What process requires oxygen to function?
A. Aerobic respiration
B. Anaerobic respiration
C. Alcoholic fermentation
D. Lactate fermentation
E. Substrate-level phosphorylation
Answer: A
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A distinctive feature of eukaryotes is the organization of tightly packaged chromosomal DNA with proteins into a membrane-bound structure called a:
A. nucleolus. B. cell. C. nucleus. D. plasma membrane.
Dendritic cells are phagocytes with antigen-presenting properties
Indicate whether the statement is true or false.
Which of the following is the correct order of events in the control of the heartbeat?
1. activation of the SA node 2. contraction of the atria 3. contraction of the ventricles 4. activation of the AV node 5. transmission of the action potential through a set of modified muscle fibers A. 1, 2, 4, 5, 3 B. 1, 4, 2, 5, 3 C. 1, 3, 4, 2, 5 D. 1, 5, 4, 2, 3 E. 1, 2, 5, 4, 3
If the stimulus is large enough at the trigger zone, the membrane potential reaches ____, and an action potential begins
a. positive charge b. maximum voltage c. resting potential d. threshold potential e. minimum ionic concentration gradient