Scientists have a complete fossil record showing the evolution of horses over millions of years, with the legs becoming longer and the teeth larger, as ancestors of the modern horse adapted from living in forest to grasslands. This is an example of
A. punctuated equilibrium.
B. extinction.
C. a postzygotic barrier to evolution.
D. gradualism.
E. a prezygotic barrier to evolution.
D. gradualism.
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Which of the following is used in the production of buttermilk and cheese?
A. Enterococcus faecalis B. Streptococcus pneumoniae C. Lactococcus lactis D. Streptococcus mutans
Which of the following describes the exchange of gases between a respiratory surface and the
circulatory system?
a. ventilation b. cellular respiration c. perfusion d. bulk flow e. physiological respiration
The prevalence rate of tuberculosis in one particular county in Texas is 7/1000 people, while the incidence rate for 2011 is 2/1000 people. Analyze this data and summarize the situation.
A. Incidence rate should really be higher than prevalence rate because it includes all new cases for the year. B. The data were collected incorrectly because the two values should match. C. Prevalence rate is higher than incidence rate because the number of people still alive with tuberculosis is higher because of better treatments. D. Prevalence rate and incidence rate cannot be determined for the same disease.
An epigenetic change is one that occurs when a microbial cell produces a toxin or an exoenzyme that directly damages host cells.
Answer the following statement true (T) or false (F)