Testosterone is made in the testes, where it stimulates sperm development. Additionally, testosterone is carried in the blood throughout the body, stimulating the growth of facial hair and muscles. Therefore, testosterone is
A) an endocrine hormone.
B) both a local and an endocrine hormone.
C) a local hormone.
D) both a neurotransmitter and an endocrine hormone.
E) a neurotransmitter.
B
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Reductive dechlorination is a process in which
A) the number of chlorine atoms present is reduced by oxygenase enzymes. B) chlorinated organics are used as terminal electron acceptors in anaerobic respiration. C) carbon dioxide is the final end product. D) xenobiotics are cometabolized with other reductive reactions.
Collectively, what did the work of Charles Darwin, Francis Darwin, and Fritz Went demonstrate about phototropism in plants? Select all correct choices
A. A chemical signal is produced in shoot tips in response to light. B. A chemical signal is produced in shoot stems in response to light. C. Cells exposed to a chemical signal produced by light will grow (elongate). D. Cells exposed to a chemical signal produced by light will not grow (elongate).
The natural habitat of a pathogen is referred to as its
A. home. B. primary inhabitance. C. infectious site. D. reservoir.
Transcription starts when RNA polymerase binds to the
a. transcription unit. b. coding strand. c. promoter. d. transcription bubble. e. nontemplate strand.