Multiple Choice QuestionsIn the lactose operon of Escherichia coli what is the function of promoter
Binding of Gyrase enzyme
Binding of RNA polymerase
Codes for RNA polymerase
Processing of messenger RNA
Number of nitrogenous bases in a codon is
3
2
1
5
A.
3
The codon is set of 3 pairs of nitrogen bases. Three bases actually code for an amino acid but the DNA requires that the three bases that are doing the coding are linked to their pair. A-T, T-A, G-C. C-G.
So it takes six nitrogen bases to code for one amino acid. So a codon codes for an amino acid and requires a total of six nitrogen bases.
Chromosomes can be stained with one of the following chemicals
acetocarmine
safranine
light green
eosin
In a DNA molecule, distance between two bases is
2 nm/ 20 Å
0.2 nm/ 2 Å
3.4 nm/ 34 Å
0.34 nm/ 3.4 Å
Balbiani rings are the sites of
DNA replication
RNA and protein synthesis
synthesis of lipids
synthesis of polysaccharides
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