6. What are two of the proposed polypeptide structures named by Pauling and Corey?
The peptide bond.
the α-pleated sheet structure, or the polar pleated sheet.
The amino acid.
The amino acid sequence.
7. Is it a problem if there are errors in the amino acid sequence, and what example?
Yes, because it will affect the oxygen.
No, it will not affect anything but it will cause less oxygen.
Yes, as this will affect the structure and then the function of the protein. For example, sickle cell anemia.
No. It won't affect anything.
8. Isomers are...
structures with the same chemical formula but different atomic arramgement.
structures with the same chemical formula and atomic arrangement.
structures with the carbon atoms only.
structures with the same chemical formula and atomic arrangement, but different spatial arrangement.
9. In Sickle cell anemia we find...
normal blood cells.
no blood.
a single change in the amino acid sequence.
no change in the amino acid sequence.
10. Polar charged amino acids are...
hydrophobic
always present in their fully charged state, and are able to form ionic bonds with other charged species within a cell.
amino acids
carboxyl groups
11. What is there instead of glutamic acid in sickle cell anemia?
Thymine is there instead of glutamic acid.
Valine is present instead of glutamic acid.
Adenine is there instead of glutamic acid.
Guanine is there instead of glutamine acid.
12. An amino acid consists of...
an alpha carbon (central) bonded to an amino group (NH2), a carboxyllic group (COOH), Hydrogen atom and an R side chain.
alcohol
monomers
a pyramid structure
13. What is the tertiary structure of a protein?
Sickle cell anemia.
more complete folding that occurs in a 3D shape of a functional protein due to mainly R groups. The 3D shape is due to other bonds such as ionic bonds, disulfide bonds etc.
Has more than one or more polypeptide chain.
The amino acid sequence.
14. The sequence of amino acids will determine...
the polypeptide chain.
most but not all of the proteins 3D shape, and thus determine its function.
all of the proteins 3D shape.
the peptide chain.
15. Microorganisms use ... in some structures such as cell walls.
D- amino acids
L- amino acids
S- amino acids
animals
16. Who deduced the first amino acid sequence of a protein?
Frederick Sanger.
Joseph Knucklehead
Geremy Bennedict
Jonathan Simone
17. What is the quaternary structure of a protein?
the 3D shape.
amino acid sequence.
protein consisting of one or more polypeptide chains. Each polypeptide chain can be a subunit and can be held together by interactions such as hydrogen bonds and disulfide bonds.
alpha and beta pleated sheets.
18. Each polypeptide chain has an...
N terminal free amino acid group, and the C terminal has a free carboxyl group.
F terminal amino acid group, and D terminal has a free carboxyl group.
N terminal free amino acid group, and the D terminal has a free carboxyl group.
N terminal free amino acid group, and the F terminal has a free carboxyl group.
19. Histidine is also considered...
polar, but can only partially charge at physiological pH.
nonpolar.
a peptide bond.
a hydrogen.
20. Stereoisomers are...
structures with the same chemical formula and atomic arrangement, but different spatial arrangements.
structures with the same chemical formula but different atomic arramgement.
structures with the same chemical formula and atomic arrangement.
