Bio 250 straighterline Test 1 Prep
Questions All Solved Answers.
Organisms called parasites are ______.
Select one:
a. always harmful to their host
b. the decomposers in ecosystems
c. always viruses
d. free-living - 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 - 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 - 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 - 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 - 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 - 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 - 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. - Answer b. The culture was contaminated.
Disease-causing microorganisms are called ______.
Select one:
a. decomposers
b. bacteria
c. pathogens
d. eukaryotes
e. fermenters - 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 - 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. - 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 - 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. - 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 - Answer a. geomicrobiologist
Questions All Solved Answers.
Organisms called parasites are ______.
Select one:
a. always harmful to their host
b. the decomposers in ecosystems
c. always viruses
d. free-living - 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 - 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 - 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 - 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 - 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 - 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 - 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. - Answer b. The culture was contaminated.
Disease-causing microorganisms are called ______.
Select one:
a. decomposers
b. bacteria
c. pathogens
d. eukaryotes
e. fermenters - 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 - 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. - 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 - 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. - 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 - Answer a. geomicrobiologist
