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. 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!
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Please help! Not sure about these questions..thanks
QUESTION 1
An example of an endergonic reaction is
A. | Polymerizing a protein from amino acids. | |
B. | Breaking a protein down into amino acids. | |
C. | Breaking down ATP into ADP and P. | |
D. | Breaking down glucose (using oxygen) to make CO2 and H2O. |
QUESTION 2
When ATP breaks down to supply energy for cellular reactions, it often transfers its 3rd phosphate to another molecule. This is called ______, and makes the other molecule _______ reactive.
A. | catalysis . . . more | |
B. | phosphorylation . . . more | |
C. | phosphorylation . . . less | |
D. | polymerization . . . less |
QUESTION 3
Which is true of enzymes?
A. | They are highly specific in the reactions they catalyze. | |
B. | Chemically, most are carbohydrates. | |
C. | They accelerate reactions by adding energy. | |
D. | They break down and are used up as they catalyze reactions. |
QUESTION 4
What is peristalsis?
A. | Rings of muscle that can contract to close off the stomach at each end. | |
B. | A gland that secretes saliva. | |
C. | Coordinated muscle contractions that move the contents of the GI tract. | |
D. | A stomach enzyme that breaks down proteins. |
QUESTION 5
Which is not a component of gastric juice?
A. | H2O | |
B. | acid | |
C. | pepsin | |
D. | amylase | |
QUESTION 6
What does the enzyme pepsin do?
A. | Completely breaks down proteins into individual amino acids. | |
B. | Completely breaks down carbohydrates into monosaccharides. | |
C. | Partially breaks down proteins into smaller polypeptides. | |
D. | Partially breaks down fats into fatty acids. |