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1009 available questions

Biology · Question 931

Which statement is not true for viruses?

  1. They are non-cellular infectious entities
  2. They live independently outside their hosts
  3. They contain either RNA or DNA
  4. They are usually enclosed in a protein coat
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Correct answer: B

They live independently outside their hosts

The correct answer is They live independently outside their hosts.

Biology · Question 932

Against which viral disease was the first effective preventive vaccine developed?

  1. Polio
  2. Smallpox
  3. Herpes simplex
  4. Mumps and measles
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Correct answer: B

Smallpox

The correct answer is Smallpox.

Biology · Question 933

Historically, 'unseen filterable agents' of disease referred to:

  1. Bacteria
  2. Viruses
  3. Vectors
  4. Ticks and mites
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Correct answer: B

Viruses

The correct answer is Viruses.

Biology · Question 934

A viral genome is composed of:

  1. DNA only
  2. RNA only
  3. DNA or RNA
  4. DNA, RNA and protein
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Correct answer: C

DNA or RNA

The correct answer is DNA or RNA.

Biology · Question 935

In the viral life cycle, adsorption means:

  1. Receptor site
  2. Penetration
  3. Attachment
  4. Lysis
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Correct answer: C

Attachment

The correct answer is Attachment.

Biology · Question 936

Which ancient disease is caused by an enveloped DNA virus?

  1. Smallpox
  2. Poliomyelitis
  3. Influenza
  4. Measles
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Correct answer: A

Smallpox

The correct answer is Smallpox.

Biology · Question 937

Which lipid is generally absent from bacterial cell membranes?

  1. Wax
  2. Sterols
  3. Phospholipids
  4. Acylglycerol
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Correct answer: B

Sterols

The correct answer is Sterols.

Biology · Question 938

Which feature is common to both bacteria and viruses?

  1. Binary fission
  2. Nucleic acid as genetic material
  3. Mitosis
  4. Ribosomes
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Correct answer: B

Nucleic acid as genetic material

The correct answer is Nucleic acid as genetic material.

Biology · Question 939

Microaerophilic bacteria can grow:

  1. Only in the complete absence of oxygen
  2. At normal atmospheric oxygen levels
  3. At either zero or normal oxygen levels
  4. At very low oxygen concentrations
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Correct answer: D

At very low oxygen concentrations

The correct answer is At very low oxygen concentrations.

Biology · Question 940

Bacteria commonly increase in number asexually by:

  1. Mitosis
  2. Binary fission
  3. Conjugation
  4. Lag phase
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Correct answer: B

Binary fission

The correct answer is Binary fission.