All the following pertain to measles (rubeola), except
A. symptoms include dry cough, sore throat, fever, and conjunctivitis.
B. it is transmitted by direct contact with the rash.
C. secondary bacterial otitis media and sinusitis occur.
D. humans are the only reservoir for the pathogen.
E. it may involve a fatal complication called subacute sclerosing panencephalitis (SSPE).
Answer: B
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Which organism is classified as nekton?
a. sponge b. clam c. sea anemone d. fungi e. whale
Carotenoids are important to many plants because these pigments are able to
A. store electrons for use during the "dark" reaction of photosynthesis. B. absorb water so that hydrolysis can be carried out in the chloroplasts. C. absorb wavelengths of light that neither chlorophyll a nor b can absorb. D. capture UV radiation that is harmful to the DNA in the nucleus of plant cells. E. remove carbon dioxide from the air.
Desert plants often have ________ in their seed coats that keep them dormant until there is enough rain to complete their life cycle
A) digestive enzymes B) cold-sensitive compounds C) drying agents D) water-soluble chemicals E) wetting agents
In somatic cells, if a base is mismatched in one new daughter strand during DNA replication, and is not repaired, what fraction of the DNA duplexes will have a permanent change in the DNA sequence after the second round of DNA replication?
(a) 1/2 (b) 1/4 (c) 1/8 (d) 1/16