Several types of T cells have been shown to be able to provide help for B cells during activation. Which of the following statements is TRUE?
A. All produce the same chemokine to activate but provide different CD40 signals.
B. All produce the same chemokine, and the same CD40 signal as well.
C. All provide CD40 signaling but produce different chemokines.
D. All provide CD40 signaling but trigger distinct class switching.
E. Both C and D.
E
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Answer the following statements true (T) or false (F)
1. Dentin in the teeth is the hardest substance in the body. 2. Air and food share sections of the pharynx. 3. The pyloric sphincter is also called the cardiac sphincter. 4. Peristalsis is a wave-like muscular contraction that propels food through the digestive system. 5. The jejunum receives food from the stomach.
The mental disorders referred to as ________ are characterized by intense sexual urges, fantasies, or other sexual activities that are not consensual and cause harm.
Fill in the blank(s) with the appropriate word(s).
Sickle-cell anemia is preventable by maintaining a proper diet
Indicate whether the statement is true or false
Indicate which syllable receives the emphasis when pronouncing the term petechia.
A. 1st syllable: puh B. 3rd syllable: kee C. 4th syllable: yah D. 2nd syllable: tee