The profundal zone is characterized by
a. plankton.
b. algae.
c. a variety of plants and animals.
d. decomposers.
e. all of these.
Answer: d
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Autotrophs include which of the following?
(a) fungi. (b) plants. (c) animals. (d) all of the above.
The molecule currently being investigated as a possible means of synthesis of the first proteins is:
A. mRNA. B. DNA. C. tRNA. D. rRNA. E. aminoacyl tRNA synthetases.
Which is true of the cells of a choanoflagellate colony?
a. each cell is genetically unique b. each cell is genetically identical c. each cell has a different chromosome number d. each cell performs the same function as the other cells e. each cell has the ability to switch their sex from male to female and back again
A common adaptation of coastal plants that grow on sand dunes is
A. elevated growth rates. B. secretion of proteinaceous threads. C. increased transpiration of water. D. broad leaves for enhanced photosynthesis. E. deep roots to extract moisture.