In the human male, sperm cells are produced in the ________ and are supported by the ________.
A. vas deferens; endometrium
B. seminiferous tubules; Sertoli cells
C. interstitial tissue; cervix
D. urethra; uterus
E. seminal vesicles; oviduct
Answer: B
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What is true about the operation of gills in water? Check all that apply.
_____ Water can support delicate gill structures. _____ Most bony fish actively pump water over their gills. _____ Keeping membranes moist does not require a separate mechanism. _____ Water carries more oxygen than air, so gills must be more efficient than lungs. _____ Gills have evolved many times. _____ Gills take different forms in different animals.
A prokaryote’s cell shape is reinforced by
a. phospholipids. b. DNA. c. protein filaments. d. transport proteins. e. ribosomes
In horses, there are four alleles at the A locus. Arranged in dominance sequence they are:A
(wild), ab (bay), ac (brown), ad (black) If you bred several bay mares whose sires were brown to a brown stallion whose sire was black, what are the genotypes of the parents; what type of offspring would be produced; and in what proportion? What will be an ideal response?
Which of the following would be an example of an organism that provides direct benefit by consumptive use value?
A. rice B. armadillos C. rosy periwinkle D. trees E. wheat