Transport across membranes All cells are enclosed by a cell membrane, which is selectively permeable. Molecules can move into or out of cells by diffusion and active transport. Cells can gain or ...

This gives them a rigid structure. Supports and strengthens cell? Cell membrane Selectively permeable double layer of lipid and protein molecules? All cell types ? Fluid enclosed by the cell ...

In particular, organelles called chloroplasts allow plants to capture the energy of the Sun in energy-rich molecules; cell walls ... The outer membrane is permeable to small organic molecules ...

We have developed a non-radioactive flow-cytometry assay to monitor and quantify the target-cell killing activities mediated by cytotoxic T lymphocytes (CTLs). This flow-cytometry CTL (FCC ...