Who proposed the fluid mosaic model of cell membrane structure in 1972?
a. Davson and Singer
b. Frye and Edidin
c. Brown and Goldstein
d. Singer and Nicholson
e. Davson and Danielli
D
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In Chapter 2, you learned about beneficial bacteria that live on our skin and lower the pH,
which in turn keeps other disease-causing bacteria in check. This relationship between beneficial bacteria and their human hosts is an example of __________.
a. coevolution b. adaptive radiation c. sexual selection d. mutation
The ____ use solar energy and organic molecules as their nutritional sources
a. chemoautotrophs b. chemoheterotrophs c. photoautotrophs d. photoheterotrophs e. Archaea
Potassium-40 is useful in determining the age of a fossil in samples
A. 300,000 years of age and older. B. aged between 100,000 and 250,000 years. C. aged between 50,000 and 100,000 years. D. less than 50,000 years of age. E. less than 25,000 years of age.
Through the study of mitochondrial disorders, scientists have suggested a link between the decline of mitochondrial function and aging. What process appears to be involved in this suspected phenomenon?
A) accumulation of sporadic mutations in the nuclear genome B) accumulation of mutations in the mtDNA C) recombination of mtDNA and nuclear DNA D) decline of mutations in the nuclear genome E) recombination among mtDNAs of different mitochondria