A muscle can exert force while remaining the same length (e.g., When you lift a heavy bucket of cattle feed). This is known as:
A. isometric contraction.
B. geometric contraction.
C. isometric relaxation.
D. shortening contraction.
A
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The respiratory centers that control ventilation of the lungs in mammals are located in the
A. brainstem. B. hypothalamus. C. cerebral cortex. D. bronchi. E. neck.
Which is not true of a prokaryote cell?
a. it has a nucleus and membrane-bound organelles. b. it lacks membrane-bound organelles. c. it is always within a cell wall. d. it is always single cellular. e. it lacks chromosomes.
A buildup of H2CO3 in the blood will lead to
a. alkalosis. b. calcium buildup. c. acidosis. d. hydroxide ion increase. e. HCO3 ? increase.
Which of the following is the most common type of alternative splicing in animals and involves making mRNA molecules that lack a complete exon?
A) intron retention B) mutually exclusive exons C) alternative splice site D) alternative promoters E) cassette exons