An enzyme which synthesis, DNA from RNA is called?
A.
DNA polymerase
B.
RNA polymerase
C.
Nucleases
D.
Reverse transcriptase
Answer: Option D
Explanation:
Reverse transcriptase was discovered by Howard Temin at the University of Wisconsin, also known as RNA directed DNA polymerase which synthesis DNA from RNA.
Name the bacterium from which Taq DNA polymerase derived?
A.
Thermus aquaticus
B.
Salmonella
C.
Cyanobacteria
D.
E.coli
Answer: Option A
Explanation:
Taq polymerase derived from thermostable bacteria called thermus aquaticus.it is basically used in PCR and have the ability to withstand with 90°C temperature.
Name the enzyme which degrades DNA molecule by breaking its phosphodiester bonds?
A.
DNA polymerase
B.
Nucleases
C.
Ligase
D.
Reverse transcriptase
Answer: Option B
Explanation:
Nucleases are the enzymes which break phosphodiester bonds of DNA that link one nucleotide to another. Nucleases are of two types i.e., endonucleases and exonucleases.
Endonuclease are those which break internal phosphodiester bonds of DNA while exonuclease removes nucleotide from the end of the DNA. Examples: mung bean nuclease, S1 nuclease, Rnase A, and RNase H.
