Testosterone functions inside a cell by _____
A) acting as a signal receptor that activates tyrosine kinases
B) binding with a receptor protein that enters the nucleus and activates specific genes
C) acting as a steroid signal receptor that activates ion channel proteins
D) coordinating a phosphorylation cascade that increases spermatogenesis
B
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The above map of ________ exemplifies the core-periphery nature of today's world system
A) gross national income per capita B) gross domestic product C) total national debt D) agricultural cover E) percent of workforce in the primary sector
A polar covalent bond would be most likely to form between
a. atoms with different electronegativities. b. cations and anions. c. atoms with ?+ and ?? charges. d. atoms with filled valence shells. e. atoms of the same element.
Which of the following is formed last in the transfer
of solar energy? a. H+ b. excited electrons c. ATP d. O2 e. NADPH
Which group contains mostly unicellular, eukaryotic organisms?
A) Animalia B) Fungi C) Plantae D) Protists E) Bacteria