The most effective means of preventing influenza is
A) annual vaccination.
B) isolation of carriers.
C) vector control.
D) pasteurization of milk.
E) administration of amantadine.
A
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A mouse senses that a cat is nearby, and its body begins to produce epinephrine as part of the fight-or-flight response. Which of the mouse's glands secretes epinephrine? Select all correct choices
A. the pituitary gland B. the thyroid gland C. the parathyroid glands D. the adrenal glands E. the pineal gland
Which of the following is true of chemotherapeutic agents?
A. They create broken chromosomes or stalled replication forks. B. The cytotoxic effect of these DNA damaging agents requires the cell to be actively dividing. C. These agents are toxic to cancer cells because they are actively dividing to form a tumor. D. The adverse side effects of chemotherapeutics are strongest in cell types that divide rapidly (hair, blood, and the gastrointestinal tract). E. All of these statements are true.
Pili may do four of the following. Which is the exception?
a. They help cells attach to surfaces. b. They function in conjugation. c. They extend from the cell surface. d. They can be transferred between cells. e. They function in cell locomotion.
There are certain conditions that must be met for infection to occur. Three of the following assumptions are true for infection. Identify the false assumption.
A) The microorganisms must be opportunistic. B) The microorganisms must penetrate the host defenses. C) The microorganisms must enter the tissues. D) The microorganisms must multiply.