The spacial conformation of protein is mainly determined by: () A: the<br/>sequence of amino acid B: α-helix<br/>and β-pleated sheets C: the<br/>side chain of amino acid in the peptide D: peptide<br/>bond in the peptide chain E: the<br/>location of disulfide bond in the peptide chain

肽键(peptide bond)

Peptide bond formation is a ___________ reaction.

合成肽疫苗（synthetic peptide vaccine）

中国大学MOOC: The signal peptide is guided to the membrane of the ER by at least two components:a _________ ,which binds to the signal peptide in the cytosol, and the _____________,which is located in the ER membrane .

Which of the following descriptions about β-sheet is correct? A: It belongs to the tertiary structure of proteins B: Two peptide chains can not be anti-parallel C: The side chain of amino acids alternately is located above the peptide unit D: The skeleton of the main chain is zigzag E: There is no hydrogen bond between β-sheet peptide chains

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.

A chain of 5 amino acids contains how many peptide bonds ?</p></p>

The primary structure of proteins consists of a sequence of amino acids linked together by peptide bonds and includes any disulfide bonds.

A codon AUG is a: A: Chain-initiating codon B: Chain-terminating codon C: Releasing factor for peptide chains D: Recognition site on the tRNA