In cases of malaria, the primary exoerythrocytic cycle occurs in the:
a. blood.
b. lung.
c. liver.
d. lymph nodes.
C
The vector for malaria is the female anopheline mosquito. When the vector takes a blood meal, sporozoites contained in the salivary glands of the mosquito are discharged into the puncture wound. Within an hour, these infective sporozoites are carried via the blood to the liver, where they penetrate hepatocytes and begin to grow, initiating the preerythrocytic or pri-mary exoerythrocytic cycle.
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Comparison of proteins from normal muscle cells and cells derived from a fibrosarcoma is performed using two-dimensional gel analysis
The gel with normal muscle cells shows one large protein, FS, which disappears from the gel with the fibrosarcoma cell lysates. Two smaller proteins (P1 and P2) have appeared in the fibrosarcoma cells. Mass spectrophotometry of FS, P1, and P2 indicates that the new smaller proteins have sequences that match the protein FS; if combined, their sizes would be equivalent to protein FS. With these results, which of the following could be a reasonable conclusion? A. Protein FS been covalently modified by phosphorylation in fibrosarcoma cells. B. P1 and P2 cause fibrosarcoma. C. Intact FS insures normal cell function. D. Cleavage of FS to P1 and P2 may be associated with fibrosarcoma. E. There is a mutated form of FS in fibrosarcoma patients.
Muscle that is not striated and is involuntary is ____
a. cardiac only b. skeletal only c. smooth only d. both cardiac and skeletal e. both cardiac and smooth
Which of the following statements concerning
fertilization in ferns is true? a. It occurs outside the egg-producing structure. b. It requires water. c. The fertilization product is haploid. d. A spore is the product of fertilization. e. None of these are true.
What term denotes the range of all factors that influence whether a species can obtain resources
essential for survival and reproduction? a. habitat b. niche c. carrying capacity d. ecosystem e. community