Multiple Choice Quiz


1	An organic nutrient essential to an organism's metabolism that cannot be synthesized itself is termed a/an
		A)	trace element
		B)	micronutrient
		C)	growth factor
		D)	essential nutrient


2	The source of the necessary elements of life is
		A)	an inorganic environmental reservoir
		B)	the sun
		C)	rocks
		D)	the air


3	An organism that can synthesize all its required organic components from CO2 using energy from the sun is a
		A)	photoautotroph
		B)	photoheterotroph
		C)	chemoautotroph
		D)	chemoheterotroph


4	An obligate halophile requires high
		A)	pH
		B)	temperature
		C)	salt
		D)	pressure


5	Chemoautotrophs can survive on _______ alone.
		A)	minerals
		B)	CO2
		C)	minerals and CO2
		D)	methane


6	A pathogen would most accurately be described as a
		A)	parasite
		B)	commensal
		C)	saprobe
		D)	symbiont


7	A substance that would be moved by passive transport is
		A)	sugar
		B)	water
		C)	amino acids
		D)	food detritus


8	A cell exposed to a hypertonic environment will ______ by osmosis.
		A)	gain water
		B)	lose water
		C)	neither gain nor lose water
		D)	burst


9	Active transport of a substance across a membrane requires
		A)	a gradient
		B)	the expenditure of ATP
		C)	water
		D)	diffusion


10	Environmental factors such as temperature and pH exert their effect on the ______ of microbial cells.
		A)	membranes
		B)	DNA
		C)	enzymes
		D)	cell wall


11	Psychrophiles would be expected to grow
		A)	in hot springs
		B)	on the human body
		C)	at refrigeration temperatures
		D)	at low pH


12	Superoxide ion is toxic to strict anaerobes because they lack
		A)	catalase
		B)	peroxidase
		C)	dismutase
		D)	oxidase


13	The time required for a cell to undergo binary fission is called the
		A)	exponential growth rate
		B)	growth curve
		C)	generation time
		D)	lag period


14	In a viable plate count, each ______ represents a ______ from the sample population.
		A)	cell, colony
		B)	colony, cell
		C)	hour, generation
		D)	cell, generation


15	During the phase, the rate of new cells being added to the _______ population has slowed down.
		A)	stationary
		B)	death
		C)	lag
		D)	exponential growth

2002 McGraw-Hill Higher Education
Any use is subject to the Terms of Use and Privacy Policy.
McGraw-Hill Higher Education is one of the many fine businesses of The McGraw-Hill Companies.