Amy Arce
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Biochemistry

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Amy Arce
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Chapter 2. Protein Composition and Structure

Chapter 2. Protein Composition and Structure

Question 1 of 35

1

What is the function of insulin?

Select one or more of the following:

  • Treat diabetes

  • Protein hormone

  • crucial to maintaining salt levels at appropriate levels

  • crucial to maintaining blood sugar at appropriate levels

Explanation

Question 2 of 35

1

One of the key properties of proteins are?

Select one of the following:

  • Proteins are perpendicular polymers composed of amino acids

  • proteins have a wide variety of functional groups

  • Proteins can not interact with one another and other macromolecules to form complexes

  • All proteins are rigid and flexible

Explanation

Question 3 of 35

1

A primary structure is ?

Select one of the following:

  • Chains of amino acids in a specific sequence

  • Entire chains fold into well defined structures

  • Amino acids close to one another within a sequence can fold into regular structures

  • Composed of multiple polypeptide chains called subunits

Explanation

Question 4 of 35

1

Alpha helix and beta strands are examples of secondary structures formed by adjacent alpha strands

Select one of the following:

  • True
  • False

Explanation

Question 5 of 35

1

Globular proteins such as myoglobin is an example of primary, secondary, tertiary or quaternary structure?

Select one of the following:

  • Primary

  • Secondary

  • Tertiary

  • Quaternary

Explanation

Question 6 of 35

1

Hemoglobin is an example of a quaternary structure

Select one of the following:

  • True
  • False

Explanation

Question 7 of 35

1

What are the functions of enzymes?

Select one or more of the following:

  • Degrades DNA

  • Degrades RNA

  • Catalyst

Explanation

Question 8 of 35

1

Myofibrils is an example of a protein

Select one of the following:

  • True
  • False

Explanation

Question 9 of 35

1

Fill the blank spaces to complete the text.

Four classes of amino acids are as followed: amino acids, amino acids, charged amino acids, and charged amino acids

Explanation

Question 10 of 35

1

What are the components of an amino acid?

Select one or more of the following:

  • Carbon

  • Nitrogen

  • Carboxylic acid

  • Amino group

  • R group

  • L group

Explanation

Question 11 of 35

1

Only the R isomer is found in proteins

Select one of the following:

  • True
  • False

Explanation

Question 12 of 35

1

Fill the blank space to complete the text.

At neutral pH amino acids primarily exist in the form

Explanation

Question 13 of 35

1

Which amino acid is a hydrophobic amino acid?

Select one of the following:

  • Glycine

  • Serine

  • Arginine

  • Aspartic Acid

Explanation

Question 14 of 35

1

Positively charged amino acids are

Select one or more of the following:

  • Histidine

  • Tyrosine

  • Leucine

  • Arginine

  • Isoleucine

  • Lysine

Explanation

Question 15 of 35

1

Polar amino acids are

Select one or more of the following:

  • Serine

  • Valine

  • Threonine

  • Tyrosine

  • Glutamine

  • Cysteine

  • Methionine

  • Asparagine

Explanation

Question 16 of 35

1

Fill the blank spaces to complete the text.

Negatively charged amino acids consist of acid and Acid

Explanation

Question 17 of 35

1

Phenylalanine, Tryptophan, and Methionine are examples of what amino acid?

Select one of the following:

  • Polar

  • Positively charged

  • Hydrophobic

  • Negatively charged

Explanation

Question 18 of 35

1

Glycine, alanine, proline, valine and serine are examples of hydrophobic amino acids

Select one of the following:

  • True
  • False

Explanation

Question 19 of 35

1

Peptide bonds are planar

Select one of the following:

  • True
  • False

Explanation

Question 20 of 35

1

Amino acids are linked by

Select one of the following:

  • peptide bonds to form Polypeptide chains

  • alpha helix

  • beta sheets

  • disulfide bonds

Explanation

Question 21 of 35

1

Fill the blank spaces to complete the text.

Most proteins consist of to amino acids

Explanation

Question 22 of 35

1

Polypeptide chain can be cross-linked by sulfide bonds

Select one of the following:

  • True
  • False

Explanation

Question 23 of 35

1

Secondary structure

Select one of the following:

  • Polypeptide chains that fold into regular structures such as alpha helix, and beta sheet

  • Hemoglobin

  • Myoglobin

  • Chains of amino acids in a specific sequence

Explanation

Question 24 of 35

1

Alpha helix are

Select one of the following:

  • Coiled structures stabilized by intracain hydrogen bonds

  • Stabilized by hydrogen bonds between polypeptide strands

  • Not as rod like, fully extended not tightly coiled

Explanation

Question 25 of 35

1

Osteogenesis imperfecta

Select one of the following:

  • Defect in collagen, Brittle bone disease occurs if a mutation results in the substitution of another amino acid in place of glycine

  • lack of vitamin C preventing hydroxylation of collagen leading to abnormalities in collagen

  • absence of vitamin K leading to proteins not being carboxylated

Explanation

Question 26 of 35

1

Tertiary structure

Select one of the following:

  • Refers to spatial arrangement of amino acids that are far apart in the primary structure and to the pattern of disulfide bond formation

  • Can be as simple as two identical polypeptide chains or as complex as dozens of different polypeptide chains

  • Three-dimensional structure formed by hydrogen bonds between peptide NH and CO groups of amino acids that near one another in the primary structure

Explanation

Question 27 of 35

1

Keratin and collagen are examples of fibrous proteins

Select one of the following:

  • True
  • False

Explanation

Question 28 of 35

1

Fill the blank spaces to complete the text.

Myoglobin is found within your and on your muscle

Explanation

Question 29 of 35

1

Quaternary structure

Select one or more of the following:

  • Hemoglobin

  • Globular proteins

  • Spatial arrangement of subunits and their nature of their interaction

  • Spatial arrangement of amino acids that are far apart in the primary structure

  • Structure assemble with other chains to form arrays such as the complex of six insulin molecules

  • Myoglobin

Explanation

Question 30 of 35

1

Hemoglobin is an example of tertiary structure?

Select one of the following:

  • True
  • False

Explanation

Question 31 of 35

1

Proteins can be denatured by any treatment that disrupts the weak bonds stabilizing tertiary structure such as

Select one or more of the following:

  • Heating

  • Denaturants

Explanation

Question 32 of 35

1

Scurvy is an example of a disease that results from dysfunctional protein modification and is due to?

Select one of the following:

  • Lack of vitamin D which prevents hydroxylation of collagen

  • Lack of vitamin C which prevents hydroxylation of collagen leading to abnormalities in collagen

  • due to absence of vitamin K leading to clotting proteins not being carboxylated

Explanation

Question 33 of 35

1

Hemorrhaging is due to the absence of vitamin K

Select one of the following:

  • True
  • False

Explanation

Question 34 of 35

1

Amyloidoses plaques cause disease such as

Select one or more of the following:

  • Alzheimer's

  • Parkinson's

  • Huntington's

  • HIV

  • Osteogenesis imperfecta

  • Sickle cell

Explanation

Question 35 of 35

1

The function of a promoter is to initiate process or transcription

Select one of the following:

  • True
  • False

Explanation

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