scanning electron microscopy (SEM) to study the detailed structure of the surfaces of cells
	transmission electron microscopy (TEM) to study the distribution of organelles in a living cell
	transmission electron microscopy (TEM) to study ultrastructural features inside the cell
	light microscopy to study the movement of cells growing on a surface
	cell fractionation to study the function of specific organelles

	the presence or absence of a rigid cell wall
	whether or not the cell is partitioned by internal membranes
	the presence or absence of ribosomes
	whether or not the cell carries out cellular metabolism
	whether or not the cell contains DNA

	The components of the ribosomes are first assembled in the nucleus.
	The nucleus contains the instructions for protein synthesis by the ribosomes.
	All of the proteins of the cell are synthesized on ribosomes bound on the nuclear envelope.
	The first two answers are correct.
	The first three answers are correct.

	Most of the phospholipids of the endomembrane system are synthesized in the endoplasmic reticulum.
	Direct physical contact among all the organelles of the endomembrane system is needed to permit movement of lipid and protein components among the organelles.
	The Golgi apparatus functions in the modification and sorting of lipids and proteins.
	Proteins that will be secreted from the cell are likely to be found in closed spaces bounded by membranes of the endomembrane system.
	Small vesicles are important to the endomembrane system.

	The membrane of the food vacuole is derived from the plasma membrane.
	Enzymes for the breakdown of the food are delivered to the food vacuole from the cytoplasm.
	Digestion of the food particle occurs in a vesicle with a membrane that separates the digestion from the cytoplasm.
	Proteins for digestion of the food are made by ribosomes in the rough endoplasmic reticulum.
	Proteins for digestion of the food particle were initially processed in the Golgi apparatus.

	all cells
	animal cells only
	plant cells only
	both plant and animal cells
	animal cells and bacterial cells, but not in plant cells

	the beating of cilia or flagella
	maintaining the position of the nucleus in the cell
	determining which proteins are synthesized by the cell
	the contraction of muscle cells in animals
	determining the shape of animal cells

	Some extracellular structures can play a role in determining cell shape.
	Some extracellular structures provide for cytoplasmic connections between adjacent cells.
	Extracellular structures are barriers that prevent small molecules from entering or leaving the cell.
	Proteins and carbohydrates are common components of extracellular structures.
	Information can be transmitted from these extracellular structures to the cytoplasm.

	mitochondrion ... photosynthesis
	nucleus ... cellular respiration
	ribosome ... manufacture of lipids
	lysosome ... movement
	central vacuole ... storage

	Organelles can only function for a short time independently from the rest of the cell.
	Not every type of organelle is present in every cell.
	The membranes of the endomembrane system all have a common site of membrane and protein synthesis.
	Each organelle is responsible for a unique set of functions in the cell.
	In a functioning cell, organelles are not independent of each other.