Which of the following best describes what the term 'ubiquitous' means in reference to microorganisms?
A) They are everywhere in the environment.
B) They are commonly found in the soil.
C) They are in the air only.
D) They are on all surfaces, but not in the air.
A) They are everywhere in the environment.
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Adding nucleotides onto a growing DNA strand during DNA replication in cells occurs in ____
a. the 5' ® 3' direction for the leading strand and the 3' ® 5' direction on the lagging strand b. either the 5' ® 3' direction or the 3' ® 5' direction on both strands, depending on where replication begins c. the 5' ® 3' direction only d. the 3' ® 5' direction for the leading strand and the 5' ® 3' direction on the lagging strand
e. the 3' ® 5' direction onlyA CD4+ T cell binds to an antigen only if this antigenis ____
a. in a complex with a class I MHC protein b. in a complex with a class II MHC protein c. in a complex with a class III MHC protein d. not in a complex with MHC proteins e. presented on the surface of a B cell
Darwin recognized that female preference for showy colors based on inheritance causes these male traits to become
more common over time. ________ Indicate whether the statement is true or false.
The process that produces mRNA from DNA is called
A. translation. B. replication. C. post-translational modification. D. transcription. E. processing.