The effect of DDT on birds is a result of which three characteristics of DDT?
a. metabolism, persistence, and biological magnification
b. bioaccumulation, metabolism, and resistance
c. biological magnification, resistance, and persistence
d. persistence, bioaccumulation, and biological magnification
e. metabolism, resistance, and biological magnification
d
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The synthesis of a growing strand of DNA is carried out by adding nucleotides to the ___ end of an existing strand.
A. 2' B. 3' C. 5' D. 1'
Which of the following is an example of a processive enzyme?
A. DNA polymerase I B. DNA polymerase III C. DNA ligase D. Okazaki fragments
Which of the following occurs during human inhalation?
a. The diaphragm contracts and the external intercostal muscles relax. b. The diaphragm relaxes and the external intercostal muscles contract. c. The diaphragm contracts and the external intercostal muscles contract. d. The diaphragm relaxes and the external intercostal muscles relax. e. The diaphragm expands and increases oxygen uptake.
Which of the following is NOT true of ciliates?
a. they have no cell wall b. some are autotrophs c. most live in seawater or fresh water d. some live in mammalian guts e. one species is a human pathogen