Virus size is
a. 300 to 400 ?m.
b. 10 to 400 mm.
c. 10 to 200 cm.
d. 10 to 400 nm.
e. 300 to 400 mm.
D
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Humans contract Chagas disease when the reduviid bug defecates while taking a blood meal and the parasites in the feces are rubbed or scratched into the bite wound or onto mucosal surfaces. Which stage in the blood infects the host cells?
a. Amastigote b. Epimastigote c. Trypomastigote d. Promastigote
Which of the following events involves the release of enzymes?
A. cell cleavage B. cortical reaction C. egg membrane depolarization D. increase in cytosolic calcium within the egg E. the fusion of egg and sperm nuclei
A horseshoe crab uses its long extended spine for what purpose?
a. defending its territory b. digging for clams c. fighting for mates d. protection from predators e. flipping itself right side up
You notice in the fall that the oak trees on campus change color at slightly different times, even though the environment is the same for all the trees. What is the most likely explanation?
A) Natural selection is causing some trees to change. B) There are different alleles of the gene responsible for color change. C) The weather changes the genes of the oak trees each year. D) All the trees have the same genes, but each tree makes different proteins from the genes.