Almost all cacti are native to the Americas, but there is a small, relatively uncommon group of plants closely related to cacti native to tropical western Africa. How can we explain this given the information in this chapter?
A) This might have been caused by divergent evolution.
B) The plants might have floated across the Atlantic.
C) The continents were once connected.
D) All of the above are true.
Answer: C
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Steroids
a. have no fatty-acid component. b. consist of four rings. c. may have different numbers, types, and positions of functional groups attached to them. d. are a specialized type of lipid. e. are described by all of these
Ultraviolet radiation is an effective means of sterilizing surfaces.
Answer the following statement true (T) or false (F)
Filtration is the process by which plasma is forced through tiny holes in the capillary walls by blood pressure and into the upstream end of the nephron
Indicate whether the statement is true or false
When a gene is duplicated:
a. it may be lost through mutation. b. it may become nonfunctional through mutation. c. it may gain a new activity. d. All of the above. e. None of the above.