A pair of cells that surrounds each stoma and controls its opening and closing are the
A. companion cells.
B. guard cells.
C. sieve tube cells.
D. pith cells.
E. vascular cells.
B. guard cells.
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Select the example of traditional breeding.
A) Mating dogs with other dogs based on traits such as size, fur color, and temperament B) Placing human genes into bacteria for production of drugs C) Placing genes into wheat to aid in disease resistance D) Adding genes to tomatoes to help them taste better
During which stages of cellular respiration is CO2 released?
a. glycolysis b. pyruvate oxidation c. citric acid cycle d. electron transport system e. both pyruvate oxidation and citric acid cycle
Water that moves through nonliving regions of root, such as air spaces in root tissue, is following the
a. symplastic pathway. b. transmembrane and symplastic pathways. c. transmembrane pathway. d. apoplastic, transmembrane, and symplastic pathways. e. apoplastic pathway.
In a chloroplast, the stroma is
A) a pore in the outer membrane. B) a stack of thylakoids. C) the region between in the inner and outer membranes. D) a connection between the grana. E) a gel-like matrix between the inner chloroplast membrane and the thylakoid membrane.