Which of the following statements about Archaeopteryx is FALSE?
A. It is the ancestor of modern birds.
B. It shows a combination of reptilian and bird
-like features.
C. It provided clear evidence of the close
relationship between birds and dinosaurs.
D. It had a long, bony, reptilian tail.
E. It had asymmetrical feathers like a modern
bird.
A
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Jacques Cousteau is best known for helping to perfect which marine technology
A. Sonar B. Remote sensing C. Scuba diving equipment D. Remotely operated vehicles (ROVs)
The process by which microorganisms cause diseases is known as
A) pathogenesis. B) virulence. C) LD50 (lethal dose50). D) infection.
Which of the following are not topoisomers?
A. two molecules having the same number of base pairs but different linking numbers B. two molecules having a different number of base pairs but the same linking number C. two molecules having the same number of base pairs, but one is positively supercoiled and the other is negatively supercoiled D. two molecules having the same number of base pairs, but one is underwound and the other is overwound E. All of these choices are topoisomers.
A codon is composed of how many bases?
A. one B. four C. three D. 64 E. two