To form a nucleoside, a nitrogenous base is linked to a pentose sugar:

(1) Through a P-Glycosidic linkage at carbon atom number 1

(2) Through a P-Glycosidic linkage at carbon atom number 5

(3) Through a N-Glycosidic linkage at carbon atom number 1

(4) Through a N-Glycosidic linkage at carbon atom number 5

 

Subtopic:  The DNA |
 72%
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Identify the incorrectly matched pair:

 

Organism

Length of DNA

(1)  

Bacteriophage ϕ 174

5386 nucleotides

(2)

Bacteriophage Lambda   

48502 base pairs

(3)

Eschrechia coli

4×106  base pairs

(4)

Human beings

3.3×109  base pairs

 

Subtopic:  Solved Problems |
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The amino acid acceptor arm of the tRNA is at its:

(1) DHU loop

(2) TψC loop

(3) 5' end

(4) 3' end

 

Subtopic:  Translation |
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Which of the following codons has a dual role in the genetic code?

(1) AUG

(2) GUG

(3) CUG

(4) UUG

 

Subtopic:  Genetic Code |
 90%
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What is the major difference between the lagging and leading strands during DNA replication ?

1. On the leading strand, DNA synthesis occurs from 5' to 3', while DNA synthesis occurs from 3' to 5' on the lagging strand.

2. DNA polymerase is able to continuously add new nucleotides on the leading strand while it must keep 'starting over' on the lagging strand.

3. The lagging strand requires only a single primer while the leading strand requires many.

4. Helicase opens the leading stran at a faster rate than the lagging strand.

 

Subtopic:  DNA Replication:III | DNA Replication |
 54%
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The inducer of lac operon is :

1. Beta galactosidase

2. Galactose

3. Lactose

4. Glucose

Subtopic:  Gene Regulation: Lac Operon |
 83%
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regulatory domains of most activators interact with

1. the transcription factor complex

2. RNA polymerase

3. repressors

4. the DNA binding domain

Subtopic:  Transcription: IV | Transcription |
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DNA chemically is less reactive and structurally more stable than RNA. Therefore,

1. DNA has evolved from the RNA

2. RNA can directly code for proteins

3. DNA is the better genetic material than RNA

4. The protein synthesizing machinery has evolved around RNA

Subtopic:  DNA vs RNA as Genetic Material |
 80%
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A transcription unit does not contain:

1. A promoter

2. The structural gene

3. A terminator

4. An operator

Subtopic:  Transcription:II | Transcription |
 83%
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Regulation of lac operon by repressor is referred to as:

1. Inducible regulation

2. Repressible regulation

3. Negative regulation

4. Positive regulation

Subtopic:  Gene Regulation: Lac Operon |
 70%
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