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4

Select the statements which are related to Schwann.
  1. He reported that cells have a thin outer layer which is today known as plasma membrane
  2. Cell wall is a unique character of the plant cell.
  3. Body of plants and animals are composed of cells and products of cells.

A. Only (i)

B. Only (iii)

C. (i) and (iii)

D. All of these

Correct Answer :

D. All of these


All the given statements are related to Schwann Theodor. Schwann was a German physiologist. His contributions to biology include the development of cell theory, the discovery of Schwann cells in the peripheral nervous system, the discovery and study of pepsin, the discovery of the organic nature of yeast, and the invention of the term metabolism.

Related Questions

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4

Difference between the prokaryotic and eukaryotic cells in having

A. cell wall

B. nuclear membrane

C. ribosome

D. none of these

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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

Which of the following is not the function of cell wall?
  1. Provides shape to the cell.
  2. Protects the cell from mechanical damage and infection.
  3. Helps in cell to cell interaction.
  4. Provides barrier to undesirable macromolecules.

A. Only (i)

B. Only (iv)

C. Only (ii), (iii) and (iv)

D. None of the above

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4

Which one of the following combination is mismatched?

A. Glycocalyx May be capsule or slime layer

B. Pili Reproduction

C. Cell wall Protective, determines shape, prevents from bursting

D. Flagella, pili and fimbriae Surface structures of bacterial cell

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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

Grana are

A. protein storing plastids.

B. coloured plastids.

C. stacks of thylakoids.

D. individual thylakoids present in stroma.

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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

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

Which one of the following structures between two adjacent cells is an effective transport pathway?

A. Plasmodesmata

B. Plastoquinones

C. Endoplasmic reticulum

D. Plasmalemma

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4

Active transport across biomembrane involves

A. production of ATP

B. requirement of energy

C. production of toxin

D. release of energy

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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

Integral proteins of cell membrane occur on/in

A. inner surfaces

B. outer surfaces

C. phospholipid matrix

D. inner and outer surfaces

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4

Basal bodies are associated with the formation of

A. phragmoplast

B. cilia and flagella

C. cell plate

D. kinetochore

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4

Which of the following lacks cell wall?

A. Gametes

B. Amoeba

C. Mycoplasma

D. All of these

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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

In prokaryotes, chromatophores are

A. specialized granules responsible for colouration of cells

B. structures responsible for organizing the shape of the organism.

C. inclusion bodies lying free inside the cells for carrying out various metabolic activities.

D. internal membrane system which becomes extensive and complex in photosynthetic bacteria.

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4

Which of these is wrongly matched?

A. Chloroplasts Chlorophyll

B. Elaioplasts Starch

C. Chromoplasts Carotenoids

D. Amyloplasts Carbohydrates

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4

According to widely accepted fluid mosaic model cell membranes are semi-fluid, where lipids and integral proteins can diffuse randomly. In recent years, this model has been modified in several respects. In this regard, which of the following statements is incorrect?

A. Proteins in cell membranes can travel within the lipid bilayer.

B. Proteins can also undergo flip-flop movements in the lipid bilayer.

C. Proteins can remain confined within certain domains of the membrane.

D. Many proteins remain completely embedded within the lipid bilayer.

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4

The cytoskeleton is a proteinaceous network of fibres in the cytoplasm. It is involved in

A. mechanical support.

B. motility.

C. maintenace of cell-shape.

D. all of the above

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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

Which of the following option correctly match A, B, C, and D indicated in the given sectional view of chloroplasts.

A. A - Thylakoid, B-Stromal lamella, C - Stroma, D - Granum

B. A - Granum, B - Thylakoid, C - Stromal lamella, D - Stroma

C. A - Thylakoid, B - Granum, C - Stromal lamella, D - Stroma

D. A - Granum, B - Thylakoid, C - Stroma, D - Stromal lamella

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4

_______________ is the important site of formation of glycoproteins and golycolipids.

A. SER

B. Lysosome

C. Golgi apparatus

D. Mitochondria

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4

Plastids storing fat are called

A. Elaioplasts

B. Sphaerosomes

C. Aleuroplasts

D. Pyrenoids

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4

In which of the following the cells are held together by a Ca-pectate layer?

A. Primary cell wall

B. Secondary cell wall

C. Middle lamella

D. Tertiary cell wall

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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

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

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

Polysome is a chain of

A. oxysomes

B. sphaerosomes

C. ribosomes

D. dictyosomes

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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

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

A. Mohl

B. Virchow

C. Haeckel

D. Brown