Bio 250 Straighterline Exam Test 1 Prep
With 100% Correct And Verified Answers
2024-2026
Organisms called parasites are ______.
Select one:
a. always harmful to their host
b. the decomposers in ecosystems
c. always viruses
d. free-living - Correct Answer-always harmful to their host
Trees of life that illustrate the phylogenetic relationships of all organisms
were traditionally based on ______; newer methods for determining
phylogeny rely on ______.
Select one:
a. morphology; nucleic acid sequences
b. nucleic acid sequences; morphology
c. morphology; virology
d. morphology; nutritional requirements
e. nucleic acid sequences; microbiomes - Correct Answer-a. morphology;
nucleic acid sequences
What is the maximum number of electrons in the first energy shell of an
atom?
Select one:
a. 2
b. 4
c. 8
d. 18
e. 32 - Correct Answer-a. 2
Which of the following is not true about enzymes?
Select one:
a. Enzymes are found in all cells.
b. Enzymes are catalysts.
c. Enzymes participate in the cell's chemical reactions.
d. Enzymes can be denaturated by heat and other agents.
e. Enzymes have high-energy bonds between phosphates - Correct Answer-
Enzymes have high-energy bonds between phosphates
NASA has published a list of criteria for identifying fossil bacteria in samples
from Mars, as part of a search for evidence of life. Which of the following is
good evidence for the presence of bacterial cells?
Select one:
a. Cell size of 0.5 to 2 microns
b. Three-dimensional organization of cells in a starburst pattern
, c. Absence of carbon in the material
d. No evidence of water in the surrounding mineral - Correct Answer-a. Cell
size of 0.5 to 2 microns
Which type of medium would be the best choice when shipping a sample of
bacteria from a clinic to a laboratory for testing?
Select one:
a. Transport medium
b. Eosin-methylene blue agar
c. Blood agar
d. Thioglycolate medium - Correct Answer-a. Transport medium
The orderly arrangement of organisms into a hierarchy of taxa is called
______.
Select one:
a. classification
b. identification
c. nomenclature
d. experimentation
e. biotechnology - Correct Answer-a. classification
A microbiologist inoculates Staphylococcus aureus into a culture medium.
Following incubation, both Staphylococcus aureus and Staphylococcus
epidermidis are determined to be growing in this culture. What is the most
likely explanation?
Select one:
a. The microbiologist used too much inoculum.
b. The culture was contaminated.
c. The incubation temperature was incorrect.
d. The culture medium was selective.
e. The culture medium was differential. - Correct Answer-b. The culture was
contaminated.
Disease-causing microorganisms are called ______.
Select one:
a. decomposers
b. bacteria
c. pathogens
d. eukaryotes
e. fermenters - Correct Answer-c. pathogens
Which scientific field is involved in the identification, classification, and
naming of organisms?
Select one:
a. Nomenclature
b. Taxonomy
, Bio 250 Straighterline Exam Test 1 Prep
With 100% Correct And Verified Answers
2024-2026
c. Phylogeny
d. Pathology
e. Epidemiology - Correct Answer-b. Taxonomy
Covalent bonds
Select one:
a. result from losing electrons.
b. are always polar.
c. are always nonpolar.
d. result from sharing electrons.
e. result from gaining electrons. - Correct Answer-
Using microbes to detoxify a site contaminated with heavy metals is an
example of ______.
Select one:
a. biotechnology
b. bioremediation
c. decomposition
d. immunology
e. epidemiology - Correct Answer-bioremediation
Which of the following statements is incorrect regarding protein structure?
Select one:
a. The interaction between various R groups of amino acids determines the
primary structure of a protein.
b. Beta-pleated sheets are a type of protein secondary structure.
c. The folding of a protein to form its active site creates its tertiary structure.
d. Proteins, such as antibodies that are comprised of multiple polypeptide
chains, have quaternary structure. - Correct Answer-a. The interaction
between various R groups of amino acids
A scientist who studies the influence of microbes in the formation of caves is
called a(n) ______.
Select one:
a. geomicrobiologist
b. astrobiologist
c. epidemiologist
d. immunologist - Correct Answer-a. geomicrobiologist
The alpha (α) helix is a type of _____ protein structure.
