Multiple Choice
Which two viruses are known to infect all vertebrate groups featured in the 'Click & Learn' activity?
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1. Introduction to Microbiology
Acellular Infectious Agents: Viruses, Viroids & Prions
Multiple Choice
Which of the following is an acellular infectious agent that lacks a nucleus?
A
Virus
B
Fungus
C
Protozoan
D
Bacterium
Verified step by step guidance1
Step 1: Understand the term 'acellular infectious agent' — this refers to an infectious entity that is not made up of cells, unlike bacteria, fungi, or protozoa which are cellular organisms.
Step 2: Recall that viruses are acellular because they lack cellular structures such as a nucleus, cytoplasm, and organelles; they consist mainly of genetic material (DNA or RNA) enclosed in a protein coat.
Step 3: Recognize that fungi, protozoa, and bacteria are all cellular organisms, meaning they have cells with nuclei (in the case of fungi and protozoa) or nucleoid regions (in bacteria), so they are not acellular.
Step 4: Compare the options: since the question asks for an acellular infectious agent lacking a nucleus, the virus fits this description perfectly.
Step 5: Conclude that the correct answer is 'Virus' because it is the only acellular infectious agent among the options provided.
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