The contraction would increase if the paramecium were placed in distilled water because of the change in the surrounding environment. The contractile vacuole will expel water less frequently because there is higher concentration of water outside the cell whereas the solute diffuses due to lower concentration of salt in the solution. So due to change of environment from saline solution to distill water solution, the contraction increases in the paramecium.
Cells generate energy from the controlled breakdown of food molecules. ... View Terms of Use molecules that other cells rely on for the energy required to sustain growth, metabolism, ... proteins that span the cell membrane permit specific molecules into the cell, Figure 2: Cells can incorporate nutrients by phagocytosis.
DNA replication is the process by which a molecule of DNA is duplicated. When a cell divides, it must first duplicate its genome so that each daughter cell winds up with a complete set of chromosomes.
