Match List-I with List-II regarding Meselson-Stahl Experiment.
List-I (Condition)
List-II (Density Result)
A. N-15 only (Generation 0)
I. Hybrid Density only
B. After 20 mins (Gen 1) in N-14
II. Heavy Density only
C. After 40 mins (Gen 2) in N-14
III. Hybrid and Light Densities
Generation 0 in N-15 is all Heavy. Gen 1 in N-14 results in 100% Hybrid (N15-N14). Gen 2 results in 50% Hybrid and 50% Light.
Question 612 of 668
📘 CLASS XII
Match List-I with List-II regarding Replication components.
List-I (Component)
List-II (Function)
A. Single Strand Binding Proteins
I. Initiation site
B. Origin of Replication (Ori)
II. Stabilize single-stranded DNA
C. Leading Strand
III. Synthesized continuously
D. Lagging Strand
IV. Synthesized discontinuously
SSB proteins stabilize the separated strands. Ori is the start site. Leading strand is continuous. Lagging strand is discontinuous.
Question 613 of 668
📘 CLASS XII
Match List-I with List-II regarding Ribosome sites.
List-I (Site)
List-II (Function)
A. A-site
I. Holds the growing polypeptide chain
B. P-site
II. Exit site for empty tRNA
C. E-site
III. Accepts incoming Aminoacyl-tRNA
A-site (Aminoacyl) accepts new tRNA. P-site (Peptidyl) holds the chain. E-site (Exit) releases the tRNA.
Question 614 of 668
📘 CLASS XII
Match List-I with List-II regarding Lac Operon components.
List-I (Component)
List-II (Function)
A. Inducer (Lactose)
I. Binding site for Repressor
B. Repressor
II. Binding site for RNA Polymerase
C. Operator
III. Blocks transcription
D. Promoter
IV. Inactivates Repressor
Lactose induces the operon by inactivating the repressor. The Repressor blocks transcription. The Operator is where the Repressor binds. The Promoter is where RNA Polymerase binds.
Question 615 of 668
📘 CLASS XII
Match List-I with List-II regarding Mutation types.
List-I (Mutation)
List-II (Example/Description)
A. Point Mutation
I. Insertion/Deletion of base pairs
B. Frameshift Mutation
II. Sickle Cell Anemia
C. Silent Mutation
III. No change in amino acid sequence
Point mutation involves a single base change (e.g., Sickle Cell). Frameshift involves insertions/deletions shifting the reading frame. Silent mutations do not change the amino acid.
Question 616 of 668
📘 CLASS XII
Match List-I with List-II regarding DNA Fingerprinting applications.
List-I (Application)
List-II (Matching Pattern)
A. Paternity Test
I. 100% band matching
B. Crime Scene (Suspect vs Sample)
II. 50% band matching (One set of chromosomes)
In paternity tests, the child matches 50% with the father (one set). In crime scenes, the suspect DNA should match 100% with the sample if they are the source.
Question 617 of 668
📘 CLASS XII
Match List-I with List-II regarding Satellite DNA.
List-I (Type)
List-II (Feature)
A. Minisatellite
I. STRs (Short Tandem Repeats)
B. Microsatellite
II. VNTRs (Variable Number of Tandem Repeats)
C. Satellite DNA
III. Bulk of Repetitive DNA
Minisatellites correspond to VNTRs. Microsatellites correspond to STRs. Satellite DNA forms the bulk of repetitive DNA.
Question 618 of 668
📘 CLASS XII
Match List-I with List-II regarding Scientists and Years.
