Development of the pancreas in an embryo into a dual gland that has both exocrine and endocrine functions begins when
A) insulin is produced and bathes stem cells.
B) a transcription factor stimulates progenitor cells to give rise to exocrine or endocrine cells.
C) a globin gene duplicates and gives rise to alpha and beta globin genes.
D) progenitor cells become stem cells.
B) a transcription factor stimulates progenitor cells to give rise to exocrine or endocrine cells.
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Which cells are located in the brain and spinal cord of vertebrates?
a. interneurons b. motor neurons c. afferent neurons d. efferent neurons e. afferent and efferent neurons
Different responses of the same hormone, or antiestrogen agent, is due to
a. differences in luciferase activity. b. receptor sites for estrogen. c. differences in gene amplification. d. cyclic AMP levels. e. receptors in the hypothalamus.
Plants are _____. (choose all that apply)
a. organisms e. consumers b. a domain f. producers c. a species g. hypotheses d. eukaryotes h. traits
High temperatures can alter the three-dimensional shape of a protein. This process is called denaturing. How might this affect the activity of an enzyme?
What will be an ideal response?