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Bio 250 straighterline test 1 prep Questions and Answers 100% Pass

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Straighterline Microbiology

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Straighterline Microbiology

Bio 250 straighterline test 1 prep Questions and Answers 100% Pass 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 ph...

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Publié le 10 décembre 2024
Nombre de pages 42
Écrit en 2024/2025
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Bio 250 straighterline test 1 prep
Questions and Answers 100% Pass

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:

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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

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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.

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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.

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