The movement of actin and myosin fibers in a muscle contraction contains all of the following steps EXCEPT
A. the myosin head attaches to the actin filament.
B. the globular myosin head detaches from the actin filament.
C. myosin rolls up from one end, forming a ball.
D. the myosin head returns to its original conformation.
E. the myosin filament advances relative to the actin filament.
C. myosin rolls up from one end, forming a ball.
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If a coelom had been present in a species but was then lost over time, which function would you hypothesize could be most affected?
A. nervous. B. muscular. C. reproductive. D. digestive.
If two molecules are mirror images of each other, the two molecules may be
A. cis isomers B. trans isomers C. Enantiomers D. Structural isomers
Phylogenetic trees are built using:
a) similarities in the physical structure of organisms. b) similarities in the embryological development of organisms. c) similarities in the DNA sequences of organisms. d) tissue samples. e) a), b), and c) are all correct.
ACTH stands for adrenocorticotropic hormone, but it is produced in the anterior pituitary. What is the basis of this name?
A. It stimulates appetite by acting on the cerebral cortex. B. It stimulates the adrenal cortex. C. It is expressed most highly in tropical climates. D. It signals to the kidneys to reabsorb water.