The combination of large numbers and small size collectively gives alveoli what characteristic that is essential to their function?
A) easy inflatability B) low surface area C) high surface area D) low air resistance
Answer: C
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The best term for the process by which some exons are included in a mature mRNA from one cell but are absent from the mRNA in another cell is
A. RNA interference. B. chromosomal remodeling. C. alternative splicing D. Pre-mRNA splicing.
After a decline to an historic low about 300 million years ago, carbon dioxide levels in the Earth's atmosphere rose again for a while. Hypothesize a reason why this occurred.
A. All the vegetation that had been produced in warmer times decayed and released carbon dioxide. B. There was an increase in aerobic bacteria that released large amounts of carbon dioxide. C. There was an increase in oxygen that stimulated respiration and hence greater production of carbon dioxide. D. The low carbon dioxide levels caused cooling of the Earth, resulting in the decline of ancient vegetation; with less vegetation to absorb carbon dioxide, the carbon dioxide levels rose. E. All of the other choices provided are incorrect.
Four of the following maintain genetic equilibrium and allele frequencies. Which one is the exception?
a. lack of gene flow b. large population interbreeding freely c. differential survival and reproduction d. random mating e. absence of mutations
Put the terms in the correct order for the path food takes in a ruminant.
A. reticulum ? abomasum ? rumen ? omasum B. omasum ? reticulum ? abomasum ? rumen C. abomasum ? rumen ? omasum ? reticulum D. rumen ? reticulum ? omasum ? abomasum