Pigment-containing extensions in some cyanobacteria are

(1) heterocysts

(2) basal bodies

(3) pneumatophores

(4) chromatophores

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Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen?

(a) Bacillus

(b) Pseudomonas

(c) Mycoplasma

(d) Nostoc

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Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP?

(a) Lysosome

(b) Ribosome

(c) Chloroplast

(d) Mitochondrion

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Which of the following components provides sticky character to the bacterial cell?

(a) Cell wall

(b) Nuclear membrane

(c) Plasma membrane

(d) Glycocalyx

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Select the mismatch.

1. Gas vacuoles — Green bacteria Cells

2. Large central vacuoles — Animal cells

3. Protists — Eukaryotes

4. Methanogens — Prokaryotes

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Select the wrong statement.

(a) Bacterial cell wall is made up of peptidoglycan

(b) Pili and fimbriae are mainly involved in motility of bacterial cells

(c) Cyanobacteria lack flagellated cells

(d) Mycoplasma is a wall-less microorganism

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A cell organelle containing hydrolytic enzyme is

(a) lysosome                         (b) microsome

(c) ribosome                         (d) mesosome

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Microtubules are the constituents of

(a) spindle fibres, centrioles and cilia

(b) centrioles, spindle fibres and chromatin

(c) centrosome, nucleosome and centrioles

(d) cilia, flagella and peroxisomes

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Mitochondria and chloroplast are

I.semi-autonomous organelles.

II. formed by division of pre-existing organelles and they contain DNA but lack protein synthesizing machinery.

Which one of the following options is correct?

(a) Il is true but I is false

(b) I is true but ll is false

(c) Both I and I are false

(d) Both I and II are correct

 

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A complex of ribosomes attached to a single strand of RNA is known as

(a) polymer

(b) polypeptide

(C) okazaki fragment

(d) polysome

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