Evolutionary trees are constructed using all of the following except:
A. similarities in the physical structure of organisms.
B. similarities in the embryological development of organisms.
C. similarities in the DNA sequences of organisms.
D. tissue samples.
Answer: D. tissue samples.
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Defining features of the halobacteria include
A. the production of methane. B. absolute dependence on a high concentration of NaCl for growth. C. absolute dependence on temperatures above 65ºC for growth. D. absolute dependence on low pH conditions for growth.
The two daughter cells that are formed as a result of binary fission
A. each have about half the number of plasmids as the mother cell. B. are members of the same colony. C. have genetically identical chromosomes. D. Two of the answers are correct. They are members of the same colony and have genetically identical chromosomes. E. All of these statements are correct.
Which of the following statements is false regarding RSV?
A. RSV infects infants aged 6 months and younger; it is unlikely that a 4-year-old would develop a respiratory disease as a result of this virus. B. While RSV is most prevalent in infants 6 months of age and younger, the highest mortality rate is in those children with underlying risk factors such as prematurity. C. Infants aged 6 months and younger are the most susceptible to infection by RSV; however, adults and older children can also become infected with this virus. D. Although RSV is most prevalent in infants aged 6 months and younger, usually by age 2 most children have been exposed to this virus.
The autonomic nervous system ____
a. relays commands to somatic nerves b. is part of the central nervous system c. relays commands to smooth muscles d. is under voluntary control e. responds to sensation in the skin