In the accompanying figure, the cell layer that contains xylem is labeled as:
a. 1
b. 2
c. 3
d. 4
e. 5
a
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What type of allele is often detected as a distortion in segregation ratios, where one class of expected progeny is missing?
A) dominant negative allele B) temperature-sensitive allele C) lethal allele D) partial dominance E) incomplete penetrance
Plants require a lot of water for transpiration, metabolism, and photosynthesis. How is water used in photosynthesis?
A. as a substrate for ATP synthase B. to combine with NADP+ to form NADPH C. to combine with ADP forming ATP D. as an electron donor E. as an electron acceptor
In diffusion, molecules move towards areas of
a. lower concentration b. higher concentration c. the same concentration
You have learned that flowering plants have a dominant sporophyte and mosses have a dominant gametophyte. Having two unequal life cycle stages is called heteromorphy. Certain algae have a homomorphous relationship between their two life cycle stages. Homomorphy likely means
A. the organism does not undergo alternation of generations. B. the two life cycle stages are equal. C. the organism is always a sporophyte. D. the organism is always a gametophyte.