The sliding filaments that move relative to each other during muscle contraction are ________.
Fill in the blank(s) with the appropriate word(s).
Answer: actin and myosin filaments
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Cnidarians share a common body plan that takes two forms. The free-floating form is called a ____ , whereas the sessile form is called a ____
Fill in the blank with the appropriate word.
Which one of the following is a characteristic of open circulatory systems but NOT closed circulatory systems?
A) a heart B) a vascular system C) blood D) open-ended blood vessels
After drinking alcoholic beverages, increased urine excretion is the result of _____
A) increased aldosterone production B) increased blood pressure C) inhibited secretion of antidiuretic hormone (ADH) D) increased reabsorption of water in the proximal tubule
In a certain breed of chicken, an incompletely dominant gene controls color. The homozygous black (BB), when crossed with the homozygous splashed-white (bb), produces an intermediate gray color pattern referred to as blue. A second gene controls the shape of the comb. The dominant allele (R) produces rose, whereas the recessive allele (r) produces single. A cross between a true-breeding black with a single comb and a true-breeding splashed-white with a rose comb will produce a total of _______ different phenotypes in the F2 generation.
Fill in the blank(s) with the appropriate word(s).