Skip to main content
Back

Proteins and Amino Acids quiz #2

Control buttons has been changed to "navigation" mode.
1/39
  • What are the building blocks for proteins?
    The building blocks for proteins are amino acids.
  • What is a polypeptide?
    A polypeptide is a chain of amino acids linked by peptide bonds.
  • Which reagent is used to detect the presence of protein?
    Biuret reagent is used to detect the presence of protein.
  • How many codons are needed to specify three amino acids?
    Nine codons are needed to specify three amino acids.
  • What is the percent identity between the β and ε globin sequences?
    The percent identity between the β and ε globin sequences varies and requires sequence alignment for determination.
  • The codon UAA codes for which amino acid?
    The codon UAA is a stop codon and does not code for any amino acid.
  • What is a function that proteins do not typically perform?
    Energy storage
  • By what type of bond are amino acids joined together into a protein chain?
    Peptide bonds
  • What codon serves as both a start signal and codes for an amino acid?
    AUG
  • Peptidoglycan is a component of the cell wall of which organisms?
    Bacteria
  • How are these two amino acids attached?
    Two amino acids are attached by a peptide bond.
  • What enzymes attach amino acids to tRNA molecules?
    Aminoacyl-tRNA synthetases attach amino acids to tRNA molecules.
  • Which group is not a component of an amino acid molecule?
    Phosphate group
  • Amino acids are joined together by which kind of bond?
    Amino acids are joined together by peptide bonds.
  • What is attached to a peptidyl tRNA?
    A peptidyl tRNA has a growing polypeptide chain attached to it.
  • How many calories per gram does protein provide?
    Protein provides 4 calories per gram.
  • Why are proteins considered polymers but lipids not?
    Proteins are considered polymers because they are made of repeating units of amino acids, whereas lipids are not composed of repeating monomeric units.
  • What structural feature makes the 20 common amino acids different from one another?
    The R group, or side chain, makes the 20 common amino acids different from one another.
  • How many calories per gram does protein have?
    Protein has 4 calories per gram.
  • What defines a complete protein?
    Contains all essential amino acids
  • How many different types of amino acids are found in proteins?
    There are 20 different types of amino acids found in proteins.
  • What differentiates one amino acid from another?
    The R group, or side chain, differentiates one amino acid from another.
  • How many different amino acids can be in a protein?
    A protein can contain any combination of the 20 different amino acids.
  • What is the tool used to determine which triplets make each amino acid?
    The genetic code chart is used to determine which triplets make each amino acid.
  • What type of bond forms between the two amino acids?
    A peptide bond forms between two amino acids.
  • Which proteins are marked for destruction?
    Proteins marked for destruction are tagged with ubiquitin.
  • How do chaperone proteins aid in protein folding?
    They prevent aggregation, assist in proper folding, and refold misfolded proteins
  • Which of these chemicals is in peptidoglycan? A) Cellulose B) Chitin C) N-acetylglucosamine D) Starch
    C) N-acetylglucosamine
  • What makes each amino acid unique?
    Each amino acid is unique due to its specific R group or side chain.
  • Which two amino acids differ from each other by only one atom?
    Serine and cysteine differ by one atom; serine has an -OH group, while cysteine has an -SH group.
  • What distinguishes the terms polypeptide and protein?
    A polypeptide is a chain of amino acids, while a protein is a functional polypeptide with biological activity.
  • What is a polypeptide chain?
    A polypeptide chain is a sequence of amino acids linked by peptide bonds.
  • There are how many different amino acids?
    There are 20 different amino acids commonly found in proteins.
  • What is the most abundant protein on earth?
    The most abundant protein on earth is RuBisCO.
  • Protein contains how many calories per gram?
    Protein contains 4 calories per gram.
  • How many calories per gram does protein contain?
    Protein contains 4 calories per gram.
  • Protein provides how many calories per gram?
    Protein provides 4 calories per gram.
  • What are the characteristics of peptidoglycan?
    It is a polysaccharide, a component of bacterial cell walls, and contains peptide cross-links
  • How many hydrogen bonds will be found within an alpha helix that is 18 amino acids long?
    An alpha helix that is 18 amino acids long will have approximately 14 hydrogen bonds, as each turn of the helix involves hydrogen bonding every 4th amino acid.