What is the name given to the opening that allows blood to flow from the right atrium directly into the
left atrium of the fetal heart?
a. ductus arteriosus
b. foramen ovale
c. vernix caseosa
d. ductus venosus
e. lanugo
B
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Variation among individuals in a species is usually caused by:
A. environmental variation. B. genetic variation. C. infectious variation. D. both environmental variation and genetic variation. E. environmental variation, genetic variation, and infectious variation.
Based on the biological hierarchy of organization, which of the following would be more inclusive than a cell?
a. atom b. organism c. molecule d. organelle
The hypothesis that mitochondria and chloroplasts evolved from bacteria is called
A. endosymbiont hypothesis. B. RNA world hypothesis. C. ribozyme engulfment hypothesis. D. exosymbiont hypothesis. E. organellization hypothesis.
Which of the following types of organisms is associated with foodborne illness?
A) mesophiles B) psychrophiles C) thermophiles D) extreme thermophiles E) psychrotrophs