Answer the following questions true (T) or false (F)
1. Without photosynthesis, most animal life on the Earth could not survive.
2. Plasmodesmata allow plant cells to communicate with each other.
3. Gap junctions are found in plant cells.
1. TRUE
2. TRUE
3. FALSE
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The water vascular system of echinoderms _____
A) functions as a circulatory system that distributes nutrients to body cells B) functions in locomotion and feeding C) is bilateral in organization, even though the adult animal is not bilaterally symmetrical D) moves water through the animal's body during suspension feeding E) is analogous to the gastrovascular cavity of flatworms
Where would you expect to find the receptor for a nonpolar ligand?
A. on the cell surface B. in the nucleus of the cell C. in the cytosol D. either in the nucleus of the cell or in the cytosol
Which is NOT ordinarily capable of being reduced at
any time? a. NAD+ b. FAD c. oxygen, O2 d. water e. all of these
Phytoplankton is an example of a ________
A) producer B) consumer C) herbivore D) decomposer