Practice free Botany NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
Frederick Sanger is credited for the invention of
solution- Refer NCERT, heading 6.9, page-119, para 3,
The last chromosome to be sequenced in HGP was
solution- Refer NCERT, heading 6.9, page-119, para 3 last line
The locations in human genome which differ by a single base difference is known as
solution- Refer NCERT, heading 6.9, page-120 para 1, last point
The largest known human gene is
solution- Refer NCERT, heading 6.9, page-120, para 1, last point
Which of the following RNA polymerase catalyses the formation of transfer RNA in eukaryotes?
In eukaryotes, there are three RNA polymerases in the nucleus.
RNA polymerase I : transcribes rRNAs (28S, 18S, and 5.8S)
RNA polymerase II : precursor of mRNA, the heterogeneous nuclear RNA (hnRNA).
RNA polymerase III : transcription of tRNA, 5srRNA, and snRNAs
(page-111)
Out of 64 codons how many of them code for amino acids?
61 codons code for amino acids and 3 codons do not code for any
amino acids, hence they function as stop codons.
(page-112)
Circular DNA is found in:
Bacteria, chloroplast and mitochondria consists of circular DNA.
If in a DNA molecule cytosine is 18%, the percentage of adenine would be:
A + G + C + T = 100%
Because = G = 18%
A + 18% + 18% + T = 100%
A + T = 64%
as A = T
A = 32% and T = 32%
Therefore adenine would be 32%.
Isotopes used in proving semiconservative replication of DNA were:
14NH4Cl : the heavy isotope of nitrogen and 15NH4Cl were used in
semiconservative DNA replication experiment by Matthew Meselson and
Franklin Stahl in 1958.
(page-104)
Bacterial nucleoid has:
In prokaryotes, such as, E. coli, the DNA is not scattered throughout the
cell. Double-stranded DNA is held with some proteins in a region termed as
‘nucleoid’. The DNA in nucleoid is organised in large loops held by proteins.
(page-99)
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