A.   TRUE

B.   FALSE

A.   they are the basic units of structure and function, a typical adult has trillions of cells, all cells are anatomically and physiologically similar and many cells are specialized for a particular function

B.   all cells are anatomically and physiologically similar and many cells are specialized for a particular function

C.   a typical adult has trillions of cells

D.   they are the basic units of structure and function

A.   the internal environment refers to the fluids inside the cells

B.   conditions include pH, temperature, and the concentrations of nutrients, electrolytes and gases

C.   the endocrine and nervous systems regulate homeostasis

D.   conditions are kept within narrow ranges

E.   maintains stable conditions within the internal environment

A.   FALSE

B.   TRUE

A.   FALSE

B.   TRUE

A.   primary structure refers to how a chain folds on itself

B.   linear proteins are the most common

C.   their functions include enzymes, buffers, and production of movement

D.   composed of repeating units of nucleic acids

E.   consists of the elements C, H, O, N and phosphorus

A.   FALSE

B.   TRUE

A.   enzyme activity is proportional to the temperature, up until 40° C

B.   the shape of the active site must match the shape of the substrate

C.   enzyme activity is proportional to the substrate concentration up until the saturation point

D.   most enzymes work best between a pH of 7.3 and 7.4

E.   they work by increasing the activation energy

A.   ribosomes

B.   mitochondria

C.   Golgi apparatus

D.   endoplasmic reticulum

E.   lysosomes

A.   attachment sites for ligands

B.   attachment sites for ligands, cell recognition, enzymes and transport of materials into or out of the cell

C.   enzymes and transport of materials into or out of the cell

D.   cell recognition

A.   peroxisomes

B.   ribosomes

C.   lysosomes

D.   mitochondria

E.   microfilaments