The chemical digestion of proteins begins in the _____
A) mouth
B) stomach
C) small intestine
D) bloodstream
Answer: B
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Polychlorinated biphenyls (PCBs) are toxic chemicals that were widely used in manufacturing until they were banned in the U.S. in 1977. PCBs are very persistent in the environment and bind strongly to sediments, meaning that bottom dwelling and filter feeding organisms are likely to take in PCBs as they feed. PCBs accumulate in the fatty tissues and, to a lesser extent, muscle tissues of organisms. Examine the food web below. Which species do you predict would have the highest concentration of PCBs in their tissues?
A. shrimp B. mussels C. seal D. heron E. salmon
Which of the following organisms would likely have the most complex nervous system?
a. sea turtle b. sea anemone c. earthworm d. Portuguese man-of-war
After the first meiotic division, the two daughter cells ____
a. are identical to each other b. replicate their DNA before dividing again c. contain unequal chromosome numbers d. have half the diploid number of chromosomes e. always contain equal numbers of paternal and maternal chromosomes
How long ago did the hominin evolutionary
line diverge from that leading to the great apes? a. about 3 million years ago b. between 10 million and 5 million years ago c. during the Eocene epoch d. less than 2 million years ago e. about 1.5 million years ago