6. Glycerol, 2 fatty acids, phosphate and an amine form A) steroid B) chitin C)

Question

6. Glycerol, 2 fatty acids, phosphate and an amine form A) steroid B) chitin C) triglyceride D) phospholipid Resolution power of electron microscope is A) 0.2m B) .2nm C) 0.2mm D) 2.0cm 8. Deoxyribose lose O at A)CI B)C2 C)C D) C 9. Cell membrane is fluid due to movement of A) cholesterol B) protein C) phospholipid D) glycolipid 10. Plant cells placed in 1.2% NaCl solution A) flaccid B) turgid C) plasmolyzed D) none of these 11. Number of covalent bonds formed by nitrogen is A) 1 B)2 C)3 D)4 E)5

Explanation / Answer

Ans . 6 . D) Phospholipid

explaination :- 2 molecules of fatty acid + glycerol + phosphoric acid + nitrogenous compound togetherly form phospholipid

Phosopholipid are most abundant type of lipids in protoplasm

Ans7. B) 0.2nm

explaination :- Electron microscope has higher resolving power than light microscope . It has magnification power upto 10,000,000x . Electron microscope has optical lens systems and have 0.2 nm resolving power

Ans 8. B) 2nd carbon

explaination :- ribose sugar form deoxyribose sugar with help of enzyme ribonucleotide reductase and lose 1 oxygen atom from 2nd carbon of deoxyribose sugar

Ans 9. A) cholesterol

explaination - It is present in animal cell membrane and absent in plant cell membrane . It is present between phospholipids molecules and it helps in maintaining fluidity

Ans 10. C) plasmolyzed

explaination :- when cell is placed in hypertonic solution then plasmolysis occur and when placed in hypotonic solution deplasmolysis occur

(** exact concentration of plant cell is not given which is important to know the behaviour of plant cell in given solution)

Ans 11. D) 4

explaination: - Nitrogen has 3 elections in 2p orbital and 1lone pair. Nitrogen share 3electrons and donate 1 lone pair ( coordinate bond) to form 4 covalents bond.

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