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4

Which of the following will determines the shape of the cells and provides a strong structural support to prevent the bacterium from bursting or collapsing?

A. Plasmids

B. Cell wall

C. Mesosome

D. Cell membrane

Correct Answer :

B. Cell wall


Cell wall is a very tough, flexible and rigid layer that surrounds the cell membrane. Cell wall determines the shape of the cells and provides a strong structural support to prevent the bacterium from bursting or collapsing.

Related Questions

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4

In the given figure of animal cell, one orginelle is marked as A. Select the correct identification and function of the organelle A from the given option.

A. Endoplasmic reticulum Synthesis of lipids.

B. Mitochondria Produce cellular energy in the form of ATP.

C. Golgi body Provides packaging material.

D. Lysosomes Secrete hydrolytic enzymes.

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4

The membrane of the erythrocytes has approximately ___% of proteins and ___% lipids.

A. 42, 50

B. 52, 40

C. 50, 50

D. 60, 40

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4

Match column-I and column-II and select the correct answer
Column-IColumn-II
A. Bacteria without wallsI. Lysosome
B. Small circular DNAII. Mycoplasma cells
C. Flattened sacs inIII. Thylakoid a chloroplast
D. A vesicle in whichIV. Plasmid hydrolytic enzymes are stored

A. A III; B IV; C II; D I

B. A II; B IV; C III; D I

C. A I; B II; C III; D IV

D. A IV; B III; C I ; D II

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4

Golgi apparatus is concerned with

A. excretion

B. secretion

C. ATP synthesis

D. RNA synthesis

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4

Which one of the following is not considered as part of the endomembrane system?

A. Golgi complex

B. Peroxisome

C. Vacuole

D. Lysosome

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4

Golgi apparatus is absent in

A. higher plants

B. yeast

C. bacteria and blue-green algae

D. None of the above

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4

Read the folowing statements and identify the correct option.
  1. Contractile vacuole takes part in osmoregulation and excretion.
  2. Food vacuole is formed by engulfing the food particles.
  3. The vacuole is bound by a double membrane called tonoplast.
  4. Vacuole can occupy upto 90 percent of the volume of the cell.

A. (i) and (ii)

B. (ii) and (iv)

C. (i), (ii) and (iv)

D. None of the above

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4

The lipid component of the membrane mainly consists of __________.

A. polysaccharides

B. phosphoglyceride

C. monosaccharaides

D. both (a) and (c)

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4

Match the items given in column-I with their role given in column-II and choose the correct option.
Column-IColumn-II
A. SERI. Increase the surface area
B. Golgi apparatusII. Store oils or fats
C. CristaeIII. Excretion
D. PeroxisomeIV. Photorespiration
E. ElaioplastsV. Synthesis of lipid

A. A V; B III; C I; D IV; E II

B. A V; B III: C II; D IV; E I

C. A II; B III; C I; D IV; E V

D. A III; B IV; C I; D V; E II

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4

The diagram given below represent a filuid mosaic model of plasma membrance. Match the components marked as A, B, C, D and E in the diagram below from the list (i) to (vii).

  1. Sugar
  2. Protein
  3. Lipid bilayer
  4. Integral protein
  5. Cytoplasm
  6. Cell wall
  7. External protein

A. A - (i), B - (ii), C - (iii), D - (iv), E - (v)

B. A - (ii), B - (i), C - (iii), D - (iv), E - (v)

C. A - (i), B - (ii), C - (iii), D - (iv), E - (vi)

D. A - (i), B - (ii), C - (iii), D - (vii), E - (v)

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4

In which method of transport, plasma membrane does not require carrier molecule?

A. Active transport

B. Facilitated diffusion

C. Simple diffusion

D. Na+ K+ pump

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4

Which of the following is incorrect ?

A. Mycoplasma is the smallest cell (0.3 �).

B. Bacteria are 3 to 5 �m in size.

C. The largest cell is the egg of an ostrich.

D. Nerve cells are some of the smallest cells.

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4

Active transport differs from passive transport in that active transport

A. requires energy.

B. always requires input of ATP.

C. moves molecules against a concentration gradient.

D. both (a) and (c)

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4

Read the statements given below with regard to the functions performed by Golgi apparatus ?
  1. Transport and chemically modify the materials contained within it.
  2. Performs the function of packaging materials.
  3. Important site of formation of glycoproteins and glycolipids.

Which of the following is the correct answer ?

A. (i) is wrong but (ii) and (iii) are correct

B. (ii) is wrong but (i) and (iii) are correct

C. (ii) and (iii) are wrong but (i) is correct

D. All are correct.

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4

Who proposed the theory that Cells arise only from the pre-existing cells?

A. Mohl

B. Virchow

C. Haeckel

D. Brown

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4

Which of the following statements is/are correct ?
  1. The shape of the cells may vary with the function they perform.
  2. Human RBC is about 7.0 ??m in diameter.
  3. Cytoplasm is the main area of cellular activities.
  4. Various chemical reactions occur in cytoplasm to keep the cell in the living state.

