LSU ENVS 2126 Test 1 Lomnicki Latest
complete set with Questions and correct
verified Answers
Actin is found within ________. - correct answer- ✅eukaryotic microfilaments
Biological catalysts involved in the acceleration of the rate of chemical reactions are called -
correct answer- ✅enzymes
The rigid layer that is present in the cell walls of Bacteria that is primarily responsible for the
strength of the wall is known as - correct answer- ✅peptidoglycan
Although the inner leaflet of the gram-negative outer membrane is composed mainly of
phospholipids, the outer leaflet of the outer membrane contains - correct answer-
✅lipopolysaccharides (LPS)
Archaeans have archaella that rotate like bacterial flagella though they - correct answer-
✅consist of multiple protein types
You have discovered a new coccoid-shaped microorganism with no nucleus, a rigid cell wall,
and a diameter of 2 μm. Chemical tests reveal that its cell wall does NOT contain peptidoglycan.
The new microorganism is - correct answer- ✅most likely an archaeon
Eukaryotes have ________ in their cytoplasmic membranes, which serve to strengthen and
stabilize the membrane and make it less flexible. Many bacteria have similar molecules, known
as ________, in their cytoplasmic membranes that have a similar role. - correct answer-
✅sterols / hopanoids
The cytoplasmic membrane could best be described as - correct answer- ✅a highly selective
permeability barrier
Which is/are a function(s) of the cytoplasmic membrane in prokaryotes? - correct answer- ✅It
serves as a permeability barrier, a docking station for proteins involved in bioenergetics
reactions and transport, and a site for energy conservation.
Which of the following statements about bacterial flagella is true? - correct answer- ✅Flagella
can rotate 360 degrees.
Taxis is - correct answer- ✅movement towards or away from a stimulus.
Which of the following terms refers to a bacterium moving towards a light source? - correct
answer- ✅Positive phototaxis
As a bacterium approaches a food source, one would expect - correct answer- ✅runs to
become more frequent.
Why are receptors on the cell surface necessary for bacterial movement? - correct answer-
✅The receptors sense the stimulus and send signals to the flagella.
, Transport proteins located in the cytoplasmic membrane are necessary when - correct answer-
✅nutrient concentration is very low in the environment, is higher inside of the cell, or diffusion is
not possible.
Which of the following statements is TRUE? - correct answer- ✅Fimbriae are usually shorter
than flagella whereas pili are involved in genetic exchange.
One of the many types of proteins found in the cytoplasmic membrane is involved in the
chemotactic response and is called a - correct answer- ✅chemoreceptor.
Hydrolytic enzymes function in the - correct answer- ✅initial degradation of nutrients.
Microbes that live at high temperatures in hot springs are ________. - correct answer-
✅extremophiles
All eukaryotes contain - correct answer- ✅a membrane-enclosed nucleus.
Bioremediation ________ by introducing pollutant-consuming microorganisms or specific
nutrients that help microorganisms degrade pollutants. - correct answer- ✅accelerates the
natural cleanup process
Bacillus anthracis deficient in its ability to differentiate would not be able to - correct answer-
✅form endospores.
Compared to Eukaryotes, Bacteria and Archaea have ________ surface-to-volume ratios,
causing ________ nutrient exchange. - correct answer- ✅higher / higher
Where within a eukaryotic cell is ribosomal RNA (rRNA) synthesized? - correct answer-
✅nucleolus
Which of the following statements is correct? - correct answer- ✅Microorganisms are
significant contributors to the total biomass on Earth.
A microbial cell's membrane is considered ________, because its internal constituents are
maintained within the cell. However, it also imports and exports other molecules in response to
its environment. - correct answer- ✅semipermeable
Which of the following statements is TRUE? - correct answer- ✅Eukaryotic flagella do not
rotate in the same manner as prokaryotic flagella.
Bacteria stain as gram-positive or gram-negative because of differences in the cell - correct
answer- ✅wall
What is the biological function of endospores? - correct answer- ✅They enable organisms to
endure extremes of temperature, drying, and nutrient depletion.
Some archaea have unique phospholipids in their cytoplasmic membrane that - correct answer-
✅form a monolayer due to the presence of diglycerol tetraethers.
