What attaches mosses to their substrate?
a. gametophytes
b. antheridium
c. rhizoids
d. operculum
c. rhizoids
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An attenuated strain of a pathogen
A) has lost its virulence, but may be used to create a vaccine. B) has changed its antigens to avoid an adaptive immune response. C) is more virulent than the regular strains and may cause septic shock. D) is an extracellular pathogen that will be cleared by innate immunity.
The branch of science that deals with the naming and grouping of organisms is known as
A) histology. B) molecular biology. C) chemistry. D) taxonomy. E) ecology.
The DNA double helix is held together by (covalent/ionic/hydrogen) bonds
What will be an ideal response?
Which microscope bombards a whole, metal-coated specimen with electrons moving back and forth over it?
A. scanning electron B. differential interference contrast C. fluorescence D. phase-contrast E. transmission electron