Cell walls of bacteria (domain Bacteria) usually consist of ________, a network of polysaccharide molecules connected by polypeptide cross-links.
Fill in the blank(s) with the appropriate word(s).
peptidoglycan
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Which set of steps best accounts for the role of the axon hillock in nerve cell activity?
A. depolarization, summation, threshold, action potential B. threshold, refractory period, depolarization, action potential C. threshold, action potential, refractory period, summation D. summation, refractory period, threshold, action potential
A robin makes its nest in a maple tree each spring, which helps to protect the eggs from predators, but neither harms nor helps the tree. Which of the following best describes this relationship?
a. Mutualism b. Commensalism c. Parasitism d. Symbiosis
Which enzyme unwinds the DNA during transcription?
a. helicase b. DNA polymerase c. DNA replicase d. RNA polymerase e. RNA replicase
The human disease sleeping sickness is caused by an organism in which group?
a. Diplomonads b. Euglenozoans c. Stramenopiles d. Alveolates e. Amoebozoans