Humans become infected with the malarial parasite when mosquitoes inject ________ into the bloodstream.
A. sporozoites
B. schizonts
C. merozoites
D. trophozoites
Answer: A
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The vegetative body of a fungus is called a ______.
a. thallus b. mycelium c. hypha d. septum
Which of the following statements concerning cancer
cells is most accurate? a. Proto-oncogenes are part of the regulatory section of a chromosome. b. Tumor cells have lost their ability to stop dividing. c. Proto-oncogenes help control runaway cell division. d. Benign tumor cells usually spread only to adjacent organs. e. Metastasis is the spread of benign cells.
Traits that are controlled by genes located on the X chromosome are said to be ________.
A. gametal B. sex-linked C. autosomal D. pleiotropic