Saltmarsh cordgrass is known as a(n)_____ because patches slow the velocity of incoming tides and stabilize stormy
beach habitat.
a. parasite
b. foundation species
c. symbiote
d. mimic
e. ecotone
ANSWER: b
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The leukocyte responsible for adaptive immunity is the
A. lymphocyte. B. monocyte. C. eosinophil. D. neutrophil.
In the cerebral cortex, layer 3 is especially noticeable because it:
A) is a different color from the rest B) contains many large neurons C) contains many fibers D) contains no neurons
Using Figure 17.5 in your textbook, identify a 5' 3' sequence of nucleotides in the DNA template strand for an mRNA coding for the polypeptide sequence Phe-Pro-Lys.
A. 5'-CTTCGGGAA-3' B. 5'-UUUGGGAAA-3' C. 5'-AAACCCUUU-3' D. 5'-GAACCCCTT-3' E. 5'-AAAACCTTT-3'
What is the best explanation for the observation that eukaryotes that seem superficially simple can have much larger genomes (in terms of mass or number of base pairs) than organisms that have complex anatomy, structure, or behavior?
A. Animals with simple body plans are adapted for rapid DNA replication. B. Some organisms have a tremendous amount of noncoding DNA, like repetitive sequences. C. Alternative splicing and overlapping genes are rampant among eukaryotes. D. Simpler organisms require more chemical defenses against enemies. E. DNA in the mitochondria and chloroplasts are not counted in these measurements of genome size.