The first group of plants with flowers were:

a. algae
b. fern allies
c. ferns
d. angiosperms
e. gymnosperms


d

Biology & Microbiology

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Notochords are found in

a. adult hemichordates (acorn worms). b. adult urochordates (tunicates). c. adult cephalochordates (lancelets). d. a and b only. e. b and c only.

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Which organ requires oxygen levels high enough to maintain aerobic respiration

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Biology & Microbiology

Marine cone snails, Conus magus, are the source of ________

A) calcitonin used to treat osteoporosis B) growth hormone used to treat dwarfism C) hydroxyapatite used to treat arthritis D) cells for the LAL test used to detect bacterial contamination of surgical tools E) Prialt, a peptide used as a pain reliever

Biology & Microbiology

A major change in the surface glycoproteins of influenza A, which occurs every 10 years on average, is called (antigenic/genetic/protein) shift

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Biology & Microbiology