When sperm enter the epididymis, they ________

A) come from the vas deferens B) are mature
C) are ready to fertilize an egg D) are incapable of moving on their own


Answer: D

Biology & Microbiology

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Cystic fibrosis is most often caused by the CFTR?F508 mutation. This mutation:

A. reduces the function of a chloride ion channel. B. increases ATP binding to chloride. C. is autosomal dominant. D. causes symptoms in carriers.

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Skeletal muscle fibers are composed of ____

a. cells b. nuclei c. myofibrils d. epithelial tissue e. bursa

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A sigmoidoscopy is used to screen for ____________________. Fill in the blank(s) with the appropriate word(s)

Biology & Microbiology

Morgan's student Sturtevant demonstrated that the recombination frequencies between a series of linked genes is additive. Examine the following recombination data from Sturtevant, and determine the proper order of the genes on the Drosophila X chromosome. Assume y is in the 0.0 position.Gene 1                Gene 2               Recombination frequencyyellow(y)            vermilion(y)           0.322vermilion           miniature(m)           0.030white(w)            vermiliom                0.297yellow                white                      0.010white                 miniature                0.337 

A. y m v w B. y w m v C. y w v m D. y m w v

Biology & Microbiology