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BCHM 307 QUIZ 2 QUESTIONS WITH VERIFIED ANSWERS

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BCHM 307 QUIZ 2 QUESTIONS WITH VERIFIED ANSWERS Hydrocarbons will always be (Hydrophilic/hydrophobic) - Answer-Hydrophobic 2 amino acids with sulfur - Answer-Methionine and Cystine What is the first amino acid in all proteins - Answer-Methionine (Met, M) What is the start codon? - Answer...

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  • August 30, 2024
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  • 2024/2025
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  • Questions & answers
  • BCHM 307
  • BCHM 307
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BCHM 307 QUIZ 2 QUESTIONS WITH
VERIFIED ANSWERS
Hydrocarbons will always be (Hydrophilic/hydrophobic) - Answer-Hydrophobic

2 amino acids with sulfur - Answer-Methionine and Cystine

What is the first amino acid in all proteins - Answer-Methionine (Met, M)

What is the start codon? - Answer-Methionine (Met, M)

Three letter start codon - Answer-AUG

Only amino acid with a fused ring system, most proteins have atleast one, absorbs UV
light at 280nm - Answer-Tryptophan (Trp, N)

Only amino acid whose side chain loops back into its own back bone, produces kinks in
a polypeptide sequence - Answer-Proline (Pro, P)

Polar amino acids are often found where? Why? - Answer-in the active sites of enzymes
because they can facilitate chemical catalysis

can form disulfide bonds with itself, condensation reaction, can form interchain
crosslinks - Answer-Cystine (Cys, C)

OH group is key to being polar, other chemicals can covalently bond to the OH group -
Answer-Serine (Ser, S)

OH group is key to being polar, very prominent in nucleophiles - Answer-Threonine
(Thr, T)

Derivative of phenylalanine, precursor of amino acid derivatives that are
neurotransmitters
Polar, uncharged - Answer-Tyrosine (Tyr, Y)

Asparagine (Asn, N) side chain - Answer--CH2-C(=O)-NH2

Glutamine (Gln, Q) side chain - Answer--CH2-CH2-C(=O)-NH2

Asparagine and Glutamine are both (polar/nonpolar) (Charged/uncharged) - Answer-
polar, uncharged

, Nitrogen containing ring, polar/uncharged, doesn't fit into a group well - Answer-
Histidine (His, H)

Both are definitely charged and have long side chains with positively charged amine
groups - Answer-Lysine (Lys, K) and Arginine (Arg, R)

The pK of the nitrogen ring of Histidine is - Answer-6

analogous to asparagine and Glytamine, but these both have carboxylate groups

Low pK, pretty much always deprotonated - Answer-Aspartate and Glutamate

Amino acids are linked via _________. - Answer-condensation (dehydration) reactions

Amino acids are polymerized via - Answer-a peptide bond

A peptide bond it created when - Answer-amino acid #1 (the carboxylic acid) reacts with
the amine group of amino acid #2

4 levels of protein structure - Answer-1. Primary
2. Secondary
3. Tertiary
4. Quaternary

Primary structure definition - Answer-The sequence of amino acid residues

(Glu-Ser-Phe-Gly-Asp-)

Secondary structure definiton - Answer-the localized conformation of the polypeptide
backbone

What protein structure?: first three dimensional folding - Answer-Secondary

What protein structure?:
represented by space filling, "Ribbon Diagram", & "Ball and Stick" - Answer-Secondary

What protein structure?:
alpha helix and beta sheet - Answer-Secondary

H bonds form in an alpha helix between - Answer-the carbonyl oxygen and the amino
hydrogen

What protein structure?:

a folded polypeptide assumes a shape with a hydrophilic surface and a hydrophobic
core - Answer-Tertiary structure

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