11 Questions
What is the main characteristic that distinguishes bacteria as prokaryotic organisms?
Genetic material (DNA) not housed within a true nucleus
Which of the following is NOT a common bacterial shape described in the text?
Triangular (trichillus)
What substance is commonly found in archaeal cell walls instead of peptidoglycan?
Pseudopeptidoglycan
In what environments can archaea be found according to the text?
In nearly every habitat on earth, including extreme environments
What type of bacteria use energy derived from sunlight and fix carbon dioxide for growth?
Oxygenic cyanobacteria and green sulfur bacteria
Most bacteria are harmless or helpful, but some are ______, causing disease in humans and other animals.
pathogens
Figure 1.13 shows examples of common bacterial shapes. Note how coccobacillus is a combination of spherical (coccus) and rod-shaped ______.
bacillus
Archaea and bacteria have the same evolutionary histories.
False
All archaea are human pathogens.
False
Photosynthetic bacteria use energy derived from organic compounds in their environment.
False
Bacteria are eukaryotic because their genetic material is housed within a true nucleus.
False
Explore the world of microorganisms, from unicellular microbes that are visible to the naked eye to multicellular organisms that are microscopic. Discover the size range of different organisms, from those that can be seen without a microscope to those that are significantly smaller.
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