A pairs with T via 2 H-bonds. G pairs with C via 3 H-bonds.
Question 645 of 668
📘 CLASS XII
Match List-I with List-II regarding DNA Replication Speed.
List-I (Parameter)
List-II (Value in E. coli)
A. Replication time
I. ~18-20 minutes
B. Rate of polymerization
II. 2000 bp per second
E. coli replicates in ~18-20 mins (division time 20 min). The polymerase works at ~2000 bp/sec.
Question 646 of 668
📘 CLASS XII
Match List-I with List-II regarding Polymerase Specificity.
List-I (Enzyme)
List-II (Template -> Product)
A. DNA dependent DNA polymerase
I. DNA -> DNA
B. DNA dependent RNA polymerase
II. DNA -> RNA
C. Reverse Transcriptase
III. RNA -> DNA
DNA pol makes DNA from DNA. RNA pol makes RNA from DNA. Reverse transcriptase makes DNA from RNA.
Question 647 of 668
📘 CLASS XII
Match List-I with List-II regarding Genetic Code Wobble.
List-I (Position)
List-II (Feature)
A. Third base of codon
I. Wobble position (less specific)
B. First two bases
II. Highly specific
The third base is often the wobble base, allowing degeneracy where changes often don't alter the amino acid.
Question 648 of 668
📘 CLASS XII
Match List-I with List-II regarding Sickle Cell Anemia.
List-I (Change)
List-II (Result)
A. DNA Sequence
I. GAG to GUG
B. Amino Acid
II. Glutamic Acid to Valine
In Sickle Cell Anemia, the DNA/RNA codon changes from GAG to GUG, causing Glutamic Acid to be replaced by Valine.
Question 649 of 668
📘 CLASS XII
Match List-I with List-II regarding the Lac Operon genes and their products.
List-I (Gene)
List-II (Product)
A. z gene
I. Repressor protein
B. y gene
II. Transacetylase
C. a gene
III. Beta-galactosidase
D. i gene
IV. Permease
In the Lac Operon: The z gene codes for Beta-galactosidase, which hydrolyzes lactose. The y gene codes for Permease, which increases the permeability of the cell to lactose. The a gene codes for Transacetylase. The i gene (inhibitor) codes for the Repressor protein,.
Question 650 of 668
📘 CLASS XII
Match List-I with List-II regarding methodologies used in the Human Genome Project (HGP).
List-I (Term)
List-II (Description)
A. ESTs (Expressed Sequence Tags)
I. Vectors for cloning large DNA fragments
B. Sequence Annotation
II. Sequencing only genes expressed as RNA
C. BAC and YAC
III. Principle used for automated sequencing
D. Sanger Method
IV. Sequencing whole genome (coding & non-coding)
ESTs involve sequencing only those genes that are expressed as RNA. Sequence Annotation is the blind approach of sequencing the whole genome (coding and non-coding) and then assigning functions. BAC (Bacterial Artificial Chromosome) and YAC (Yeast Artificial Chromosome) are vectors used for cloning. The Sanger Method is the principle behind automated DNA sequencing,,,.
