You are examining an animal in lab which you do not recognize immediately, but dissection shows that it has a backbone and a two-chambered heart, so you classify it among the
A. amphibians.
B. reptiles.
C. birds.
D. fish.
E. mammals.
D. fish.
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Two strands of DNA that have been cut by an endonuclease can be sealed together by a(n)
A. polymerase enzyme. B. ligase enzyme. C. exonuclease enzyme. D. protease enzyme. E. methylase enzyme.
The maximum number of bonds that can be formed by an atom:
A. is dependent on the valence of that atom. B. is dependent on the number of unpaired electrons in its outer shell. C. can be made up of a combination of single and double bonds. D. is atom specific; for example, carbon can form four bonds, whereas oxygen forms two. E. All of these choices are correct.
_______ are glycoproteins that extend from the cytoskeleton, through the plasma membrane, and bind to structures within the extracellular matrix. They serve as adhesion molecules and relay signals between the two compartments
Fill in the blank(s) with the appropriate word(s).
Molecular oxygen attaches to the iron atoms in a hemoglobin molecule. Indicate whether the statement is true or false