The erection of the clitoris is possible because its internal structure contains _____.

A. urethra
B. corpora cavernosa
C. seminiferous tubules
D. smegma


B. corpora cavernosa

Biology & Microbiology

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The transduction pathway that activates systemic acquired resistance in plants is initially signaled by _____

A) antisense RNA B) Pfr phytochrome C) salicylic acid D) abscisic acid E) red, but not far-red, light

Biology & Microbiology

Where does a dendritic cell present antigen to naive T cells?

a. thymus b. blood c. bone marrow d. lymph node or spleen e. interstitial fluid

Biology & Microbiology

What type of plants are naturally selected when grazing animals eat the tops of plants?

A) plants that don't reproduce via flowers B) plants that grow from the tip of the plant C) plants that grow from the base of the plant D) plants that can grow only after a fire burns the top of the plant

Biology & Microbiology

Emery had no freckles. His wife, Marguerite, was clearly freckled but known to be heterozygous for the gene. Predict the chance that any one of their children will have freckles

A) 75% B) 25% C) 100% D) 50%

Biology & Microbiology