Which one of the following is a reorganization site for restriction enzymeBam HI?

• 5ʹ– GAATTC – 3ʹ 3ʹ – CTTAAG – 5ʹ

• 5ʹ – GGATCC – 3ʹ 5ʹ – CCATGG – 3ʹ

• 5ʹ – GGATCC -– 3ʹ 3ʹ – CCTAGG – 5ʹ

• 5ʹ– GAATTC – 3ʹ 5ʹ– GTTAAC – 3

Which one of the following pair is not correct?

• Mangolian idiocy – 21st chromosome

• Patau syndrome – 13th chromosome

• Cri-Du-Chat – 11th chromosome

• Edward syndrome – 18th chromosome

Which one of the following pair is not correct?

• Single-stranded DNA

• Single-stranded RNA

• Double-stranded DNA

• None of the above

Consider these sentences regarding to the structure and nature of DNA.

(I) DNA has tow pyrimidine bases which contain single ring structure.

(II) In DNA, the composition of bases should be $\frac{\mathrm{A} +\mathrm{T}}{\mathrm{G} +\mathrm{C}} = 1$

(III) Each base pair of DNA is 3.4Å apart from the base pair.

(IV) The nucleosome model DNA packaging was proposed by Kornberg and Thomas.

• I and III

• I, II and III

• II, III and IV

• I, III and IV

Specific radioactive identification of ribosomal RNA can be achieved by using C¹⁴ labelled

• Guanine

• Uracil

• thymine

• Cytocine

Which of the following statements is false regarding SDS-polyacrylamide gel electrophoresis?

• Proteins are separated by molecular weight

• SDS is a detergent which gives charge to protein

• Large protein move more slowly through gel

• SDS is used to maintain the 3-dimensional structure of protein

157.

A bacterium divides after every 35 min, if a culture containing 10⁵ cells per mL is grown, then cell concentration per mL after 175 mins will be

• 175$\times$10⁵

• 125$\times$10⁵

• 48$\times$10⁵

• 32$\times$10⁵

Transformation in bacteria was discovered by

• Lederberg 

• Griffith

• Avery et. al

• Tatum

The arrangement of genes on chromosomes is

• linear 

• ovoid

• diffused 

• spiral

Assertion: Restriction enzymes cut the strand of DNA to produce sticky ends.

Reason: Stickiness of the ends facilitates the action of the enzyme DNA polymerase.

• If both assertion and reason are true and reason is the correct explanation of assertion.

• If both assertion and reason are true but reason is not the correct explanation of assertion.

• If assertion is true but reason is false.

• If both assertion and reason are false.