The synthesis of a growing strand of DNA is carried out by adding nucleotides to which end of an existing strand?
A. 3'
B. 1'
C. 2'
D. 5'
Answer: A
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The contents of the xylem sap in plant roots are:
A. the same as the solute composition of the surrounding soil. B. always high in sugars. C. always higher in water than the surrounding soil. D. selectively maintained by endodermal cells. E. very acidic.
What type of lipid has four carbon rings and no tails?
a. fats b. steroids c. waxes d. phospholipids e. triglycerides
If a microscopic pin was stuck into the center of a bacterium, what would be the order of the structures encountered
from the outside in?
a. capsule, cell wall, plasma membrane, cytoplasm b. cell wall, capsule, plasma membrane, cytoplasm c. plasma membrane, cell wall, capsule, cytoplasm d. cell wall, plasma membrane, capsule, cytoplasm e. capsule, plasma membrane, cell wall, cytoplasm
Which cell plays a central role in all adaptive immune responses?
A. Dendritic cell B. Mast cell C. Basophils D. NK cell E. T cell