If a DNA sample has 20% Adenine, what is the percentage of Cytosine?
According to Chargaff’s rule, A=T and G=C. If A=20%, then T=20%. A+T=40%. The remaining 60% must be G+C. Since G=C, Cytosine will be half of 60%, which is 30%.
Question 82 of 668
📘 CLASS XII
The core enzyme of RNA polymerase requires which factor for termination?
While the Sigma factor is needed for initiation, the Rho factor binds to the RNA polymerase to terminate the transcription process in prokaryotes.
Question 83 of 668
📘 CLASS XII
Which of the following is true for the genetic code?
The genetic code is nearly universal, meaning a specific codon codes for the same amino acid in almost all organisms, from bacteria to humans, with very few exceptions (e.g., in mitochondria).
Question 84 of 668
📘 CLASS XII
Which scientist proposed the Double Helix model of DNA?
James Watson and Francis Crick proposed the famous double helix model of DNA structure in 1953, utilizing X-ray diffraction data produced by Maurice Wilkins and Rosalind Franklin.
Question 85 of 668
📘 CLASS XII
How many base pairs are present in a typical nucleosome?
A nucleosome core particle plus the linker DNA associated with it typically comprises about 200 base pairs of DNA.
Question 86 of 668
📘 CLASS XII
In a polyribosome (polysome), multiple ribosomes are attached to?
A polysome consists of several ribosomes translating a single mRNA strand simultaneously. This increases the efficiency of protein synthesis, producing multiple copies of the protein from one template.
Question 87 of 668
📘 CLASS XII
The DNA dependent DNA polymerase catalyzes polymerization in?
All known DNA polymerases synthesize DNA in the 5-prime to 3-prime direction, adding nucleotides to the 3-prime end of the growing strand.
Question 88 of 668
📘 CLASS XII
Identify the palindromic sequence used by restriction enzymes.
A palindromic sequence reads the same forwards and backwards on complementary strands. 5-GAATTC-3 is the recognition site for EcoRI, and its complement read 5 to 3 is also GAATTC.
Question 89 of 668
📘 CLASS XII
The distance between two consecutive base pairs in DNA is?
The rise per base pair in B-DNA is 0.34 nanometers. This is derived from the pitch of the helix (3.4 nm) divided by the number of base pairs per turn (10).
Question 90 of 668
📘 CLASS XII
Which carbon of the pentose sugar carries the OH group in RNA but not in DNA?
The sugar in RNA is ribose, which has a hydroxyl (-OH) group at the 2-prime position. In DNA (deoxyribose), this oxygen is missing, leaving just a hydrogen, which contributes to DNA`s stability.
