Purine bases, such as adenine and guanine, have ________ joined ring(s) for their structure, compared to pyrimidine bases, such as cytosine and thymine, that have ________ ring(s) in their structure.
Fill in the blank(s) with the appropriate word(s).
two, one
Biology & Microbiology
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Trial-and-error learning is also called ____ conditioning
Fill in the blank with the appropriate word.
Biology & Microbiology
In what type of population would evolution occur most rapidly?
A) a large population with a large gene pool B) a small population with a relatively diverse gene pool C) a small population with a small gene pool D) a large population with a relatively limited gene pool
Biology & Microbiology
Which of the following indicates a poorly designed study?
A) a control group B) variables were controlled C) bias D) follow-up studies
Biology & Microbiology
The statistical study of populations including sex ratio, age structure, and predicting growth rates is called ________.
A. biometrics B. population genetics C. ethology D. demography
Biology & Microbiology