Question

18 multiple choice 2 points what did matthias schleiden propose in 1838? the cell is the basic structural and functional unit of life all living things are composed of cells diseases originate from abnormalities at the cellular level cells divide to form new cells 19 multiple choice 2 points the basic structural component of the plasma membrane is a phospholipid bilayer integral proteins a hydrophilic bilayer cholesterol 20 multiple choice 2 points which of the following is only found in plant cells cell membrane nucleus ribosome cell wall

Explanation:

• For question 18: Matthias Schleiden proposed that the cell is the basic structural and functional unit of life in 1838.
• For question 19: The basic structural component of the plasma membrane is a phospholipid bilayer.
• For question 20: The cell - wall is only found in plant cells among the given options. Animal cells do not have a cell - wall.

Answer:

1. The cell is the basic structural and functional unit of life
2. a phospholipid bilayer
3. cell wall