Which of the following statements about the polymerization of macromolecules is false?
A) Often the energy needed for polymerization is supplied by ATP.
B) The polymer chain usually has two different ends.
C) Water is added to join the monomers of the macromolecules.
D) A monomer is usually activated by the coupling of the monomer to a carrier.
E) Macromolecules are synthesized by the stepwise addition of monomers.
C) Water is added to join the monomers of the macromolecules.
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Eustachian tube connects the middle ear and which of the following?
Light availability within a forest is lowest in the
A) canopy layer. B) midstory layer. C) understory layer. D) ground layer.
Which of the structures in Figure 50-3 is responsible for the production of hormones?
a. 1
b. 3
c. 4
d. 6
e. 7
Opportunistic organisms are those that:
a. are usually commensals but can cause disease when body defenses are suppressed b. usually cause disease in a previously healthy person when they enter through the correct portal of entry c. inhabit the intestine but are incapable of causing disease. d. require a vector