Prolactin stimulates mammary gland growth and development in mammals and regulates salt and water balance in freshwater fish Many scientists think that this wide range of functions indicates that prolactin _____
A) is a nonspecific hormone
B) has a unique mechanism for eliciting its effects
C) is an evolutionarily conserved hormone
D) is derived from two separate sources
E) interacts with many different receptor molecules
Answer: C
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Which characteristic of antibodies is responsible for some autoimmune disorders?
a. affinity b. avidity c. cross reactivity d. complement fixation
A group that comprises an ancestor in which a derived trait evolved and all of its descendants is called:
a. a cladogram. b. a clade. c. a monophyletic group. d. a sister group. e. a polyphyletic group.
Asexually produced daughter cells are
a. identical to each other. b. identical to the parental cell. c. different from the parental cell. d. different from each other. e. identical to each other and to the parental cell.
Which of the following pairs of terms best describes the concept of membrane potential?
a) diffusion / facilitated diffusion b) concentration gradient / electrical gradient c) passive processes / active processes d) low concentration / high concentration e) selective permeability / osmosis