Structure of Cell (Multiple Choice Questions and Answers)

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