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Earn 100

Which among the following is/are correct about Escherichia coli?
(a)It is gram-negative
(b)It is gram-positive
(c)It cannot cause illness outside the intestinal tract
(d)It is a common inhabitant of human intestines
(e)It is rod-shaped

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Important Questions on Biological Classification
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Match the following lists:
List-I | List-II | ||
(A) | Photoautotroph | (I) | Nitrosomonas |
(B) | Chemoautotroph | (II) | Rhodospirillum |
(C) | Photoheterotroph | (III) | Salmonella |
(D) | Chemoheterotroph | (IV) | Chlorobium |
The correct match is:

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I. Cyanobacteria are referred to as blue-green algae.
II. They perform oxygenic photosynthesis in chloroplasts.
II. The red-colour of red-sea is due to the presence of a cyanobacterial species Trichodesmium erythraeum.
IV. All the cyanobacterial species can fix atmospheric in specialised cells called heterocysts.

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Bacteria are grouped under four categories based on their shape. Study the given figure and identify A. B. C and D?

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