Chapter 1 HW q's
which type(s) of microorganisms have cells that lack membrane-bound organelles?
archaea and bacteria
eukaryotic organisms can be
multi-celled or single-celled
organisms that populate the human body and which protect it from disease are termed
normal flora
in general, disease-causing organisms are referred to as what?
pathogens
compared to the diversity of plants and animals, microbes as a group are
more diverse
although archaea and bacteria differ in a number of important characteristics, it was ultimately significant differences in their ___ that provided the basis for separating the two groups of prokaryotes into different domains
ribosomal RNA sequences
characteristics of archaea that are similar to bacteria include all of the following except their
ribosomal RNA sequences
T or F: We cannot survive without microorganisms
True
which organisms lack a membrane-nucleus?
bacteria and archaea
___ is the domain of organisms who's cells have a nucleus and various organelles
eukarya
fungi, algae, protozoa, and helminths are all what?
eukaryotes
staphylococcus aureus staphylococcus epidermidis are in the same
genus
a testable explanation for an observation is called a(n)
hypothesis
prions are
infectious proteins
Louis Pasteur helped disprove
the theory of spontaneous generation
T or F: Without microorganisms we would run out of certain nutrients
true
Unlike the term microorganism, the word microbe also includes
viruses
algae are
-multicellular, photosynthetic eukaryotes -single-celled, photosynthetic eukaryotes
which of the following cannot reproduce independently?
-prions -viroids
what best describes bacteria?
-shapes include rods, spherical, and spiral -some obtain energy from sources not used by animals or plants -they multiply by binary fission -some obtain energy from foods similar to what humans eat -some obtain energy from sunlight
which of the following is/are true regarding viruses?
-viruses can only multiply within host cells -outside of host cells, viruses are inactive
