Multiple Choice QuestionsWhich one of the following combinations is incorrect?
Rio convention - Air pollution
Kyoto protocol - Climate change
Montreal protocol - Ozone depletion
Ramsar convention - Wetland conservation
Lactose (Lac) operon is regulated by
lac repressor only
lac repressor and CAP-cGMP complex
lac repressor and CAP-cAMP complex
CAP-cAMP and CAP-cGMP complex
Stock and scion are used in
cutting
grafting
layering
micropropagation
B.
grafting
Stock and scion are used in grafting. Grafting is a horticulture technique whereby tissues from one plant are inserted into those of another, so that the two sets of vascular tissues may join together. It is used in asexual propogation of commercially grown plants.
In this technique, one plant is selected for its roots and this is called the stock or root stock. The other plant is selected for its stems, leaves, flowers or fruits and is called the scion or cion. The scion contains the desired genes to be duplicated in future production by the stock/scion plant.
Gene therapy has been successful in curing Codes genetic diseases in laboratory animals through
exposure to X-ray to rectify the defective gene
replacing the defective gene with a functional gene
oral delivery of genes
use of therapeutic medicines to rectify the defective gene
The enzyme peptidyl transferase of prokaryotes resides in
50 S ribosome
30 S ribosome
40 S ribosome
60 S ribosome
The tRNA anticodon 3'-UAC-5' will pair with the mRNA codon
5'-AUU-3'
5'-UAC-3'
5'-AUG-3'
3'-GUA-5'
Match the items in column I with those in column II and choose the correct answer.
| Column I | Column II |
| A. Thiobacillus | 1. Nitrogen- fixation |
| B. Nitrosomonas | 2. Ammonification |
| C. Azotobacter | 3. Nitrification |
| D. Pseudomonas | 4. Denitrification |
A- 4; B- 3; C- 1; D- 2
A- 3; B- 4; C- 1; D- 2
A- 4; B- 2; C- 1; D- 3
A- 2; B- 1; C- 3; D- 4
A male rabbit of genotype 'AABBDDEE' is crossed with a female rabbit of genotype 'aabbddee' to produce F1 hybrid offspring. How many genetically different gametes can be produced by this F1 hybrid?
4
8
16
32
Match the following column I with column II.
| Column I | Column II |
| A. Pollen grains | 1. Photochemical smog |
| B. PAN | 2. Particulate pollution |
| C. CO2 | 3. Global warming |
| D. Cadmium | 4. Itai- itai disease |
A- 2; B- 1; C- 3; D- 4
A- 4; B- 2; C- 1; D- 3
A- 1; B- 2; C- 3; D- 4
A- 3; B- 1; C- 2; D- 4
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