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

 

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Identify the incorrectly matched pair:

 

Organism

Length of DNA

(1)  

Bacteriophage ϕ 174

5386 base pairs

(2)

Bacteriophage Lambda   

48502 base pairs

(3)

Eschrechia coli

4×106  base pairs

(4)

Human beings

3.3×109  base pairs

 

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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

 

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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

 

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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.

 

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A tRNA molecule must :

(1) have a base sequence identical to the codon in the mRNA

(2) be attached to a particular amino acid

(3) bind to the protein to determine its primary structure

(4) All of these

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The inducer of lac operon is :

(1) Beta galactosidase

(2) Galactose

(3) Lactose

(4) Glucose

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The creation of a DNA fingerprint would normally employ all the following techniques except :

(1) Southern blotting

(2) Use of restriction endonucleases

(3) Gel electrophoresis

(4) Western blotting

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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

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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

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