Why are immortal cell lines important for biological research? a. they have two nuclei, allowing them to divide faster than normal cells. b. they can replicate indefinitely and do not experience natural cell death. c. they grow larger than normal cells so that they can divide into multiple cells. d. they grow spontaneously rather than going through the process of mitosis.

Ans.

Immortal cell lines show a population of cells, derived from a normal cell of a multicellular organism that would generally not divide indefinitely, but due to genetic mutations, have evaded normal cell death or cellular senescence and become immortal.

These cells are important for biological research as they can replicate indefinitely and provide a continuous supply of desired materials, and they are easy to use and cost effective.

Thus, the correct answer is option b). they can replicate indefinitely and do not experience natural cell death.

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.