Today Quiz

Biology

1. Which one of the following theories does not explain crossing over?

A. Torsion Theory
B. Chiasma type theory
C. Breaking first theory
D. Coupling and repulsion theory

2. Chromosomal theory of heredity is

A. Genes composed of chromosomes
B. A chromosome is made up of DNA and histone protein
C. Genes are found on chromosomes
D. Each and every living organism must have a set of chromosomes

3. Artificial mutation is

A. Induced mutation
B. Chemical mutation
C. Desired mutation
D. All of the above

4. Starting codon

A. AUG
B. AGA
C. AGU
D. GUG

5. Non-sense codon

A. UAA
B. UGA
C. UAG
D. All of the above

6. Not a pyridine base

A. Thymine
B. Guanine
C. Uracil
D. Cytosine

7. Operon concept was given by

A. Jacob and Monod
B. Watson and Crick
C. Schleiden and Schwann
D. Morgan and Beadle

8. Who first established the fact that DNA is the GENETIC MATERIAL by his experiments with Streptococcus pneumoniae?

A. Fred Griffith
B. O.T. Avery
C. Marshall Nirenberg
D. Robert W. Holley

9. Nucleoside?

A. Base + Sugar
B. Base + Phosphate
C. Sugar + Phosphate
D. Base + Sugar + Phosphate

10. Chargaff's Rule?

A. A + G = T + C
B. A + T = G + C
C. A/T = G/C
D. A = T = C = G

11. The cell DNA mainly exists in the form of

A. Left handed alpha - helix
B .Left handed beta - helix
C. Right handed alpha helix
D. Right handed beta helix

12. Z-DNA is

A. Double stranded DNA
B. Left handed helix
C. 12 residues per turn
D. All of the above