Which of the following bacterial components are examples of virulent factor
a. pili
d. cell membrane
b. capsule
e. some enzymes
c. ribosome
f. Fimbraie
A. b, c, d, and f
B. a, b, e, and f
C. a, b, and f
D. a, b, d, and f
Ans: B. a, b, e, and f
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The bond in table salt (NaCl) is
a. polar. b. ionic. c. covalent. d. double. e. nonpolar
One advantage of a four-chambered heart is that it ____
a. prevents mixing of oxygenated and deoxygenated blood b. prevents deoxygenated blood from entering the heart c. allows for better flow of blood to the tissues d. prevents mixing of oxygenated and deoxygenated blood and allows tissues to be bypassed e. prevents mixing of oxygenated and deoxygenated blood and allows better flow of blood to the tissues
What is the function of the operculum?
A. to store urine until excreted B. to cleanse the blood of toxins C. to regulate buoyancy D. to detect changes in water pressure E. to pump water over the gills
All arthropods _____. 1. undergo complete metamorphose 2. have jointed appendages 3. molt 4. have segmented bodies 5. have an exoskeleton or cuticle
A) 1, 2, and 4 B) 3 and 5 C) 2, 3, 4, 5 D) 1, 4, 5