Some observations have suggested to researchers that substances associated with the extracellular matrix may be involved in cell migration. This has been observed with the cell marker CD44 on the surface of cancer cells and their ability to be separate from one another and to easily metastasize to other regions of the body. This is most likely due to the interaction of CD44 and
A) chondrotin sulfate.
B) ICAMs.
C) hyaluronate.
D) fibronectins.
E) elastin.
C) hyaluronate.
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Which one of the following is necessary for messenger RNA to be formed in the nucleus?
A. Ribosomes must be present. B. The cell must have an abundant supply of DNA nucleotides. C. RNA polymerase must be present and functioning. D. Chromosomes must be synapsed.
Fructose and glucose are both ____.
A. six-carbon sugars B. disaccharides C. monosaccharides D. disaccharides and six-carbon sugars E. monosaccharides and six-carbon sugars
Following are the structures of three fatty acids: palmitic acid, stearic acid, and oleic acid. What combination of these fatty acids could you use to make a fat that is liquid at room temperature?
A) one palmitic acid, one stearic acid, and one oleic acid
B) three palmitic acids
C) two palmitic acids and one stearic acid
D) one stearic acid, one oleic acid, and one phosphate group
Mitochondria transfer ________ energy from ________ to ATP; chloroplasts transform ________ energy into the chemical energy of ATP.
A) chemical . . . food . . . light B) nuclear . . . light . . . food C) food . . . light . . . chemical D) food . . . light . . . nuclear E) light . . . food . . . kinetic