With regard to insulin, choose the correct options:
(a) | C-peptide is not present in mature insulin. |
(b) | The insulin produced by rDNA technology has C-peptide. |
(c) | The pro-insulin has C-peptide. |
(d) | A-peptide and B-peptide of insulin are interconnected by disulphide bridges. |
1. | (a), (c) and (d) only | 2. | (a) and (d) Only |
3. | (b) and (d) only | 4. | (b) and (c) only |
Assertion (A): | Somatic embryo is also called non-zygotic embryo. |
Reason (R): | Zygote is not involved in somatic embryo formation. |
1. | Both (A) and (R) are true and (R) is the correct explanation of (A) |
2. | Both (A) and (R) are true and (R) is not the correct explanation of (A) |
3. | (A) is true, (R) is false |
4. | (A) is false, (R) is true |
Given below are a few statements regarding somatic hybridization. Choose the correct statements.
I. | Protoplasts of different cells of the same plant are fused. |
II. | Protoplasts from cells of different species can be fused. |
III. | Treatment of cells with cellulase and pectinase is mandatory. |
IV. | The hybrid protoplast contains characters of only one parental protoplast. |
1. I and III
2. I and II
3. I and IV
4. II and III
Give below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): | In human beings, insulin is synthesized as a pro-hormone which needs to be processed before it becomes fully mature and functional. |
Reason (R): | The extra stretch of C-peptide is to be removed from A and B peptide chain of insulin. |
In the light of the above statements, Choose the most appropriate answer from the option given below :
1. | (A) is True but (R) is False. |
2. | (A) is False but (R) is True. |
3. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
4. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
Statement I: | Bacillus thuringiensis forms protein crystals which contain a toxin that kills certain insects but not Bacillus because Bt toxin protein exists as inactive protoxins in Bacillus. |
Statement II: | Bacillus thuringiensis forms protein crystals which contain a toxin that kills certain insects but not Bacillus because toxin requires alkaline pH available in the gut of insects and which solubilises the crystals in order to convert into an active form. |
Statement I: | The genetic constitution of a plant is unaffected in vegetative propagation |
Statement II: | Totipotency of cells enables us to micropropagate plants |
1. | Both statement I and statement II are true |
2. | Both statement I and statement II are false |
3. | Statement I is correct but statement II is false |
4. | Statement I is incorrect but statement II is true |
Statement I: | Proteins encoded by genes cryIAc and cryllAb control corn borer, that of crylAb control the cotton bollworms |
Statement II: | Bt toxin protein exist as inactive protoxins but once an insect ingests the inactive toxin, it is converted into an active form of toxin due to the alkaline pH of the gut |
(i) | Genes are unstable and break down over time in the cell. |
(ii) | Lung cells are constantly being replaced and new cells will have the faulty allele. |
(iii) | The non-mutated allele is recessive. |
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(i) | invertebrate animal DNA in mammal DNA |
(ii) | prokaryotic DNA in plant DNA |
(iii) | plant DNA in animal DNA |
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(i) | PCR is used to detect mutations in genes in suspected cancer patients. |
(ii) | A direct method to insert a foreign gene into plant cells is micro-injection. |
(iii) | The first transgenic cow, Rosie, produced human protein-enriched milk, i.e., 5.4 grams per litre. |
(iv) | RNAi takes place in all eukaryotic organisms as a method of cellular defense. |