The Cellular Level of Organization

It separates the inner contents of a cell from its exterior environment and provides a protective barrier around the cell and regulates which materials can pass in or out.

Because they are embedded within the membrane, ion channels are examples of ________.

• receptor proteins

• integral proteins

• peripheral proteins

• glycoproteins

The copying of DNA that occurs before cell division can take place.

• DNA Transcription

• DNA Replication

• RNA Transcription

• RNA Replication

The rough ER has its name due to what associated structures?

• Golgi apparatus

• ribosomes

• lysosomes

• proteins

Cell shrinkage is also called

• crenation

• lysis

• cellular dissolution

• hydrostatic pressure

Substances outside the cell membrane are called

• intracellular substances

• extracellular substances

• intercellular substances

• Both extracellular material and intercellular material are correct names

• All of these are correct names

Which of the following organelles are incorrectly paired with their location within the cell?

• nucleolus - within the nucleus

• cilia - on the cell surface

• golgi apparatus - on the cell surface

• microtubules - within the cytoplasm

• smooth endoplasmic reticulum - within the cytoplasm of the cell

Cell membranes are said to be selectively permeable because they

• allow the free passage of some materials and restrict the passage of others

• allow the passage of materials in one direction but not the other

• permit the passage of most materials but not of water

• Cell membranes are NOT normally selectively permeable.

Which of the following cell organelles is NOT correctly matched with its function?

• nucleus - contains genes that determine the structure and function of each cell

• lysosome - contains digestive enzymes

• mitochondria - site of protein synthesis

• Golgi apparatus - packages proteins in secretory vesicles

• smooth ER - site of lipid synthesis

The movement of substances across the membrane without the expenditure of cellular energy.

• Active

• Passive

• Neutral

• All of these