Each of the following is true regarding cancer cell metastasis to secondary sites except
A) cancer cells may multiply in regional lymph nodes if they enter via lymphatics.
B) many cells from the primary mass may enter circulation.
C) all cancer cells circulating in the bloodstream are identical.
D) few cancer cells survive in the bloodstream.
E) the population of cancer cells is heterogeneous.
Answer: C
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The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration. Phosphate import depends on a pH gradient across the membrane
â€"more acidic outside the cell than inside the cell. Phosphate transport is an example of _____. A) passive diffusion B) facilitated diffusion C) active transport D) osmosis E) cotransport
In plant leaves, what are the tiny pores that allow carbon dioxide to enter and oxygen to exit?
What will be an ideal response?
Which term best describes the structure that is necessary for facilitated diffusion?
a. a receptor protein b. a pore c. a signal protein d. a carrier protein
Endospores survive a variety of harsh conditions in part because of the presence of
A. mycolic acid. B. lipopolysaccharide. C. hopanoids. D. dipicolinic acid. E. glycoproteins.