The flow rate of a gas through a tube is proportional to the diameter of the tube. Through which structure in the human respiratory system does air flow the fastest?
A) bronchiole
B) trachea
C) bronchus
D) alveoli
Answer: B
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In the above figure, which of the following would
have a diploid number of chromosomes? a. zygote b. multicelled sporophyte c. spores d. multicelled gametophytes e. both a and b
Molecular biologists can determine experimentally whether a region of DNA contains closed chromatin or open chromatin by assessing the sensitivity of the region to __________
A) nucleosomes B) histone deacetylase C) RNA polymerase II D) methyltransferase E) DNAse
Bony fishes possess two features not found in other fish. Select the best choice from those listed below to complete the following sentence. Bony fishes have
A. swim bladders and movable jaws. B. swim bladders and a closed circulatory system. C. swim bladders and a complete digestive system. D. swim bladders and gill covers called opercula.
The type of evolution that involves speciation is called
A. macroevolution B. microevolution C. coevolution D. natural selection E. phyletic gradualism