Which plant specialization mutually benefits the young root and a fungus?
a. All of these choices
b. Root nodules
c. Mycorrhizae
d. Root hairs
e. None of these choices.
c
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Production of urine in the nephron begins with
a. filtration. b. tubular reabsorption. c. tubular secretion. d. tubular modification. e. active reabsorption.
To create a knockout mouse, after introducing to ES cells a DNA construct in which a specific gene is mutagenized by the insertion of a drug resistance marker, the cells
A) that have incorporated the transgene by homologous recombination grow in the presence of the drug and these are injected into a host blastocyst. B) that lack the transgene grow in the presence of the drug and these are injected into a host blastocyst. C) that have deleted the transgene grow in the presence of the drug and the nuclei are injected into a host blastocyst. D) that lack the transgene grow in the presence of the drug and the nuclei are used for nuclear transfer.
Mendel called crosses involving two traits ____________________ crosses. Fill in the blank(s) with the appropriate word(s)
Synthetic auxins are used commercially
A) to promote seed germination. B) to promote flowering in ornamental crops. C) to promote side branching to produce bushier crops. D) as a broadleaf weed killer.