The correct descriptions about prion are
A: It is a normal component of mammalian brain cells.
B: The secondary structure is rich in α-helices.
C: The prions with structural variations can aggregate with each other to form amyloid fiber precipitation.
D: The prions are viruses containing nucleic acids.
A: It is a normal component of mammalian brain cells.
B: The secondary structure is rich in α-helices.
C: The prions with structural variations can aggregate with each other to form amyloid fiber precipitation.
D: The prions are viruses containing nucleic acids.
举一反三
- The misfolded prion form of a protein can convert the properly folded version of the protein in an infected brain into the normal conformation. This allows the misfolded prions, which tend to form aggregates, to spread rapidly from cell to cell, eventually causing the death of the affected animal or human.
- Prions are considered “_________” because they can also spread from an affected individual to a normal individual via contaminated food, blood, or surgical instruments.
- 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
- Proteins are natural polymers of amino acids with primary structure, secondary structure, tertiary structure and quaternary structure.
- Which are correct about the descriptions of mRNA? A: Among the three RNAs, the metabolic rate is the fastest B: The secondary structure contains local double helix C: It consists of two subunits D: There are m7Gppp cap and polyA tail E: It contains genetic information