Cancer cells are different from other cells in that they have lost their "contact inhibition." Contact inhibition means:
A) most cells don't begin to divide until they bump up against other cells or collections of cells.
B) DNA replication in most cells stops when the double helix comes in contact with particular enzymes.
C) most cells stop dividing when they bump up against other cells or collections of cells.
D) DNA replication in most cells doesn't begin until the double helix comes in contact with particular enzymes.
E) most cells stop dividing when they have reached 50 cell divisions.
C) most cells stop dividing when they bump up against other cells or collections of cells.
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For surface cultivation of microorganisms, a sulfated polymer called agar can be extracted from ________ and added to liquid media in order to cause it to solidify.
A. fungi B. algae C. animal fat D. bacteria
Which term refers to a mixture of stomach juices and partially digested food?
a. chyme b. lipids c. bile d. pepsin
A number of different phylogenies (evolutionary tress) have been proposed by scientists. These phylogenies are useful because they can be used to
A. determine when two similar populations of a species evolved into two separate species B. Evaluate which groups of organisms may be most closely related C. demonstrate that all photosynthetic organisms are members of the Kingdom Plantae D. demonstrate that natural selection is the prevailing force in evolution E. demonstrate which taxa (groups of organisms) contain the most highly evolved species
The right atrium
A. is the location of the pacemaker cells of a normal heart. B. prevents blood flow from the right ventricle to the right atrium. C. prevents blood flow from the left ventricle to the left atrium. D. prevents blood flow from the pulmonary artery to the right ventricle. E. prevents blood flow from the aorta to the left ventricle.