Tolerance is the acquired ability to make an adaptive immune response directed to self-antigens
Indicate whether the statement is true or false.
Answer: FALSE
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Plant cells often have a large membrane-bound sac that is used for storing water and other substances called a:
A. central vacuole. B. Golgi body. C. centriole. D. chloroplast. E. nucleus.
Obligately anaerobic normal flora are found in ________, which is an/are anoxic habitat(s) of the body
A) the kidneys B) the skin C) portions of the oral cavity D) the lungs
Which of the following is TRUE of melanosomes?
a. All people have about the same number of melanosomes. b. The color of the melanosome dictates skin color. c. Excess sunlight decreases melanin. d. White Europeans lack melanosomes. e. All of these are true.
During neuronal signaling, a change in membrane potential will cause sodium channels to open and let Na+ ions diffuse down their concentration gradient into the cell. Which of the following helps establish the concentration gradient necessary for this process to occur?
A. voltage-gated Na+ channel B. Na+/K+ channel C. Na+ symporter D. Na+/K+ pump