举一反三
- When a protein is completely hydrolyzed will the further analyse: ( ) A: Only detect amino acids in S conformation B: Often detect other molecules besides amino acids C: Never detect more than 20 standard amino acids D: Never detect fewer than 20 standard amino acids E: Only detect the 20 standard amino acids
- In the process of protein digestion and absorption, the following form with the highest absorption efficiency is A: Dipeptide B: Amino acids C: Polypeptide D: Intact protein
- The spatial conformation of a protein mainly depends on A: α-helix and β-sheet B: the sequence of amino acids in polypeptide chain C: disulfide bonds in polypeptide chain D: hydrophobic effects in polypeptide chain E: hydrogen bonds in polypeptide chain
- The final products of digestion are ? A: fatty acids, starch, glucose B: protein, amino acids, glucose C: protein, fat, carbohydrate D: glucose, amino acids, fatty acids
- Only protein contains amino acids in living organism.
内容
- 0
The covalent bond between two adjacent amino acids in a protein chain is called a ___________; the chain of amino acids is also known as a polypeptide.
- 1
What about inserting a base into the coding region of a gene？ A: No impact B: It will change all amino acid sequences of the protein downstream of the insertion point C: Depending on the insertion point, it may have different effects on the protein D: An amino acid will be inserted into the protein sequence E: Three amino acids will be inserted into the protein sequence
- 2
Proteins are typically made up of chains of several hundred amino acids, whose sequence is always presented starting with the N-terminus reading from left to right.
- 3
More than ___ of all well-studied proteins contain a single structural domain. The members of these single-domain families can have different amino acid sequences but fold into a protein with a similar shape.
- 4
The correct descriptions about peptide are A: A compound formed of two or more amino acids linked by peptide bonds. B: The amino acids that make up the peptides are residues. C: The peptide chain has amino terminus and carboxyl terminus. D: Oligopeptides less than 10 amino acids don’t have function.