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BIOCHEMISTRY EXAM 3 (PORTAGE LEARNING - CHEM 210) Q&A
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BIOCHEMISTRY EXAM 3 (PORTAGE LEARNING - CHEM 210) Q&A
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BIOCHEMISTRY EXAM 3 (PORTAGE LEARNING - CHEM 210) Q&ATrue or False: The amino acids serine and threonine both contain sulfur atoms
✔ Ans - False Answer: Cysteine
True or False: The following secondary structure shown below is an example of a beta-turn. ✔ Ans - False
True or False: The side chain of phenylalanine is bonded to the backbone nitrogen atom ✔ Ans - False
True or False: The name of the molecule that binds to an enzyme is called the holoenzyme ✔ Ans - False
Answer: Substrate
True or False: The inhibitor that binds at the active site is a coenzyme ✔ Ans - False
Which amino acids differ by only one atom?
Ser and Thr
Leu and lle
Ala and Ser
Asp and Asn
Ser and Cys ✔ Ans - Ser and Cys
The formation of a peptide bond between two amino acids is an example of a ✔ Ans - condensation
The peptide Ala-Glu-Gly-Ala-Leu has ✔ Ans - Four peptide bonds
Formally, when there are 100 or more amino acids covalently linked together that is called: ✔ Ans - protein
What unit is used by biochemists to indicate the mass of a protein? ✔ Ans - kDa - Kilodaltons All the 20 standard amino acidws contain an R-group that is attached to the ✔ Ans - carbon
Which of the following correctly matches the amino acid with its one letter abbreviation ✔ Ans - Glutaminic acid, E
The order of amino acids in a protein is written ✔ Ans - N to C-Terminus
Roughly how many amino acids are there in one turn of an alpha helix ✔ Ans - 3.6
In an alpha helix, the R groups on the amino acid residues ✔ Ans - Are found on the outside helix spiral
Motifs are classified primarily by their ✔ Ans - content and arrangement of
the secondary structure (supersecondary structure)
The secondary structure shown below is an example of ✔ Ans - Antiparallel beta-sheet
The overall three-dimensional share of a single folded polypeptide is structure
✔ Ans - tertiary
How many classes of enzymes are recognized by IUBMB ✔ Ans - 6
An enzyme requires Cr+3 for catalysis. When the enzyme contains the Cr3+ it is called a/an ✔ Ans - holoenzyme
As a substrate reacts to become a product, it goes through _____, which is a high potential energy state ✔ Ans - transition state
Which of the following would change the rate of an enzyme-catalyzed reaction? ✔ Ans - PH, concentration, and temperature
Which of the following describes induced fit ✔ Ans - Substrate binding induces a conformation change in the enzyme
The ES stands for ✔ Ans - Enzyme-substrate complex
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