Which of the following is a true statement about cycads?
a. Cycads can be pollinated by beetles.
b. Cycads are the most common gymnosperm.
c. Cycad leaves are a source of ephedrine.
d. Cycads have only one surviving species.
a. Cycads can be pollinated by beetles.
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The two major categories of extracellular signaling molecules that bind to cell surface receptors are ____
a. peptide hormones and steroid hormones b. steroid hormones and neurotransmitters c. neurotransmitters and vitamins d. growth hormones and vitamins e. peptide hormones and neurotransmitters
What is polyploidy?
a. less than the correct number of chromosome sets b. an extra chromosome 21 c. more than the correct number of chromosome sets d. a missing sex chromosome
The substance on which an enzyme acts is called the:a
substrate. b. product. c. ATP. d. free energy. e. cofactor.
What is the principal driving force for movement of water into and through the plant shoot?
a. upward pressure as sugar is forced into the roots b. pumping by the xylem cells c. passive transport d. transpirational pull