Consider a living plant cell in a living leaf that is not wilted. The solute potential (?S) of such a cell
____ than that in the fluids surrounding the cell.
a. is typically lower
b. varies widely from higher to lower
c. is typically higher
d. is typically about the same as
e. is typically less negative
A
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Regarding genome sequences and organismal development, it is important to remember that
A. development occurs almost exactly the same way in closely related species. B. development takes longer in some species than in others, and this time factor is important. C. gene sequence within a chromosome determines the timing of the gene expression. D. timing plays an important part in genome sequencing. E. changing the timing of gene expression can have dramatic changes in development.
When did the ocean begin to form?
a. 200 million years ago b. 4.2 billion years ago c. 5 billion years ago d. 3.4 billion years ago
The analysis of parent—offspring conflict in birds has generated some interesting observations. For example, researchers hypothesized that chicks should beg to be fed by their parents more loudly when their nestmates are less closely related. (See Figure A, where Of = optimal parental investment where the lost siblings are full sibs, and Oh for an offspring whose lost siblings are half sibs.)
Do the data collected bear this out (Figure B)? Figure A Figure B A) Yes, species that evolve extra-pair parentage also tend to evolve louder begging chicks. B) No, the genetic relatedness of the chicks has nothing to do with the level of begging by chicks. C) The data are inconclusive; no conclusion can be formulated.
Which of the following living reptiles care for their young and have a four-chambered heart, as birds do?
A. lizards B. crocodiles C. turtles D. tuataras E. snakes