Middle lamella is mainly composed of

(a) hemicellulose

(b) muramic acid

(c) calcium pectate

(d) phosphoglycerides

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Plasmodesmata are

(a) lignified cemented layers between cells

(b) locomotory structures

(c) membranes connecting the nucleus with plasmalemma

(d) connections between adjacent cells

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Cytoskeleton is made up of

(a) calcium carbonate granules

(b) callose deposits

(c) cellulosic microfibrils

(d) proteinaceous filaments

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Keeping in view the 'fluid mosaic model for the structure of cell membrane, which one of the following statements is correct with respect to the movement of lipids and proteins from one lipid monolayer to the other (described as flip-flop movement)?

(a) Both lipids and proteins can flip-flop

(b) While lipids can rarely flip-flop, proteins cannot

(c) While proteins can flip-flop, lipids cannot

(d) Neither lipids, nor proteins can flip-flop

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Polysome is formed by

(a) several ribosomes attached to a single mRNA

(b) many ribosomes attached to a strand of endoplasmic reticulum

(c) a ribosome with several subunits 

(d) ribosomes attached to each other in a linear arrangement

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The two subunits of ribosome remain united at a critical ion level of

(a) copper

(b) manganese

(c) magnesium

(d) calcium

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Vacuole in a plant cell

(a) is membrane-bound and contains storage proteins and lipids

(b) is membrane-bound and contains water and excretory substances

(c) lacks membrane and contains air

(d) lacks membrane and contains water and excretory substances

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In germinating seeds fatty acids are degraded exclusively in the

(a) proplastids

(b) glyoxysomes

(c) peroxisomes

(d) mitochondria

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Which one of the following is not a constituent of cell membrane ?

(a) Cholesterol

(b) Glycolipids

(c) Proline

(d) Phospholipids

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Lysozyme that is present in perspiration, saliva and tears, destroys:

(a) certain fungi

(b) certain types of bacteria

(c) all viruses

(d) most virus-infected cells

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