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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)

Correct Answer :

C. (ii) and (iii)


In bacteria, a sticky, gelatinous material called glycocalyx collects outside the cell wall to form an additional surface layer. Glycocalyx covering of the bacterial cell may be loose, thin sheath or thick and tough coat. Loose glycocalyx covering is termed slime layer while tough and thick type is known as capsule.

Related Questions

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4

Match column-I with column-II and choose the correct option.
Column-IColumn-II
(Chromosome)(Position of Centromere)
A. MetacentricI. At the tip
B. SubmetacentricII. Almost near the tip
C. AcrocentricIII. At the middle
D. TelocentricIV. Slightly away from the middle

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

B. A IV; B III; C II; 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

An organalle devoid of membrane covering is

A. vacuole

B. ribosome

C. peroxisome

D. lysosome

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4

The following diagram shows some of the missing structures in a plant cell marked as A, B, C, D E. Choose the option with their correct names.

A. A - Plasmodesmata, B - Rough endoplasmic reticulum, C - Golgi apparatus, D - Mitochondrion, E - Ribosomes

B. A - Desmosome, B - Rough endoplasmic reticulum, C - Golgi apparatus, D - Mitochondrion, E - Ribosomes

C. A - Plasmodesmata, B - Smooth endoplasmic reticulum, C - Golgi apparatus, D - Mitochondrion, E - Ribosomes

D. A - Tight junction, B - Rough endoplasmic reticulum, C - Golgi apparatus, D - Mitochondrion, E -Ribosomes

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4


Which cellular structure helps in transferring genetic information from one generation to another?

A. W

B. X

C. Y

D. Z

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4

Which of the following statements is/are correct ?
  1. The endomembrane system includes plasma membrane, ER, Golgi complex, lysosomes and vacuoles.
  2. ER helps in the transport of substances, synthesis of proteins, lipoproteins and glycogen.
  3. Ribosomes are involved in protein synthesis.
  4. Mitochondria help in oxidative phosphorylation and generation of ATP.

A. (ii), (iii) & (iv)

B. (i) only

C. (ii) only

D. (iii) only

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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 absent in prokaryotes?

A. DNA

B. RNA

C. Plasma membrane

D. Mitochondria

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4

pH of vacuolar cell sap is

A. neutral and isotonic.

B. alkaline and isotonic.

C. acidic and hypertonic.

D. equal to cytoplasm and isotonic.

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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

Select the incorrect statement about prokaryotic ribosomes.

A. 50S and 30S subunits unite to form 70S ribosomes.

B. Polysome/polyribosome consists of many ribosomes only.

C. Ribosome is the site of protein synthesis.

D. Polysome indicate the synthesis of identical poolypeptide in multiple copies.

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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

Given below are some characters of a cell organelle identify the correct organelle which shows all the characters described above.
  1. It is a membrane bound space found in the cytoplasm.
  2. It is bound by a single membrane called tonoplast.
  3. It contains water, sap, excretory products and other materials not useful to the cell.
  4. It has higher concentration of sap than the cytoplasm.

A. Golgi apparatus

B. Lysosomes

C. Endoplasmic reticulum

D. Vacuoles

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4

Nucleolus is

A. rounded structure found in cytoplasm near nucleus.

B. rounded structure inside nucleus and having rRNA.

C. rod-shaped structure in cytoplasm near the nucleus.

D. none of the above.

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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

Identify the cell organelle given below. Which is an important site of formation of glyeoproteins & glycolipids

A. Rough endoplasmic reticulum

B. Smooth endoplasmic reticulum

C. Golgi body

D. mitochondria

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4

Which of the following statements are correct?

A. Na+/K+ pump is an example of active transport.

B. In plant cells lipid like steroidal hormones are synthesized in SER.

C. In plant cells, the vacuoles can occupy up to 10% of the volume of the cell.

D. Chlorophyll and leucoplast are responsible for trapping light energy essential for photosynthesis.

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4

Consider the following statements and choose the correct statement.
  1. The endomembrane system includes mitochondria, chloroplast and peroxisomes.
  2. Smooth endoplasmic reticulum is the major site for synthesis of lipid.
  3. Rough endoplasmic reticulum is actively involved in protein synthesis.
  4. Mitochondrial matrix possesses single circular DNA, a few RNA and 80S ribosomes. Of the above statements.

A. (i) and (iii)

B. (ii) and (iv)

C. (iii) and (iv)

D. (ii) and (iii)

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4

Lysosomes contain

A. carbohydrates

B. hormones

C. nucleic acids

D. hydrolases.

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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

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 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

Both the membranes of mitochondrion are

A. structurally different but functionally similar.

B. structurally as well as functionally different.

C. structurally similar but functionally different.

D. structurally different but functionally similar.

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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

Match column-I (cell organelle) with column-II membrane and select the correct option from the codes given below.
Column-IColumn-II
A. MitochondriaI. Without membrane
B. LysosomesII. Single membrane
C. RibosomesIII. Double membrane

A. A - I, B - II, C - III

B. A - III, B - I, C - II

C. A - III, B - II, C - I

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

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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

The best way to identify a cell as either prokaryotic or eukaryotic is to determine whether

A. it came from a single-celled or multicellular organism.

B. it has a nucleus.

C. it has a plasma membrane.

D. it has cytosol.

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4

Which of the following statements are correct ?
  1. In prokaryotic cells, a special membranous structure formed by the extension of the plasma membrane into the cell is known as polysome.
  2. The smooth endoplasmic reticulum is the major site for synthesis of glycoproteins.
  3. RuBisCO is the most abundant protein in the whole biosphere.
  4. Mitochondria, chloroplasts and peroxisomes are not considered as part of endomembrane system. Of the above statements

A. (iii) and (iv)

B. (i) and (ii)

C. (ii) and (iii)

D. (i) and (iv)

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4

The given figures show two types of cell. Which structures are common to both the cells?

A. Nucleus and cell wall

B. Nucleus and cytoplasm

C. Ribosomes and flagella

D. Ribosomes and cell wall

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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

Select the correct match of the types of neuron present in column I with its location given in column II.
Column IColumn II
A. Centrioles(i) Non-membrane bound organelle which helps in cell division
B. Fimbriae(ii) Special structure of bacteria which help them to attach with rocks in stream and also to host tissue
C. Endomembrane(iii) Includes those organelles system whose functions are coordinated
D. Mitochondria(iv) Divide by fission and site of aerobic respiration

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

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

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

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