While examining cellular material, you find that organelle DNA is present. What organelle(s)
must be within the sample? - correct answer- ✅chloroplasts or mitochondria
The structure that confers structural strength on the cell is known as the - correct answer- ✅cell
wall
complete set with Questions and correct
verified Answers
Actin is found within ________. - correct answer- ✅eukaryotic microfilaments
Biological catalysts involved in the acceleration of the rate of chemical reactions are called -
correct answer- ✅enzymes
The rigid layer that is present in the cell walls of Bacteria that is primarily responsible for the
strength of the wall is known as - correct answer- ✅peptidoglycan
Although the inner leaflet of the gram-negative outer membrane is composed mainly of
phospholipids, the outer leaflet of the outer membrane contains - correct answer-
✅lipopolysaccharides (LPS)
Archaeans have archaella that rotate like bacterial flagella though they - correct answer-
✅consist of multiple protein types
You have discovered a new coccoid-shaped microorganism with no nucleus, a rigid cell wall,
and a diameter of 2 μm. Chemical tests reveal that its cell wall does NOT contain peptidoglycan.
The new microorganism is - correct answer- ✅most likely an archaeon
Eukaryotes have ________ in their cytoplasmic membranes, which serve to strengthen and
stabilize the membrane and make it less flexible. Many bacteria have similar molecules, known
as ________, in their cytoplasmic membranes that have a similar role. - correct answer-
✅sterols / hopanoids
The cytoplasmic membrane could best be described as - correct answer- ✅a highly selective
permeability barrier
Which is/are a function(s) of the cytoplasmic membrane in prokaryotes? - correct answer- ✅It
serves as a permeability barrier, a docking station for proteins involved in bioenergetics
reactions and transport, and a site for energy conservation.
Which of the following statements about bacterial flagella is true? - correct answer- ✅Flagella
can rotate 360 degrees.
Taxis is - correct answer- ✅movement towards or away from a stimulus.
Which of the following terms refers to a bacterium moving towards a light source? - correct
answer- ✅Positive phototaxis
As a bacterium approaches a food source, one would expect - correct answer- ✅runs to
become more frequent.
Why are receptors on the cell surface necessary for bacterial movement? - correct answer-
✅The receptors sense the stimulus and send signals to the flagella.
, Transport proteins located in the cytoplasmic membrane are necessary when - correct answer-
✅nutrient concentration is very low in the environment, is higher inside of the cell, or diffusion is
not possible.
Which of the following statements is TRUE? - correct answer- ✅Fimbriae are usually shorter
than flagella whereas pili are involved in genetic exchange.
One of the many types of proteins found in the cytoplasmic membrane is involved in the
chemotactic response and is called a - correct answer- ✅chemoreceptor.
Hydrolytic enzymes function in the - correct answer- ✅initial degradation of nutrients.
Microbes that live at high temperatures in hot springs are ________. - correct answer-
✅extremophiles
All eukaryotes contain - correct answer- ✅a membrane-enclosed nucleus.
Bioremediation ________ by introducing pollutant-consuming microorganisms or specific
nutrients that help microorganisms degrade pollutants. - correct answer- ✅accelerates the
natural cleanup process
Bacillus anthracis deficient in its ability to differentiate would not be able to - correct answer-
✅form endospores.
Compared to Eukaryotes, Bacteria and Archaea have ________ surface-to-volume ratios,
causing ________ nutrient exchange. - correct answer- ✅higher / higher
Where within a eukaryotic cell is ribosomal RNA (rRNA) synthesized? - correct answer-
✅nucleolus
Which of the following statements is correct? - correct answer- ✅Microorganisms are
significant contributors to the total biomass on Earth.
A microbial cell's membrane is considered ________, because its internal constituents are
maintained within the cell. However, it also imports and exports other molecules in response to
its environment. - correct answer- ✅semipermeable
Which of the following statements is TRUE? - correct answer- ✅Eukaryotic flagella do not
rotate in the same manner as prokaryotic flagella.
Bacteria stain as gram-positive or gram-negative because of differences in the cell - correct
answer- ✅wall
What is the biological function of endospores? - correct answer- ✅They enable organisms to
endure extremes of temperature, drying, and nutrient depletion.
Some archaea have unique phospholipids in their cytoplasmic membrane that - correct answer-
✅form a monolayer due to the presence of diglycerol tetraethers.
While examining cellular material, you find that organelle DNA is present. What organelle(s)
must be within the sample? - correct answer- ✅chloroplasts or mitochondria
The structure that confers structural strength on the cell is known as the - correct answer- ✅cell
wall
