Insulin is produced by the:a
beta cells of the islets of Langerhans.
b. alpha cells of the islets of Langerhans.
c. cortical cells of the adrenal gland.
d. neurons in the hypothalamus.
e. lobules of the liver.
a
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If molecular techniques predict the phylogeny shown here, which of the following shows the expected order of appearance of species in the fossil record from earliest appearing to most recently appearing?
A. chara, liverworts, hornworts, lycophytes B. chara, lycophytes, liverworts, hornworts C. lycophytes, hornworts, liverworts, chara D. lycophytes, liverworts, hornworts, chara E. hornworts, chara, lycophytes, liverworts
Steroid hormones are derived from
a. free fatty acids. b. cortisol. c. tyrosine. d. cholesterol. e. alanine.
Which of the following happens when a cell divides?
A) It becomes more difficult for the cell to get enough oxygen and nutrients. B) The cell's volume increases. C) Each daughter cell receives its own copy of the parent cell's DNA. D) It becomes more difficult for the cell to get rid of wastes.
Initial treatment for tetanus in an unimmunized person with a puncture wound is
A) tetanus toxoid. B) tetanus immune globulin. C) penicillin. D) none; no action is necessary. E) debridement.