The double layered sac that surrounds the heart
and protects and anchors it is called the
a. peritoneum.
b. perineum.
c. pericardium.
d. peristalsis.
e. periwinkle
C
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Select the potential problems with using current dispersal barriers (for example, a mountain range) to delineate biogeographical regions. Check all that apply.
_____ A barrier for one group of organisms may not be a barrier for another group of organisms. _____ The world's biota correspond more closely to political boundaries. _____ Global climate change may change the distribution of taxa and the size and/or location of some of the dispersal barriers. _____ Human conflicts lead to ever-changing political boundaries. _____ Distantly related organisms with similar appearance and habits may exist on either side of a dispersal barrier.
What color develops when biuret reacts with proteins in a sample?
a. Blue b. Blue-green c. Purple d. Red
The secretion of digestive juices is regulated by the ____________ system and ________ hormones
Fill in the blank(s) with the appropriate word(s).
Which of the following is an accurate description of the plasma membrane?
A) It is a phospholipid bilayer embedded with proteins. B) It is permeable to all substances. C) It is a solid material. D) It separates the nuclear contents from the environment.