Figure 25.20
Questions 27 and 28 refer to the figure above.
The letter "E" in the accompanying figure represents the ____.
A. humerus
B. pectoral girdle
C. skull
D. sternum
E. pelvic girdle
Answer: D
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Which of the following statements about a carbon-carbon double bond is correct?
A. Each of the two carbons is capable of bonding to three other atoms. B. The double bond allows free rotation of the molecule at the bond position. C. The double bond is longer than a corresponding carbon-carbon single bond. D. Double bonds can be found in cyclical structures. E. None of these statements about carbon- carbon double bonds is correct.
Which gas do plants require for photosynthesis?
a. Oxygen b. Carbon dioxide c. Nitrogen d. Phosphorus
The fact that the earth does not go up in flames
in spite of the richness of oxygen in our environment is related to which of the following concepts?
a. the activation energy needed to break bonds. b. the fact that reactants always have less energy than products. c. the first law of thermodynmics. d. the second law of thermodynamics. e. the abundance of water in our atmosphere which inhibits combustion
The type of system depicted in Figure 44-1:
a. can be found in arthropods. b. can be found in cephalopods. c. can be found in annelids. d. has hemoglobin as the oxygen transporting pigment. e. can be found in arthropods and annelids.