7/28/2019 Bell Ringer - Reading about cells

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BR#31 BR#31

Name: ______________________________________________

Date: ___________________

All cells have an outer membrane called a plasma membrane. The plasma

membrane encloses a semifluid substance called the cytoplasm and the

cells genetic material. The plasma membrane regulates what enters andexits cells; the cytoplasm carries on chemical reactions; and the genetic

material provides the information needed for growth and reproduction.

When a cell reproduces, it produces more cells. The concepts that all

organisms are composed of cells, and that cells come only from

preexisting cells, are the two central tenets of the cell theory. Cells are

divided into two main types according to the way their genetic material is

organized. Prokaryotic cells are so named because they lack a membrane-

bounded nucleus. Their DNA is located in a region of the cytoplasm called

the nucleoid. The other type of cell, called a eukaryotic cell, has a nucleusthat houses its DNA.

1. What is the outer most membrane of the cell called?_______________________________________________________

2. What is the function of the plasmamembrane?_____________________________________________

_______________________________________________________

_______________________________________________________

3. What is enclosed in the plasma membrane?a. Waterb. Cytoplasmc. Chocolate milk

4. In a sentence, list one of the concepts of the cell theory.

Name: ______________________________________________

Date: ___________________

All cells have an outer membrane called a plasma membrane. The plasma

membrane encloses a semifluid substance called the cytoplasm and the

cells genetic material. The plasma membrane regulates what enters andexits cells; the cytoplasm carries on chemical reactions; and the genetic

material provides the information needed for growth and reproduction.

When a cell reproduces, it produces more cells. The concepts that all

organisms are composed of cells, and that cells come only from

preexisting cells, are the two central tenets of the cell theory. Cells are

divided into two main types according to the way their genetic material is

organized. Prokaryotic cells are so named because they lack a membrane-

bounded nucleus. Their DNA is located in a region of the cytoplasm called

the nucleoid. The other type of cell, called a eukaryotic cell, has a nucleusthat houses its DNA.

1. What is the outer most membrane of the cell called?_______________________________________________________

2. What is the function of the plasmamembrane?_____________________________________________

_______________________________________________________

_______________________________________________________

3. What is enclosed in the plasma membrane?a. Waterb. Cytoplasmc. Chocolate milk

4. In a sentence, list one of the concepts of the cell theory.