Choose the statement that is correct about the frequency of mitosis
A) Some cells, such as leaf cells, cease to divide after mature size is reached.
B) All cells divide throughout the existence of a multicellular eukaryote.
C) Brain cells are easy to replace because they divide frequently after maturity.
D) Bone marrow cells are an example of cells that cease to divide after maturity.
Answer: A
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Fossils of the earliest known true hominids are
approximately how many millions of years old? a. more than 20 b. about 10 c. between 5 and 2 d. less than 0.5 e. none of these
Which communication method is most effective over short distances?
A) Vocalizations B) Pheromones C) Touch D) Dominance hierarchies E) Visual communication
Which of the following represents the collective forces that move water upward in xylem?
a) root pressure b) gravity c) transpiration d) active transport e) translocation