(1). A major breakthrough in the studies of cells came with the development of electron microscope. This is because

• (a). the electron microscope is more powerful than the light microscope as it uses a beam of electrons which has wavelength much longer than that of photons
• (b). the resolving power of the electron microscope is much higher than that of the light microscope
• (c). the resolving power of the electron microscope is 200 - 350 nm as compared to 0.1 - 0.2 nm for the light microscope
• (d). electron beam can pass through thick materials, whereas light microscopy requires thin sections.
• (e). None of these

(2). Which of the following statements regarding cilia is not correct ?

• (a). Cilia contain an outer ring of nine doublet microtubules surrounding two singlet microtubules.
• (b). The organized beating of cilia is controlled by fluxes of Ca2+ across the membrane.
• (c). Cilia are hair-like cellular appendages
• (d). Microtubules of cilia are composed of tubulin
• (e). None of these

(3). Which of the following statements regarding mitochondrial membrane is not correct ?

• (a). The outer membrane resembles a sieve.
• (b). The outer membrane is permeable to all kinds, of molecules.
• (c). The enzymes of the electron transfer chain are embedded in the outer membrane.
• (d). The inner membrane is 0 highly convoluted forming a series of infoldings.
• (e). None of these

(4). Biological organisation starts with

• (a). cellular level
• (b). organismic level
• (c). atomic level
• (d). submicroscopic molecular level
• (e). None of these

(5). Select the wrong statement from the following.

• (a). Both chloroplasts and mitochondria have an internal compartment, the thylakoid space bounded by the thylakoid membrane
• (b). Both chloroplasts and mitochondria contain DNA.
• (c). The chloroplasts are generally much larger than mitochondria.
• (d). Both chloroplasts and mitochondria contain an inner and an outer membrane.
• (e). None of these

(6). Which one of the following is not a constituent of cell membrane ?

• (a). Glycolipids
• (b). Proline
• (c). Phospholipids
• (d). Cholesterol
• (e). None of these

(7). Keeping in View the 'fluid mosaic`model' for the structure of cell membrane, which one of the following statement is correct with respect to the movements of lipids and proteins from one lipid monolayer to the other (described as flipflop movement) ?

• (a). While proteins can flip-flop, lipids can not
• (b). Neither lipids, nor proteins can flip-flop
• (c). Both lipids and proteins can flip-flop
• (d). While lipids can rarely flip-flop, proteins can not
• (e). None of these

(8). The two sub-units of ribosome remain united at a criticalion level of

• (a). magnesium
• (b). calcium
• (c). copper
• (d). manganese
• (e). None of these

(9). Vacuole in a plant cell

• (a). lacks membrane and contains air
• (b). lacks membrane and contains water and excretory substances
• (c). is membrane-bound and contains storage proteins and lipids
• (d). is membrane-bound and contains water and excretory substances
• (e). None of these

(10). In germinating seeds fatty acids are degraded exclusively in the

• (a). peroxisomes
• (b). mitochondria
• (c). proplastids
• (d). glyoxysomes.
• (e). None of these

(11). Plasmodesmata are

• (a). Iocomotary structures
• (b). membranes connecting the nucleus with plasmalemma
• (c). connections between adjacent Cells
• (d). lignified cemented layers between cells.
• (e). None of these

(12). Cytoskeleton is made up of

• (a). callose deposits
• (b). cellulosic microfibrils
• (c). proteinaceous filaments
• (d). calcium carbonate granules
• (e). None of these

(13). Middle lamella is composed mainly of

• (a). muramic acid
• (b). calcium pectate
• (c). phosphoglycerides
• (d). hemicellulose
• (e). None of these

(14). Which one of the following structures between two adjacent cells is an effective transport pathway?

• (a). Plasmodesmata
• (b). Plastoquinones
• (c). Endoplasmic reticulum
• (d). Plasmalernma
• (e). None of these

(15). Which one of the following has its own DNA ?

• (a). Mitochondria
• (b). Dictyosome
• (c). Lysosome
• (d). Peroxisome
• (e). None of these

(16). The main area of various types of activities of a cell is

• (a). plasma membrane
• (b). mitochondrion
• (c). cytoplasm
• (d). nucleus
• (e). None of these

(17). The plasma membrane consists of mainly

• (a). phospholipids embedded in a protein bilayer
• (b). proteins embedded in a phospholipid bilayer
• (c). proteins embedded in a polymer of glucose molecules
• (d). proteins embedded in a carbohydrate bilayer.
• (e). None of these

(18). An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called

• (a). thylakoid
• (b). endoplasmic reticulum
• (c). plasmalemma
• (d). cytoskeleton
• (e). None of these

(19). Import site for formation of glycoproteins and glycolipids is

• (a). vacuole
• (b). Golgi apparatus
• (c). plastid
• (d). lysosome
• (e). None of these

(20). An organic substance bound to an enzyme and essential for its activity is called

• (a). isoenzyme
• (b). coenzyme
• (c). holoenzyme
• (d). apoenzyme
• (e). None of these