Membrane-bound organelles are absent in:
1. Saccharomyces
2. Streptococcus
3. Chlamydomonas
4. Plasmodium
Vasa efferentia are the ductules leading from:
1. Testicular lobules to rete testis
2. Rete testis to vas deferens
3. Vas deferens to epididymis
4. Epididymis to urethra
Select the correct statement from the following:
| 1. | Biogas is produced by the activity of aerobic bacteria on animal waste |
| 2. | Methanobacterium is an aerobic bacterium found in the rumen of cattle |
| 3. | Biogas, commonly called gobar gas, is pure methane |
| 4. | Activated sludge-sediment in settlement tanks of sewage treatment plant is a rich source of aerobic bacteria |
Select the two correct statements out of the four (a-d) given below about lac operon:
| (a) | Glucose or galactose may bind with the repressor and inactivate it. |
| (b) | In the absence of lactose, the repressor binds with the operator region. |
| (c) | The z-gene codes for permease. |
| (d) | It was explained by Francois Jacob and Jacque Monod. |
1. (b) and (c)
2. (a) and (c)
3. (b) and (d)
4. (a) and (b)
The kind of epithelium which forms the inner walls of blood vessels is:
1. cuboidal epithelium
2. columnar epithelium
3. ciliated columnar epithelium
4. squamous epithelium
Which one of the following has its own DNA?
1. Mitochondria
2. Dictyosome
3. Lysosome
4. Peroxisome
Transfer of pollen grains from the anther to the stigma of another flower of the same plant is called:
1. xenogamy
2. geitonogamy
3. karyogamy
4. autogamy
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