Cells removed from callus that can grow into plantlets illustrates that differentiated cells can be returned to a
totipotent state.
a. True
b. False
ANSWER: True
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Where would you expect to find the plus-end of a microfilament in a crawling cell?
A. near the plasma membrane of the leading edge of the cell B. near the plasma membrane of the trailing end of the cell C. near the cell center D. Answers a and b are both correct.
In addition to the defining features of chordates, ALL craniates are distinguished by which of the following combination of features?
A. a cranium and a gnathostome B. a cranium and neural crest C. a cranium and protostome development D. a cranium and an ostracoderm E. a cranium and an operculum
Which of the following may be found in blood plasma?
A) water and proteins B) water, proteins, nutrients, and ions C) water, proteins, and ions D) water
In an environment in which members of a population compete with each other for resources, a change occurs that selects against members that exhibit a particular dominant trait (the trait exhibits complete dominance). Which graph best depicts the trends in genotypic frequencies that would be expected to occur over time?
A) graph A B) graph B C) graph C D) graph D