When a receptor binds to its G protein, which of the following happens next?
a. The signaling molecule binds to the receptor.
b. The G protein activates an enzyme.
c. The three G protein subunits come together.
d. GTP is replaced by GDP.
e. GDP is replaced by GTP.
E
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Environmentalism is ________.
A. the study of ecosystems B. a philosophical and social movement concerned with preserving the environment C. the study of how energy flows through an ecosystem D. the same discipline as ecology
Which of the following is not correct regarding the purple photosynthetic bacteria photosynthetic apparatus?
A. Possesses bacteriochlorophylls a or b B. Apparatus is straight to decrease surface area and contain reactions C. Has intracytoplasmic membranes (ICMs) to provide space for photosynthetic units (PSUs) D. Performs anoxygenic photosynthesis E. Apparatus is continuous with the plasma membrane
Use the model for conventional signals below to determine which signal level an individual of medium ability should adopt
a. A c. C b. B d. D
How long are restriction endonuclease recognition sequences?
A) 4-12 nucleotides B) 5 to 3 nucleotides C) Length can vary by 100 nucleotides, depends on organism