Some hyperthermophilic organisms that grow in highly acidic (pH 2) habitats belong to the two groups called:
1. eubacteria and archaea
2. cyanobateria and diatoms
3. protists and mosses
4. liverworts and yeasts
Genetic engineering has been successfully used for producing:
| 1. | transgenic mice for testing the safety of polio vaccine before use in humans |
| 2. | transgenic models for studying new treatments for certain cardiac disease |
| 3. | transgenic Cow-Rosie which produces high-fat milk for making ghee |
| 4. | Animals like bulls for farm work as they have super power |
Some of the characteristics of Bt cotton are:
| 1. | long fibre and resistance to aphids |
| 2. | medium yield, long fibre, and resistance to beetle pests |
| 3. | high yield and production of toxic protein crystals, which kill dipteran pests |
| 4. | high yield and resistance to bollworms |
Heartwood differs from sapwood in:
1. presence of rays and fibres
2. absence of vessels and parenchyma
3. having dead and non-conducting elements
4. being susceptible to pests and pathogens
Satellite DNA is a useful tool in:
1. Organ transplantation
2. Sex determination
3. Forensic science
4. Genetic engineering
The second maturation division of the mammalian ovum occurs:
| 1. | Shortly after ovulation before the ovum makes entry into the Fallopian tube |
| 2. | until after the ovum has been penetrated by a sperm |
| 3. | until the nucleus of the sperm has fused with that of the ovum |
| 4. | in the Graafian follicle following the first maturation division |
Which one of the following does not follow the central dogma of molecular biology?
1. Pea
2. Mucor
3. Chlamydomonas
4. HIV
Which one of the following statements about human sperm is correct?
| 1. | The acrosome has a conical, pointed structure used for piercing and penetrating the egg, resulting in fertilization. |
| 2. | The sperm lysins in the acrosome dissolve the egg envelope, facilitating fertilization. |
| 3. | The acrosome serves as a sensory structure, leading the sperm towards the ovum. |
| 4. | The acrosome serves no particular function. |
Consider the following four statements (a–d) regarding kidney transplant and select the two correct ones out of these:
| (a) | Even if a kidney transplant is proper the recipient may need to take immunosuppressants for a long time |
| (b) | The cell-mediated immune response is responsible for the graft rejection |
| (c) | The B-lymphocytes are responsible for rejection of the graft |
| (d) | The acceptance or rejection of a kidney transplant depends on specific interferons |
The two correct statements are:
1. (b) and (c)
2. (c) and (d)
3. (a) and (c)
4. (a) and (b)
Wind pollinated flowers are:
| 1. | small, brightly coloured, producing large number of pollen grains |
| 2. | small, producing large number of dry pollen grains |
| 3. | large, producing abundant nectar and pollen |
| 4. | small, producing nectar and dry pollen |
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