Consider the following statements with respect to transcription and select the correct option stating true (T) or false (F).
A. In transcription, only a segment of DNA and only one of the strands is copied into RNA.
B. Terminator is located upstream of the structural gene.
C. The nascent RNA synthesised by RNA polymerase II is called hnRNA in eukaryotes.
D. Intervening sequences do appear in processed RNA.
Important Questions on Molecular Basis of Inheritance
To code the 50 amino acids in a polypeptide chain, what will be the minimum number of nucleotides in its cistron?
(i) Exposure of DNA strands
(ii) Synthesis of RNA primer
(iii) Activation of deoxyribonucleotides
(iv) Chain formation
(v) Base pairing
(vi) Proof reading and DNA repair
(vii) DNA polymerase attaches at "Ori" site
Select the correct sequence of DNA replication.
| Leading strand | Lagging strand | |
|---|---|---|
| (i) | It does not require DNA ligase for its growth. | DNA ligase is required for joining Okazaki fragments. |
| (ii) | Formation of the leading strand is slower. | The formation of lagging strands is quite rapid. |
| (iii) | Its template opens in direction. | Its template opens in a direction. |
| (iv) | Formation of the leading strand begins immediately at the beginning of replication. | Formation of the lagging strand begins a bit later than that of the leading strand. |
Consider the following statements regarding the transformation experiment.
A. It was performed by F. Griffith on Streptococcus pneumoniae.
B. It proved that DNA is the genetic material.
C. Avery, MacLeod, and McCarty worked to determine the biochemical nature of transforming principle.
D. DNase inhibits the transformation.
The correct statement is/are :
In eukaryotes, the regulation of gene expression occurs at the level of :
A. Transcription level.
B. Processing level.
C. Transport of ribosomal subunits from the nucleus to the cytoplasm.
D. Translation level.
Read the given statements with respect to DNA replication.
A. DNA – dependent DNA polymerase catalyses the polymerization in only one direction that is 5' – 3'.
B. In eukaryotes, the replication of DNA takes place at the M phase of the cell cycle.
C. The discontinuously synthesised fragments are later joined by the enzyme ligase.
D. Deoxyribonucleoside triphosphate serves dual purpose. In addition to acting as substrates, they provide energy for polymerization reaction during DNA replication.
How many statements are correct?
