Which fetal structure carries blood from the pulmonary trunk to the aorta?
A. Bulbus cordis
B. Ductus arteriosus
C. Foramen ovale
D. Sinus venosus
E. Truncus arteriosus
Answer: B
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AB ? A + B is an example of a(n) ________ reaction.
Fill in the blank(s) with the appropriate word(s).
Second-order neurons of ascending pathways that contribute to sensory perception terminate in the ________
A) somatosensory cortex B) spinal cord C) thalamus D) medulla
Interferon is a group of hormonelike peptides that cells produce in response to
A) bacteria. B) fungi. C) chemical irritants. D) viruses.
Which of the following is NOT a characteristic of a catalyst?
A. It can change the final result of the reaction. B. It is not changed itself at the end of the reaction. C. It increases the rate of the reaction. D. It does not change the nature of the reaction.