18 Questions
What is the one-letter abbreviation for the two peptides?
A, B
At pH = 7.0, what charges do the two peptides have?
One positive and one negative
What is the isoelectric point (pI) for each peptide?
7.0, 7.0
Which of the following is a weak acid?
Buffer
What do weak acid (base) ionization constant and Henderson-Hasselbach equation relate to?
Buffer
Which characteristic differentiates lipids from other biopolymers?
Insolubility in water
Is a virus considered a form of life?
No, due to dependency on host cells for replication
What do weak, noncovalent interactions contribute to in biological systems?
Stability of DNA double helix
Which concept relates to the choice of ATP as the energy currency?
$ ext{High-energy molecules}$
What is the predominant factor in protein stability?
Hydrogen bond formation
Why is there so little allowable rotation in the peptide bond?
Presence of hydrogen bonds
The alpha helix is characterized by:
Coil-like structure stabilized by hydrogen bonds
Which is the more stable beta sheet: parallel or antiparallel?
Antiparallel
What statement regarding the tertiary structure of proteins is false?
It is stabilized by disulfide bonds in all proteins
What contributes to the stabilization of protein structure?
All of the above
Which statement regarding protein structure is true?
Secondary structure involves interactions between R groups of amino acids
What is the main role of disulfide bonds in protein structure?
Stabilizing secondary structures
Why do proteins have limited allowable rotation around the peptide bond?
To maintain stability and rigidity of protein structure
Test your knowledge of macromolecules including nucleic acids, proteins, carbohydrates, and lipids, as well as their components and interactions such as weak interactions, water structure, and protein structure. This quiz covers topics related to the first and second law of thermodynamics, hydrophobic effects, hydrogen bonding, Van der Waals interactions, amino acid structures, peptide bond, disulfide bond, and more.
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