Which protozoan group consists solely of parasitic forms?
A) apicomplexans
B) ciliates
C) flagellates
D) amoebas
A
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Tracts (bundles of sheathed axons)
a. are found in the gray matter of the spinal cord. b. are found in the white matter of the spinal cord. c. are covered with myelin sheaths. d. contain fibers of sensory neurons and of interneurons. e. include all of these EXCEPT “found in the gray matter of the spinal cord.”
A tunicate is a(n)
A) jawless fish. B) cartilaginous fish. C) invertebrate chordate. D) bony fish. E) amphibian.
Which of the following statements accurately describes why Taq polymerase is used in PCR?
A. It has regions that are complementary to the primers. B. It is heat stable and can withstand the heating step of PCR. C. It binds more readily than other polymerases to the primers. D. Only minute amounts are needed for each cycle of PCR.
Growth of new blood vessels is stimulated by vascular endothelial growth factor (VEGF). This ligand binds to the VEGF receptor, which leads to the dimerization and autophosphorylation of this receptor on cytoplasmic tyrosines. What type of receptor is the VEGF receptor?
A. Enzymatic receptor B. G protein-coupled receptor C. Steroid hormone receptor D. Channel-linked receptor