Which of the following statements about the similarities and difference between chemotherapy and radiation therapy as cancer treatments is INCORRECT?
a) In radiation therapy, the nearby tissue may be harmed, while in chemotherapy, the rate at which healthy cells divide may be reduced.
b) Both chemotherapy and radiation therapy work by disrupting cell division.
c) Both chemotherapy and radiation therapy have side-effects.
d) The drugs used in chemotherapy circulate throughout the entire body, while radiation therapy directs high energy radiation only at the part of the body where the tumor is located.
e) Radiation therapy has a significantly higher success rate than does chemotherapy.
Ans: e) Radiation therapy has a significantly higher success rate than does chemotherapy.
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Sharks live in seawater. Their tissues are isotonic to seawater, but their concentrations of sodium ions, potassium ions, and chloride ions in cells and extracellular fluids are similar to those of freshwater fishes. How is that possible?
A) Urea and trimethylamine oxide contribute to intra- and extracellular osmolarity in shark tissues. B) Metabolic intermediates of sharks tie up intracellular chloride and potassium ions. C) Their blood is hypotonic to their tissues. D) They excrete large quantities of electrolytes.
The ____ of a bird's digestive system contains sand and rocks to aid in mechanical digestion
a. crop b. esophagus c. gizzard d. intestine e. mouth
Nephrons are found in ____
a. annelids b. mammals c. flatworms d. insects e. adult mollusks
Approximately how many neurons are in the human brain?
a. 1,000 b. 10,000 c. 100,000 d. 100,000,000 e. 100,000,000,000