The second-messenger mechanism of hormone action operates by a. synthesizing more of the hormone than is actually needed b. binding to specific receptors and employing the services of g proteins and camp c. not responding to a feedback mechanism d. increasing the basal metabolic rate in the target organ

Which of the following is an advantage of using embryonic stem cells in medical research? a. the use of embryonic stem cells is much less expensive than the use of adult stem cells. o b. no living tissue is damaged when scientists use embryonic stem cells. o c. embryonic stem cells are able to differentiate into a wider range of cells than adult stem cells. d. there is no controversy surrounding the use of embryonic stem cells.