The original source of genetic variation that serves as the raw material for evolution is ________.
A. mutation
B. gene flow
C. geographic isolation
D. random fertilization
A. mutation
Biology & Microbiology
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Which type of proteins is embedded in the cell membrane in both active transport and facilitated transport?
A. carrier B. cytoskeletal C. structural D. targeted
Biology & Microbiology
Why is the development of bipedalism considered to be a major advancement in human evolution?
What will be an ideal response?
Biology & Microbiology
Approximately how many base pairs comprise one turn of the double helix in DNA?
a. 2.5 b. 5 c. 10 d. 20 e. 50
Biology & Microbiology
In sickle cell anemia, a ____ mutation in the ?-globin gene eliminates a ____
a. single base-pair; restriction site b. frameshift; restriction site c. nonsense; promoter region d. single base-pair; promoter region e. nonsense; restriction site
Biology & Microbiology