Which of the following are absorbed by the
lymphatic system?
a. monosaccharides
b. amino acids
c. triglycerides
d. nucleic acids
e. proteins
Answer: c
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Plasma membrane phospholipids are labeled with a fluorescent tag and then the phospholipids in one area are bleached with a laser beamto eliminate the fluorescent signal. What would one observe after the cell is incubated for a few minutes?
A. The bleached molecules would disappear into the cell. B. The bleached molecules would diffuse laterally through the membrane and intermix with unbleached molecules. C. The bleached molecules would remain in the spot where bleaching occurred. D. All the bleached molecules would flip-flop across the cell membrane. E. The bleached molecules would be released from the cell.
A cell membrane is a lipid _________ because the phospholipids line up in TWO ROWS to try and keep their ______________ tails away from water.
Fill in the blank(s) with the appropriate word(s).
The cause of stomach ulcers appears to be
A. excess stomach acid. B. diets rich in meat products. C. drinking too much coffee. D. extreme stress. E. the bacterium Helicobacter pylori.
Which source(s) of data do evolutionary biologists use to test their hypotheses:
a. molecular data c. morphological and behavioral data b. data from the fossil record d. All of the above