LSU ENVS 2126 TEST 1 LOMNICKI
QUESTIONS AND CORRECT
ANSWERS
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. ANSW✅✅sterols / hopanoids
The cytoplasmic membrane could best be described as ANSW✅✅a highly selective permeability
barrier
Which is/are a function(s) of the cytoplasmic membrane in prokaryotes? ANSW✅✅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? ANSW✅✅Flagella can rotate
360 degrees.
Taxis is ANSW✅✅movement towards or away from a stimulus.
Which of the following terms refers to a bacterium moving towards a light source?
ANSW✅✅Positive phototaxis
As a bacterium approaches a food source, one would expect ANSW✅✅runs to become more
frequent.
Why are receptors on the cell surface necessary for bacterial movement? ANSW✅✅The receptors
sense the stimulus and send signals to the flagella.
Transport proteins located in the cytoplasmic membrane are necessary when ANSW✅✅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? ANSW✅✅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 ANSW✅✅chemoreceptor.
Hydrolytic enzymes function in the ANSW✅✅initial degradation of nutrients.
Microbes that live at high temperatures in hot springs are ________. ANSW✅✅extremophiles
Actin is found within ________. ANSW✅✅eukaryotic microfilaments
Biological catalysts involved in the acceleration of the rate of chemical reactions are called
ANSW✅✅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 ANSW✅✅peptidoglycan
Although the inner leaflet of the gram-negative outer membrane is composed mainly of
phospholipids, the outer leaflet of the outer membrane contains ANSW✅✅lipopolysaccharides
(LPS)
Archaeans have archaella that rotate like bacterial flagella though they ANSW✅✅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 ANSW✅✅most likely an archaeon
All eukaryotes contain ANSW✅✅a membrane-enclosed nucleus.
Bioremediation ________ by introducing pollutant-consuming microorganisms or specific nutrients
that help microorganisms degrade pollutants. ANSW✅✅accelerates the natural cleanup process
Bacillus anthracis deficient in its ability to differentiate would not be able to ANSW✅✅form
endospores.
QUESTIONS AND CORRECT
ANSWERS
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. ANSW✅✅sterols / hopanoids
The cytoplasmic membrane could best be described as ANSW✅✅a highly selective permeability
barrier
Which is/are a function(s) of the cytoplasmic membrane in prokaryotes? ANSW✅✅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? ANSW✅✅Flagella can rotate
360 degrees.
Taxis is ANSW✅✅movement towards or away from a stimulus.
Which of the following terms refers to a bacterium moving towards a light source?
ANSW✅✅Positive phototaxis
As a bacterium approaches a food source, one would expect ANSW✅✅runs to become more
frequent.
Why are receptors on the cell surface necessary for bacterial movement? ANSW✅✅The receptors
sense the stimulus and send signals to the flagella.
Transport proteins located in the cytoplasmic membrane are necessary when ANSW✅✅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? ANSW✅✅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 ANSW✅✅chemoreceptor.
Hydrolytic enzymes function in the ANSW✅✅initial degradation of nutrients.
Microbes that live at high temperatures in hot springs are ________. ANSW✅✅extremophiles
Actin is found within ________. ANSW✅✅eukaryotic microfilaments
Biological catalysts involved in the acceleration of the rate of chemical reactions are called
ANSW✅✅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 ANSW✅✅peptidoglycan
Although the inner leaflet of the gram-negative outer membrane is composed mainly of
phospholipids, the outer leaflet of the outer membrane contains ANSW✅✅lipopolysaccharides
(LPS)
Archaeans have archaella that rotate like bacterial flagella though they ANSW✅✅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 ANSW✅✅most likely an archaeon
All eukaryotes contain ANSW✅✅a membrane-enclosed nucleus.
Bioremediation ________ by introducing pollutant-consuming microorganisms or specific nutrients
that help microorganisms degrade pollutants. ANSW✅✅accelerates the natural cleanup process
Bacillus anthracis deficient in its ability to differentiate would not be able to ANSW✅✅form
endospores.
