Cell - The Unit of Life (10-05-23)

Unicellular organisms are –

• (a) Not capable of independent existence because they cannot perform all the essential functions of life

• (b) Not capable of independent existence but they can perform all the essential vital functions

• (c) Are capable of independent existence and perform all the essential vital functions

• (d) Are capable to lead independent existence but they perform some vital functions

Select the incorrect statement –

• (a) Any thing less than a complete structure of a cell does not ensure independent living

• (b) Anton Von Leeuwenhock first saw and described a living cell

• (c) Robert Brown discovered cell

• (d) Cell is the basic unit of structure and function of all organisms

Cell is the fundamental structural and functional unit of all living organisms is evidenced by the facts like –

• (a) Any thing less than a complete structure of a cell does not ensure independent living

• (b) Subcellular components can regenerate whole cell

• (c) A cell arises by fusion of two cells

• (d) All cells are totipotent

Select the right option which relates to Schwann regarding the following statement –

I. He reported that cells have a thin outer layer which is today known as plasma membrane

II. Cell wall is a unique character of the plant cell

III. Body of plants and animals are composed of cells and products of cells

• (a) All are correct

• (b) Only III is correct

• (c) II and III are correct

• (d) All are incorrect

Which of the following statements was not explained in the cell theory given jointly by Schleiden and Schwann?

• (a) All living organisms are composed of cells and products of cells

• (b) Cell is the structural and functional unit of living organisms

• (c) Explanation of formation of new cells

• (d) None

Choose the wrong option –

• (a) Mycoplasma is the smallest cell (0.3 m in length)

• (b) Bacteria are 3 to 5 m

• (c) The largest cell is the egg of an ostrich

• (d) Nerve cells are some of the smallest cells

Go through the following statements and then select correct option(s) for prokaryotic cells –

I. They are generally smaller than eukaryotic cells

II. They multiply more rapidly than the eukaryotic cells

III. They are presented by bacteria, B. G. A, mycoplasma and PPLO (Pleuro Pneumonia like organism)

• (a) All

• (b) II and III

• (c) Only III

• (d) I and III

All the statements are correct except –

• (a) The organization of the prokaryotic cells is fundamentally similar

• (b) Prokaryotes show a wide variety of shapes and functions

• (c) Few prokaryotes have cell walls

• (d) There is no well-defined nucleus

Organization of a cell has not been achieved in –

• (a) Bacteria

• (b) Bacteriophage

• (c) Amoeba

• (d) Diatom

Which of the following is (are) exception(s) to the cell theory –

• (a) Viruses

• (b) Viriods

• (c) Prions

• (d) All