Which genes were expressed in the lung cancer cells?

TP53, EGFR and KRAS  

Explanation:

  Lung cancer basically divided into Small cell lung cancer (SCLC) and non small cell lung cancer (NSCLC).NSCLC is most predominant about 85% lung cancer cause due to NSCLC. The NSCLC is further divided into adenocarcenoma,squamous cell carcenoma,and large cell lung carcenoma. The SCLC metastasizes affects other organs such as liver,bones,brain,adrenal glands apart from lungs.Squamous cell carcenoma drives from squamous cells that line the respiratory tract,adenocarcenoma drives from the cells that lines the alveoli (air sacs).The large cell lung carcenoma arises from the cells that lines of the lungs. Cancer causes due to genetic mutation.This mutations are called somatic mutations. Somatic mutations in TP53,EGFR and KRAS is more common in lung cancers. TP53 instruct to make a protein  p53 found in nucleus of cells all over the body. The EGFR and KRAS genes are instruct to make a protein which is present in the cell membrane.

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom