The peptide bond is _____.
A. a hydrogen bond
B. an ionic bond
C. a covalent bond
D. a van der Waals interaction
E. none of the above
Ans: C. a covalent bond
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Which statement is true?
a. All animals with hearts have closed circulatory systems. b. Birds and crocodiles have pulmocutaneous circulation. c. All blood circulated through fish hearts is deoxygenated. d. Double circulation is a feature of all mammals and some birds.
The visual deficit related to a misshapen cornea is ____
a. red-green color blindness b. astigmatism c. hyperopia d. myopia e. cataracts
Cigarette smoking can sometimes lead to development of a "smoker's cough," which results from paralysis of cilia in the airways. Why would the paralysis of cilia lead to smoker's cough?
A) Paralyzed cilia can no longer clear the airways of mucus, so coughing helps remove it. B) Paralyzed cilia can no longer provide an immune response to protect the airways from harmful compounds in the smoke, so coughing is used to try to prevent the compounds from damaging the airways. C) Paralyzed cilia lead to a nervous response that "tickles" the airways and induces coughing. D) Paralyzed cilia push mucus downward into the alveoli, which coughing attempts to remove.
What are the three intertwined features that biodiversity is built out of?
A. Ecosystem diversity B. Species diversity C. Population diveristy D. Genetic diversity