If sperm cells are not released by ejaculation,
A. they can be stored for weeks in the prostate.
B. they die and are absorbed into the body.
C. the man stops producing sperm.
D. prostate cancer will develop.
B. they die and are absorbed into the body.
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A goiter is caused by a deficiency in:
a. thyroxine only b. triiodothyronine only c. calcium d. iodine e. thyroxine and triiodothyronine
Spindles disappear during
A. prophase I. B. telophase II. C. anaphase II. D. metaphase I.
The centromere
A. is a region of DNA where sister chromatids associate. B. is a group of proteins that attach to the kinetochore. C. is only present when chromosomes are highly compacted. D. is a group of proteins that attach to the mitotic spindle. E. is not present on the chromosomes of the daughter cells until the S phase.
Refer to Figure 50-4. The peak in ________ around day 21 corresponds with __________
a. luteinizing hormone; ovulation b. follicle-stimulating hormone; the development of the follicle c. estrogen; breakdown of the endometrium d. progesterone; continuing to build up the endometrium e. estrogen; ovulation