What is immunity?
a. an organism’s capacity to resist infection only
b. an organism’s capacity to both resist and combat infection
c. a pathogen
d. an organism’s capacity to combat infection only
e. a set of genetic instructions
ANSWER: b
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What is the correct sequence of steps during infection of plants by nitrogen-fixing bacteria?
A) Rhizobia release Nod factors; roots release flavonoids; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. B) Rhizobia release flavonoids; roots release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. C) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; nodule forms; infection thread grows into the root cortex. D) Roots release flavonoids; rhizobia release Nod factors; rhizobia proliferate inside of root hair; infection thread grows into the root cortex; nodule forms. E) Nodule forms; infection thread grows into the root cortex; rhizobia proliferate inside of root hair; rhizobia release flavonoids and Nod factors.
Approximately half of known animal carcinogens can be detected by the Ames test.
Answer the following statement true (T) or false (F)
During pregnancy, a maternal antibody transported across the placenta to the fetal bloodstream can cause a problem if the mother ____.
A. has passed on any teratogens B. and baby have different Rh factors C. is producing HCG D. smokes during pregnancy E. uses alcohol during pregnancy
In some species, sex determination is influenced by environmental temperature during development. If you wanted to determine the temperature at which one would obtain a 1:1 sex ratio in a particular species of turtle, which of the following experiments would best address this question?
A. Grow the turtles in three different incubators at temperatures of 26ºC, 28ºC, and 30ºC. B. Grow the turtles in five different incubators at temperatures of 22ºC, 24ºC, 26ºC, 28ºC, and 30ºC. C. Grow the turtles in two different incubators at temperatures of 22ºC and 30ºC. D. Grow the turtles in four different incubators at temperatures of 24ºC, 26ºC, 28ºC, and 30ºC.