Chapter 1 HW q's

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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


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