In the human knee-jerk reflex of a seated individual, as the calf is raised from a vertical position to a horizontal position, the muscles of the quadriceps (on the front of the thighs) and the muscles of the hamstring (on the back side of the thighs
) are _____. A) both excited and contracting
B) both inhibited and relaxed
C) excited and inhibited, respectively
D) inhibited and excited, respectively
C
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Myosin is a motor protein involved in animal cell cytokinesis. It binds to ATP or ADP, causing the myosin to move with respect to actin. What is the effect of the interaction between myosin and actin?
A) Vesicles containing plasma membrane constituents are transported to the metaphase plate, where cytokinesis takes place. B) Excess cytoplasm is removed. C) The cleavage furrow deepens. D) Two new daughter nuclei form.
CVS cannot detect inborn errors of metabolism because
A) it does not sample amniotic fluid. B) it is done too early in the pregnancy. C) it is done too late in the pregnancy. D) such errors are not detectable until after birth.
Pedigrees are
a. used by geneticists to determine the sequence of an individual's genes. b. histories of families with regard to particular genetic traits. c. used only for dogs, cats, and horses. d. mutated alleles capable of causing genetic disorders. e. characteristics that are apparent in an individual.
The ___ of a muscle is on a stationary bone & the ___ of a muscle is on a bone that moves.
Fill in the blank(s) with the appropriate word(s).