Chemotherapy often produces hair loss and nausea. What aspect of the treatment impacts these normal nontarget tissues?
a. The cells that form the hair follicle and line the digestive system have receptors similar to those found on tumor cells and bind the chemotheraputic agents just as the tumor cells do.
b. All body cells take up the chemotherapeutic drugs but the cells that need to go through the cell cycle repeatedly, like hair cells and tumor cells, are inhibited from doing so.
c. Cells that are damaged by chemotherapy are nonmutated versions of the tumor cells; both the normal and tumor cells retain their sensitivities to the chemotherapy and are equally affected.
d. Oncologists have no satisfactory explanation for the observation, but are working aggressively to minimize these and other unintended effects.
Ans: b. All body cells take up the chemotherapeutic drugs but the cells that need to go through the cell cycle repeatedly, like hair cells and tumor cells, are inhibited from doing so.
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Which statement best describes the relationship between a carpel and a pistil?
A. The two terms are merely two names for the same thing. B. A pistil is part of a male component of the flower whereas a carpel is part of a female component. C. A pistil can be composed of either a single carpel (in which case the two terms are synonymous) or of two or more carpels fused together. D. A pistil is a reproductive part of a flower whereas a carpel is a showy vegetative part. E. A pistil is part of the female component of a flower and a carpel is not even a flower part at all.
Order the following regions of a gene from the most upstream region (1) to the most downstream region (5).1. -35 consensus sequence2. Pribnow box3. coding sequence4. rut site5. terminator
Fill in the blank(s) with the appropriate word(s).
Some flatworms feed on termites, but are not always successful. Which of the following procedures do they use to solve this problem?
a. They position themselves to chemically attract termites and use their head with mucus and suction to capture termites. b. They position themselves to visually attract termites and use their head with mucus and suction to capture termites. c. They position themselves to visually attract termites and use their whole body with mucus and suction to capture termites. d. They position themselves to chemically attract termites and use their whole body with mucus and suction to capture termites.
In an open circulatory system, the fluid pumped is called ____.
A. hemoglobin B. lymphatic fluid C. hemolymph D. blood E. capillary fluid