12-bio-botany-unit-III Cell Biology And Genetics
13 Questions
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Questions and Answers
- 1.The term chromosome was introduced by
- A.
Waldeyer
- B.
Bridges
- C.
Balbiani
- D.
Flemming
- 2.Who had first proved that the genes are carried by the chromosome?
- A.
Bridges
- B.
Waldeyer
- C.
Balbiani
- D.
Flemming
- 3.The coupling test cross ratio is
- A.
7:1:1:7
- B.
1:7:7:1
- C.
1:1:1:1
- D.
9:3:3:1
- 4.Recombination of chromosome takes place in _____ stage of prophase I of meiosis.
- A.
Pachytene
- B.
Leptotene
- C.
Zygotene
- D.
Diplotene
- 5.Hugo de Vries first used the term mutation based on his observation on
- A.
Oenothera lamarckiana
- B.
Sorghum
- C.
Neurospora
- D.
Cicer gigas
- 6.Biochemical mutants of _____ failed to synthesize certain amino acids.
- A.
Neurospora
- B.
Sorghum
- C.
Cicer arietinum
- D.
Cicer gigas
- 7.Nullisomy is represented by
- A.
2n – 2
- B.
2n – 1
- C.
2n + 1
- D.
2n + 2
- 8.The gametes of Drosophila melanogaster carry
- A.
Four chromosomes
- B.
Three chromosomes
- C.
Seven chromosomes
- D.
Eight chromosomes
- 9.Double helix DNA model was proposed by _____
- A.
Watson and Crick
- B.
O.T. Avery et al
- C.
Griffith
- D.
Stinberg
- 10.The width of DNA molecule is
- A.
20 Å
- B.
18 Å
- C.
34 Å
- D.
35 Å
- 11.RNA is universally present in all organisms except in _____
- A.
DNA viruses
- B.
TMV
- C.
Bacteria
- D.
Algae
- 12.MRNA is about _____ of the RNA content of the cell
- A.
3 - 5%
- B.
10 - 20%
- C.
5 - 10%
- D.
20 - 30%
- 13.In bacterial cell, there are more than _____ tRNAs
- A.
70
- B.
200
- C.
300
- D.
400
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