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11 Dec 2019

When an abundance of amino acids occurs in the body, excess nitrogen has to be removed. One way in which this is done is by Urea Synthesis. Describe what happens when there are defects in the purine catabolic pathways. What sorts of diseases are a results the buildup of purine degradation products?

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Bunny Greenfelder
Bunny GreenfelderLv2
13 Dec 2019
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Related questions

1. Polypeptide strands is the active form of a digestive enzyme in the stomach that breaks polypeptide chains into smaller polypeptides.

2. Cleavage of proteins by pepsin in the stomach results in formation of pepsinogen which get broken down further in the small intestine.

3. An amino acid chain made up of three amino acids joined together is called a tripeptide.

4. Dipeptide describes an amino acid chain made up of two amino acids joined together.

5. The 20 different amino acids are the building blocks used for protein synthesis.

6. Amino acid pools are stockpiles found in the blood and other cells of the body that can be used to build new proteins.

7. The continual process of degrading and synthesizing protein is called protein turnover.

8. The stomach produces pepsin, which denatures protein.

9. Denaturation occurs when a protein is exposed to heat, acid, bases, or mechanical agitation resulting in unfolding of the protein, though the peptide bonds remain intact.

10. The part of an amino acid that contains nitrogen is called the amine group.

11. The acid group is also known as the carboxyl group.

12. Single amino acids that are absorbed in the small intestine travel to the liver via the portal vein.

Please correct these sentences AS SOON AS POSSIBLE.. Some of them are not correct and I didn't figure out what are they!

1 The side chain of valine is not polar because it does not havetwo types of atoms that have large differences inelectronegativity

a.) True b.) False

2 Ethanol is a polar molecule because there are largedifferences in electronegativity of the atoms and the molecule isasymmetric in shape.

a.) True b.) False

3 Which best describes a protein that is found in thecytosol?

a.) Polar amino acids will be found on the surface b.) Acidicamino acids will be found on the surface

c.) Basic amino acids will be found on the surface d.) Non-polaramino acids will be found in the interior

e.) All of the above

4 What will likely happen if two glutamates at pH 5 are next toeach other in a polypeptide chain?

a.) The side chains of these amino acids will be uncharged andthere will be no effect.

b.) The side chains of these amino acids will be charged andthey will attract each other.

c.) The side chains of these amino acids will be charged andthey will repel each other.

d.) Not enough information is given to determine the effect.

5 The difference between fetal and adult hemoglobin with regardto oxygen binding occurs because fetal hemoglobin has an amino acidsubstitution in one of its chains that results in a serine beingreplaced by a histidine.

a.) True b.) False

1. The side chain of tyrosine is considered to be polar because even though it is reminiscent of phenylalanine it also has two types of atoms that have large differences in electronegativity with asymmetry at the terminus.

a.) True

b.) False

2. Which of these changes in primary structure will be certain to cause a loss of protein activity?

a.) Asp to Glu

b.) His to Lys

c.) Trp to Ser

d.) Gly to Pro

e.) Not enough information is given since any one of these changes could be severe depending on the context of the situation

3.The difference between fetal and adult hemoglobin with regard to oxygen binding occurs because fetal hemoglobin has an amino acid substitution in one of its chains that results in a histidine (adult version) being replaced by a serine (fetal version).

a.) True

b.) False

4. What will likely happen if the side chains of aspartate and histidine at pH 5 are next to each other in a polypeptide chain?

a.) The side chains of these amino acids will be uncharged and there will be no electrostatic effect.

b.) The side chains of these amino acids will be charged and they will attract each other.

c.) The side chains of these amino acids will be charged and they will repel each other.

d.) Not enough information is given to determine the effect.

5. A beta pleated sheet:

a.) can occur between two different polypeptide chains
b.) can be formed by either intramolecular or intermolecular hydrogen bonds
c.) can only form when cysteines form disulfide bridges within this structure
d.) forms when side chains of D and E attract each other
e.) both a and b

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