Select the correct option:

 

Direction of RNA synthesis

Direction of reading of the template DNA strand

(a)

5’ − 3’

3’ − 5’

(b)

3’ − 5’

5’ − 3’

(c)

5’ − 3’

5’ − 3’

(d)

3’ − 5’

3’ − 5’

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Escherichia coli cells were grown for many generations in 15NH4Cl as sole nitrogen source. Subsequently, these cells were grown exactly for four generations in medium containing 14NH4Cl. The DNA from these cells were isolated and separated. If 15N/15N represents the two strands of DNA where both strands have heavy nitrogen; 15N/14N as intermediate DNA; and 14N/14N as DNA containing light nitrogen, the ratios for heavy: intermediate: light DNA, respectively would be:

(a) 1 : 0 : 7          (b) 1 : 1 : 6          (c) 0 : 1 : 7           (d) 0 : 8 : 0

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The length of E. coli DNA and length of DNA in a human 2N cell is:

(a) 1.36 mm and 2.2 m respectively   (b) 1.36 mm and 2.2 mm respectively

(c) 1.3 ìm and 2.2 ìm respectively     (d) 1.36 cm and 2.2 cm respectively

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SNP which is pronounced as "snips” stands for:

(a) Small nuclear protein                    (b) Single nucleotide particle

(c) Single nucleotide polymorphism    (d) Small nicking points

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Western Blot hybridization is used for:

(a) DNA analysis                                (b) RNA analysis

(c) Protein analysis                             (d) Polysaccharide analysis

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Which statement about complementary base pairing is not true?
(a) It plays a role in DNA replication
(b) In DNA, T pairs with A
(c) Purines pair with purines, and pyrimidines pair with pyrimidines
(d) In DNA, C pairs with G

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What are the mini-satellites?

(a) r-DNA              (b) VNTR               (c) c-DNA              (d) SAT

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Experiments by Avery, Macleod, and McCarty supported DNA as the genetic material by showing that:
(a) Both protein and DNA samples provided the transforming factor
(b) DNA was not complex enough to be the genetic material
(c) Only samples with DNA provided transforming activity
(d) Even though DNA was molecularly simple, it provided adequate variation to act as the genetic material

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If Hershey and Chase had found 'S in both the pellet and the supernatant, the conclusion about the nature of DNA replication would be that:
(a) Protein must be the information molecule
(b) It would be difficult to conclude anything from these results
(c) DNA is the genetic information molecule
(d) Phage must have stuck to the bacteria

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The enzyme that unwind the DNA prior to replication is called:

(a) DNA polymerase III                       (b) DNA ligase

(c) Primase                                        (d) Helicase

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