Zebrafish are a good model organism for vertebrate growth and development because
a. they grow larger than many other fish
b. they are at the top of the food chain
c. they can regenerate tissues that become damaged such as fins
d. they have more offspring than many fish
e. they undergo a different form of mitosis than most organisms
C
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An action potential begins in a neuron's trigger zone, the part of the axon adjacent to the cell body. When a neuron is at rest, this region's gated channels for sodium and potassium are ____
a. closed b. both open c. both open but inactive d. open only at gated sodium channels e. open only at gated potassium channels
Which statement is not true?
1.Carbon dioxide is more soluble in fluid than in oxygen. 2.Carbon dioxide diffuses more rapidly across the respiratory surface than oxygen does. 3.The major muscle involved in breathing is the diaphragm. 4.Oxygen is carried primarily by blood plasma. 5.Carbon dioxide is carried by the blood plasma.
How are chromosomes maintained in the equatorial plane during mitotic metaphase?
a) by binding to the metaphase plate b) by a tug-of-war between balanced pulling forces exerted by chromosomal spindle fibers from opposite poles c) by a tug-of-war between balanced pulling forces exerted by polar spindle fibers from opposite poles d) by a tug-of-war between balanced pulling forces exerted by astral spindle fibers from opposite poles