Brittle stars can regrow a new arm if an existing one is broken off. This is an example of
A) hermaphrodism.
B) parthenogenesis.
C) regeneration.
D) budding.
E) sexual reproduction.
C
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The difference between benign and malignant tumors is that
A) benign tumors have not lost growth control. B) benign tumors do not stimulate angiogenesis. C) benign tumors have not spread to other sites. D) malignant tumors are adherent. E) benign tumors are cancers, while malignant tumors are not.
Which statements are true for chloroplasts?
a) They contain the green pigment chlorophyll. b) They are the sites of reactions that convert solar energy into chemical energy. c) Their inner membrane has infoldings called cristae. d) Their matrix contains enzymes that function in cellular respiration. e) They are the sites of reactions that convert chemical energy to ATP. f) They have membranous sacs called thylakoids that are surrounded by a fluid called stroma.
Lipids differ from other large biological molecules in that they _____.
A. are much larger B. are not truly polymers C. do not have specific shapes D. do not contain carbon E. do not contain nitrogen and phosphorus atoms
Radiation therapy for cancer works because a cell's DNA is exposed during mitosis and is most vulnerable to damage from radiation. Because cancer cells are uncontrollably undergoing mitosis, they die when exposed to the treatment. The common side effects of radiation treatment are hair loss and vomiting. What does this imply?
A) Radiation treatment will be ineffective in treating stomach cancer. B) Radiation treatment will be most effective for the treatment of skin and stomach cancers. C) Both skin and stomach cancer will be made worse if treated with radiation. D) Both stomach and skin cells are constantly being replaced. E) Radiation therapy is an ineffective way to treat cancer.