The feature that most clearly separates eukaryotes from prokaryotes is the presence of _______ in eukaryotic cells.
a. ribosomes
b. oxidative phosphorylation
c. DNA molecules
d. a nucleus
Ans: d. a nucleus
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An antiseptic (or germicide) is distinguished from other sterilizing compounds by
A) being able to inhibit growth of microorganisms but not necessarily kill all of them. B) being able to be used on living tissues without harm. C) its ability to protect from subsequent microbial infectionsâ€"not just initial sterilization. D) killing all bacteria and microscopic fungi but not being effective against viruses.
Effluent water is wastewater
A) discharged from the pharmaceutical, plastics, and petrochemical industries. B) discharged from the wastewater treatment facility. C) that has undergone anoxic secondary wastewater treatment. D) that is imported to the wastewater treatment facility for treatment.
The science of describing, naming, and classifying extant and extinct organisms is
A. evolution. B. phylogeny. C. taxonomy. D. nomenclature. E. biology.
What are the two active sites or "domains" on a repressor protein?
What will be an ideal response?