Which of the following is most likely an example of signaling through a transmembrane receptor? 1.The influenza virus recognizes specific proteins on the surface of host cells, causing the entrance of genetic
materials into the cytoplasm of the host cells.
2.Low-density lipoproteins (LDL) bind to receptor proteins found on the membrane of receiving cells, triggering
internalization into the receiving cells.
3.The binding of interleukin-6 (IL-6) to the interleukin-6 receptor causes the activation of protein kinases in the
cytoplasm, activating the transcription factor NF-kB.
4.The binding of aldosterone to the aldosterone receptor activates its transcription activity, leading to the trans
genes that promote the uptake of ions and water.