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Protein structure— formative assessment. AP Biology 10/7/2013. Level 2.0. 1. What is the name for the variable region of the 20 amino acids?. Carboxyl group Amino group R group Alpha Carbon. 2. What functional group must be present in the R group of an acidic (-) amino acid?.

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Protein structure— formative assessment


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1 what is the name for the variable region of the 20 amino acids
1. What is the name for the variable region of the 20 amino acids?
  • Carboxyl group
  • Amino group
  • R group
  • Alpha Carbon
2 what functional group must be present in the r group of an acidic amino acid
2. What functional group must be present in the R group of an acidic (-) amino acid?
  • Carboxyl group
  • Amino group
  • Hydroxyl group
  • Carbonyl group
  • Sulfahydryl group
3 what functional group must be present in the r group of a basic amino acid
3. What functional group must be present in the R group of a basic (+) amino acid?
  • Carboxyl group
  • Amino group
  • Hydroxyl group
  • Carbonyl group
  • Sulfahydryl group
4 what functional group is most often present in a neutral yet hydrophilic amino acid s r group
4. What functional group is most often present in a neutral, yet hydrophilic, amino acid’s R group?
  • Carboxyl group
  • Amino group
  • Hydroxyl group
  • Carbonyl group
  • sulfahydryl
slide7

5. What functional group in cysteine and methionine allows them to form strong covalent bonds that stabilize a protein’s tertiary structure?

  • Carboxyl group
  • Amino group
  • Hydroxyl group
  • Carbonyl group
  • Sulfahydryl group
7 how do alpha helices and beta pleated sheets compare
7. How do alpha helices and Beta pleated sheets compare?
  • They are both forms of protein secondary structure
  • They are both formed due to formation of H bonds between N-H & C=O groups along the backbone of polypeptide chain
  • The beta sheets are more rigid & strong because they form more abundant H bonds
  • All of the above
8 r group interactions control which levels of protein folding
8. R group interactions control which levels of protein folding?
  • Primary structure & secondary structure
  • Secondary structure only
  • Tertiary & quartenary structure
  • Tertiary structure only
  • Quartenary structure only
slide12

9. Which amino acids tend to cluster in the center of an aqueous protein, but to be located on the outer edges of proteins located within a cell membrane’s lipid bilayer?

  • Acidic amino acids
  • Basic amino acids
  • Disulfide bridge forming cysteines & methionines
  • Polar, hydrophilic amino acids
  • Nonpolar, hydrophobic amino acids
slide13

If your answers were correct for 8 or 9 questions, then you should work independently on Stanford notes for Chapter 6. This power point will be online for your use in studying. If you answered 7 or fewer questions correctly, you should review the next explanation slides.

1 what is the name for the variable region of the 20 amino acids1
1. What is the name for the variable region of the 20 amino acids?
  • Carboxyl group
  • Amino group
  • R group
  • Alpha Carbon
slide15

Every amino acid contains a central (α) C, surrounded by a H, an R group (variable group), an amino group, and a carboxyl group. The amino group acts as a base, accepting a protons, whereas the carboxyl group acts as an acid, donating a proton.

slide16

Every amino acid contains a central (α) C, surrounded by a H, an R group (variable group), an amino group, and a carboxyl group. The amino group acts as a base, accepting a protons, whereas the carboxyl group acts as an acid, donating a proton.

2 what functional group must be present in the r group of an acidic amino acid1
2. What functional group must be present in the R group of an acidic (-) amino acid?
  • Carboxyl group
  • Amino group
  • Hydroxyl group
  • Carbonyl group
  • Sulfahydryl group
slide19

About 1 x 10-7 Moles water /L dissociates to produce H+ ions and OH- ions. The ratio of the two ions is 1.0, and the pH is 7—neutral. When substances known as acids are dissolved in water, then they dissociate to produce H+ions, making the H+:OH- ratio higher than 1.0. Acids are proton donors when dissolved in aqueous solution. Carboxyl groups behave asacids because they dissociateto release H+ions. The amino acidsaspartic acid & glutamic acids have a carboxyl group in their group, so they are acidic aminoacids.

3 what functional group must be present in the r group of a basic amino acid1
3. What functional group must be present in the R group of a basic (+) amino acid?
  • Carboxyl group
  • Amino group
  • Hydroxyl group
  • Carbonyl group
  • Sulfahydryl group
slide22

Bases either release OH- OR accept H+ ions when dissolved in aqueous solution. In both cases, bases reduce the H+: OH- ratio to less than 1.0 The amino group in an amino acid’s R group acts as a base, accepting a proton. The amino acids arginine and lysine act as bases.

4 what functional group is most often present in a neutral yet hydrophilic amino acid s r group1
4. What functional group is most often present in a neutral, yet hydrophilic, amino acid’s R group?
  • Carboxyl group
  • Amino group
  • Hydroxyl group
  • Carbonyl group
  • sulfahydryl
slide26

5. What functional group in cysteine and methionine allows them to form strong covalent bonds that stabilize a protein’s tertiary structure?

  • Carboxyl group
  • Amino group
  • Hydroxyl group
  • Carbonyl group
  • Sulfahydryl group
7 how do alpha helices and beta pleated sheets compare1
7. How do alpha helices and Beta pleated sheets compare?
  • They are both forms of protein secondary structure
  • They are both formed due to formation of H bonds between N-H & C=O groups along the backbone of polypeptide chain
  • The beta sheets are more rigid & strong because they form more abundant H bonds
  • All of the above
8 r group interactions control which levels of protein folding1
8. R group interactions control which levels of protein folding?
  • Primary structure & secondary structure
  • Secondary structure only
  • Tertiary & quartenary structure
  • Tertiary structure only
  • Quartenary structure only
slide34

9. Which amino acids tend to cluster in the center of an aqueous protein, but to be located on the outer edges of proteins located within a cell membrane’s lipid bilayer?

  • Acidic amino acids
  • Basic amino acids
  • Disulfide bridge forming cysteines & methionines
  • Polar, hydrophilic amino acids
  • Nonpolar, hydrophobic amino acids