
Guanine, Adenine - Purines
Cry-I endotoxins obtained from Bacillus thringiensis are effective against
mosquitoes
flies
nematodes
nematodes
What is antissense technology?
A cell displaying a foreign antigen used for synthesis of antigens
Production of somaclonal variants in tissue cultures.
When a piece of RNA that is complementary to sequence is used to stop expression of a specific gene.
When a piece of RNA that is complementary to sequence is used to stop expression of a specific gene.
The linking of antibiotic resistance gene with the plasmid vector became possible with
DNA ligase
endonucleases
DNA polymerase
DNA polymerase
Telomere repetitive DNA sequences control the function of eukaryotic chromosomes because they
act as replicons.
are RNA transcription initiator
help chromosome pairing
help chromosome pairing
Molecular basis of organ differentiation dpends on the modulation in transcription by
RNA polymerase
ribosome
transcription factor
transcription factor
During transcription, RNA polymerase holoenzyme binds to a gene promoter and assumes a saddle-like structure, what is it’s DNA-binding sequence?
TTAA
AATT
CACC
CACC
Differentiation of organs and tissues in a developing organism, is associated with
developmental mutations
differential expression of genes
lethal mutations
lethal mutations
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