Refer to the paragraph on dark-eyed junco birds. The UCSD campus male junco population tails were, on average, 36% white, whereas the tails of males from nearby mountain populations averaged 40—45% white
A) mutations in the UCSD population
B) sexual selection
C) gene flow between populations
D) a genetic bottleneck
E) a founder effect
Answer: E
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The existence of extensive scalded skin syndrome does not indicate that Staphylococcus is growing in all the affected areas. Why not?
A. This condition is caused by an exotoxin produced by certain strains of this microbe, and NOT directly by the microbe itself. B. This condition is caused by an endotoxin produced by certain strains of this microbe, and NOT directly by the microbe itself. C. This condition isn't caused by Staphylococcus at all. D. This microbe doesn't grow in the skin-but the toxins it releases are transported by the blood vessels into the skin, where it achieves the observed effect.
During the tertiary stage of syphilis, tumors called ________ develop in the liver, skin, bone, and cartilage.
A. ulcers B. nodules C. chancres D. gummas
________ store the information necessary to produce proteins
A) Lysosomes B) Genes C) Ribosomes D) Carbohydrates
The primary portal of entry for fungal infections is
A) Digestive system B) Nervous system C) Respiratory tract D) Through skin E) Urinary tract