Xylem sap and soil water differ in _________ because of ___________
A. solute composition; selective uptake by the
endodermis
B. solute composition; selective uptake by
mycorrhizae
C. solute composition; selective uptake by the
epidermis
D. pH; H+ exclusion by the endodermis
A
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Which of the following statements is false?
A) All organisms consist of one or more cells. B) All cells arise from preexisting cells. C) The cell is the basic unit of structure for all organisms. D) All cells have a membrane-bound nucleus. E) Cells come in a wide variety of sizes and shapes.
The wrapping around an object movement that is performed by the hand is called
a. prehensile. b. opposable. c. coordinated. d. circumduction. e. tubing.
The red-cockaded woodpecker that builds nests mainly in one type of tree that is of a certain age is a(n)
____________________ species. Fill in the blank(s) with the appropriate word(s).
What is the difference in the bonding between alpha-helix and beta sheets?
A. Sulfur bridges allow the spring like turns in alpha helices and van der Waals dispersion allows the folds in beta sheets. B. Hydrogen bonding occurs between the amides of adjacent chains in the sheets instead of between the amides in different parts of the helices. C. Hydrogen bonding always occurs in the alpha helices but only occurs in parallel beta sheets. D. Hydrogen bonding between the amides only occurs in one of these two types of secondary structures.