A reason that some antibiotics harm bacteria, but not humans, is because the antibiotic inhibits bacterial enzymes that humans do not have.
a. true
b. false
Answer: a. true
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What region of the heart acts as the heart's pacemaker?
A) sinoatrial (SA) node B) atrioventricular (AV) node C) semilunar valve D) ventricle
What would be the best anatomical feature to look for to distinguish a gastropod from a chiton?
A) presence of a muscular foot B) presence of a rasp-like feeding structure C) production of eggs D) number of shell plates
The rigid chitinous exoskeleton of an arthropod has all of the following functions except it
A. prevents injury to the animal. B. impedes water loss. C. provides a place for muscle attachment. D. maintains a uniform size for all individuals of that species. E. protects the animal from predators.
The following steps occur during biosynthesis of a + strand RNA virus. What is the third step?
A) attachment B) penetration and uncoating C) synthesis of - strand RNA D) synthesis of + strand RNA E) synthesis of viral proteins