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...
Bio 250 straighterline test 1 prep
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.
,Bio 250 straighterline test 1 prep
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
,Bio 250 straighterline test 1 prep
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.
, Bio 250 straighterline test 1 prep
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
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