A proenzyme secreted by the pancreas is
A) trypsinogen.
B) amylase.
C) carboxypeptidase.
D) lipase.
E) bile
A
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Which of these is considered a "gatekeeper" that regulates the passage of materials in or out of the cell?
A. Cilia B. Lysosome C. Flagellum D. Plasma membrane E. Cholesterol molecule
All the following compensate for a fall in blood pressure below normal except
a. increased cardiac output b. decreased total peripheral resistance c. increased heart rate d. venous vasoconstriction e. increased stroke volume
Which enzyme joins the newly synthesized DNA segments during DNA replication?
a) ligase b) transcriptase c) polymerase d) helicase
The events leading to skeletal muscle contraction are initiated by the neurotransmitter ________.
Fill in the blank(s) with the appropriate word(s).