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Chapter 3: Problem 31

Which of the following may cause a protein to denature? a. changes in pH b. high temperatures c. the addition of some chemicals d. all of the above

Short Answer

Expert verified
d. all of the above

Step by step solution

01

Understand Protein Denaturation

Protein denaturation is the process in which proteins lose their native structure and, therefore, their function due to external stress or compound.
02

Examine Effect of pH Change

Changes in pH can disrupt the ionic bonds and hydrogen bonds that help maintain a protein's structure. Extreme changes in pH can cause a protein to denature.
03

Examine Effect of High Temperature

High temperatures increase the kinetic energy of molecules, which can disrupt the intermolecular forces and interactions, leading to the denaturation of proteins.
04

Examine Effect of Chemicals

Certain chemicals, such as detergents, heavy metals, and solvents, can interfere with the bonds and interactions that hold a protein in its specific shape, causing it to denature.
05

Conclusion

Since changes in pH, high temperatures, and certain chemicals can all cause a protein to denature, the correct option is 'all of the above.'

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Changes in pH
Proteins are highly sensitive to the pH levels of their environment.
Changes in pH can disrupt the delicate ionic bonds and hydrogen bonds that stabilize the protein's structure.
When the pH shifts too far from the protein's optimal range, these bonds can break.
As a result, the protein loses its specific shape and becomes denatured. This can happen in both acidic and basic conditions.
For instance, consider how gastric acids in the stomach can denature food proteins during digestion.
High Temperatures
Temperature plays a crucial role in maintaining protein structure.
With high temperatures, the kinetic energy of the protein's molecules increases.
This heightened energy state causes the molecules to move more vigorously.
Such movement can disrupt the intermolecular forces essential for holding the protein together.
Once these forces are broken, the protein unfolds and becomes inactive.
That is why cooking an egg changes its texture鈥攈eat denatures the egg鈥檚 protein, causing it to solidify.
Chemical Interactions
Chemical agents can interact with proteins in various ways that lead to denaturation. These agents include:
  • Detergents
  • Hydrogen peroxide
  • Heavy metals like mercury or lead
  • Solvents such as alcohols
These chemicals can break the bonds maintaining the protein鈥檚 structure.
Some chemicals might add or remove certain chemical groups from the protein, altering its chemical properties and thus its structure.
For example, alcohols can disrupt the hydrogen bonding through their ability to form their own hydrogen bonds with protein molecules.
Ionic Bonds
Ionic bonds play a key role in the stability of proteins, helping to maintain their 3D structure.
These bonds form between oppositely charged side chains of amino acids.
Any factor disrupting these ionic interactions can denature a protein.
Changes in pH make this disruption possible due to the addition or removal of hydrogen ions, which can neutralize the charged groups.
Thus, ionic bonds are quite sensitive to the acidic or basic nature of the environment surrounding the protein.
Protein Structure
Proteins are complex molecules with unique structures necessary for their functions.
Their structures range from primary to quaternary levels:
  • Primary structure refers to the sequence of amino acids.
  • Secondary structure focuses on local folding patterns such as alpha-helices and beta-sheets.
  • Tertiary structure covers the overall 3D conformation of a single polypeptide chain.
  • Quaternary structure describes the arrangement of multiple folded protein subunits.
Denaturation causes disruptions primarily in the tertiary and quaternary structures, rendering the protein nonfunctional. This structural integrity is vital for biological activities like enzyme catalysis and molecular binding.

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Most popular questions from this chapter

What are the building blocks of nucleic acids? a. nitrogenous bases b. nucleotides c. peptides d. sugars

You have been identifying the sequence of a segment of a protein. The sequence to date is: leucine-methionine-tyrosine-alanine-glutamine-lysine-glutamate. You insert arginine between the leucine and methionine. What effect would this have on the segment? a. Arginine is a negatively charged amino acid and could attach to the glutamate at the end of the segment b. Inserting arginine places a positively charged amino acid in a portion that is non-polar, creating the possibility of a hydrogen bond in this area. c. There would be no effect other than an additional amino acid. d. The arginine could attach to the lysine and bend the protein chain at this point.

Why is it impossible for humans to digest food that contains cellulose? a. There is no energy available in fiber. b. An inactive form of cellulase in human digestive tract renders it undigested and removes it as waste. c. The acidic environment in the human stomach makes it impossible to break the bonds in cellulose. d. Human digestive enzymes cannot break down the \(\beta-1,4\) glycosidic linkage in cellulose, which requires a special enzyme that is absent in humans.

Which structural level of proteins is most often associated with their biological function? a. the primary structure b. the secondary structure c. the tertiary structure d. the quaternary structure

For many years, scientist believed that proteins were the source of heritable information. There are many thousands of different proteins in a cell, and they mediate the cell's metabolism, producing the traits and characteristics of a species. Researchers working with DNA viruses proved that it is DNA that stores and passes on genes. They worked with viruses with an outer coat of protein and a DNA strand inside. How did they prove that it was DNA, not protein, which is the primary source of heritable information? a. The DNA and protein of the virus were tagged with different isotopes and exposed to host cell where only the DNA was transferred to the host. b. The DNA was tagged with an isotope, which was retained in the virus, proving it to be the genetic material. c. The viral protein was tagged with an isotope, and the host cell was infected by it. This protein was transferred to the host. d. The viral DNA, when sequenced, was found to be present in the host cell proving it to be the hereditary material instead of protein.
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