The _____ is a long tube, about 6 meters or 20 feet in length, coiled into a small crescent-shaped region on the top and side of the testis.
A. epididymis
B. urethra
C. seminiferous tubule
D. seminal vesicle
A. epididymis
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An important diagnostic sign of measles is
A. Koplik's spots. B. giant cells. C. fever. D. swollen lymph nodes.
Microfilaments are assembled from the protein ____
a. keratin b. myosin c. laminin d. actin e. tubulin
The density of Douglas firs in an old-growth forest is estimated by counting the Douglas firs in four sample plots of 1 hectare each. The number of fir trees in the plots is 10, 12, 7, and 11, respectively. What is the estimated density of firs in the forest?
A) 2.5 trees per hectare B) 5 trees per hectare C) 10 trees per hectare D) 20 trees per hectare E) 25 trees per hectare
Which of the following is NOT a physiological change related to photoperiodism?
A. some flowering B. root branching C. breaking bud dormancy D. seed germination E. onset of senescence