A cell is observed under the microscope. What feature will indicate that it has just reached the end of interphase?
A) two separate cells
B) chromosomes that are becoming well defined and visible
C) elongated, noncondensed chromosomes that are difficult to visualize
D) a visible contractile ring
Answer: B
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The common ancestor of the protostomes had a coelom. What does this suggest?
A) All lophotrochozoans have a coelom. B) There are no pseudocoelomates within the protostomes. C) There are no acoelomates within the protostomes. D) The body cavity evolved before the lophophore.
Which of the following minerals are directly involved with light absorption in photosynthesis?
A) Zn B) Mg C) Fe D) Ca E) Na
A scientific theory ____
a. is widely accepted and supported by several evidences b. is widely accepted but not necessarily supported by several evidences c. is sometimes accepted and supported by several evidences d. is sometimes accepted and not necessarily supported by several evidences e. is always a "truth"
There are no trees in the tundra because:a
of the short growing season. b. of the limited supply of nutrients in the soil. c. permafrost limits the depth to which roots penetrate. d. of limited precipitation. e. of low temperatures.