A researcher is interested in creating a phylogenetic tree showing the evolutionary relationship of several
cyanobacterial species based on the closeness of their nitrogenase gene sequences. Which field of research most directly
applies to the researcher’s project?
a. comparative proteomics
b. comparative genomics
c. comparative transcriptomics
d. comparative phylogenetics
e. comparative phenotype
ANSWER: b
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What is the role of a countercurrent exchange?
a. It allows for an efficient exchange. b. It reduces a concentration gradient. c. It allows ventilation to occur more rapidly. d. all of these
An animal that finds its way by the mechanism known as piloting is using ____
a. familiar landmarks to guide his journey b. the sun's position in the sky to orient himself c. both the sun's position and a mental map d. the Earth's magnetic field to orient himself e. another animal to lead the way as he learns the route
Put the stages of infection in order starting with the first stage at the top:
a. Prodrome b. Convalescent period c. Incubation period d. Acute period
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Figure 34.5
What is the most likely cause of the excessive growth exhibited by the person in the center of the accompanying figure?
A. Pituitary tumor B. Lack of GH receptor response C. Low levels of rhGH D. Cretinism E. Laron syndrome