According to the cohesion-tension mechanism of water transport, which of the following DOES NOT
contribute to the flow of the xylem sap?
a. hydrogen bonds between water molecules
b. adhesion of water molecules to the xylem vessel walls
c. evaporation of water from the leaves
d. water potential in leaf cells below that of the leaf xylem
e. root pressure
E
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Purple phototrophic bacteria that use bacteriochlorophyll a are oxygenic
Indicate whether the statement is true or false.
Genetic drift affects
a. allelic frequencies only b. genotypic frequencies only c. phenotypic frequencies only d. allelic, genotypic, and phenotypic frequencies
In this representation of transcription, strand #
____ is ____ because it ____.
a. 2; RNA; is double-stranded b. 3; RNA; contains uracil c. 2; RNA; contains thymine d. 2; RNA; has no uracil e. 3; DNA; contains adenine
3-phosphoglycerate is to C3 plants as ________ is to C4 plants
Fill in the blank with correct word.