Which of the following highly contagious viruses is a single-stranded ribonucleic acid (RNA) virus with a helical capsid and envelope and is transmitted by coming in contact with respiratory secretions?
a. Coxsackievirus A
b. Rhinovirus
c. Parvovirus
d. Measles
D
Measles is a single-stranded RNA genome with a helical capsid and envelope and is highly con-tagious. It is transmitted via respiratory secretions.
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Cells with a short life span that circulate in blood and tissues and are usually the first cells on the scene of a bacterial invasion are called:
a. monocytes. b. polymorphonuclear neutrophils. c. lymphocytes. d. macrophages.
Cytotoxic T cells primarily are responsible for
A. humoral immunity. B. cell-mediated immunity. C. anamnestic immunity. D. producing haptens.
Mushrooms are fungi belonging to the phylum ___________.
Fill in the blank(s) with the appropriate word(s).
A sarcomere shortens when _____
a. thick filaments shorten c. both thick and thin filaments shorten b. thin filaments shorten d. none of these