Molecular Biology

1. Which 3 codons are nonsense codons?

UAA, UAU, UUA

UGA, UAG, UAA

UGG, UGA, UAU

UGG,UAA,UAG

2. Lac Operon is an Example of

Only Positive Regulation

Only Negative Regulation

Both Positive and Negative Regulation

Sometimes Positive sometimes Negative

3. The rate of DNA replication by DNA polymerase is

2000 nucleotides / sec

1000 nucleotides / sec

150 nucleotides / sec

1050 nucleotides / sec

4. In which Typical Stage are Lampbrush Chromosomes Observed?

Meiotic Prophase

Mitotic Metaphase

Mitotic Prophase

Mitotic anaphase

5. A Specialized Transducing Phage that attacks an infected Cell with Lysogenic Stage of the same Virus Produces

HFT

HFR

F

F`

6. Nucleoproteíns are Synthesised in

Cytoplasm

Nucleoplasm

Nuclear Envelope

Nucleolus

7. DNA contains

Purines (A and G) pyrimidines (U and (c)

Purines (T and (c) pyrimidines (A and G)

Purines (A and (c) pyrimidines (U and G)

Purines (A and G) pyrimidines (T and (c)

8. Methionine is specified by

Stop codon

AUG

Start codon

Both B and C

9. This Has the Largest Number of Chromosomes

Pisum Sativum

Giant Redwood Tree

Haplopappus Gracilis

Ophioglossum Reticulatum

10. This Condition in Lac Operon Facilitates the Condition of Lac Genes being Transcribed at High Levels

Low Glucose, High Lactose

Low Glucose, Low Lactose

High Glucose, High Lactose

High Glucose, Low Lactose

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