QUESTION 5 • Which of the following is true of mycorrhizae? . . . They are paras
ID: 220182 • Letter: Q
Question
QUESTION 5
• Which of the following is true of mycorrhizae?
. . . They are parasitic on plants, deriving their energy from digesting and absorbing plant tissues.
. . . They fix atmospheric nitrogen, making it available to plants.
. . . Only a few vascular plants have mycorrhizae, but these include important food crops such as wheat and corn.
. . . They make phosphate available to plants and increase surface area for water absorption
• .
QUESTION 6
• Some archaeans are extremophiles, such as those that survive very high temperatures or extremely salty conditions. An archaean that can survive a very low pH might be called a/n:
. . . thermophile
. . . alkalophile
. . . acidophile
. . . methanogen
. . . halophile
• .
QUESTION 7
• Many protists such as dinoflagellates, stramenopiles, and euglenids contain plastids that have three or even four membranes, as well as DNA similar to that of cyanobacteria. A hypothesis that explains these characeristics is:
. . . transformation
. . . conjugation
. . . binary fission
. . . transduction
. . . endosymbiosis
• .
QUESTION 8
• Suppose you are involved in research investigating the cause of an emergent disease that impairs the function of nervous tissue. You wish to begin by isolating the pathogen. To do this, you extract DNA and RNA from infected nervous tissue so you can determine whether the pathogen is closely related to any known pathogens. To your surprise, you find that the extracted DNA and RNA belong only to the host. Given this result, which of the following conclusions could you most appropriately make?
. . . The disease may be caused by a prion.
. . . The disease may be caused by a protist.
. . . The disease may be caused by a fungus.
. . . The disease may be caused by a virus.
. . . The disease may be caused by a viroid.
Explanation / Answer
5. They make phosphate available to plants and increase surface area for water absorption.
6. acidophile
7. endosymbiosis
8.The disease may be caused by a prion.