Which of the following statements is true?
a. Viruses move toward their host cells.
b. Viruses are capable of metabolism.
c. Viruses lack a cytoplasmic membrane.
d. Viruses grow in response to their environmental conditions.

Guida verificata passo dopo passo

Step 1: Understand the nature of viruses. Viruses are acellular entities that require a host cell to replicate and do not carry out independent metabolic processes.

Step 2: Analyze option (a): 'Viruses move toward their host cells.' Viruses do not have motility structures and cannot move actively; they rely on passive mechanisms to come into contact with host cells.

Step 3: Analyze option (b): 'Viruses are capable of metabolism.' Viruses lack the cellular machinery necessary for metabolism and depend entirely on the host cell's metabolic systems.

Step 4: Analyze option (c): 'Viruses lack a cytoplasmic membrane.' Unlike cells, viruses do not have a cytoplasmic membrane; they are typically composed of a protein coat (capsid) and sometimes a lipid envelope derived from the host.

Step 5: Analyze option (d): 'Viruses grow in response to their environmental conditions.' Viruses do not grow or increase in size; they assemble from components synthesized inside the host cell.

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Virus Structure

Viruses are composed of genetic material (DNA or RNA) enclosed in a protein coat called a capsid. Unlike cells, they lack a cytoplasmic membrane, which is a lipid bilayer found in cellular organisms. This structural difference is key to distinguishing viruses from living cells.

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Introduction to Animal Virus Infections

Viral Metabolism

Viruses do not possess metabolic machinery and cannot carry out metabolic processes on their own. They rely entirely on host cells to provide energy and molecular components for replication, making them metabolically inert outside a host.

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Introduction to Metabolism

Viral Movement and Growth

Viruses do not move actively toward host cells; instead, they rely on passive mechanisms like diffusion or host movement. Additionally, viruses do not grow or change size; they assemble from preformed components inside host cells rather than growing in response to environmental conditions.

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