Biological Science (6th Edition)
Biological Science (6th Edition)
6th Edition
ISBN: 9780321976499
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Emily Taylor, Greg Podgorski, Jeff Carmichael
Publisher: PEARSON
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Chapter 29, Problem 1TYK
Summary Introduction

Introduction:

The mycelia are the vegetative structure of the fungus. They consist of fine white filaments, which are referred as hyphae. The hyphae are the long narrow branching filament.

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Answer to Problem 1TYK

Correct answer:

The mycelial growth habit leads to a body with a high surface-area-to-volume ratio to have a large surface area for absorption.

Explanation of Solution

Explanation/justification for the correct answer:

Option (a) is given that the mycelial body has a high surface-area-to-volume ratio to have a large surface area for absorption. The fungi feed on the dead and the decaying organism. The long length of mycelia increases its surface area that helps them to easily absorb the food material (nutrients). Hence, Option (a) is correct.

Explanation for incorrect answer:

Option (b) is given that the mycelial body has a high surface-area-to-volume ratio, so that the hyphae that makeup mycelia are long, thin tubes. The large surface area of mycelia helps in absorption of nutrients. So, it is a wrong answer.

Option (c) is given that the mycelial body has a high surface-area-to-volume ratio, so that most hyphae are broken up into compartments by walls called septa, although some exist as single, gigantic cells. The distribution of mycelial body into fragments helps in asexual reproduction and has no relation to the large surface area of the mycelial body. So, it is a wrong answer.

Option (d) is given that mycelial body has a high surface-area-to-volume ratio so, that the hyphae can infiltrate living and dead tissues. The infiltration of living or dead tissue is done by the pores in the septa that separate the hyphae into compartments. So, it is a wrong answer.

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

Conclusion

The mycelial growth habit results in the development of high surface-area-to-volume ratio. The large surface area is important, so that the mycelia have increased area for the absorption of nutrients from the dead decaying food source.

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Imagine that you are a clinical geneticist. Your colleague is an oncologist who wants your help explaining the basics of genetics to their patient, who will be undergoing genetic testing in the coming weeks for possible acute myeloid leukemia (AML) induced by the radiation she had several years ago for breast cancer. Write a 1,050- to 1,225-word memo to your colleague. Include the following in your memo: An explanation of the molecular structure of DNA and RNA, highlighting both similarities and differences  A description of the processes of transcription and translation An explanation of the differences between leading and lagging strands and how the DNA is replicated in each strand Reponses to the following common questions patients might ask about this type of genetic testing and genetic disorder: Does AML run in families? What genes are tested for?
Respond to the following in a minimum of 175 words: What are some potential consequences that could result if the processes of replication, transcription, and translation don’t function correctly? Provide an example of how you might explain these consequences in terms that patients might understand.
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