Oxygenic photosynthesis occurs in:
1. Chromatium
2. Oscillatoria
3. Rhodospirillum
4. Chlorobium
The genetic defect-Adenosine Deaminase (ADA) deficiency may be cured permanently by:
1. | periodic infusion of genetically engineered lymphocytes having functional ADA cDNA |
2. | administering adenosine deaminase activators |
3. | introducing bone marrow cells producing ADA into cells at early embryonic stages |
4. | invitro cell culture therapy |
The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is:
1. maturing
2. elongating
3. widening
4. differentiating
In barley stem, vascular bundles are:
1. open and scattered
2. closed and scattered
3. open and in a ring
4. closed and radial
Sickle cell anaemia is:
1. | an autosomal linked dominant trait |
2. | caused by substitution of valine by glutamic acid in the globin chain of haemoglobin |
3. | caused by a change in base pair of DNA |
4. | characterized by elongated sickle like RBCs with a nucleus |
If a live earthworm is pricked with a needle on its outer surface without damaging its gut, the fluid that comes out is:
1. excretory fluid
2. coelomic fluid
3. haemolymph
4. slimy mucus
There is no DNA in:
1. | an enucleated ovum | 2. | mature RBCs |
3. | a mature spermatozoan | 4. | hair root |
Point mutation involves:
1. insertion
2. change in single base pair
3. duplication
4. deletion
Which one of the following has maximum genetic diversity in India?
1. Teak
2. Mango
3. Wheat
4. Tea
In a standard ECG, which one of the following alphabets is the correct representation of the respective activity of the human heart?
1. R-repolarisation of ventricles
2. S-start of systole
3. T-end of diastole
4. P-depolarisation of the atria