What do the banded formations in marine sediments indicate? a. Early cyanobacteria probably were producing oxygen when the sediment was deposited. b. The pH value of the early seas was quite low due to the excretion of organic acids from the fermentation by prokaryotes. c. Purple sulfur bacteria were the dominant life form in the seas during that time. d. The early atmosphere was very reducing.
What do the banded formations in marine sediments indicate? a. Early cyanobacteria probably were producing oxygen when the sediment was deposited. b. The pH value of the early seas was quite low due to the excretion of organic acids from the fermentation by prokaryotes. c. Purple sulfur bacteria were the dominant life form in the seas during that time. d. The early atmosphere was very reducing.
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter30: Fungi
Section: Chapter Questions
Problem 15TYK
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Question
1. Why does the endosymbiotic hypothesis need to maintain that chloroplasts may have had at least three different origins? It is because
a. the phyla of algal protists can be divided into three groups based on photosynthetic pigments and chloroplast structure
b. molecular systematics link the red line, green line, and brown line to three different eubacteria
c. the pigment compositions and thylakoid arrangement of cyanobacteria occur in three different arrangements
d. the chloroplasts of green plants show three distinct morphologies
2. What do the banded formations in marine sediments indicate?
a. Early cyanobacteria probably were producing oxygen when the sediment was deposited.
b. The pH value of the early seas was quite low due to the excretion of organic acids from the fermentation by prokaryotes.
c. Purple sulfur bacteria were the dominant life form in the seas during that time.
d. The early atmosphere was very reducing.
3. How did the first gene develop?
a. DNA molecules produced RNA molecules
b. Zinc or other metals catalyzed the formation of polypeptides.
c. Protobionts grew and divided.
d. Short RNA strands self-replicated.
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