1- Approximately two billion years ago, ________ were primarily responsible for

ID: 194542 • Letter: 1

Question

Approximately two billion years ago, ________ were primarily responsible for initially oxygenating Earth.
a. algae
b. Archaea

c. cyanobacteria
d. purple sulfur bacteria

Archaea and Bacteria are unified as prokaryotes in lacking ________ which Eukarya contain, such as golgi.
a. membranes
b. nuclei

c. membrane-enclosed organelles
d. nuclei and membrane-enclosed organelles

An ecosystem includes ________ along with ________.
a. macroorganisms / microorganisms
b. living organisms / their chemical and physical environments

c. pathogenic organisms / non-pathogenic organisms
d. single celled organisms / multi-cellular organisms

4- The disease anthrax is caused by the pathogenic bacterium ________, which produces heat-resistant structures known as ________.

a. Azotobacter chroococcum / endospores

b. Azotobacter chroococcum / plasmids

c. Bacillus anthracis / endospores
d. Bacillus anthracis / plasmids

5- ________ was the first to describe microorganisms, while ________ was the first person to see bacteria.

a. Antoni van Leeuwenhoek / Robert Hook
b. Antoni van Leeuwenhoek / Robert Koch

c. Robert Hooke / Antoni van Leeuwenhoek

d. Robert Koch / Antoni van Leeuwenhoek

1. c. cyanobacteria

2.c.membrane bound organelles

3.b. living organisms / their chemical and physical environments

4.c. Bacillus anthracis /endospores

5.c Robert Hooke /Antoni van Leeuwenhoek

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