A.   TRUE

B.   FALSE

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

B.   they are the basic units of structure and function

C.   a typical adult has trillions of cells

D.   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

A.   conditions are kept within narrow ranges

B.   the endocrine and nervous systems regulate homeostasis

C.   maintains stable conditions within the internal environment

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

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

A.   TRUE

B.   FALSE

A.   TRUE

B.   FALSE

A.   linear proteins are the most common

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

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

D.   composed of repeating units of nucleic acids

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

A.   FALSE

B.   TRUE

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

B.   they work by increasing the activation energy

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

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

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

A.   ribosomes

B.   lysosomes

C.   Golgi apparatus

D.   endoplasmic reticulum

E.   mitochondria

A.   attachment sites for ligands

B.   cell recognition

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

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

A.   ribosomes

B.   peroxisomes

C.   lysosomes

D.   mitochondria

E.   microfilaments