Exam 14: Proteins

Consider the level of protein structure that forms when the two polypeptides shown below interact. Which type of side chain interaction is particularly important in forming this level of structure?

Which of the following contains a sulfur atom as part of the side chain?

Consider the following description of an area of current research. "Beta-polypeptides are polymers of beta amino acids with backbones one carbon longer than alpha-polypetptides. Like the alpha-polypeptides found in nature, beta-polypeptides can form stable helices and pleated sheets." Which levels of protein structure are cited in this statement?

This image could represent the reaction in which lactase catalyzes the hydrolysis of lactose (a disaccharide) into glucose and galactose (two monosaccharides). Fill in the blanks with the appropriate letter (A, B, C, D,....) from the image. -An effector would bind at ______________________.

Consider the structure shown below. Fill in the blanks with an integer (1, 2, 3, 4, 5....) as shown in the diagram or to represent a specified number. -The atom represented by the number ____________________ could act as a proton acceptor in the hydrogen bonding present in an alpha helix.

Which of the following statements does not characterize coenyzmes?

An alpha amino acid contains

Consider the structure shown below. Fill in the blanks with an integer (1, 2, 3, 4, 5....) as shown in the diagram or to represent a specified number. -This structure contains _______________________ peptide groups.

The reaction given below would be classifed as:

Addition of 0.050 M NaOH to a protein solution would have the most profound effect on which of the listed amino acids?

Draw the structure of a tripeptide that has a C-terminal alanine, an N-terminal serine and an leucine. Indicate the backbone in the structure.

The following representation accurately depicts the structure of a peptide group.

Is it possible for a person who consumes substantial amounts of protein in their diet to suffer from protein deficiency? Explain.

This image could represent the reaction in which lactase catalyzes the hydrolysis of lactose (a disaccharide) into glucose and galactose (two monosaccharides). Fill in the blanks with the appropriate letter (A, B, C, D,....) from the image. -A competitive inhibitor would resemble _____________________.

A month after Micah's fourth birthday, his mother notices that Micah's eyes seem puffy and his ankles look swollen. Over the next couple of weeks, Micah's feet and ankles continue to swell and he seems to be short on energy, so his mother takes him to the local clinic. The nurse practitioner orders several lab tests, including a measurement of the concentration of albumin in Micah's blood and urine. a.) Is it normal to exhibit increasing puffiness, also known as edema, around the eyes, ankles, and feet? Why or why not? b.) Micah's urine test results showed significant amounts of albumin. Why would this be of concern? c.) Given Micah's significant amount of proteinuria/albuminuria, why would his serum blood level of albumin be significantly lower than usual?

What type of interaction would occur between the side chains of the two amino acids shown below?

The amino acid shown below maybe associated with ALS (Lou Gehrig's disease) and Parkinson's disease. The side chain of this amino acid listed below would be classified as:

The following is an example of a secondary protein structure.

The amino acid shown below maybe associated with ALS (Lou Gehrig's disease) and Parkinson's disease. Which of the following is the form of this amino acid at a physiological pH?

How many different amino acids are commonly found in proteins?