Concept explainers
Introduction:
The acellular organism is defined as the organism that is not made up of the cells, but still has
Answer to Problem 1Q
Correct answer:
Viruses are the acellular microorganisms lacking a nucleus. Therefore, option (d) is correct.
Option (d) is given as “virus”.
Explanation of Solution
Justify the reasons for the correct statement:
Viruses are the acellular entities that are considered as ultramicroscopic infectious particles, viruses are known to infect all the life forms present or earth, from microbes to plants and animals. Viruses have either DNA or RNA as their genetic materials yet they lack cell organelles. Hence, they are named as acellular organisms.
Hence, option (d) is correct.
Justify the reasons for the incorrect statements:
Option (a) is given as “bacterium”.
Bacteria have a nucleoid region instead of a true nucleus, but they are unicellular organisms means they have a single cell. Hence, it is a wrong answer.
Option (b) is given as “helminth”.
The helminths are the multicellular organisms. And each cell has a well-known nucleus. Hence, it is a wrong answer.
Option (c) is given as “protozoan”.
Protozoa belong to domain eukaryotes but are the unicellular microorganisms. So, they contain a nucleus. Hence, it is a wrong answer.
Hence, options (a),(b), and(c) are incorrect.
Hence, viruses are lacking a nucleus, because they do not have cells organelles. Yet,the virushas a nucleic acid, either DNA or RNA.
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Chapter 1 Solutions
MICROBIOLOGY FUND.:CLINICAL APPR-ACCESS
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- Select a statement that is not correct about bacterial fimbriae? A. they protect the cell from dehydration B. they are called attachment pili to distinguish them from the pili used to transfer DNA during conjugation C. they are used to attach the cell to its substrate or to other prokaryote D. they are hair-like projections that aid in attachment.arrow_forwardBacteria are similar to archaea in that theya. arose through endosymbiosis.b. are multicellular.c. live in extreme environments.d. are prokaryotes.arrow_forwardChoose the combination of answers that most accurately completes the statement.Viruses are not considered living things because a. they are not cells b. they cannot reproduce by themselves c. they lack metabolism d. All of these are correctarrow_forward
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