Select one:
a. primary
With 100% Correct And Verified Answers
2024-2026
Organisms called parasites are ______.
Select one:
a. always harmful to their host
b. the decomposers in ecosystems
c. always viruses
d. free-living - Correct Answer-always harmful to their host
Trees of life that illustrate the phylogenetic relationships of all organisms
were traditionally based on ______; newer methods for determining
phylogeny rely on ______.
Select one:
a. morphology; nucleic acid sequences
b. nucleic acid sequences; morphology
c. morphology; virology
d. morphology; nutritional requirements
e. nucleic acid sequences; microbiomes - Correct Answer-a. morphology;
nucleic acid sequences
What is the maximum number of electrons in the first energy shell of an
atom?
Select one:
a. 2
b. 4
c. 8
d. 18
e. 32 - Correct Answer-a. 2
Which of the following is not true about enzymes?
Select one:
a. Enzymes are found in all cells.
b. Enzymes are catalysts.
c. Enzymes participate in the cell's chemical reactions.
d. Enzymes can be denaturated by heat and other agents.
e. Enzymes have high-energy bonds between phosphates - Correct Answer-
Enzymes have high-energy bonds between phosphates
NASA has published a list of criteria for identifying fossil bacteria in samples
from Mars, as part of a search for evidence of life. Which of the following is
good evidence for the presence of bacterial cells?
Select one:
a. Cell size of 0.5 to 2 microns
b. Three-dimensional organization of cells in a starburst pattern
, c. Absence of carbon in the material
d. No evidence of water in the surrounding mineral - Correct Answer-a. Cell
size of 0.5 to 2 microns
Which type of medium would be the best choice when shipping a sample of
bacteria from a clinic to a laboratory for testing?
Select one:
a. Transport medium
b. Eosin-methylene blue agar
c. Blood agar
d. Thioglycolate medium - Correct Answer-a. Transport medium
The orderly arrangement of organisms into a hierarchy of taxa is called
______.
Select one:
a. classification
b. identification
c. nomenclature
d. experimentation
e. biotechnology - Correct Answer-a. classification
A microbiologist inoculates Staphylococcus aureus into a culture medium.
Following incubation, both Staphylococcus aureus and Staphylococcus
epidermidis are determined to be growing in this culture. What is the most
likely explanation?
Select one:
a. The microbiologist used too much inoculum.
b. The culture was contaminated.
c. The incubation temperature was incorrect.
d. The culture medium was selective.
e. The culture medium was differential. - Correct Answer-b. The culture was
contaminated.
Disease-causing microorganisms are called ______.
Select one:
a. decomposers
b. bacteria
c. pathogens
d. eukaryotes
e. fermenters - Correct Answer-c. pathogens
Which scientific field is involved in the identification, classification, and
naming of organisms?
Select one:
a. Nomenclature
b. Taxonomy
, Bio 250 Straighterline Exam Test 1 Prep
With 100% Correct And Verified Answers
2024-2026
c. Phylogeny
d. Pathology
e. Epidemiology - Correct Answer-b. Taxonomy
Covalent bonds
Select one:
a. result from losing electrons.
b. are always polar.
c. are always nonpolar.
d. result from sharing electrons.
e. result from gaining electrons. - Correct Answer-
Using microbes to detoxify a site contaminated with heavy metals is an
example of ______.
Select one:
a. biotechnology
b. bioremediation
c. decomposition
d. immunology
e. epidemiology - Correct Answer-bioremediation
Which of the following statements is incorrect regarding protein structure?
Select one:
a. The interaction between various R groups of amino acids determines the
primary structure of a protein.
b. Beta-pleated sheets are a type of protein secondary structure.
c. The folding of a protein to form its active site creates its tertiary structure.
d. Proteins, such as antibodies that are comprised of multiple polypeptide
chains, have quaternary structure. - Correct Answer-a. The interaction
between various R groups of amino acids
A scientist who studies the influence of microbes in the formation of caves is
called a(n) ______.
Select one:
a. geomicrobiologist
b. astrobiologist
c. epidemiologist
d. immunologist - Correct Answer-a. geomicrobiologist
The alpha (α) helix is a type of _____ protein structure.
Select one:
a. primary
