Secondary xylem is formed in association with the
a. pith.
b. inner face of vascular cambium.
c. outer face of vascular cambium.
d. inner face of cork cambium.
e. outer face of cork cambium.
Answer: b
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Which of the following statements accurately describes the role of insects in early angiosperm evolution?
A. Insect pollination may have allowed early angiosperms to thrive in the understory habitats of tropical rain forests. B. Insect pollination may have allowed early angiosperms to thrive in the canopy of tropical rain forests. C. Mammal pollination may have contributed to early angiosperm success. D. Very few living members of the earliest angiosperm lineages produce flowers that are visited by insects. E. Insects did not play a significant role in early angiosperm evolution.
The central nervous system (CNS) may become infected through the
A. bloodstream. B. nerves. C. extensions from bone. D. ventricles. E. bloodstream, nerves AND extensions from bone.
Flagella occur in both prokaryotes and eukaryotes. Which of the following statements DOES NOT describe how the flagella of prokaryotes and eukaryotes differ?
A. Eukaryotic flagella have microtubules in a cytoskeleton whereas prokaryotic ones do not. B. Eukaryotic flagella have the motor protein dynein whereas the prokaryotic one does not. C. The eukaryotic flagellum is covered by the plasma membrane whereas that of the prokaryotes is not. D. Prokaryotic flagella have a basal apparatus and hook that rotates the filament whereas eukaryotic flagella do not. E. The filament of eukaryotes is multilayered whereas that of prokaryotes is a single strand.
The structural combination of DNA and protein forms ________
A) nucleoli B) RNA C) chromatin D) ribosomes