All of the following are characteristics of vertebrates EXCEPT
A. postanal tails.
B. vertebral columns.
C. internal organs.
D. exoskeletons.
E. skulls.
Answer: D
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Oysters generally settle at right angles to tidal currents. These currents:
a. carry food away from the oysters. b. clear sediments from the oysters. c. help them avoid oyster drills. d. deposit sediments among the oysters.
What is the -35 consensus sequence for the following sequences?
A) TTGATA B) TATGAT C) TATTAT D) ACAA E) TAGTAT
The risk of having a child with Down syndrome due to a chromosomal translocation is independent of maternal age
a. True b. False Indicate whether the statement is true or false
An organism that appears red with a black center on XLD agar is lactose-_____ and H2S-_____
a. positive; positive b. positive; negative c. negative; positive d. negative; negative