Biological Science, Loose-leaf Edition (7th Edition)
Biological Science, Loose-leaf Edition (7th Edition)
7th Edition
ISBN: 9780135272800
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
bartleby

Concept explainers

bartleby

Videos

Textbook Question
Book Icon
Chapter 26, Problem 1TYK

What do some photosynthetic bacteria use as a source of electrons instead of water?

a. oxygen (O2)

b. hydrogen sulfide (H2S)

c. organic compounds (e.g., CH3COO)

d. nitrate (NO3)

Expert Solution & Answer
Check Mark
Summary Introduction

Introduction:

In the photophosphorylation reaction, electrons are required. These electrons are acquired from water molecules. The molecule is split and oxygen is generated as a by-product.

Answer to Problem 1TYK

Correct answer:

Some of the photosynthetic bacteria use hydrogen sulfide (H2S) instead of water as a source of electrons.

Explanation of Solution

Explanation/Justification for the correct answer:

Option (b) is given that hydrogen sulfide is used an alternative source of energy by some photosynthetic bacteria instead of water. Some of the bacteria may not use water molecule as a source of electrons and use hydrogen sulfide instead. For example, a sulfur bacteria Thiobacillus oxidizes sulfur by sulfate production required for growth of plants. Some of them also use other different molecules such as iron ions. Hence, Option (b) is correct.

Explanation for incorrect answers:

Option (a) is given that oxygen (O2) is used an alternative source of energy by some photosynthetic bacteria instead of water. In this process, oxygen is released as a by-product and does not act as an electron source. So, it is a wrong answer.

Option (c) is given that organic compounds like acetate are used as an alternative source of energy by some photosynthetic bacteria instead of water. The organic compounds such as acetate ions also do not provide electrons. So, it is a wrong answer.

Option (d) is given that nitrate (NO3-) is used an alternative source of energy by some photosynthetic bacteria, instead of water. The ammonia is converted into nitrate and is used up by the plants directly. Therefore, they do not provide electrons. So, it is a wrong answer.

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

Conclusion

Thus, some photosynthetic bacteria use hydrogen sulfide as an alternative source of energy.

Want to see more full solutions like this?

Subscribe now to access step-by-step solutions to millions of textbook problems written by subject matter experts!
Students have asked these similar questions
4. This question focuses on entrainment. a. What is entrainment? b. What environmental cues are involved in entrainment, and which one is most influential? c. Why is entrainment necessary? d. Assuming that a flash of darkness is an effective zeitgeber, what impact on circadian rhythms would you expect to result from an event such as the 2024 solar eclipse (assume it was viewed from Carbondale IL, where totality occurred at about 2 pm)? Explain your reasoning. You may wish to consult this phase response diagram. Phase Shift (Hours) Delay Zone Advance Zone Dawn Mid-day Dusk Night Dawn Time of Light Stimulus e. Finally, give a real-world example of how knowledge of circadian rhythms and entrainment has implications for human health and wellbeing or conservation biology. This example could be from your reading or from things discussed in class.
Generate one question that requires a Punnet Squre to solve the question. Then show how you calculate the possibilities of genotype and phenotype
Briefly state the physical meaning of the electrocapillary equation (Lippman equation).
Knowledge Booster
Background pattern image
Biology
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.
Similar questions
SEE MORE QUESTIONS
Recommended textbooks for you
Text book image
Concepts of Biology
Biology
ISBN:9781938168116
Author:Samantha Fowler, Rebecca Roush, James Wise
Publisher:OpenStax College
Text book image
Biochemistry
Biochemistry
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Cengage Learning
Text book image
BIOLOGY:CONCEPTS+APPL.(LOOSELEAF)
Biology
ISBN:9781305967359
Author:STARR
Publisher:CENGAGE L
Text book image
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
Text book image
Biology: The Unity and Diversity of Life (MindTap...
Biology
ISBN:9781337408332
Author:Cecie Starr, Ralph Taggart, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Text book image
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
Photosynthesis & Respiration | Reactions | Chemistry | FuseSchool; Author: FuseSchool - Global Education;https://www.youtube.com/watch?v=3XIyweZg6Sw;License: Standard YouTube License, CC-BY