A. (i), (ii), (iii) and (iv)

B. Only (i) and (ii)

C. Only (iv)

D. None of the above

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4

Choose the wrong statements regarding bacterial cell
  1. Glycocalyx is the outermost envelope in bacteria.
  2. The glycocalyx could be a loose sheath called capsule.
  3. The glycocalyx may be thick and tough called slime layer.
  4. A special structure formed by the plasma membrane is called mesosome.
  5. Small bristle like fibres sprouting out of the cell are called fimbriae.

A. (i) and (iii)

B. (i) and (ii)

C. (ii) and (iii)

D. (i) and (iv)

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4

The following diagram represents a structure chromosome.
Identify the structures marked as A, B and C.

A. A - Satellite, B - Primary constriction, C - Acrocentric

B. A - Satellite, B - Secondary constriction, C - Metacentric

C. A - Satellite, B - Centromere, C - Telocentric

D. A - Satellite, B - Centromere, C - Submetacentric

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4

Match column-I with column-II and choose the correct option.
Column-IColumn-II
A. TonoplastI. Contain digestive enzyme
B. Contractile vacuoleII. Store metabolic gases
C. Food vacuoleIII. Excretion
D. Air vacuoleIV. Transport of ions in plants

A. A IV; B III; C I; D II

B. A II; B III; C IV; D I

C. A IV; B II; C III; D I

D. A I; B III; C II; D IV

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4

Plastids are found in

A. all animal cells.

B. some animal cells.

C. all plant cells.

D. all plant cells and euglenoides.

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4

Which of the following pair lack the unit membrane?

A. Nucleus and E.R.

B. Mitochondria and chloroplast

C. Ribosome and nucleolus

D. Golgi body and lysosome

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4

Which of the following pair are correctly matched ?
(I) Amyloplasts Store proteins
(II) Mitochondrion Power house of the cell
(III) Stroma Chlorophyll pigment
(IV) Axoneme 9 + 2 array

A. (I) and (III) only

B. (II), (III) and (IV) only

C. (III) and (IV) only

D. (II) and (IV) only

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4

Protein synthesis in an animal cell occurs

A. on ribosomes present in cytoplasm as well as in mitochondria.

B. on ribosomes present in the nucleolus as well as in cytoplasm.

C. only on ribosomes attached to the nuclears envelope and endoplasmic reticulum.

D. only on the ribosomes present in cytosol.

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4

Which of the following statements are incorrect ?
  1. Plant cells have centrioles which are absent in almost all animal cells.
  2. Ribosomes are the site of protein synthesis.
  3. The middle lamella is a layer mainly of calcium carbonate which holds the different neighbouring cells together.
  4. In animal cell, steroidal hormones are synthesized by smooth endoplasmic reticulum. Of the above statements

A. (i) and (iii)

B. (iii) and (iv)

C. (ii) and (iv)

D. (i) and (iv)

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4

Identify the components labelled as A, B, C, D and E in the diagram given below from the list (i) to (viii).

  1. Cristae of mitochondria
  2. Inner membrane of mitochondria
  3. Cytoplasm
  4. Smooth endoplasmic reticulum
  5. Rough endoplasmic reticulum
  6. Mitochondrial matrix
  7. Ribosome
  8. Nucleus

A. A - (viii), B - (v), C - (vii), D - (iii), E - (iv)

B. A - (i), B - (iv), C - (vii), D - (vi), E - (iii)

C. A - (vi), B - (v), C - (iv), D - (vii), E - (i)

D. A - (v), B - (i), C - (iii), D - (ii), E - (iv)

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4

Match column I (cell type) with column II (size) and choose the correct option.
Column-IColumn-II
(Cell type)(Size)
A. VirusesI. 1-2 ??m
B. PPLOII. 10-20 ??m
C. Eukaryotic cellIII. About 0.1 ??m
D. BacteriumIV. 0.02 - 0.2 ??m

A. A I, B II, C III, D IV

B. A IV, B III, C II, D I

C. A I, B III, C II, D IV

D. A IV, B II, C III, D I

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4

Match column-I with column-II and select the correct option.
Column - IColumn - II
A. RERI. Intracellular and extracellular digestion
B. Cell wallII. Provide structural support to the cell
C. FlagellaIII. Protein synthesis and secretion
D. LysosomesIV Responsible for cell movement

A. A III, B II, C IV, D I

B. A II, B III, C IV, D I

C. A I, B III, C II, D IV

D. A IV, B II, C III, D I

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4

Which of the following statement of a bacterial cell is/are correct?
  1. Mesosome is formed by the extensions of plasma membrane into the cell.
  2. The pili are elongated tubular structures made up of a protein.
  3. Flagellum is composed of filament, hook and basal body.
  4. Ribosomes are about 30 nm by 50 nm in size.

A. (i), (ii), (iii)

B. All of the above

C. (ii) & (iv)

D. None of the above

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4

A student placed two cells in the same solution in two different containers. The observation was given in the table.
ContainerObservation
1Cell burst
2Cell does not change its shape

Which structure maintains the shape of the cell present in container 2 and provides the most significant difference between the two cells?

A. Nucleus

B. Cell wall

C. Chloroplast

D. Cell membrane

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4

Centrioles and centrosomes occur in the cells of

A. green plants

B. animals

C. bacteria and cyanobacteria

D. both (b) and (c)