One of the principal functions of bile is:
a. protecting the stomach lining.
b. enzymatically digesting proteins.
c. stimulating peristalsis.
d. mechanically digesting fats.
e. enzymatically digesting starches
D
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What causes antigenic drift to occur?
A. introduction of new genes from other viruses B. gradual changes in the amino acid sequence of viral proteins C. gradual changes in the viral genome due to replication errors D. gradual changes in both the amino acid sequence of viral proteins and the viral genome due to replication errors
Cnidarians have _____ symmetry
A. no B. radial C. bilateral D. circular
Maximum Likelihood and Bayesian Methods
A. involve the use of an evolutionary model. B. are a set of assumptions about how evolution is likely to happen. C. can be applied along with the principle of parsimony. D. ask the questions "what is the probability that an evolutionary model and proposed phylogenetic tree would give rise to the observed data and what is the probability that a particular phylogenetic tree is correct given the observed data and particular evolutionary model" respectively. E. involve the use of an evolutionary model; are a set of assumptions about how evolution is likely to happen; can be applied along with the principle of parsimony and ask the questions "what is the probability that an evolutionary model and proposed phylogenetic tree would give rise to the observed data and what is the probability that a particular phylogenetic tree is correct given the observed data and particular evolutionary model" respectively.
Four of the five answers represent events that occurred when free oxygen (O2) became available in the atmosphere. Select the exception
a. aerobic respiration emerged. b. some organisms changed their metabolism. c. some species that could not detoxify free radicals became restricted to the low-oxygen environments that remained. d. oxygen was toxic to many species and some cells and forms of life became extinct. e. photosynthesis was no longer a common form of energy production.