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.
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
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.