Each of the following statements is true for Toxoplasma gondii except that
A. it can cause stillbirth.
B. infection often fatal for AIDS patients.
C. it is a flagellated parasite.
D. it has a narrow host range.
Answer: D
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Which of the following is a type of roots?
A. buttress B. pneumatophores C. prop D. lateral E. All of the choices are correct
Which of the following is not a function of the Fc portion of the immunoglobulin molecule?
A. Binding to the antigen B. Binding to a component of the complement system C. Binding to host cells including some cells of the immune system and some phagocytic cells D. All of the choices are functions of the Fc end of an immunoglobulin molecule.
In a fruit fly embryo, a homeotic gene Antp determines where legs grow. When the promoter of Antp is mutated, a fly ends up with legs growing out of its head in place of antennae. In this mutation
A. antennae grow where the legs would normally be found. B. Antp must be turned off in all of the fly cells. C. Antp must be turned on in the head. D. the Antp gene, and its transcription factor, and enhancer sequence are turned on in the head. E. the Antp enhancer sequence, or transcription factor, is not functional.
During phase "1" in the figure above, the size of the deer population grows slowly because ____
a. predators eat fawns as they are born b. the number of breeding individuals is small c. the temperatures are relatively extreme d. the amount of food available is relatively scarce e. fawns are subject to disease