Cell & Cell Division Part IX

1) The enzyme which combines with a non-protein group to form a functional enzyme is a/an
a) Holoenzyme
b) Prosthetic group
c) Apoenzyme
d) None of these

2) Acetyl CoA enzyme belongs to
a) Synthetase
b) Isomerase
c) Desmolase
d) Hydrolase

3) In the process of osmosis in the cell
a) Only the cell wall acts as a membrane
b) Only the outermost layer of protoplasm acts as a membrane
c) Both cell wall and protoplasm act as a membrane
d) The entire protoplast acts as a membrane

4) In electron microscope the higher magnification is due to the use of
a) Higher wavelengths of light
b) High velocity electrons
c) Achromatic lenses
d) Magnetic system

5) Resolving power of a microscope means the capacity to
a) Magnify the image
b) Distinguish between two organelles
c) Distinguish between two objects
d) Distinguish between two close points

6) The magnification of a compound microscope does not depend upon the
a) Focal length of the objective
b) Focal length of the eyepiece
c) Tube length of the microscope
d) Numerical aperture of the objective

7) The ultrastructure of cell organelles can be studied by
a) Light microscopy
b) UV-microscopy
c) Phase contrast microscopy and autoradiography
d) Electron microscopy

8) The higher resolution of an electron microscope is due to the
a) Low wavelength of ultraviolet radiation used as the light source
b) High numerical aperture of a series of glass lenses
c) Powerful electromagnetic lenses
d) Very low wavelength of a beam of electrons

9) The order of sedimentation of subcellular structures during differential centrifugation is
a) Lysosome, mitochondria, ribosome
b) Mitochondria, nucleus, lysosome
c) Nucleus, mitochondria, lysosome
d) Ribosome, nucleus, mitochondria

10) X-ray diffraction technique is used to determine
a) Three dimensional structure of a macromolecule
b) Metabolic events of a biochemical pathway
c) Location of a macromolecule in the cell
d) the arrangement of ribosomes

11) Pure fractions of cellular components can be obtained by
a) X-ray diffraction
b) Chromatography
c) Differential centrifugation
d) Employment of different solvents

12) The fluid mosaic model assumes that the
a) proteins are embedded inside a bilayer of lipids
b) proteins are floating on either face of a bilayer of lipids
c) the membrane is a monolayer of lipid
d) a membrane is a bilayer of lipid floating over proteins

13) Which of the following is not true?
a) Animal cells do not possess plastids
b) Plant cells have a large vacuole
c) Plant cells have cellulosic walls
d) Plant cells have a plasmalemma unlike the animal cells

14) A bouquet stage occurs during
a) Leptotene
b) Zygotene
c) Pachytene
d) Diplotene

15) Bead-like thickened portions of leptotene chromosomes are
a) Puffs
b) Chromomeres
c) Centromeres
d) Genes

16) Meiosis can be studied in angiosperms in
a) Dividing pollen mother cells in anther
b) Dividing cells of vascular cambium
c) Shoot apical meristem
d) root apical meristem

17) The poleward movement of dyads occurs during
a) Anaphase
b) Anaphase I
c) Anaphase II
d) Telophase

18) Mitosis can be studied in
a) Onion root tip
b) Garlic root tip
c) Tendril tip
d) All the above

19) A kinetochore is a
a) Granule within centromere
b) Surface of centromere
c) Constriction near chromosome end
d) End of chromosome

20) A chemical which arrests cell division is extracted from
a) Crocus
b) Colchicum
c) Chrysanthemum
d) Dalbergia

21) Azides and cyanide inhibit
a) Metaphase
b) Prophase
c) Anaphase
d) Telophase

22) A cell divides every minute. It will fill a 100 ml beaker in one hour. How much time would it take to fill a 50 ml beaker?
a) 30 minutes
b) 48 minutes
c) 50 minutes
d) 59 minutes

23) Fibroblast cells in our body are those that are arrested in
a) G0-phase
b) G1-phase
c) G2-phase
d) Yet to start division

24) The major event that occurs during anaphase of mitosis which brings about equal distribution of chromosomes is
a) splitting of centromeres
b) Condensation of chromatin
c) Replication of genetic material
d) Splitting of chromatids

25) In which stage does the synaptinemal complex dissolve, chromatids become clear and bivalents are called tetrads?
a) Zygotene
b) Pachytene
c) Diplotene
d) Diakinesis

26) In blood, the main buffers are
a) Na and K
b) Sodium dihydrogen phosphate and sodium monohydrogen phosphate
c) Carbonic acid and bicarbonate
d) Ammonium acetate

27) The width/distance between two strands of DNA is
a) 34 Å
b) 20 Å
c) 3.4 Å
d) 340 Å

28) An anticodon occurs in
a) DNA
b) tRNA
c) mRNA
d) rRNA

29) In Rice, starch grains are
a) Simple eccentric
b) Simple concentric
c) Compound
d) Dumb-bell shaped

30) A protein having both structural and enzymatic traits is
a) Myosin
b) Collagen
c) Trypsin
d) Actin

31) The enzyme first purified and crystallized was
a) Urease
b) Insulin
c) Diastase
d) Zymase

32) In water, the angle between the atoms of Hydrogen and one atom of Oxygen is
a) 180
b) 104.5
c) 106.5
d) 154.8

33) Two polypeptide chains are joined by hydrogen bonds to produce
a) -helix
b) Tertiary structure
c) -pleated sheet
d) All the above

34) Inulin, found in some plant cells, is
a) Protein
b) Polysaccharide
c) Lipid
d) Vitamin

35) CH3(CH2)7CH=CH(DH2)7, COOH is
a) Linolenic acid
b) Oxalosuccinate
c) Oleic acid
d) -ketoglutarate

36) A nonprotein organic part attached firmly by covalent linkage to an apoenzyme is
a) Cofactor
b) Coenzyme
c) Prosthetic group
d) Activator

37) A ribozyme is a/an
a) Antibiotic
b) Protein enzyme
c) RNA enzyme
d) Hormone

38) The tertiary structure of proteins containing the amino acid cysteine is achieved through
a) Ionic bonds
b) Covalent bonds
c) Disulphide bonds
d) Hydrogen bonds

39) The bond present between two molecules of carbohydrate is
a) Amide
b) Phosphodiester
c) Glycosidic
d) Hydrogen bond

40) The catalytic efficiency of two different enzymes is compared by their
a) Product
b) Molecular size
c) Km value
d) pH optimum value

41) The richest source of protein is
a) Wheat
b) Sago
c) Soyabean
d) Rice

42) Allosteric modulation is die to inhibition of coenzyme action by
a) Competitive inhibition
b) Substrate concentration
c) Procuct of reaction
d) Enzyme concentration

43) CH3 (CH2) 14 COOH is chemical formula of
a) Palmitic acid
b) Stearic acid
c) Glycerol
d) Galactose

44) DNA is very long. It is accommodated in a small nucleus by
a) DNA-ase digestion
b) Super coiling
c) Elimination of repetitive DNA
d) Deletion of nonessential genes

Answers

hourlybook

Related Posts
Leave a reply
What is the capital of Egypt ?