Q. No.The force that holds DNA together in a double helix is:
(1) The force of the twist
(2) Covalent bonds
(3) Ionic bonds or ionic interactions
(4) Hydrogen bonds
Experiments by Avery, Macleod, and McCarty supported DNA as the genetic material by showing that:
(1) Both protein and DNA samples provided the transforming factor
(2) DNA was not complex enough to be the genetic material
(3) Only samples with DNA provided transforming activity
(4) Even though DNA was molecularly simple, it provided adequate variation to act as the genetic material
SNP which is pronounced as "snips” stands for:
(1) Small nuclear protein
(2) Single nucleotide particle
(3) Single nucleotide polymorphism
(4) Small nicking points
The length of E. coli DNA and length of DNA in a human 2N cell is:
(1) 1.36 mm and 2.2 m respectively
(2) 1.36 mm and 2.2 mm respectively
(3) 1.3 ìm and 2.2 ìm respectively
(4) 1.36 cm and 2.2 cm respectively
Identify the incorrectly matched pair:
| Organism | Length of DNA |
| 1. Bacteriophage ϕ 174 | 5386 base pairs |
| 2. Bacteriophage Lambda | 48502 base pairs |
| 3. Escherichia coli | 4.6 X 10^6 base pairs |
| 4. Human beings | 3.3 X 10^9 base pairs |
Which of the following would be nucleoside found only in RNA?
(1) Thymidine
(2) Cytidine
(3) Uridine
(4) Adenosine
In a strand of a nucleic acid. Two nucleotides are linked together by:
(1) 3’ – 5’ phosphodiester bond
(2) 5’ – 3’ phosphodiester bond
(3) 2’ – 5’ phosphodiester bond
(4) 3’ – 1’ phosphodiester bond
What is another name for thymine?
1. 5 – bromouracil
2. 3 – bromouracil
3. 3 – methyl uracil
4. 5 – methyl uracil
Watson and Crick based their model of DNA on X-ray diffraction data produced by:
1. Hershey and Chase
2. Marie Curie and Pierre Curie
3. Franklin and Wilkins
4. Meselson and Stahl
In prokaryotes:
(1) A typical nucleus is not seen and DNA is scattered throughout the cell
(2) A typical nucleus may sometimes be present and DNA is scattered throughout a cell
(3) A typical nucleus is not seen but DNA is not scattered throughout the cell
(4) A typical nucleus may sometimes be present but DNA is not scattered throughout the cell
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