A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates
A) the blending model of genetics.
B) true-breeding.
C) dominance.
D) a dihybrid cross.
E) the mistakes made by Mendel.
Ans: C) dominance.
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A mutualistic symbiosis where fungal hyphae penetrate plant root cells is called a(n) ____
a. ectomycorrhiza b. lichen c. arbuscule d. endomycorrhiza e. haustorium
Do all of the carbon atoms in glucose participate in the formation of the ring?
a. yes b. no
Typically, methylation of nucleosome N-terminal tails leads to __________
A) removal of the protein components of the chromatin from the DNA B) relaxed packaging of the chromatin and increased transcription C) tighter packaging of the chromatin and reduced transcription D) increased amounts of euchromatin relative to heterochromatin E) activation of topoisomerase
Some flowers have distinctive patterns that only reflect ultraviolet light and therefore are invisible to humans. Which statement about such markings is not correct?
A. Flowers with ultraviolet patterns usually appear yellow or orange to humans. B. Carotenoid pigments are responsible for the ultraviolet patterns. C. The ultraviolet patterns are highly visible and attractive to bees. D. The ultraviolet patterns repel birds and bats from the flowers. E. The ultraviolet patterns often form a conspicuous central bull's eye or identify the best landing sites.