Without the rough er, cells would

be unable to store lipids
build up with waste
not have enough atp
be unable to produce proteins

After reading the paragraph below, answer the questions that follow. researchers have created a robot that has a very thin leg that is moved by cardiac (heart) cells contracting in unison. the robot, made of a polymer similar to that used in making contact lenses, is bathed in heart cells with supporting cells, which then attach to the robot and provide movement as they contract. all of the cardiac cells working together can cause the robot leg to move in a way that individual cells could not. this is an example of a. emergent properties of cells. b. energy flow through an ecosystem. c. adaptation. d. internal environment regulation.

Natural selection changes allele frequencies because some survive and reproduce more successfully than others.

Which organelle stores most of a cell’s dna?