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1.1 The study of life Read Online
Viewed from space, Earth offers no clues about the diversity of life forms that reside there. The first forms of life on Earth are thought to have been microorganisms that existed for billions of years in the ocean before plants and animals appeared. The mammals, birds, and flowers so familiar to us are all relatively recent, originating 130 to 200 million years ago. Humans have inhabited this planet for only the last 2.5 million years, and only in the last 200,000 years have humans started looking like we do today.
Chapter 22: Prokaryotes: Bacteria and Archaea MCQ Multiple Choices Questions Quiz Test Bank
22.1 Prokaryotic Diversity
22.2 Structure of Prokaryotes
22.3 Prokaryotic Metabolism
22.4 Bacterial Diseases in Humans
22.5 Beneficial Prokaryotes
Question: The first forms of life on Earth were thought to be_________.
Choices:
single-celled plants
prokaryotes
insects
large animals such as dinosaurs
Question: The lipopolysaccharide layer (LPS) is a characteristic of the wall of ________.
Choices:
archaean cells
Gram-negative bacteria
bacterial prokaryotic cells
eukaryotic cells
Question: Halophiles are organisms that require________.
Choices:
a salt concentration of at least 0.2 M
high sugar concentration
the addition of halogens
all of the above
Question: Prokaryotes stain as Gram-positive or Gramnegative because of differences in the cell _______.
Choices:
wall
cytoplasm
nucleus
chromosome
Question: Microbial mats __________.
Choices:
are the earliest forms of life on Earth
obtained their energy and food from hydrothermal vents
are multi-layered sheet of prokaryotes including mostly bacteria but also archaea
all of the above
Question: Pseudopeptidoglycan is a characteristic of the walls of ________.
Choices:
eukaryotic cells
bacterial prokaryotic cells
archaean prokaryotic cells
bacterial and archaean prokaryotic cells
Question: Which of the following consist of prokaryotic cells?
Choices:
bacteria and fungi
archaea and fungi
protists and animals
bacteria and archaea
Question: The first organisms that oxygenated the atmosphere were
Choices:
cyanobacteria
phototrophic organisms
anaerobic organisms
all of the above
Question: Organisms most likely to be found in extreme environments are ________.
Choices:
fungi
bacteria
viruses
archaea
Question: The cell wall is ________.
Choices:
interior to the cell membrane
exterior to the cell membrane
a part of the cell membrane
interior or exterior, depending on the particular cell
Question: The presence of a membrane-enclosed nucleus is a characteristic of ________.
Choices:
prokaryotic cells
eukaryotic cells
all cells
viruses