1. Live cells can be imaged by (a) Light microscopy (b) Electron microscopy (c)
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Question
1. Live cells can be imaged by (a) Light microscopy (b) Electron microscopy (c) Both kinds of microscopy (d) With the naked eye. 2. A carbon atom has a valency of (c) 4 or 3. A covalent bond between C, H and O atoms can be broken by (a) Visible light (b) Ultra-violet light (c) Infra red light (d) All of the above. 4. Water is a very good solvent for (a) Salts (b) Fats (c) Carbohydrates (d) Salts and some carbohydrates. 5. Denaturation of nucleic acids refers to (a) Separation of complementary strands (b) Dissociation of complementary regions of the same strand (c) Either of the above (d) Degradation of the molecule.Explanation / Answer
1. Light microscopy,
In electron microscopy the radiation source is beams of electrons. Cell cannot be live.
2. Carbon has valency 4. Because valency is a tendency of an atom to donate or accept electrons. And valence shell of carbon has 4 electrons and needs 4 more electrons to complete ocatate configuration.
3. Ultra violet light.
Covalent bonds are considered as strong bonds in biological system.
4.salts and some carbohydrates
Because water is capable for dissolving variety of different types of substances.it is also called as universal solvent.
5. Separation of complementary strands.
Denaturation is the alterations in native structure that is secondary or tertiary structure.
6. It is incomplete question.
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