Which two proteins are found in tight junctions?
a. globulins and keratin
b. histone and hemoglobin
c. claudins and occludins
d. cadherins and adhesins
c. claudins and occludins
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Some of the largest naturally occurring plasmids occur in the
A) methanogens. B) genus Thermoplasma. C) extreme halophiles. D) genus Picrophilus.
The term that best describes all of the chemical reactions of a cell, including acquisition and use of molecules and
energy, is ____.
a. metabolism b. anabolism c. catabolism d. energy budget e. thermodynamics
Vertebrate colonization of terrestrial habitats
increased dramatically with the evolution of
a. lungs. b. paired appendages. c. shelled egg. d. the four-chambered heart. e. scales
Which of the following statements is true and provides evidence that a certain component of the ribosome catalyzes protein synthesis?
a. Ribosomes are inactive after protease digestion. b. Ribosomes are inactive after RNase digestion. c. Structural analysis shows that proteins occupy the catalytic site where peptide bonds are formed. d. Structural analysis shows that mRNA occupies the catalytic site where peptide bonds are formed.