In the second-messenger system, what serves as the first messenger?
A) cyclic AMP (cAMP)
B) DNA
C) ATP
D) the hormone
E) mRNA
D
You might also like to view...
The muscles of the esophagus move food through a rhythmic muscular contraction known as ________.
A. adventitia B. muscularis C. digestion D. peristalsis
You would like to see what infections a patient has been fighting recently; one way to do this is to isolate cytotoxic T cells and look into their phagosomes to see what pathogens they have been engulfing through phagocytosis.
Answer the following statement true (T) or false (F)
Spermatogenesis and testosterone production are interdependent events, meaning that neither process can occur without the other.
Answer the following statement true (T) or false (F)
This figure shows the knee joint. Which number indicates the tibial collateral ligament?
A. 1 B. 2 C. 3 D. 5 E. 6