Which respiratory organ normally allows both air and food passage?
Select one:
a. bronchi
b. trachea
c. larynx
d. pharynx
e. nasal cavity
d. pharynx
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The development of acute rheumatic fever and subsequent valvular heart disease are problems that may be encountered by patients infected with:
a. Enterococcus faecalis. b. S. pneumoniae. c. S. pyogenes. d. S. agalactiae.
For water to vaporize
A. energy must be supplied. B. energy must be released. C. hydrogen bonds are broken. D. both energy must be supplied and hydrogen bonds broken. E. both energy must be released and hydrogen bonds broken.
Which of the following adds RNA nucleotides, one at a time, during transcription?
a. RNA polymerase b. DNA polymerase c. RNA nuclease d. transfer RNA e. ribosomal RNA
One important aspect of self-incompatibility is to prevent
A. matings between different species of plants. B. expression of deleterious homozygous recessive genes. C. adherence of pollen to the stigma surface. D. factors that keep pollen from developing. E. genes that may prevent pollen germination.