12-botany- Unit - III & IV Cell Biology And Genetics, Biotechnology

26 Questions | By Padasalai12bot | Updated: Mar 20, 2022 | Attempts: 767

Questions

Settings

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

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.
  
  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