MBIO 3400 Tice Exam 1: CH 6 and 7
Questions & Answers (Grade A+)
What does microbial growth mean? -
correct answer ✅An increase in the number of microbial cells due
to reproduction.
What is a colony? -
correct answer ✅A visible group of cells that arose from a single
parent cell.
What is a biofilm? -
correct answer ✅A complex community of microbes living
together on a surface.
Why do microbes need nutrients? -
correct answer ✅For energy and to build cellular structures.
What elements are most commonly required by microbes? -
correct answer ✅Carbon, hydrogen, oxygen, and nitrogen.
What is an autotroph? -
correct answer ✅An organism that uses CO₂ as its carbon source.
,MBIO 3400 Tice Exam 1: CH 6 and 7
Questions & Answers (Grade A+)
What is a heterotroph? -
correct answer ✅An organism that uses organic compounds as its
carbon source.
What is a phototroph? -
correct answer ✅An organism that gets energy from light.
What is a chemotroph? -
correct answer ✅An organism that gets energy from chemical
compounds.
What is a photoautotroph? -
correct answer ✅Uses light for energy and CO₂ for carbon (plants,
algae, cyanobacteria).
What is a chemoautotroph? -
correct answer ✅Uses chemicals for energy and CO₂ for carbon.
What is a photoheterotroph? -
correct answer ✅Uses light for energy but organic compounds for
carbon.
, MBIO 3400 Tice Exam 1: CH 6 and 7
Questions & Answers (Grade A+)
What is a chemoheterotroph? -
correct answer ✅Uses organic compounds for both energy and
carbon (most microbes, animals).
Why can oxygen be toxic to some microbes? -
correct answer ✅It forms reactive oxygen species that damage
cells.
What are reactive oxygen species (ROS)? -
correct answer ✅Toxic forms of oxygen that can damage proteins,
DNA, and membranes.
What is an obligate aerobe? -
correct answer ✅Requires oxygen to grow.
What is an obligate anaerobe? -
correct answer ✅Oxygen is toxic; cannot grow in its presence.
What is a facultative anaerobe? -
correct answer ✅Can grow with or without oxygen, but grows
better with oxygen.
Questions & Answers (Grade A+)
What does microbial growth mean? -
correct answer ✅An increase in the number of microbial cells due
to reproduction.
What is a colony? -
correct answer ✅A visible group of cells that arose from a single
parent cell.
What is a biofilm? -
correct answer ✅A complex community of microbes living
together on a surface.
Why do microbes need nutrients? -
correct answer ✅For energy and to build cellular structures.
What elements are most commonly required by microbes? -
correct answer ✅Carbon, hydrogen, oxygen, and nitrogen.
What is an autotroph? -
correct answer ✅An organism that uses CO₂ as its carbon source.
,MBIO 3400 Tice Exam 1: CH 6 and 7
Questions & Answers (Grade A+)
What is a heterotroph? -
correct answer ✅An organism that uses organic compounds as its
carbon source.
What is a phototroph? -
correct answer ✅An organism that gets energy from light.
What is a chemotroph? -
correct answer ✅An organism that gets energy from chemical
compounds.
What is a photoautotroph? -
correct answer ✅Uses light for energy and CO₂ for carbon (plants,
algae, cyanobacteria).
What is a chemoautotroph? -
correct answer ✅Uses chemicals for energy and CO₂ for carbon.
What is a photoheterotroph? -
correct answer ✅Uses light for energy but organic compounds for
carbon.
, MBIO 3400 Tice Exam 1: CH 6 and 7
Questions & Answers (Grade A+)
What is a chemoheterotroph? -
correct answer ✅Uses organic compounds for both energy and
carbon (most microbes, animals).
Why can oxygen be toxic to some microbes? -
correct answer ✅It forms reactive oxygen species that damage
cells.
What are reactive oxygen species (ROS)? -
correct answer ✅Toxic forms of oxygen that can damage proteins,
DNA, and membranes.
What is an obligate aerobe? -
correct answer ✅Requires oxygen to grow.
What is an obligate anaerobe? -
correct answer ✅Oxygen is toxic; cannot grow in its presence.
What is a facultative anaerobe? -
correct answer ✅Can grow with or without oxygen, but grows
better with oxygen.
