Nester's Microbiology: A Human Perspective
9th Edition
ISBN: 9781259709999
Author: Denise G. Anderson Lecturer, Sarah Salm, Deborah Allen
Publisher: McGraw-Hill Education
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Chapter 2, Problem 2CT
A biologist determined the amounts of several amino acids in two separate samples of pure protein. The data are shown here:
| Amino Acid | Leucine | Alanine | Histidine | Cysteine | Glycine |
| Protein A | 7% | 12% | 4% | 2% | 5% |
| Protein B | 7% | 12% | 4% | 2% | 5% |
The scientist concluded that protein A and protein B were the same protein. Do you agree with this conclusion? Justify your answer.
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Which of the following statements is FALSE?
Select one:
a.
Secondary structure of a protein determines how it folds up into a unique three dimensional structure.
b.
Three dimensional structure of a protein determines the function of a protein.
c.
Primary structure of a protein determines how it folds up into a unique three dimensional structure.
d.
Amino acid sequence is absolutely important for a particular protein.
How would adding acid to a non-buffered solution be most likely to affect protein structure?
Select one:
a. Adding acid would disrupt the primary structure of the protein
b. Adding acid would cause the protein to become a lipid
c. Adding acid would cause the protein to become a carbohydrate
d. Adding acid would disrupt the secondary and tertiary structure of the protein
If you made two chains of proteins using different amino acids, would the tertiary structure of the two polypeptides be the same? Why or why not?
Chapter 2 Solutions
Nester's Microbiology: A Human Perspective
Ch. 2 - Differentiate between an atom, a molecule, and a...Ch. 2 -
2. Why is water a good solvent?
Ch. 2 - Which solution is more acidic, one with a pH of 4...Ch. 2 - Prob. 4SACh. 2 - Prob. 5SACh. 2 - What is a structural isomer?Ch. 2 - Name the major groups of lipids and give an...Ch. 2 - List six functions of proteins.Ch. 2 -
9. What are the four levels of protein structure,...Ch. 2 - How do DNA and RNA differ from one another in...
Ch. 2 - Choose the list that goes from the lightest to the...Ch. 2 -
2. An oxygen atom has an atomic number of 8. It...Ch. 2 - Dehydration synthesis is involved in the synthesis...Ch. 2 - The primary structure of a protein relates to its...Ch. 2 -
5. Pure water has all of the following properties...Ch. 2 - When the pH of a solution changes from 3 to 8, the...Ch. 2 - A shortage of nitrogen (N) would make it most...Ch. 2 - Complementarity plays a major role in the...Ch. 2 - Prob. 9MCCh. 2 - The function of a buffer is to a) bring the pH of...Ch. 2 - A group of prokaryotes known as thermophiles...Ch. 2 -
2. Microorganisms use hydrogen bonds to attach to...Ch. 2 - What properties of the carbon atom make it ideal...Ch. 2 -
2. A biologist determined the amounts of several...Ch. 2 - The table on the right indicates the freezing and...
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- Which type of amino acid would you expect to find in large numbers in a protein found in a deep-sea hydrothermal vent (a very hot environment)? A.)Polar amino acids B.)Cysteines C.)Hydrophobic amino acids D.)Nonpolar amino acidsarrow_forwardWhich of the following are involved in protein secondary structure? select one or more : a. van der waal forces b. Disulfide bridges c. Hydrogen bonds d. Peptide bondsarrow_forwardThe enzyme caspase-14 is manufactured by skin cells. Caspase-14 functions in the cytoplasm to make outer skin cells firm. When the amino acid chain of caspase-14 is folded, it makes an beta-pleated sheet. This describes which level of protein structure? Question 9 options: Primary structure Secondary structure Tertiary structure Quaternary structurearrow_forward
- Above is an uncommon amino acid called dehydrobuyterine. Three parts of the molecule are circled. Question 6.1 C The red circle (C) represents: :the side chain :the alpha carbon :the backbone Question 6.2 B Q6.2 B The blue shape (B) represents: :the side chainChoice :the backbone :the alpha carbon Question 6.3 A Q6.3 A The green shape (A) represents: :the side chain :the backbone :the alpha carbonarrow_forwardA shampoo bottle lists “partially hydrolyzed protein” as one of its ingredients. What is the difference between partially hydrolyzed protein and completely hydrolyzed protein?arrow_forwardAt what level of protein structure does each of the following denaturation act? a. heat b. strong acid c. saturated salt solution d. organic solvents (e.g., alcohol or chloroform)arrow_forward
- Rose loves eating oats for her breakfast. Her friend Lisa who is a chemist, found out that oats contain 0.11 mole arginine, 0.5 histidine and 0.4 lysine. What is the % of arginine in the protein present in oats? Unknown: Given: Formula: Solution: Final Answer:arrow_forwardWhich of the following is TRUE, if the protein pH is electrically neutral? Refer to the graph below. a. The denaturation of protein is lower than 100% b. The denaturation of protein is greater than 100% c. The protein is in native form d. The protein is completely denaturedarrow_forwardA portion of a polypeptide chain contains the following sequence of amino acids: (-Met, -Leu, -Ala, -Cys, -Asp-) a.) Which amino acid can form a disulfide bond? b.) Which amino acids are likely to make the polypeptide more soluble in water? c.) Which amino acids are likely to make the polypeptide less soluble in water? d.) How does the primary structure of a protein affect its tertiary structure?arrow_forward
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