CONNECT WITH LEARNSMART FOR COWAN: MICR
CONNECT WITH LEARNSMART FOR COWAN: MICR
3rd Edition
ISBN: 2818440123740
Author: Cowan
Publisher: MCG
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Chapter 1, Problem 1Q
Summary Introduction

Introduction:

The acellular organism is defined as the organism that is not made up of the cells, but still has nucleic acid, and has the ability to replicate within the host cell genome. As acellular organisms do not have a cell so they are not considered as an organism. So, it is better to call them a particle rather than an organism.

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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.

Conclusion

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

CONNECT WITH LEARNSMART FOR COWAN: MICR

Ch. 1.2 - Make a time line of the development of...Ch. 1.2 - List some recent microbiology discoveries of great...Ch. 1.2 - Identify the important features of the scientific...Ch. 1.3 - Name the four main families of biochemicals.Ch. 1.3 - Provide examples of cell components made from each...Ch. 1.3 - Differentiate among primary, secondary, tertiary,...Ch. 1.3 - List the three components of a nucleotide.Ch. 1.3 - Name the three nitrogen bases of DNA and RNA.Ch. 1.3 - Prob. 17AYPCh. 1.3 - Recall three characteristics common to all cells.Ch. 1.3 - Q. Use context in the paragraph above to deduce...Ch. 1.3 - Prob. 2NPCh. 1.4 - Differentiate among the terms nomenclature,...Ch. 1.4 - Create a mnemonic device for remembering the...Ch. 1.4 - Correctly write the binomial name for a...Ch. 1.4 - Draw a diagram of the three major domains.Ch. 1.4 - Explain the difference between traditional and...Ch. 1 - Prob. 1QCh. 1 - Name six types of microorganisms that we are...Ch. 1 - Defend the argument that a web of life is a more...Ch. 1 - Which of the following is a macromolecule that...Ch. 1 - Prob. 5QCh. 1 - Imagine a way you might design a drug to destroy...Ch. 1 - Prob. 7QCh. 1 - Provide an argument about why metabolic...Ch. 1 - Provide a possible interpretation of the finding...Ch. 1 - DNA leads to RNA which can lead to the creation of...Ch. 1 - Compare and contrast the RNA molecule with the DNA...Ch. 1 - Suggest an argument for why eukaryotic cells have...Ch. 1 - Prob. 13QCh. 1 - Defend or refute this statement: Microbes intend...Ch. 1 - Coevolution is a term describing the influence...Ch. 1 - Which of the following processes can be the result...Ch. 1 - Speculate about why scientists believe there are...Ch. 1 - Prob. 18QCh. 1 - When a hypothesis has been thoroughly supported by...Ch. 1 - Defend the use of complicated-sounding names for...Ch. 1 - Identify the most important component of the...Ch. 1 - Figure 1.2 Look at the red bat (the time that...
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