Four of the five structures listed below are

haploid. Select the EXCEPTION.



a. spores
b. sporophytes
c. egg
d. sperm
e. gametophyte


B

Biology & Microbiology

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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.

Biology & Microbiology

Secondary messengers are molecules that bind with signal receptors on the plasma membrane of a target cell

1.True 2.False

Biology & Microbiology

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.

Biology & Microbiology

The condition of having no sperm in the semen is called ____________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology