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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

Solutions

Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 19, Problem 5SQ
Textbook Problem
358 views

The prevalence of _______ in living organisms is taken as support for the idea that life arose near deep-sea vents.

  1. a. mitochondria
  2. b. iron–sulfide cofactors
  3. c. DNA
  4. d. a plasma membrane

Summary Introduction

Concept introduction: The iron–sulfur world hypothesis, which was proposed by Gunter Wachtershauser, states that life has originated at deep-sea hydrothermal vents. The iron sulfide compounds have the ability to speed up the reactions that combine inorganic molecules together into the organic ones.

Explanation of Solution

Reasons for correct statement:

Around the hydrothermal vents, porous rocks will be formed that are rich in iron sulfides. These iron sulfide compounds can easily donate electron to the inorganic gases dissolved in the hot sea water spewing from the vents. By accepting these electrons, organic molecules such as pyruvate can be formed. These organic molecules would have adhered to iron–sulfur compounds and accumulated inside tiny, cell-sized chambers of the rocks.

Option b. is given as “iron-sulfide cofactors”.

As the iron sulfide cofactors occurrence in living organisms are taken as the support for the idea that life arose near deep sea vents, option b. is correct.

Reasons for the incorrect statements:

Option a. is given as “mitochondria”.

The evolution of the mitochondria by the endosymbiois began when the bacteria capable of the aerobic respiration entered the archeal cell or early eukaryote...

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