Most true fungi send out cellular filaments
called
a. mycelia.
b. hyphae.
c. mycorrhizae.
d. stolons.
e. rhizoids.
B
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Irrigation reduces soil quality, but rains usually do not. Why?
A) Rains deliver less water to soil than irrigation does. B) Water used for irrigation contains fertilizer and pesticides that affect soil quality. C) Rainwater contains lower amounts of salt. D) The fast water flow during irrigation removes organic material from soil. E) The fast water flow during rains is able to remove toxic materials from topsoil.
The first known fossils of living cells were preserved in rocks that are 3.5 billion years old, but scientists postulated that the first cells arose many millions of years prior to this time. These first cells were most likely ...
A. aerobic, photosynthetic, eukaryotic. B. aerobic, photosynthetic, prokaryotic. C. anaerobic, heterotrophic, prokaryotic. D. anaerobic, heterotrophic, eukaryotic. E. anaerobic, chemotrophic, eukaryotic.
In bird embryos, the pathway for cell migration into the blastocoel is formed by the ____, while in frog embryos, the
pathway for cell migration into the blastopore is formed by the ____.
a. archenteron; dorsal lip of the blastopore b. epiblast; dorsal lip of the blastopore c. primitive groove; ventral lip of the blastopore d. primitive groove; dorsal lip of the blastopore e. hypoblast; ventral lip of the blastopore
Which of the following statements regarding leptospirosis in incorrect?
A. The causative organism is a spirochete. B. Humans acquire it by contact with abraided skin or mucous membranes. C. It is most common in cattle, horses, pigs, and dogs. D. It can be transmitted by animal bites. E. The causative organism infects the kidneys, liver, brain, and eyes.