Epinephrine activates the cyclic AMP pathway in liver cells. In this example, epinephrine is a ____________ and cAMP is a _____________
A. ligand, receptor
B. first messenger, hydrophobic hormone
C. second messenger, ion channel
D. first messenger, second messenger
E. enzyme, second messenger
D
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Which structure in the figure produces a protein that helps protect the skin and underlying tissues from heat, microbes and chemicals?
a) A b) B c) C d) D e) E
What type of cell makes up almost half the volume of blood?
A) erythrocyte B) leukocyte C) platelet D) monocyte E) phagocyte
The most common vector that is used to transport DNA into a cell for gene therapy is a(an)
A. bacteria. B. cancer cell. C. allergen. D. virus.
Which of the following is NOT a characteristic of the cytosol?
a) primarily consists of water b) cation of electron transport chain carrier proteins c) site of many important chemical reactions d) often contains aggregates of triglycerides that form lipid droplets e) contains the enzymes of glycolysis