How many meters are in a kilometer?
A. 1000 meters
B. 100 meters
C. 0.1 meter
D. 0.5 meter
A
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A phospholipid molecule has a polar and a nonpolar end. Because of this, water molecules form
A. polar bonds with the nonpolar end of the phospholipid molecule. B. polar bonds with the polar end of the phospholipid molecule. C. hydrogen bonds with the nonpolar end of the phospholipid molecule. D. hydrogen bonds with the polar end of the phospholipid molecule. E. covalent bonds with the nonpolar end of the phospholipid molecule.
The complete second signal for B cell activation requires which of the following interactions?
A) CD40-CK40L interaction B) cytokine-cytokine receptor interaction C) TH-B cell interaction D) All of these are necessary.
Which structure in the development of the amphibian is equivalent to the primitive knot in bird
development?
a. the archenteron b. the dorsal lip of the blastopore c. the ventral lip of the blastopore d. ectoderm e. endoderm
One way in which organisms may exhibit resistance to a drug is the ability to pump the drug out of the cell immediately after it has entered.
Answer the following statement true (T) or false (F)