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. steroid hormone receptor
C. channel-linked receptor
D. G protein-coupled receptor
Answer: A
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A sterile item is free of
A. microbes. B. endospores. C. viruses. D. prions. E. microbes, endospores, AND viruses.
What cell type would have a high concentration of metabolic enzymes?
A. nerve cell B. mammary cell C. lung cell D. liver cell E. cartilage cell
Imagine that a section of heart muscle no longer has gap junctions. What do you think would be the result?
A. The effects would be minimal from this change. B. The ability of the heart muscle cells to contract would be severely compromised. C. The ability of the heart muscle cells to reproduce would be severely compromised. D. The ability of the heart muscle cells to coordinate their contractions would be severely compromised.
Worldwide, ____ are often used as pollution-monitoring devices
a. fungal infections b. mycorrhizae c. lichens d. yeast e. mushrooms