left untreated, syphilis infections go through four stages. The first stage is a sore called a chancre. The signs of the second stage are
A. some nerve damage, loss of some teeth, and perhaps a dimming of color vision.
B. very few, with many victims having no symptoms.
C. rash, sore throat, and sores in the mouth
D. persistence of the chancre and bleeding at the chancre site.
E. a yellowish-white discharge from the urethra.
C. rash, sore throat, and sores in the mouth
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Echinoderms are characterized by bilateral symmetry in adults, a water vascular system, tube feet, and spiny skin. Indicate whether the statement is true or false
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A. Tamiflu interferes with the metabolic properties of the virus. B. Tamiflu interferes with the release of the budding viruses from the infected host cells. C. Tamiflu interferes with the replication of +ssRNA from the -ssRNA genome of the flu virus. D. Tamiflu blocks protein synthesis of the viral genome.
Which of the following is not a regulatory mechanism used to control the lactose operon in Escherichia coli?
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