Chapter 3

The ________ is the smallest unit of life.

Every cell is descended from another cell. This idea is called __________ . a. evolution b. the theory of relativity c. the cell theory d. cell biology

True or false? Some protists are prokaryotes.

Cell membranes consist mainly of a ____________ a. carbohydrate bilayer and proteins b. protein bilayer and phospholipids c. lipid bilayer and proteins

Unlike eukaryotic cells, prokaryotic cells ________________ . a. have no plasma membrane b. have RNA but not DNA c. have no nucleus d. a and \(c\)

In a lipid bilayer, _____________ of all the lipid molecules are sandwiched between all the _______________ . a. hydrophilic tails; hydrophobic heads b. hydrophilic heads; hydrophilic tails c. hydrophobic tails; hydrophilic heads d. hydrophobic heads; hydrophilic tails

Put the following structures in order according to the pathway of a secreted protein: a. plasma membrane b. Golgi bodies c. endoplasmic reticulum d. post-Golgi vesicles