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

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