EXAM 2 - BIOS 242 - CHAMBERLAIN
EXAM 2 - BIOS 242 - CHAMBERLAIN – UPDATED Questions with
100% Verified Answers
Chamberlain University-Illinois
BIOS 242
EXAM 2 - BIOS 242 - CHAMBERLAIN
Q1 what is a heterotroph?
A organism that must obtain its carbon in organic form
Q2 what is an autotroph?
A an organism that uses inorganic CO2 as its carbon source
Q3 what is a phototroph?
A microbes that photosynthesize
Q4 what is a chemotroph?
A microbes that gain energy from chemical compounds
Q5 what is the temperature range for the optimal rate of growth for a psychrophile?
A 0-15 degrees Celsius
Q6 what is the temperature range for the optimal rate of growth for a mesophile?
A 20-40 degrees Celsius
Q7 what is the temperature range for the optimal rate of growth for a thermophile?
A 45-80 degrees Celsius
Q8 what does a barophile require for growth?
A high hydrostatic pressure
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,EXAM 2 - BIOS 242 - CHAMBERLAIN
Q9 what is an example of a barophile?
A deep sea microbes live in 1000x atmospheric pressure
Q10 what does a halophile require for growth?
A high concentration of salt (9-25% NaCl)
Q11 what are enzymes?
A biological catalysts that increase the rate of a chemical reaction
Q12 ___ ___ is needed for a reaction to occur
A activation energy
Q13 Determine whether this statement is true: enzymes lower the activation energy
A true
Q14 enzymes act on reactant molecules known as ___
A substrates
Q15 enzymes bind and chemically change substrates into ___
A products
Q16 what is an apoenzyme?
A protein, composed of a sequence of amino acids
Q17 what is required for a holoenzyme?
A cofactors and coenzyme
Q18 cofactors are ___ elements
A inorganic
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, EXAM 2 - BIOS 242 - CHAMBERLAIN
Q19 coenzymes are ___ elements
A organic
Q20 what are cofactos?
A metal ions that activate enzymes
Q21 cofactors help bring the ___ and substrate close together
A active site
Q22 Determine whether this statement is true: cofactors do not directly participate in chemical
reactions with the enzyme
A false
Q23 what the is main function of coenzymes?
A remove a chemical group from one substrate molecule and add it to a substrate
Q24 what is the most important component of coenzymes?
A vitamins
Q25 what are the phases of the growth curve in a bacterial culture?
A lag phase, exponential growth/log phase, stationary growth phase, death phase
Q26 what is the lag phase?
A flat period on the graph when the population appears to not be growing
Q27 what are the reason growth lags?
A 1. newly inoculated cells require a period of adjustment, enlargement, and synthesis 2. the
cells are not multiplying at max rate 3. the population of cells is sparse/dilute that the
sample misses them
Q28 what is the exponential growth/log phase?
Page 3
EXAM 2 - BIOS 242 - CHAMBERLAIN – UPDATED Questions with
100% Verified Answers
Chamberlain University-Illinois
BIOS 242
EXAM 2 - BIOS 242 - CHAMBERLAIN
Q1 what is a heterotroph?
A organism that must obtain its carbon in organic form
Q2 what is an autotroph?
A an organism that uses inorganic CO2 as its carbon source
Q3 what is a phototroph?
A microbes that photosynthesize
Q4 what is a chemotroph?
A microbes that gain energy from chemical compounds
Q5 what is the temperature range for the optimal rate of growth for a psychrophile?
A 0-15 degrees Celsius
Q6 what is the temperature range for the optimal rate of growth for a mesophile?
A 20-40 degrees Celsius
Q7 what is the temperature range for the optimal rate of growth for a thermophile?
A 45-80 degrees Celsius
Q8 what does a barophile require for growth?
A high hydrostatic pressure
Page 1
,EXAM 2 - BIOS 242 - CHAMBERLAIN
Q9 what is an example of a barophile?
A deep sea microbes live in 1000x atmospheric pressure
Q10 what does a halophile require for growth?
A high concentration of salt (9-25% NaCl)
Q11 what are enzymes?
A biological catalysts that increase the rate of a chemical reaction
Q12 ___ ___ is needed for a reaction to occur
A activation energy
Q13 Determine whether this statement is true: enzymes lower the activation energy
A true
Q14 enzymes act on reactant molecules known as ___
A substrates
Q15 enzymes bind and chemically change substrates into ___
A products
Q16 what is an apoenzyme?
A protein, composed of a sequence of amino acids
Q17 what is required for a holoenzyme?
A cofactors and coenzyme
Q18 cofactors are ___ elements
A inorganic
Page 2
, EXAM 2 - BIOS 242 - CHAMBERLAIN
Q19 coenzymes are ___ elements
A organic
Q20 what are cofactos?
A metal ions that activate enzymes
Q21 cofactors help bring the ___ and substrate close together
A active site
Q22 Determine whether this statement is true: cofactors do not directly participate in chemical
reactions with the enzyme
A false
Q23 what the is main function of coenzymes?
A remove a chemical group from one substrate molecule and add it to a substrate
Q24 what is the most important component of coenzymes?
A vitamins
Q25 what are the phases of the growth curve in a bacterial culture?
A lag phase, exponential growth/log phase, stationary growth phase, death phase
Q26 what is the lag phase?
A flat period on the graph when the population appears to not be growing
Q27 what are the reason growth lags?
A 1. newly inoculated cells require a period of adjustment, enlargement, and synthesis 2. the
cells are not multiplying at max rate 3. the population of cells is sparse/dilute that the
sample misses them
Q28 what is the exponential growth/log phase?
Page 3
