Zonation on a rocky intertidal zone refers to the distribution of different kinds of rocks from one area to the next
Indicate whether the statement is true or false
F
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Those echinoderms with a globular or flattened test are of the class:
a. Holothuroidea. b. Asteroidea. c. Ophiuroidea. d. Echinoidea. e. Crinoidea.
When a cell releases chemicals that act as signals into the extracellular fluid to affect cells, this is an
example of
a. autocrine regulation. b. endocrine regulation. c. paracrine regulation. d. systemic regulation. e. exocrine regulation.
Which of the following does not apply to the technique known as gel electrophoresis?
(A) The DNA is pulled to the positive end of the gel box (B) The agarose gel provides for a porous matrix (C) The buffer solution helps supply ions needed to conduct an electric current (D) The larger fragments move further down the gel than the smaller ones due to their heavier weight
The purpose of the pulmonary circuit is to ________ .
a. deliver blood to the hepatic portal system b. send de-oxygenated blood to the heart c. circulate oxygenated blood to the tissues d. oxygenate blood received from the tissues e. receive oxygenated blood from the heart