The role of cAMP when it acts as an intracellular mediator in cells is to
A. bind to and activate protein kinase.
B. activate genes in the nucleus to produce mRNA.
C. directly activate structural enzymes in the cytoplasm of the target cell.
D. catalyze a cascade reaction that ultimately activates genes on the DNA.
E. control levels of calcium in the cell.
A
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Why is it important to precisely regulate the pH of blood or other body fluids?
A) Blood functions as an excellent solvent. B) Blood and other body fluids have a very high heat capacity. C) Dehydration synthesis of large molecules occurs. D) Hydrogen ions are extremely reactive. E) Some organic molecules have polar covalent bonds.
The foramen ovale in the fetal heart is located in the
A) right atrium. B) left atrium. C) right ventricle. D) left ventricle. E) interatrial septum.
All of these muscles, except one, have their origin on the scapula. Select the exception
A. Pectoralis major B. Coracobrachialis C. Triceps brachii D. Subscapularis E. Infraspinatus
Adrenocorticotropic hormone
a. is a tropic hormone secreted by the adrenal cortex b. stimulates the production of androgens by the testes c. is controlled in part by CRH from the hypothalamus d. has characteristics a and b e. has characteristics b and c