Microbiology 020 - General Microbiology » Fall 2021 » Microbial Nutrition and Growth

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Question #1
Which of the following is true of passive transport?
A.   It includes endocytosis
B.   It uses the cell wall
C.   It requires a gradient
D.   It only moves water
Question #2
An organism that can synthesize all its required organic components from CO2 using energy from the sun is a _______.
A.   photoautotroph
B.   chemoheterotroph
C.   chemoautotroph
D.   photoheterotroph
Question #3
A pathogen would most accurately be described as a ______.
A.   parasite
B.   symbiont
C.   commensal
D.   saprobe
Question #4
When sugar is mixed with water, equilibrium is reached when _______.
A.   there are the same number of water molecules as dissolved sugar molecules
B.   the dissolved sugar molecules are evenly distributed throughout the solution
C.   two tablespoons of coffee are added
D.   water and sugar molecules are moving at the same speed
E.   molecules of sugar stop moving
Question #5
Simple diffusion is defined as the movement of _______.
A.   gas or water molecules across a membrane
B.   gas molecules across a membrane
C.   molecules from areas of lower concentration to areas of higher concentration
D.   water molecules across a membrane
E.   molecules from areas of higher concentration to areas of lower concentration
Question #6
The rate of diffusion is affected by which of the following?
A.   Temperature and size of molecules
B.   Temperature, size of molecules, and steepness of the concentration gradient
C.   Temperature
D.   Steepness of the concentration gradient
E.   Size of molecules
Question #7
Osmosis is best defined as the movement of _______.
A.   water molecules across a membrane from an area of low water to an area of higher concentration
B.   water molecules inside a container
C.   water molecules across a membrane from an area of high water concentration to an area of lower concentration
D.   molecules from an area of high concentration to an area of lower concentration
E.   molecules from an area of low concentration to an area of higher concentration
Question #8
Which of the following will pass through a cell membrane most easily?
A.   Large polar molecules
B.   Large neutral molecules
C.   Large nonpolar molecules
D.   Small nonpolar molecules
E.   Small polar molecules
Question #9
A red blood cell placed in a hypertonic medium will _______.
A.   expand
B.   become a white blood cell
C.   shrink
D.   burst
E.   have no change in shape

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