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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Most of the carbon dioxide produced by humans is _____
A) converted to bicarbonate ions by an enzyme in red blood cells B) bound to hemoglobin C) transported in the erythrocytes as carbonic acid D) simply dissolved in the plasma E) bicarbonate ions bound to hemoglobin
Tamiflu is a common medication given for influenza treatment. It works by protecting and blocking sialic acid molecules on the surfaces of host cells and influenza virus envelopes as they leave the cell. Which statement reflects the mechanism of Tamiflu's action?
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?
A. Attenuation B. Catabolite repression C. Induction D. All of the choices are correct.
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