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.
Answer: C
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The placenta
A) is where blood cells form before the fetus has bone marrow. B) nourishes the fetus and secretes hormones that maintain the pregnancy. C) is a membrane surrounding the embryo that gives rise to the blood vessels in the umbilical cord. D) is the membrane that contains the fetus.
Which level of regulation directly determines the rate at which proteins are made?
a. transcriptional regulation b. posttranscriptional regulation c. translational regulation d. posttranslational regulation e. chromatin remodeling regulation
Division and differentiation of ground meristem gives rise to ____
a. ground tissue b. vascular tissue c. dermal tissue d. protoderm e. procambium
An accident victim receives a blood transfusion. Shortly thereafter, he begins to have difficulty breathing, develops a fever, and experiences nausea and vomiting. Which of the following is the most likely interpretation of these events?
A) The blood transfusion was mismatched. B) The blood transfusion contained pyrogens. C) The recipient had previously been exposed to foreign blood group antigens. D) The blood transfusion was mismatched and contained pyrogens. E) The blood transfusion was mismatched and the recipient had previously been exposed to the foreign blood group antigens.