What is the function of Sertoli cells?
What will be an ideal response?
To regulate sperm production and nourish the developing sperm
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Biosafety Level 4 agents:
a. include those that are the common agents of infectious disease. b. require only standard good laboratory technique. c. include M. tuberculosis, M. gordonae, and Brucella. d. require the use of maximum containment facilities.
Why are phosphorylation and dephosphorylation reactions commonly used to regulate signal transduction pathways?
A. The addition or removal of a phosphate group can expose or hide potential binding sites in proteins or change protein activity. B. Phosphate groups are efficient second messengers. C. Protein kinases and phosphatases are abundant in most cells. D. The hydrolysis of bound GTP generates GDP, which can change the activity of proteins bound to GDP.
Which of the following statements about the umbilical cord is false?
A. It contains blood vessels from the embryo B. It contains blood vessels from the mother C. It is derived from the allantois D. It joins the placenta and the embryo E. It carries nutrients and wastes
The cytoplasmic (plasma) membrane of bacteria:
a) retains the cytoplasm and its contents b) acts as a selectively permeable barrier, allowing some molecules to pass while preventing the movement of others c) is the major site of ATP synthesis (respiration) in aerobes d) all of the above