Ücretsiz Kullanmaya Başla

Viruses Knowledge-Based Practice

Biology · Diversity of Life · Biology · Microorganisms & Viruses

5 Biology practice questions on Viruses. Questions that assess core concepts and understanding.

Layout:

Choose how questions appear in the preview and test.

Preview the questions below, then start to answer and see your results.

Questions

  1. 1.

    Which viral component is primarily responsible for determining host range and tissue tropism by binding to specific receptor molecules on the host cell surface?

    • A) Surface proteins or glycoproteins projecting from the virion
    • B) Phospholipid molecules forming the viral membrane bilayer
    • C) Enzymes enclosed within the interior of the viral capsid
    • D) Internal scaffolding proteins that maintain nucleocapsid geometry
  2. 2.

    Which enzyme enables a retrovirus to synthesize a complementary DNA strand using its viral RNA genome as a template?

    • A) DNA ligase
    • B) RNA-dependent RNA polymerase
    • C) Reverse transcriptase
    • D) DNA-dependent RNA polymerase
  3. 3.

    Which of the following events is characteristic of the lysogenic cycle of a temperate bacteriophage?

    • A) The viral genome immediately directs the degradation of host DNA to synthesize progeny virions.
    • B) Progeny virions are continuously released across the bacterial plasma membrane by exocytosis.
    • C) The viral DNA integrates into the host chromosome and replicates alongside the bacterial genome as a prophage.
    • D) The viral envelope fuses with the peptidoglycan layer to stimulate rapid bacterial cell division.
  4. 4.

    Why are conventional antibiotics, which target bacterial structures and metabolic processes, ineffective against viral infections?

    • A) Viruses rapidly alter their plasma membranes to prevent antibiotic molecules from penetrating.
    • B) Viruses secrete extracellular digestive enzymes that degrade antibiotic molecules before infection.
    • C) Viruses lack cellular structures and autonomous metabolic pathways, relying on host machinery.
    • D) Viruses possess specialized protein channels that actively pump antibiotics out using viral ATP.
  5. 5.

    Which of the following characteristics is common to all virions across different viral families?

    • A) A lipid envelope derived from the host cell plasma membrane
    • B) Independent ribosomes for synthesizing structural viral proteins
    • C) A double-stranded DNA genome paired with metabolic enzymes
    • D) A nucleic acid genome enclosed within a protein coat known as a capsid

Answers and step-by-step solutions appear after you finish the test.