A variety of finch species within the Hawaiian Islands have acquired different types of beaks needed for utilizing specific food resources. What is the likely process by which these different species of finches came about?
A. vertical descent with mutation.
B. horizontal gene transfer.
C. an accumulation of harmful genetic mutations.
A. vertical descent with mutation.
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Sam and Richard work at the local glue factory. Recently, Sam, who is a more experienced worker, has begun to establish a protégé-mentor relationship with Richard. As this process has just begun, it is best characterized as being in the ____ phase.
Fill in the blank(s) with the appropriate word(s).
The function of a protein is dependent upon the shape into which the chain of amino acids folds. Many non-covalent interactions are responsible for maintaining the protein's shape. Assume you have isolated a protein from an organism in its proper shape
and you have treated it with an enzyme that selectively targets and breaks only the peptide bonds in the proteins. Would the protein retain its shape under these conditions? A. Yes; once the shape of a protein is formed, the peptide bonds are unnecessary. B. Yes; the non-covalent interactions are stronger than the peptide bonds. C. No; while the non-covalent bonds determine the shape of a protein, the peptide bonds are required to hold the amino acids together. D. Yes; but the shape would be affected to a greater extent by changes in temperature.
In the human body, cilia play an important role in the function of each of the following organs
EXCEPT ____.
a. ventricles of the brain b. oviducts of the female reproductive system c. upper respiratory tract d. ventricles of the heart
Acetyl can be a substrate for a number of different reactions involving different enzymes and resulting in different products. This situation can be described as
A. enzymatic inhibition. B. negative-feedback inhibition. C. substrate competition. D. enzymatic competition.