Which of the following is not a virulence factor of Bordetella pertussis?
A. M protein
B. Tracheal cytotoxin
C. Pertussis toxin
D. Filamentous hemagglutinin
E. Endotoxin
Answer: A
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The receptors on T cells and B cells bind to _____
A) antibodies B) antigens C) natural killer cells D) double-stranded RNA E) immunoglobulins
Some restriction endonucleases cut the DNA in such a way that short, single stranded regions are
created. We call these regions
a. hydrogen-bonding ends b. sticky ends c. tacky ends d. blunt ends e. jagged ends
Which structure below is unique to organisms that harness solar energy to make sugar?
a. endoplasmic reticulum b. chloroplast c. plasma membrane d. chromosome e. nuclear envelope
When the female silkworm moth is ready to mate, she:
a. finds males by following the chemical signals they emit. b. releases a potent chemical into the air. c. creates a series of sounds recognizable by the male silkworm moth. d. lifts her wings to reveal the mating pattern underneath. e. performs a nuptial dance.