Structure of Cell
Multiple Choice Questions and Answers
1. Most abundant chemical substance of middle lamella is
(a) Lignin
(b) Suberin
(c) Cutin
(d) Pectin
Answer: (d) Pectin
2. The chief elements of middle lamella is
(a) calcium
(b) magnesium
(c) sodium
(d) potassium
Answer: (a) calcium
3. Wall of young plant cells is mainly composed of
(a) starch
(b) glycogen
(c) protein
(d) cellulose
Answer: (d) cellulose
4. Fluid mosaic model of cell membrane believes that it has slipped bilayer with
(a) proteins on both the surfaces
(b) proteins on the outer surface only
(c) proteins embedded in it only
(d) some proteins embedded and some on the surface
Answer: (d) some proteins embedded and some on the surface
5. The size of molecules which can pass through plasmalemma passively is
(a) 10-15 angstrom
(b) 15-35 angstrom
(c) 35-75 angstrom
(d) 8-10 angstrom
Answer: (d) 8-10 angstrom
6. Fluid mosaic model of cell membrane was proposed by
(a) Robertson
(b) Danielli and Davson
(c) Singer and Nicolson
(d) Watson and Crick
Answer: (c) Singer and Nicolson
7. Which is true about active and passive transport?
(a) active transport is more rapid
(b) active transport requires energy while passive transport follows concentration gradient
(c) active transport is connected with cations while passive transport is related to anions
(d) active transport is non selective and passive transport is selective
Answer: (b) active transport requires energy while passive transport follows concentration gradient
8. Ribosome is centre of
(a) fat synthesis
(b) protein synthesis
(c) respiration
(d) synthesis of RNA
Answer: (b) protein synthesis
9. Rough endoplasmic reticulum is well developed in cells engaged in active
(a) lipid synthesis
(b) secretory function
(c) nucleotide synthesis
(d) protein synthesis
Answer: (d) protein synthesis
10. Ribosomes are attached to ER through
(a) Ribophorins
(b) rRNA
(c) tRNA
(d) hydrophobic interaction
Answer: (a) Ribophorins
11. Eukaryote 80s ribosome have two subunits of
(a) 40S+40S
(b) 60S+40S
(c) 60S+50S
(d) 50S+30S
Answer: (b) 60S+40S
12. In nature the ribosomes of plastids, mitochondria, bacteria and other prokaryotes are
(a) 70S
(b) 80S
(c) 60S
(d) 90S
Answer: (a) 70S
13. Peroxisomes are associated with
(a) photorespiration
(b) photoperiodism
(c) phototropism
(d) photosynthesis
Answer: (a) photorespiration
14. Organelle having flattened cisternae near the nucleus is
(a) mitochondrion
(b) nucleolus
(c) centrosome
(d) Golgi apparatus
Answer: (d) Golgi apparatus
15. Nucleolus takes part in synthesis of
(a) DNA
(b) mRNA
(c) t RNA
(d) rRNA
Answer: (d) rRNA
16. Organelle connected with proteins synthesis is
(a) chloroplast
(b) ribosome
(c) pyrenoid
(d) mitochondrion
Answer: (b) ribosome
17. The term thylakoid was coined by
(a) Menke
(b) Arron
(c) Park
(d) Willstatter
Answer: (a) Menke
18. Thylakoids are found inside
(a) endoplasmic reticulum
(b) chloroplast
(c) Golgi apparatus
(d) mitochondria
Answer: (b) chloroplast
19. Membrane covering vacuole is
(a) plasmalemma
(b) tonoplast
(c) cell membrane
(d) middle lamella
Answer: (b) tonoplast
20. Organelle involved in membrane transformation is
(a) Lysosome
(b) Mesosome
(c) Golgi body
(d) ER
Answer: (c) Golgi body
21. Desmosomes are connected with
(a) cell adherence
(b) cell excretion
(c) cell division
(d) cytolysis
Answer: (a) cell adherence
22. Action potential on outer surface of plasma membrane is
(a) positive
(b) neutral
(c) variable
(d) negative
Answer: (d) negative
23. Two animal cells are interconnected by
(a) cell wall
(b) plasma membrane
