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

The term ‘prebiotic’ soup’ for organic water containing mixture of simple organic compounds was given by

• Richter

• Haldane

• Arrhenius

• Miller

Number of Barr body which will found in case of Turner’s syndrome will be

• 1

• 2

• 0

• Can't be determined by given data

Which one of the following options is not a sexually transmitted disease?

• AIDS

• Hepatitis-B

• Pertussis

• Syphilis

55.

Pappus helps in the dispersal of pollen in

• Asteraceae

• Brassicaceae

• Malvaceae

• Solanaceae

Diphtheria is caused by

• Poison released by living bacterial cell into the host

• Poison released from the dead bacterial cell into the host

• Poison released by the virus into the host

• Excessive immune response by the body of the host

Which one of the following microbes is the source for vitamin-C?

• Pseudomonas sp.

• Acetobacter sp.

• Aspergillus sp.

• Chlorella

The fact that DNA is a genetic material was established by the experiment of

• Meselson and Stahl

• Hershey and Chase

• Avery, Macleod and McCarty

• Rosalind Franklin and Kornberg

Match the following Columns

Column I (Pollination Technique)	Column II (Pollinator)
A. Cheiropterophily	1. Ant
B. Anemophily	2. Bat
C. Myrmecophily	3. Snail
D. Malaciphily	4. Wind

• A – 3; B – 2; C – 1; D – 4

• A – 2; B – 4; C – 1; D – 3

•  A – 4; B – 3; C – 2; D – 1

• A – 1; B – 3; C – 2; D – 4

In case of pregnancy, the heartbeat of embryo starts at

• 4th week

• 7th week

•  6th week

•  5th week