Which of the following is not a function of the placenta?
a. exchanges blood between mother and fetus
b. secretes hormones to maintain pregnancy
c. provides oxygen for the fetus
d. eliminates wastes from the fetus
e. provides nutrients for the fetus
A
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Tannins are chemicals that help plants repel invaders by
A. over-stimulating the predator. B. sedating the predator. C. binding to proteins and thereby disrupting the predator's digestion. D. injuring the external covering of the predator's body. E. causing the predator to grow so rapidly that it dies.
The strand of DNA for a particular gene that is copied by the RNA polymerase to form mRNA is called the ________ strand.
A. copy B. transcription C. template D. leading
A common second messenger molecule is
a. a steroid compound. b. cyclic AMP. c. ADP. d. prostaglandin. e. intermedin.
Which of the following statements about exocrine glands is NOT accurate?
a. Products may be secreted onto a free surface. b. Secretions reach their destination by way of tubes and ducts. c. Hormones are produced by exocrines. d. They are derived from epithelium. e. Saliva is an exocrine secretion.