Every protein has a unique shape and function because:
A) each protein has a unique sequence of amino acids.
B) the bonds between the amino acids vary from protein to protein.
C) the number of nitrogen atoms in each amino acid differs.
D) each protein has a unique sequence of nucleotides.
Answer: A
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Four of the five answers below are soil contaminants that can be phytoremediated by plants. Select the exception
a. nitrogen b. lead c. arsenic d. mercury e. trichloroethylene
A tumor is a population of rapidly dividing and growing cancer cells that progressively does lead to mutations
a. true b. false
Where does gas exchange occur in the mammalian lung?
A) Bronchioles B) Alveoli C) Bronchi D) The pharynx E) The trachea
Which of the following statements concerning plasma cells is FALSE?
A. They live for many years and function as memory cells. B. They are descended from activated B cells. C. They can produce large quantities of antibodies on a daily basis. D. They secrete a single type of antibody molecule specific for a single epitope. E. The antibodies they produce can remain in circulation for weeks.