Nutrient molecules are used to build cellular structures or for energy. This best represents which characteristic of life?
a) living things are adapted
b) living things respond to stimuli
c) living things are homeostatic
d) living things grow and develop
e) living things acquire materials and energy from the environment
Ans: e) living things acquire materials and energy from the environment
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The giant squid axon has been used extensively in research to determine the mechanisms by which neurons generate electrical signals. Scientists used microelectrodes to measure the resting membrane potential (inside relative to outside) and discovered a difference of
A. -70 mV. B. 300 mV. C. -300 mV. D. 70 mV. E. 0 mV.
Mitochondrial gene defects most often affect the ____________________ and the ____________________. Fill in the blank(s) with the appropriate word(s)
Growing useful mutants that develop from callus culture is called
a. fragmentation. b. protoplast fusion. c. somaclonal section. d. grafting. e. apomixis.
Following its initial activation, how does a G protein become inactivated?
A. It spontaneously loses activity within a few seconds. B. The G-protein ? subunit containing a GTP eventually reassociates with the G-protein ?? dimer. C. The G-protein ? subunit GTP is hydrolyzed to GDP allowing reassociation of the G-protein ? subunit and ?? dimer. D. The receptor becomes internalized. E. The G-protein ? subunit is digested and recycled.