(c) desmosomes
(d) plasmodesmata
Answer: (c) desmosomes
24. Plasmalemma is formed of
(a) Single lipid layer
(b) Single protein layer
(c) Single protein layer and single lipid layer
(d) Single protein layer and two protein layers
Answer: (d) Single protein layer and two protein layers
25. Smooth endoplasmic reticulum synthesizes
(a) proteins
(b) carbohydrates
(c) steroids and lipids
(d) nucleic acid
Answer: (c) steroids and lipids
26. Polymorphic cell organelle is
(a) glyoxysome
(b) golgi complex
(c) lysosomes
(d) peroxisomes
Answer: (c) lysosomes
27. Mitochondria are absent in
(a) green algae
(b) bacteria
(c) red algae
(d) brown algae
Answer: (b) bacteria
28. Organelle is covered by single membrane is
(a) lysosome
(b) peroxisomes
(c) glyoxysomes
(d) all the above
Answer: (d) all the above
29. Enzymes for changing fats to carbohydrates occur in a
(a) Golgi apparatus
(b) glyoxysomes
(c) lysosomes
(d) spherosomes
Answer: (b) glyoxysomes
30. Larger subunit of 80S ribosome is
(a) 30S
(b) 40S
(c) 50S
(d) 60S
Answer: (d) 60S
31. Type of enzymes present in lysosome is
(a) ligases
(b) hydrolases
(c) lysases
(d) transferases
Answer: (b) hydrolases
32. Carrier proteins are connected with
(a) water transport
(b) active transport
(c) passive transport
(d) facilitated transport
Answer: (b) active transport
33. Phospholipids are
(a) amphipathic
(b) amphibolic
(c) hydrophobic
(d) hydrophilic
Answer: (a) amphipathic
34. Fine projections found on the free surface of absorptive cells are
(a) microfilaments
(b) microvilli
(c) cilia
(d) plasmodesmata
Answer: (b) microvilli
35. Thickness of biomembrane is
(a) 7-6 micrometer
(b) 7-9 nanometer
(c) 70-90 angstrom
(d) all the above
Answer: (d) all the above
36. Movement of ions against electrochemical gradient is
(a) pinocytosis
(b) passive transport
(c) active transport
(d) diffusion
Answer: (c) active transport
37. A semi autonomous organelle is
(a) lysosome
(b) peroxysome
(c) chloroplast
(d) endoplasmic reticulum
Answer: (c) chloroplast
38. Amyloplasts are connected with storage of
(a) starch
(b) glycogen
(c) fat
(d) protein
Answer: (a) starch
39. Centre of phosphorylation is
(a) peroxisomes
(b) ribosome
(c) oxysome
(d) sphaerosome
Answer: (c) oxysome
40. Glycosidation of protein occurs over
(a) chloroplast
(b) ribosome
(c) mitochondrion
(d) ER
Answer: (d) ER
41. Membrane proteins are
(a) cellulases
(b) lysases
(c) permeases
(d) all the above
Answer: (c) permeases
42. Mitochondria are semi-autonomous due to presence of
(a) proteins
(b) DNA
(c) DNA+ RNA
(d) DNA+RNA+ ribosomes
Answer: (d) DNA+RNA+ ribosomes
43. Tubulin occurs in
(a) microtubules
(b) cilia and flagella
(c) microvilli
(d) both a and b
Answer: (d) both a and b
44. Microtubules do not occur in
(a) mitochondria
(b) centrioles
(c) spindle fibres
(d) flagella
Answer: (a) mitochondria
45. The term nucleolus was coined by
(a) Flemming
(b) Bowman
(c) Fontana
(d) Strasburger
Answer: (b) Bowman
46. Ribosomes are granules formed of
(a) rRNA+tDNA
(b) mRNA+tRNA
(c) rRNA+proteins
(d) mRNA+proteins
Answer: (c) rRNA+proteins
47. Lysosomes take part in
(a) intracellular digestion
(b) extracellular digestion
(c) fat breakdown
(d) both a and b
Answer: (d) both a and b
48. Lipid molecules of plasma membrane occur
(a) parallel
(b) scattered
(c) alternately
(d) in series
Answer: (a) parallel
49. Chromosome carrying centromeres at one end is
(a) metacentric
(b) submetacentric
(c) acrocentric
(d) telocentric
Answer: (d) telocentric
50. Eukaryotic ribosomes are
(a) 70S
(b) 80S
(c) 50S
(d) 30S
Answer: (b) 80S