The cutting of DNA at specific locations became possible with the discovery of?
1. Restriction enzymes
2. Probes
3. Selectable markets
4. ligases
In the following human pedigree, the filled symbols represent the affected individuals. Identify the type of given pedigree:
1. Autosomal dominant
2. X-linked recessive
3. Autosomal recessive
4. X-linked dominant
A colour-blind man marries a woman with normal sight who has no history of colour blindness in her family. What is the probability of their grandson being colour blind? (consider the grandsons only through son)
1. 0.5
2. 1
3. Nil
4. 0.25
Roots play an insignificant role in the absorption of water in:
1. Sunflower
2. Pistia
3. China rose
4. Wheat
Balbiani rings are sites of?
1. Lipid synthesis
2. Nucleotide synthesis
3. Polysaccharide synthesis
4. RNA and protein synthesis
Which of the following pairs is not correctly matched?
| Mode of reproduction | Example | ||
| (a) | Offset | (i) | Water hyacinth |
| (b) | Rhizome | (ii) | Banana |
| (c) | Binary fission | (iii) | Sargassum |
| (d) | Conidia | (iv) | Penicilium |
1. a
2. b
3. c
4. d
Ectopic pregnancies are referred to as?
| 1. | Pregnancies with a genetic abnormality |
| 2. | Implantation of an embryo at a site other than the uterus |
| 3. | Implantation of the defective embryo in the uterus |
| 4. | Pregnancies terminated due to the hormonal imbalance |
Choose the wrong statement:
| 1. | Penicillium is multicellular and produces antibiotics. |
| 2. | Neurospora is used in the study of biochemical genetics. |
| 3. | Morels and truffles are poisonous mushrooms. |
| 4. | Yeast is unicellular and useful in fermentation. |
The function of the gap junction is to?
| 1. | Perform cementing to keep neighbouring cells together |
| 2. | Facilitate communication between adjoining cells by connecting the cytoplasm for rapid transfer of ions, small molecules and some large molecules |
| 3. | Separate two cells from each other |
| 4. | Stop substances from leaking across a tissue |
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