Stomata ____
a. are found in the root cells
b. may be found scattered anywhere throughout the plant
c. allow the movement of gases into and out of plants
d. are more numerous on the top surface of a leaf
e. remain open at all times
ANSWER: c
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Which of the following describes a feature of amino acid structure?
A. The central or ?-carbon of the amino acid is bonded to three other groups. B. Each amino acid will have either an ?-amino group or an ?-carboxyl group. C. The R groups of amino acids will vary in structure, size, electrical charge, and hydrophobicity. D. The ?-amino and ?-carboxyl groups are frequently modified by phosphorylation. E. In most cases, the central or ?-carbon of the amino acid is bonded directly to a hydroxyl group.
__________ are heterotrophs that grow as a mesh of absorptive filaments. Some are plant pathogens. Fill in the blank(s) with the appropriate word(s)
The primary cause of desertification in the world today is
a. increased salinity resulting from irrigation practices. b. overgrazing of marginal lands. c. clearing and degradation of tropical forests. d. herbicide and fertilizer runoff. e. use of water for industry.
What is the best explanation of why we have identified only a small fraction of fungi species?
A) Most fungi species grow underground and in inaccessible places. B) Fungi species lack chlorophyll and are transparent. C) Most fungi species are unicellular and microscopic. D) Fungi species have extremely short life spans and are seldom found alive.