Select the best response to the question.
Which of the following is characteristic of a virus?
A) Cannot exist outside of a living host.
B) Does not contain a nucleus.
C) Uses the host cell's reproductive system.
D)Has both beneficial and harmful forms.
C
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Which of the following respiratory surface properties enhances the diffusion of respiratory gases?
a. large surface area b. thick epithelial layer c. cool temperatures d. the presence of active transport pumps e. presence of carbon dioxide
Infection of the urinary bladder is called ________.
A. PID B. vaginitis C. urethritis D. pyelonephritis E. cystitis
The chromatids detach from one another during __________________.
A. anaphase B. metaphase C. interphase D. prophase E. telophase
These two molecules are structural isomers. What is the difference between them?
 A) the number of carbon atoms B) the number of hydrogen atoms C) the location of a double-bonded oxygen atom D) Only one of them has a double bond between carbon atoms.