Four of the five structures listed below are
haploid. Select the EXCEPTION.
a. spores
b. sporophytes
c. egg
d. sperm
e. gametophyte
B
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A scientist is studying endosymbiosis in cells. This means she is investigating
A. how mitochondria and chloroplasts were derived from eukaryotic cells. B. how mitochondria and chloroplasts were derived from prokaryotic cells. C. how mitochondria and chloroplasts evolved into eukaryotic cells. D. how mitochondria and chloroplasts evolved into prokaryotic cells.
Secondary messengers are molecules that bind with signal receptors on the plasma membrane of a target cell
1.True 2.False
When the ciliary muscle contracts,
a. close objects become focused on the retina. b. a right-side-up and nonreversed pattern of light rays stimulate the retina. c. the lens flattens, and the focal point moves farther back in the eye. d. the pupil enlarges. e. all of these occur.
The condition of having no sperm in the semen is called ____________________. Fill in the blank(s) with the appropriate word(s)