Which of the following hormones directly stimulates the development of male secondary sex characteristics?
What will be an ideal response?
testosterone
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A chemical characteristic of a cell or particle that causes an immune response is a(n) ____
a. allergy b. antibody c. antigen d. blood type e. Rh factor
The cell cycle is
Fill in the blank(s) with the appropriate word(s).
Vacuoles for ingesting food and regulating their water balance are characteristic of
A. sporozoans. B. spirochetes. C. trypanosomes. D. algae. E. ciliates.
The designation of magnesium ion as Mg2+ indicates:
A. an atom that has lost two electrons and is negatively charged. B. an atom that has two more neutrons than protons. C. an atom that has lost two electrons and is positively charged. D. an atom that has gained two protons and is positively charged. E. an atom that has gained two protons and is negatively charged.