Test cross involves:
| 1. | crossing between two genotypes with recessive trait |
| 2. | crossing between two F1 hybrids |
| 3. | crossing the F1 hybrid with a double recessive genotype |
| 4. | crossing between two genotypes with the trait |
Antiparallel strands of a DNA molecule mean that:
| 1. | one strand turns anti-clockwise |
| 2. | the phosphate groups of two DNA strands, at their ends, share the same position |
| 3. | the phosphate groups at the start of two DNA strands are in opposite positions (pole) |
| 4. | one strand turns clockwise |
Areolar connective tissue joins the:
1. fat body with muscles
2. integument with muscles
3. bones with muscles
4. bones with bones
If a colourblind woman marries a normal-visioned man, their sons will be:
1. all normal visioned
2. one-half colourblind and one-half normal
3. three-fourths colourblind and one-fourth normal
4. all colourblind
Cri-du-chat syndrome in humans is caused by the:
| 1. | fertilization of an XX egg by a normal y-bearing sperm |
| 2. | loss of half of the short arm of chromosome 5 |
| 3. | loss of half of the long arm of chromosome 5 |
| 4. | trisomy of 21st chromosome |
Restriction endonuclease:
1. cuts the DNA molecule randomly
2. cuts the DNA molecule at specific sites
3. restricts the synthesis of DNA inside the nucleus
4. synthesis DNA
Antibodies in our body are complex:
1. lipoproteins
2. steroids
3. prostaglandins
4. glycoproteins
The limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal wastewater into natural surface water is:
1. < 3.0 ppm
2. < 10 ppm
3. < 100 ppm
4. < 30 ppm
Earthworms are:
1. ureotelic when plenty of water is available
2. uricotelic when plenty of water is available
3. uricotelic under conditions of water scarcity
4. ammonotelic when plenty of water is available
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