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Chapter 1, Problem 1SQ

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Campbell Essential Biology (6th Ed...

6th Edition
Eric J. Simon + 3 others
ISBN: 9780133917789

Solutions

Chapter
Section
BuyFindarrow_forward

Campbell Essential Biology (6th Ed...

6th Edition
Eric J. Simon + 3 others
ISBN: 9780133917789
Summary Introduction

Concept introduction:

Living organisms includes microbes, fungi, protists, plants, animals, and humans. Living organisms have the ability to response to stimuli and reproduce their young ones. They are capable of growth and development. They are able to maintain homeostasis.

Answer

Correct answer:

Not all living organisms are composed of multiple cells. Therefore, option b. is correct.

Explanation

Reason for the correct statement

In living organisms, some are prokaryotic and some are eukaryotic. Some living organisms are made up of single cell and are called unicellular, whereas some are made up of many cells that perform definite function and are called multicellular organisms. Unicellular organisms such as bacteria, protists, and yeast are made of single cell.

Option b. is given as “composed of multiple cells”.

As, “some living organisms are composed of single cell and called unicellular organisms”, is the right answer.

Hence, option b. is correct.

Reasons for the incorrect statements:

Option (a) is given as “capable of self-reproduction”.

Self-reproduction is done by prokaryotic and unicellular organisms, as it producing their offspring by asexual reproduction. So it is a wrong answer.

Option (c) is given as “complex yet organized”.

Living organisms are complex and organized but some have simple structures and are not organized. So, it is a wrong answer.

Option (d) is given as “uses energy”.

All living organisms use energy in the form of ATP from breakdown of sugar. So, it is a wrong answer.

Hence, options (a), (c), and (d), are incorrect.

Conclusion

Conclusion:

All living organisms are not composed of multiple cells. Some organisms are unicellular as they have single cell, which is responsible for performing all the functions in body.

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