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UNE Biochemistry Unit 1 Questions and Answers 100% Pass
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UNE Biochemistry Unit 1 Questions and Answers 100% Pass What is primary structure of a protein? - Linear sequence of amino acids in a polypeptide chain written from the N-terminus to the C-terminus. What kind of structure contains a-helices and B-pleated sheets? - Secondary structure How are a...

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  • January 8, 2025
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  • 2024/2025
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UNE Biochemistry Unit 1 Questions
and Answers 100% Pass

What is primary structure of a protein? - ✔✔Linear sequence of amino acids in a polypeptide chain

written from the N-terminus to the C-terminus.


What kind of structure contains a-helices and B-pleated sheets? - ✔✔Secondary structure


How are a-helices formed? - ✔✔The CARBONYL group of a peptide bond forms a HYDROGEN bond

with the AMIDE nitrogen of another peptide bond FOUR amino acids down the chain.


Are a-helices weak and loose or compact and rigid? - ✔✔Compact and rigid


a-helices comprise what fraction of secondary structures? - ✔✔About 1/3


Which amino acid can cause a kink in a-helices and is therefore not typically found in them? - ✔✔Proline


How are B-pleated sheets formed? - ✔✔B strands are connected laterally by at least two or three

hydrogen backbone bonds.


B-pleated sheets are formed laterally between which groups on either B strand? - ✔✔C=O groups and

NH groups


In which directions do R groups on B pleated sheets always protrude? - ✔✔Up or down.


If the B-pleated sheet has a hydrophobic side, where is it? - ✔✔Buried in the protein and will rarely be

exposed to the polar H2O solvent.




EMILY CHARLENE © 2025, ALL RIGHTS RESERVED 1

, If the B-pleated sheet has a hydrophilic side, where is it? - ✔✔On the surface of the protein and exposed

to the polar H2O solvent.


What are bends/turns/loops? - ✔✔Shorts stretches of the polypeptide chain that are stabilized by

hydrogen bonds and are NOT random


What is tertiary protein structure? - ✔✔The total 3D conformation of the polypeptide chain including

interactions between a-helices, B-pleated sheets and any loops/turns/bends


The Rossman fold is an example of what type of structure? - ✔✔Tertiary


What is a structural domain? - ✔✔A section of protein sufficient to perform a chemical or physical task.

They are DEFINED regions with CONSERVED function.


What is a motif? - ✔✔Common arrangement of secondary structures to form a tertiary arrangement


What is quaternary structure? - ✔✔A combination of two or more tertiary subunits that work as one

functioning unit.


What are similarities between myoglobin and hemoglobin? - ✔✔They are homologous. They have similar

primary sequences. They both bind oxygen.


What is the function of hemoglobin? - ✔✔Travels through the blood inside a red blood cell in order to

deliver oxygen form the lungs to the tissues


What is the function of myoglobin? - ✔✔Remains in the heart and the skeletal muscles in order to bind

oxygen that is released by hemoglobin.


What is an apoprotein missing? - ✔✔Its ligand. An example is hemoglobin if it were missing heme.


What is a holoprotein? - ✔✔A protein that has its ligand so that it is able to function.




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