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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 12SQ
Textbook Problem
84 views

A stromatolite is a structure __________ .

  1. a. produced by endosymbiosis
  2. b. that forms when a meteorite hits the Earth
  3. c. consisting of layered bacteria and sediment
  4. d. that expels hot water from deep in the Earth

Summary Introduction

Concept introduction: The evidence of the early cellular life comes from the fossil stromatolites. It is a rocky-layered structure, and the photosynthetic bacteria that live on the upper layer of stromatolite will grow as a mat and trap more sediment. The stromatolite in ancient times contained both bacteria and archaea. The oldest stromatolite dated to be 2.8 billion years ago.

Explanation of Solution

Reasons for correct statement:

The stromatolite formed in the shallow sunlit water is a rocky-layered structure. And it has formed when the mat of prokaryotic cells trap minerals and sediments. Sediments cover the cells atop the stromatolite and new cells grow over that sediment and it traps more sediment to form a new layer.

Option c. is given as “consisting of layered bacteria and sediments”.

 As the stromatolite consists of layered bacteria and sediments, option c. is correct.

Reasons for the incorrect statements:

Option a. is given as “produced by endosymbiois”.

Endosymbiotic theory is an evolutionary theory that states that the eukaryotic organisms have originated from the prokaryotic cells. Endosymbiosis is a relationship in which one organism will live inside the other...

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