Which substance, by providing strength, allows sclerenchyma cells to provide support and play a role analogous to that of an animal's skeleton?
A) lignin
B) sucrose
C) starch
D) chlorophyll
Answer: A
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The total phenotype variance (VP) is
A) the sum of genetic variance (VG) and environmental variance (VE). B) the difference between VG and VE. C) independent of VG. D) independent of VE. E) always constant.
Which of the following statements is NOT true?
a. All chordates have a notochord. b. All chordates have pharyngeal pouches or gill slits. c. All chordates have a dorsal nerve cord. d. All chordates are vertebrates. e. Chordates are deuterostomes.
Which cross-section of a tree demonstrates
significant system acquired resistance? a. A b. B c. C d. None of these e. All of these
Which of the following types of cell cleavage is found most often for deuterostomes?
a. radial, indeterminate cleavage b. spiral, determinate cleavage c. radial, determinate cleavage d. spiral, indeterminate cleavage