The spindle apparatus is made of
a. Golgi bodies.
b. nucleoprotein.
c. endoplasmic reticulum.
d. microtubules.
e. chromatids.
d
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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.
During which phase of meiosis will the chromosomes appear as closely associated packets of four chromatids?
a. anaphase I b. telophase II c. anaphase II d. prophase I e. metaphase II
The only animals that lack tissues are
A) sponges. B) cnidarians. C) nematodes. D) chytrids. E) chordates.
Helpful bacteria that produce lactic acid would be a defense found in which part of the body?
A) urinary tract B) skin C) respiratory tract D) female reproductive tract E) stomach