What is the proper sequence in the flow of air in
mammals?
a. nasal cavities, larynx, pharynx, bronchi, trachea
b. nasal cavities, pharynx, bronchi, larynx, trachea
c. nasal cavities, pharynx, larynx, trachea, bronchi
d. nasal cavities, larynx, pharynx, trachea, bronchi
e. nasal cavities, bronchi, larynx, trachea, pharynx
Answer: c
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The first evidence of where the nerve cord will lie in the embryo is the
a. neural tube. b. chorionic villus. c. embryonic somite. d. primitive streak. e. neural plate.
A protein that has been transported past the outer chloroplast membrane would have to pass how many more membranes to reach the stroma and thylakoid lumen, respectively?
A. 3,4 B. 1,2 C. 2,3 D. 0,1
Core reserves are areas where
A) humans are allowed to use and develop the areas as they see fit. B) wildlife species benefit from extensive conservation programs, including nurseries and clinics. C) only human activities that have low impact on the native wildlife are allowed. D) humans have irrevocably destroyed the local ecosystem. E) humans are forbidden from entering.
Imagine that a pharmaceutical company was successful at producing a drug based on the CCR5 gene product that is effective at preventing the contraction of AIDS. However, shortly after the drug has been in use, patients and doctors report that the drug is
not as effective as it once was. What is the most likely explanation for this result? A) The people taking the drug have built up a tolerance to the drug. B) Some HIV viruses have genetic variations in the RNA genome that provide resistance to the actions of the drug. C) The HIV virus gained mutations in its DNA genome in order to become resistant to the actions of the drug. D) The DNA of white blood cells of the people taking the drug has mutated to become resistant to the drug.