Chapter 6 micro

Which compound has the highest concentration in a cell?

• CO2

• CH4

• H2O

• Glucose

• NH3

Most of the dry weight of a microbial cell is from ______.

• inorganic compounds

• minerals

• water

• organic compounds

• salts

Which of the following is not a major element of a microbial cell?

• Copper

• Carbon

• Hydrogen

• Nitrogen

• Oxygen

An organic nutrient that cannot be synthesized by the organism and must be provided is called a/an ______.

• element

• macronutrient

• compound

• growth factor

• trace element

Calcium is required for bacteria because it ______.

• stabilizes the cell wall

• stabilizes the ribosomes

• stabilizes the nucleoid

• maintains cellular pH

• makes strong cell walls

Growth factors ______.

• are inorganic

• are synthesized by the organism

• contain elemental oxygen

• cannot be synthesized by the organism

• All of the choices are correct.

Microorganisms require large quantities of ______ for use in cell structure and metabolism.

• electrolytes

• macronutrients

• water

• growth factors

• trace elements

Microorganisms require small quantities of ______ for enzyme function and maintenance of protein structure.

• electrolytes

• macronutrients

• water

• growth factors

• trace elements

An important mineral ion found in the cytochrome pigments of cellular respiration is ______.

• iron

• zinc

• calcium

• magnesium

• potassium

An important mineral ion that is a component of chlorophyll and serves as a stabilizer of membranes and ribosomes is ______.

• iron

• zinc

• calcium

• magnesium

• potassium