Proteins that mediate or catalyze reactions in which the covalent bonding of the reactant molecules changes are called substrates
Indicate whether the statement is true or false.
FALSE
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The female homologue of the penis is the __________.
Fill in the blank(s) with the appropriate word(s).
The respiratory system
a. obtains O2 from and eliminates CO2 to the internal environment b. includes the heart and lungs c. helps regulate the pH of the internal environment by removing acid-forming CO2 from the blood d. performs all of the functions listed above e. obtains O2 from and eliminates CO2 to the internal environment and helps regulate the pH of the internal environment by removing acid-forming CO2 from the blood
A major difference between cardiac muscle cells and the cells in the cardiac conducting system is that the contractile cells do not undergo spontaneous depolarization
Indicate whether the statement is true or false.
Defensins and lysosomes are both part of ________ immunity and function as ___________
A. adaptive; physical barriers to pathogen entry B. adaptive; attackers of pathogenic cells C. innate; physical barriers to pathogen entry D. innate; attackers of pathogenic cells