The Leydig cells as found in the human body are the secretory source of:
1. Progesterone
2. Intestinal mucus
3. Glocagon
4. Androgens
Compared to those of humans, the erythrocytes in frogs are:
| 1. | Without nucleus but with haemoglobin |
| 2. | Nucleated and with haemoglobin |
| 3. | Very much smaller and fewer |
| 4. | Nucleated and without haemoglobin |
In which one of the following, the genus name, its two characters and its phylum are not correctly matched, whereas the remaining three are correct?
| Genus Name | Two Characters | Phylum | ||
| 1. | Pila | (i) (ii) |
Body segmented Mouth with Radula |
Mollusca |
| 2. | Asterias | (i) (ii) |
Spiny skinned Water Vascular System |
Echinodermata |
| 3. | Sycon | (i) (ii) |
Pore bearing Canal system |
Porifera |
| 4. | Periplaneta | (i) (ii) |
Jointed appendages Chitinous exoskeleton |
Arthropoda |
What is true about ribosomes?
| 1. | The prokaryotic ribosomes are 80S, where S stands for sedimentation coefficient |
| 2. | These are composed of ribonucleic acid and proteins |
| 3. | These are found only in eukaryotic cells |
| 4. | These are self-splicing introns of some RNAs |
Cirrhosis of the liver is caused by the chronic intake of:
1. Opium
2. Alcohol
3. Tobacco (chewing)
4. Cocaine
Which one is a true statement regarding DNA polymerase used in PCR?
| 1. | It is used to ligate introduces DNA in recipient cells |
| 2. | It serves as a selectable marker |
| 3. | It is isolated from a virus |
| 4. | It remains active at high temperatures |
Which statement is wrong for viruses?
| 1. | All are parasites |
| 2. | All of them have helical symmetry |
| 3. | They have the ability to synthesize nucleic acids and proteins |
| 4. | Antibiotics have no effect on them |
Which one of the following is correctly matched?
1. Onion - Bulb
2. Ginger - Sucker
3. Chlamydomonas - Conidia
4. Yeast - Zoospores
How many plants in the list given below have composite fruits that develop from an inflorescence?
Walnut, poppy, radish, fig, pineapple, apple, tomato, mulberry
| 1. | Four | 2. | Five |
| 3. | Two | 4. | Three |
Given below is the diagrammatic representation of one of the categories of small molecular weight organic compounds in the living tissues. Identify the category shown and the one blank component X in it:
| 1. | Category: Cholesterol; Component: Guanine |
| 2. | Category: Amino acid; Component: NH2 |
| 3. | Category: Nucleotide; Component: Adenine |
| 4. | Category: Nucleoside; Component: Uracil |
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