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Bacteriophages and Viral Structure

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Questions and Answers

What type of virus is bacteriophage?

A bacteria that infects other than bacteria

A virus that infects bacteria (correct)

A virus that infects cellular organisms

A bacteria that infects viruses

What is the shape of the head of a bacteriophage?

Polyhedral

Icosahedral

Helical

Both Polyhedral and Helical (correct)

What is the protein coat of a virus composed of?

Capsomere, which is made up of small subunits called capsid

Capsid, which is made up of small subunits called capsomere (correct)

Capsid, which is made up of small subunits called protein

Capsomere, which is made up of small subunits called genetic material

Who discovered viroids?

T.O. Diener in 1971 Signup and view all the answers

What is the correct order of size from smallest to largest?

Viroid < virus < bacteria Signup and view all the answers

What causes BSE in cattle and CJD in humans?

Prions Signup and view all the answers

Which of the following characteristics is NOT common to all bacteria?

Lack of cell wall Signup and view all the answers

What is the incorrect statement about chemosynthetic autotroph bacteria?

They use solar energy for ATP production Signup and view all the answers

What is citrus canker?

A plant disease caused by bacteria Signup and view all the answers

Which of the following is NOT an economic importance of heterotrophic bacteria?

N2 fixing in Anabaena Signup and view all the answers

What is the correct labelling for A, B and C?

A = Heterocyst, B = Mucilagenous sheath, C = Nostoc Signup and view all the answers

Which of the following is a characteristic of blue-green algae?

Presence of chlorophyll a and b Signup and view all the answers

What was the basis of classification of organisms like bacteria, BGA, fungi, mosses, and ferns as 'Plants'?

Body organisation and nuclear structure Signup and view all the answers

How many of the following are prokaryotes: Bacteria, Mosses, Ferns, Fungi, Pteridophyta, blue green algae, Gymnosperms Angiosperm?

More than 4 Signup and view all the answers

On what basis are bacteria grouped into categories?

Shape Signup and view all the answers

What type of nutrition is exhibited by organisms that synthesize their own food from inorganic substrates?

Autotrophic nutrition Signup and view all the answers

What is the correct statement about bacterial structure and behaviour?

Bacterial structure is simple while behaviour is complex. Signup and view all the answers

What is the shape of bacteria represented by 'a' in the given options?

Cocci Signup and view all the answers