Which statement about nematodes is most accurate?
A) They are mainly crop pests.
B) They are mainly parasites.
C) They all have straight, flattened bodies.
D) They have exoskeletons made of cellulose.
E) They fit into numerous ecological roles including detritivores.
Answer: E
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Genetic variation is accomplished by all but one of the following. Choose the exception
A) the events of meiosis I B) crossing over C) independent assortment D) the events of meiosis II
What type of blood vessel is solely responsible for exchange between the blood and the interstitial fluid?
A) artery B) arteriole C) capillary D) venule
Over 470,000 cases of cholera were reported in Haiti in the two years following the 2010 earthquake. Which of the following was the most likely mode of transmission?
A) mosquitoes B) aerosols C) contact D) contaminated water E) contaminated milk
Probes used for detecting genetic sequences are frequently composed of
A) agarose. B) synthetic nucleic acids and labeled conjugates, such as fluorescent dyes. C) restriction enzymes. D) silicon chips. E) nitrocellulose.