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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Which of the following is not a feature of the plasmids?

(a) Circular structure

(b) Transferable

(c) Single-stranded

(d) Independent replication

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Water soluble pigments found in plant cell vacuoles are

(a) chlorophylls

(b) carotenoids

(c) anthocyanins

(d) xanthophylls

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Which of the following statements is not true for cancer cells in relation to mutations?

(a) Mutations destroy telomerase inhibitor

(b) Mutations inactivate the cell control

(c) Mutations inhibit production of telomerase

(d) Mutations in proto-oncogenes accelerate the cell cycle

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