Bio 250 Straighterline Exam Test 1 Prep
With 100% Correct And Verified Answers
2025-2026, Guaranteed Pass
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
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
With 100% Correct And Verified Answers
2025-2026, Guaranteed Pass
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
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
