Which statement is true about gene expression? Cells become specialized because different cells contain different sets of genes
Gene expression occurs primarily when DNA is replicated before the process of
mitosis
The DNA of repressed genes gets destroyed because it is not being used
A cell becomes specialized by controlling the which proteins are produced from
the cell's DNA

the truman doctrine was an american foreign policy whose stated purpose was to counter soviet geopolitical expansion during the cold war. it was announced to congress by president harry s. truman on march 12, 1947, and further developed on july 12, 1948, when he pledged to contain threats to greece and turkey.

the solute can move "downhill," from regions of higher to lower concentration, relying on the specificity of the protein carrier to pass through the membrane. this process is called passive transport or facilitated diffusion, and does not require energy.