Tracheids differ from vessels in that _________
A. they lack end-walls
B. they lack pits
C. they are formed from a single cell
D. water enters and exits through pits
C
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________ fluid is found in the space between tissues while ________ fluid is found within the blood
a. Plasma, cytoplasm b. Interstitial, cytoplasm c. Interstitial, plasma d. Plasma, interstitial e. Cytoplasm, plasma
Trace the path of a chef's salad with croutons down the digestive tract, and explain what takes place in
each specialized region. What will be an ideal response?
G protein-linked receptors are transmembrane proteins that convert an extracellular hormone signal
into an intracellular signal that affects certain cell processes. ____________________ Indicate whether the statement is true or false.
Phospholipids assemble spontaneously into bilayers driven by the attraction of their "tail" portions to each other and of their "head" portions to each other. The "head" portions are:
A) hydrophobic. B) composed of carbon-hydrogen chains. C) hydrophilic. D) nonpolar. E) directed away from intra- and extracellular fluid.