What triggers activation of protoxin to active Bt toxin of Bacillus thuringiensis in boll worm?
Moist surface of midgut
Alkaline pH of gut
Acidic pH of stomach
Body temperature
B.
Alkaline pH of gut
Bacillus thuringiensis forms protein crystals during a particular phase of their growth. These crystals contain a toxic insecticidal protein. These protein exist as inactive protoxins but once an insect ingest the inactive toxin, it is converted into an active form of toxin due to alkaline pH of the gut which solubilize the crystals. The activated toxin binds to the surface of midgut epithelial cells and create pores that cause cell swelling and lysis and eventually cause death of insect.
Match Column I with Column II and choose the correct option.
| Column I | Column II |
| 1. Totipotency | A. breeding crops with higher levels of nutrients |
| 2. Micropropagation | B. plant grown from hybrid protoplast |
| 3. Somaclone | C. producing a large number of plants through tissue culture |
| 4. Somatic hybrid | D. capacity to generate a whole plant from an explan |
| 5. Biofortification | E. Plants genetically identical to the original plant |
1 - D; 2 - C; 3 - E; 4 - B; 5 - A
1 - A; 2 - E; 3 - B; 4 - D; 5 - C
1 - C; 2 - B; 3 - E; 4 - D; 5 - A
1 - D; 2 - E; 3 - A; 4 - D; 5 - C
1 - D; 2 - E; 3 - A; 4 - D; 5 - C
Which one of the following is used extensively in biochemical and genetic work?
Saccharomyces
Aspergillus
Claviceps
Penicillium
Penicillium
A person affected with phenylketonuria, lacks an enzyme that converts the amino acid phenylalanine into
Valine
Proline
Histidine
Tyrosine
Tyrosine
Assertion : "Rosie", the first transgenic cow, produced human protein-enriched milk.
Reason : The milk contained the human alpha for human babies than natural cow milk.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both the assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both the assertion and reason are false.
Which of the following statements about transgenic animals is/are false?
(i) Transgenic animals are designed to study how genes are regulated.
(ii) They are specially made to serve as models for human diseases.
(iii) Transgenic Cow, Rosie was created to produce the human protein a-1-antitrypsin.
(iv) Transgenic mice are used to test the safety of vaccines.
(iii) only
(i) and (iii) only
(ii) only
(ii) and (iii) only
(ii) and (iii) only
Select the wrong statement
Human insulin is being commercially produced from a transgenic species of Escherichia coli.
The genetically modified bacillus thuringiensis is used as biopesticide on the commercial scale
Human protein, alpha-1 -antitrypsin is used to treat emphysema
The first transgenic cow, Rosie, produced alpha lactalbumin, enriched milk
The first transgenic cow, Rosie, produced alpha lactalbumin, enriched milk
