Biology Now (Second Edition)
Biology Now (Second Edition)
2nd Edition
ISBN: 9780393631807
Author: Anne Houtman, Megan Scudellari, Cindy Malone
Publisher: W. W. Norton & Company
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Chapter 16, Problem 1TQ
Summary Introduction

The organisms containing a nucleus that is enclosed within a membrane are known as eukaryotes. Plants, animals, fungi, and algae are examples of eukaryotic organisms. The DNA of eukaryotes is bound by proteins termed as histones. Such organisms are classified under the domain Eukarya. The term ‘eukaryotes’ is derived from Greek, in which ‘eu’ means true and ‘karyon’ means nucleus.

Expert Solution & Answer
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Answer to Problem 1TQ

All the eukaryotic organisms are not multicellular. There are also free living, unicellular eukaryotic organisms.

Therefore, option a is correct. 

Explanation of Solution

Justify the reasons for the correct statement:

Most of the eukaryotic organisms are multicellular. Only a few eukaryotes are unicellular. For example, single cell-protists. Therefore, the description that states “they are multicellular” is not true of all eukaryotes.

Option (a) is given as, “They are multicellular”.

Hence, option (a) is correct.

Justify the reasons for the incorrect statements:

Option (b) is given as, “They have cellular organelles”. 

All the eukaryotic organisms contain membrane bound organelles like mitochondria and Golgi bodies. This description is true of all eukaryotes. Hence, it is a wrong answer.

Option (c) is given as, “They have a larger cell size than prokaryotes have”.   

The cell size of a eukaryotic organism is complex and larger than the prokaryotic cells.  This description is true of all eukaryotes. Hence, it is a wrong answer.

Option (d) is given as, “They have a true nucleus”.   

All the eukaryotic organisms contain a true nucleus. This description is true of all eukaryotes. Hence, it is a wrong answer.

Option (e) is given as, “All of the above are characteristics of all eukaryotes”.   

All the eukaryotes are not multicellular. Therefore, all of the given “options” are not the characteristics of eukaryotes. Hence, it is a wrong answer.

Hence, options (b), (c), (d), and (e) are incorrect.

Conclusion

The given description “the eukaryotes are multicellular” is not true of all eukaryotes.

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Prokaryotic vs. Eukaryotic Cells (Updated); Author: Amoeba Sisters;https://www.youtube.com/watch?v=Pxujitlv8wc;License: Standard youtube license