[单选题]
The electron micrograph beu:i 8md0 mc)o c/3mheplow show0j7vna *:s qjbmf+q7 ss a cell of the bacterium Vibrio cholerae. Which of the labelled st0qbasnfj+7qm7v j*s:ructures maintains the cell’s shape and protects the cell from lysing during osmosis?