The theory states that all life is composed of one or more cells, which are the fundamental units of all life.

Select the three components of the cell theory devised in the mid-1800s.Multiple select question.The cell is the fundamental unit of all life.All cells have nuclei.All organisms are made of one or more cells.All cells can arise from spontaneous generation.All cells originate from preexisting cells.

Cell theory was first proposed in 1838. Evidence obtained through additional scientific investigations resulted in the current cell theory. Which statement describes a component of the original cell theory that was removed because of the new scientific knowledge?Group of answer choicesCells form through spontaneous generation.Cells are the basic structural and functional units of life.All living things are made of cells.All living things are made of cells.

Select the correct answer.Read this summary of a scientific theory:Cells are the most basic structural and functional units of life. All living organisms are made up of one or more cells. All cells that are alive in the world today came from pre-existing cells.Which of the following would require this theory to be modified? A. Scientific observations show that microscopic organisms living in the deep ocean are not made up of cells. B. A survey finds that a majority of people believe viruses carry out the basic processes of life. C. The DNA of unicellular and multi-cellular organisms is shown to have many fundamental similarities. D. A prominent scientist says she feels strongly that one day the theory will be challenged by life on other planets.

We learned several things about cells that support the view of cells as a fundamental unit of life. Which of the following is one of them? A living thing is completely made of cells, just like a brick wall is made of bricks. Cells can grow and reproduce. Cells all have a similar, simple shape. Cells have internal structures called organelles.

Which of the following is a concept of the cell theory?Group of answer choicesThe basic structure of cells varies greatly, and is determind by the function of the cell.Only higher organisms are composed of cells.Simple cells can arise spontaneously from rotting vegetation.A cell is the basic structural and functional unit of living organisms.The subcellular organelle is the basic unit of life.