Question

In: Chemistry

Which of the following amino acids exists predominantly as a zwitterion? The terminal amino group, terminal...

Which of the following amino acids exists predominantly as a zwitterion? The terminal amino group, terminal carboxyl group, and side chain pKa values can be found in Table 3.1 (Any pKa table).

A. leucine at pH = 10
B. histidine at pH = 5
C. glutamic acid at pH = 3.5
D. tyrosine at pH = 11.5
E. lysine at pH = 7

Solutions

Expert Solution


Related Solutions

Proteins are ______________ built from amino acids, which each have an amino group
Proteins are ______________ built from amino acids, which each have an amino group and a _____________ group attached to the central _______________. There are twenty possible _______________ that differ in structure and are generally referred to as “R.” In solutions of neutral pH, amino acids are _______________, carrying both a positive and negative charge. When a protein is made, amino acids are linked together through _______________, which are formed by condensation reactions between the carboxyl end of the last amino...
Two of the facts which differentiate lipids and carbohydrates from amino acids are that, amino acids...
Two of the facts which differentiate lipids and carbohydrates from amino acids are that, amino acids can neither be stored nor excreted. true false A baby got sick a few weeks after birth and test results show that the baby had higher than normal levels of the amino acid phenylalanine. Which of the following best describes the baby's probable diagnosis? The baby has maple syrup disease The baby has PKU More lab test are needed to confirm the cause malady...
1. Which of the following is not an example of a posttranslational modification? A. N-terminal amino...
1. Which of the following is not an example of a posttranslational modification? A. N-terminal amino acid(s) commonly removed or modified B. signal/targeting peptide remova l C. phosphorylation, methylation, acetylation D. Glycosylation E. All of the above are examples of posttranslational modifications 2. The major problem that arises from incorporating incorrect tautomers into a cell’s DNA is that: A. they react with adjacent bases to form dimers. B. they often lead to slippage problems during replication. C. they cannot be...
11.Which of the following sequences of amino acids is the most likely to be located on...
11.Which of the following sequences of amino acids is the most likely to be located on the exterior of a water soluble globular protein? a. Arg-Ser-Gln-Pro-His b. Met-Phe-Ile-Leu-Ala c. Val-Leu-Ser-Ala-Val d. Met-Val-Cys-Leu-Gln QUESTION 12 1.     Which pair of amino acid side chains might form a London dispersion force type of van der Waals interaction in a globular protein? a. His and Ser b. Ala and Gln c. His and Met d. Val and Met QUESTION 13 1.     The β-hairpin consists...
SNARE helical motifs share a universal length (~60 amino acids). The N’ to C’ terminal zippering...
SNARE helical motifs share a universal length (~60 amino acids). The N’ to C’ terminal zippering to form a highly stable four-helical bundle is thought to provide the energy to fuse membranes. First principles suggest that a longer SNARE four helical bundle would provide greater fusion energy per SNARE bundle, necessitating fewer SNAREs for each membrane fusion. However, families of longer SNAREs (e.g., 120 or 180 amino acids) are unknown. Suggest a possible rationale for why longer SNAREs don’t co-exist...
The 21st and 22nd amino acids found in proteins are the rare amino acids ______________ and...
The 21st and 22nd amino acids found in proteins are the rare amino acids ______________ and ______________. ________________ are nonviral genetic elements that have reverse transcriptase activity. An example of retrotransposons in the human genome is the ____ family of sequences.
Which amino acids are conformationally restricted (rigid) and which is the least?
Which amino acids are conformationally restricted (rigid) and which is the least?
\Match the following descriptions with the corresponding amino acids: This amino acid is responsible for the...
\Match the following descriptions with the corresponding amino acids: This amino acid is responsible for the strength of rhino horns and wood lignin due to the strong hydrophobic interactions between them. Subtle decreases in the serum pH lead to the protonation of this amino acid, which promotes O2 release from hemoglobin. This amino acid is the nucleophile chymotrypsin uses to attack peptide bonds. This amino acid disrupts α-helices because it makes the nearby protein backbone too flexible (and prevents proper...
Which of the following amino acids has a side chain that can serve as a hydrogen...
Which of the following amino acids has a side chain that can serve as a hydrogen bond donor (but not acceptor) in its predominant form at pH 7? D K M V N
All amino acids have two ionizable functional groups: an α-amino group (average pKa of 9.4) and...
All amino acids have two ionizable functional groups: an α-amino group (average pKa of 9.4) and an α-carboxylic acid group (average pKa of 2.2). Arginine also has an ionizable side chain (R group) with a pKa of ~12.5. One of the possible ionization states of arginine is shown below. At what pH would the above structure be the predominant ionization state? Note: Consider the ionization state of all three of the functional groups. The protonated form of the R group...
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT