A.   TRUE

B.   FALSE

A.   a typical adult has trillions of cells

B.   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

C.   they are the basic units of structure and function

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

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

B.   the endocrine and nervous systems regulate homeostasis

C.   maintains stable conditions within the internal environment

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

E.   conditions are kept within narrow ranges

A.   TRUE

B.   FALSE

A.   FALSE

B.   TRUE

A.   linear proteins are the most common

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

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

D.   composed of repeating units of nucleic acids

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

A.   TRUE

B.   FALSE

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

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

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

D.   they work by increasing the activation energy

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

A.   endoplasmic reticulum

B.   mitochondria

C.   Golgi apparatus

D.   ribosomes

E.   lysosomes

A.   attachment sites for ligands

B.   cell recognition

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

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

A.   peroxisomes

B.   mitochondria

C.   ribosomes

D.   lysosomes

E.   microfilaments