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

Biology & Microbiology

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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

Biology & Microbiology

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?

Biology & Microbiology

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.

Biology & Microbiology

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.

Biology & Microbiology