The rate of a first-order reaction is 0.04 mol L–1 s–1 at 10 seconds and 0.03 mol L–1 s–1 at 20 seconds after initiation of the reaction. The half-life period of the reaction is:
1. 44.1 s
2. 54.1 s
3. 24.1 s
4. 34.1 s
1. 44.1 s
2. 54.1 s
3. 24.1 s
4. 34.1 s
Subtopic: First Order Reaction Kinetics |
62%
Level 2: 60%+
NEET - 2016
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Which of the following characteristic features always hold true for the corresponding group of animals?
| (a) | Viviparous | (1) | Mammalia |
| (b) | Possess a mouth with an upper and a lower jaw | (2) | Chordata |
| (c) | 3- chambered heart with one incompletely divided ventricle | (3) | Reptilia |
| (d) | Cartilaginous - Endoskeleton | (4) | Chondrichthyes |
1. a
2. b
3. c
4. d
Subtopic: Comparative study of Cartilagenous & Bony Fishes |
77%
Level 2: 60%+
NEET - 2016
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Changes in GnRH pulse frequency in females is controlled by circulating levels of:
| 1. | estrogen and inhibin | 2. | progesterone only |
| 3. | progesterone and inhibin | 4. | estrogen and progesterone |
Subtopic: Menstrual Cycle |
74%
Level 2: 60%+
NEET - 2016
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Microtubules are the constituents of?
| 1. | spindle fibres, centrioles and cilia |
| 2. | centrioles, spindle fibres and chromatin |
| 3. | centrosome, nucleosome and centrioles |
| 4. | cilia, flagella and peroxisomes |
Subtopic: Cytoskeleton |
74%
Level 2: 60%+
NEET - 2016
Hints
Mitochondria and chloroplast are:
Which one of the following options is correct?
| I: | semi-autonomous organelles. |
| II: | formed by the division of pre-existing organelles and they contain DNA but lack protein-synthesizing machinery. |
Which one of the following options is correct?
1. II is true but I is false
2. I is true but II is false
3. Both I and II are false
4. Both I and II are correct
2. I is true but II is false
3. Both I and II are false
4. Both I and II are correct
Subtopic: Plastids | Mitochondria |
63%
Level 2: 60%+
NEET - 2016
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Photosensitive compound in the human eye is made up of:
| 1. Opsin and Retinal | 2. Opsin and Retinol |
| 3. Transducin and Retinene | 4. Guanosine and Retinol |
85%
Level 1: 80%+
NEET - 2016
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Chrysophytes, euglenoids, dinoflagellates and slime moulds are included in the kingdom:
| 1. | Protista | 2. | Fungi |
| 3. | Animalia | 4. | Monera |
Subtopic: Kingdom Protista: Introduction |
92%
Level 1: 80%+
NEET - 2016
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The primitive prokaryotes responsible for the production of biogas from the dung of ruminant animals, including the:
1. thermoacidophiles
2. methanogens
3. eubacteria
4. halophiles
1. thermoacidophiles
2. methanogens
3. eubacteria
4. halophiles
Subtopic: Kingdom Monera: Bacterial Classification |
97%
Level 1: 80%+
NEET - 2016
Hints
Identify the correct statement on 'inhibin':
| 1. | Is produced by granulosa cells in the ovary and inhibits the secretion of FSH |
| 2. | Is produced by granulosa cells in the ovary and inhibits the secretion of LH |
| 3. | Is produced by nurse cells in the testes and inhibits the secretion of LH |
| 4. | Inhibits the secretion of LH, FSH and prolactin. |
Subtopic: Seminiferous Tubules & Spermatogenesis | Spermiogenesis/Sperm Structure/Hormonal Regulation |
Level 3: 35%-60%
NEET - 2016
Hints
It is much easier for a small animal to run Uphill than for a large animal, because?
| 1. | Smaller animals have a higher metabolic rate |
| 2. | Small animals have a lower O2 requirement |
| 3. | The efficiency of muscles in large animals is less than, in the small animals |
| 4. | It is easier to carry a small body weight |
51%
Level 3: 35%-60%
NEET - 2016
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