The phylum ________ is thought to represent the oldest branch of the bacteria.
A. Aquificae
B. Spirochetes
C. Cyanobacteria
D. Thermotogae
Answer: A
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A graph of "wolf kills vs. caribou density" rises rapidly and then flattens because ________
a. at higher prey densities, the predator cannot catch, eat, and digest the prey in a way that is proportional to prey density b. the wolf switches to a different prey c. it is a type I response d. the number of hiding places for caribou decreases
The first level of inquiry in making a systematic
survey of biodiversity is carried out a. at the ecoregion level. b. among the riparian zones. c. in hot spots. d. at the regional research station. e. on a global scale.
The viral oncogene associated with the Rous sarcoma virus is the
A) RAS gene. B) p53 gene. C) ERBB2 gene. D) v-sis gene. E) src gene.
How do the seeds of angiosperms differ from those of gymnosperms?
What will be an ideal response?