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All membranes are mainly composed of a molecule called __________________. 

The sodium-potassium pump transports sodium and potassium ions into and out of the cell. It is an example of what type of membrane protein?

List 2 factors that increase the fluidity of membranes. 

Beside pH, what is the other environmental factor that affects the function of enzymes?

The sodium-potassium pump transports sodium and potassium ions into and out of the cell. It is an example of what type of membrane protein?

Which cytoskeletal element in eukaryotes are composed of actin proteins and functions in cell mobility and help determine cell shape?

Each subunit of the ribosome is composed of:

Cells are small because:

Each subunit of the ribosome is composed of:

Label the structures indicated by an arrow. A. _______________ B. _______________