Cephalization refers to ____
a. a type of symmetry
b. neurons concentrated at the posterior end of an animal
c. a net of neural cells
d. neurons dispersed throughout the body
e. neurons concentrated at the anterior end of an animal
ANSWER: e
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The bicuspid (mitral) valve
A. is the location of the pacemaker cells of a normal heart. B. prevents blood flow from the right ventricle to the right atrium. C. prevents blood flow from the left ventricle to the left atrium. D. prevents blood flow from the pulmonary artery to the right ventricle. E. prevents blood flow from the aorta to the left ventricle.
Which of the following is a harmless bacterium, in which mutated strains may cause toxic shock syndrome, inhabits your skin?
A) Aeromonas hydrophila B) Streptococcus pyogenes C) Clostridium tetani D) Vibrio cholerae E) Staphylococcus aureus
Which of the following is a member of the Flaviviridae that is NOT an arbovirus?
A) eastern equine encephalitis virus B) dengue virus C) hepatitis C virus D) hepatitis E virus E) West Nile virus
A primary immune response is the ________
A) production of primary-type antibodies in the first day of exposure to a microorganism
B) immune response elicited by the second exposure of lymphocytes to a particular antigen
C) immune response elicited by the first exposure of lymphocytes to a particular antigen
D) immune response elicited by the first exposure of memory cells to a particular antigen