MCQ
Expressed Sequence Tags (ESTs) refers to
- ACertain important expressed genes.
- ✓All genes that are expressed as $RNA$.
- CAll genes that are expressed as proteins.
- DAll genes whether expressed or unexpressed.
✓
Answer
Correct option: B.
All genes that are expressed as $RNA$.
b
All the genes that are expressed as RNA are referred to as Expressed Sequence Tags $(ESTs)$.
All the genes that are expressed as RNA are referred to as Expressed Sequence Tags $(ESTs)$.
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→(i) The vegetative cell is bigger, has abundant food reserve and a large irregularly shaped nucleus.
(ii) The generative cell is small and floats in the cytoplasm of the vegetative cell.
(iii) In over 60 per cent of angiosperms, pollen grains are shed at 3-celled stage.
(iv) The period for which pollen grains remain viable is highly variable and to some extent depends on the prevailing temperature and humidity.
(v) In some cereals such as rice and wheat, pollen grains maintain viability for months.
(vi) In some members of Rosasceae, Leguminosae and Solanaceae, Pollen grains lose viability within 30 miftutes of their release.
(vii) It is not possible to store pollen grains of a large number of species for years in liquid nitrogen ($-196^{\circ}C$).
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