12-botany- Unit - III & IV Cell Biology And Genetics, Biotechnology
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Prepared by Mr. D. Rajamani, M. Sc. ,M. Ed. , P. G. Asst Botany A. C. S Mat. Hr Sec. School, Arni. Tiruvannamalai Dist ; &nbs p; & www. Padasalai. Net
- 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.
Waldeye
- 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.Hugo de Vries first used the term mutation based on his observation on
- A.
Oenothera lamarckiana
- B.
Sorghum
- C.
Neurospora
- D.
Cicer gigas
- 5.Recombination of chromosome takes place in _____ stage of prophase I of meiosis.
- A.
Pachytene
- B.
Diplotene
- C.
Leptotene
- D.
Zygotene
- 6.Biochemical mutants of _____ failed to synthesize certain amino acids.
- A.
Neurospora
- B.
Sorghum
- C.
Cicer arietinum
- D.
Cicer gigas
- 7.The gametes of Drosophila melanogaster carry
- A.
Four chromosomes
- B.
three chromosomes
- C.
Seven chromosomes
- D.
Eight chromosomes
- 8.Nullisomy is represented by
- A.
2n – 2.
- B.
2n + 2
- C.
2n – 1
- D.
2n + 1
- 9.The width of DNA molecule is
- A.
20 Å
- B.
18 Å
- C.
34 Å
- D.
35 Å
- 10.Double helix DNA model was proposed by _____
- A.
Watson and Crick
- B.
O.T. Avery et al
- C.
Griffith
- D.
Stinberg
- 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.
20 - 30%
- C.
10 - 20%
- D.
5 - 10%
- 13.In bacterial cell, there are more than _____ tRNAs
- A.
70
- B.
200
- C.
300
- D.
400
- 14.Restriction enzymes are synthesized by
- A.
Bacteria only
- B.
yeast and bacteria only
- C.
eukaryotic cells only
- D.
All kinds of cells
- 15.Each restriction enzyme cleaves a molecule only at
- A.
nucleotide sequence
- B.
The time of DNA replication
- C.
Methyl groups
- D.
the ends of genes
- 16.One of the following process is employed to introduce a foreign gene into a cell
- A.
Electroporation
- B.
Electrolysis
- C.
Plasmid
- D.
ligation
- 17.The number of transgenic plants available to-day are approximately
- A.
fifty
- B.
twelve
- C.
six
- D.
Two
- 18.A toxic protein called delta endotoxin is insecticidal and it is produced by
- A.
Bacillus thuringiensis
- B.
Bacillus lactii
- C.
Escherichia coli
- D.
Streptomyces griseus
- 19.Pseudomonas putida is a engineered bacterium that can
- A.
Digest crude oil slick
- B.
Produce a hormone
- C.
Produce a antibiotic
- D.
Pollute the soil
- 20.The inherent potential of any living plant cell to develop into entire organism is called
- A.
totipotency
- B.
Morphogenesis
- C.
Differentiation
- D.
Organogenesis
- 21.The function of cytokinin is to increase
- A.
Cell division
- B.
Cell elongation
- C.
Differentiation
- D.
fruit initiation
- 22.By the application of tissue culture, one important product is formed
- A.
Artificial synthetic seeds
- B.
Many seeded fruit
- C.
triploid endosperm
- D.
Induction of flowers
- 23.The two protoplasts are fused with a fusogen called
- A.
Polyethylene glycol (PEG)
- B.
Polyvinyl chloride (PVC)
- C.
Polyethane glycol (PEG)
- D.
Phosphoric ethane
- 24.Somatic hybrids are produced through
- A.
Protoplasmic fusion
- B.
Asexual fusion
- C.
Vegetative propagation
- D.
Grafting
- 25.One of the following organism is a SCP
- A.
Spirulina
- B.
Nostoc
- C.
Rhizobium
- D.
Mushroom
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