Which of the following sequences describes sexual reproduction in the fungal life cycle?
A) Haploid gametes divide by meiosis to produce a diploid zygote, which grows by mitosis to produce diploid mycelia.
B) The diploid zygote divides by meiosis to form haploid spores, which produce haploid mycelia through mitosis.
C) Free-swimming gametes fuse to form a diploid zygote, which grows by mitosis.
D) Diploid spores divide by meiosis to form haploid gametes, which join to form mycelia.
E) The haploid zygote divides by meiosis to form haploid spores.
B
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In male White-Crowned Sparrows, the sensitive period for song learning is:
A. the time during which they produce their subsong—between 50 days after hatching and about 250 days after hatching. B. the time between about 250 and 300 days after hatching, when they are producing an imperfect version of their father's song. C. about 10–50 days after hatching, when they must hear adult male song if they are later to be able to sing a proper adult male song of their own. D. the time during which, if they are presented with a live tutor of a closely related species, they can learn the other species' song instead of their own. E. the time during which, if they are presented with tapes of their own species' song and the song of a closely related species, they can learn the songs of both species.
Which of the following is true of water?
a. The oxygen end is slightly electropositive. b. Hydrogen bonds hold water molecules together. c. Water covers about one-half of the earth’s surface. d. It participates in hydrophobic interactions with polar molecules. e. Its solvent properties are greatest with nonpolar molecules.
In a certain variety of plants, a cross between a redflowered
plant and a white-flowered plant produced an all-red flower F1. In the F2 there were 140 red, 50 cream, and 65 white. (a) Offer an explanation for this F2 ratio. (b) What ratio would be produced in a testcross of the F1 hybrid? (c) What ratio would be produced if all the white F2 plants were crossed among themselves? What will be an ideal response?
Which of the following is a key component of the cytoskeleton?
a. centrosome b. microtubules c. DNA d. ribosomes e. endoplasmic reticulum