The structure that covers the opening to the trachea during swallowing, thereby preventing food from entering the air passageway, is the
A. epiglottis.
B. cecum.
C. rumen.
D. uvula.
E. soft palate.
A. epiglottis.
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Compare and contrast DNA synthesis in prokaryotes and eukaryotes. What will be an ideal response?
Formed elements in the blood consist of all the parts below except:
A) platelets. B) white blood cells. C) plasma proteins. D) red blood cells.
The polymerase chain reaction (PCR) has been used in all of the following fields, except
A. gene mapping. B. medicine. C. forensics. D. evolutionary studies. E. None of the choices; it is useful for all these fields.
Some populations display continuous variation, which arises when _____.
A) epistatic interactions occur between the products of two or more genes B) environmental factors, such as temperature, vary seasonally C) multiple genes influence the inheritance of the same trait D) crossing over occurs during gamete formation