Straighterline Micro 250 Final Exam Prep Latest
Update 2024 -2025 Actual Exam Questions with
Correct Verified Answers/ Graded A+
The purpose of staining cells on a microscope slide is to ______.
Select one:
a. kill them
b. secure them to the slide
c. enlarge the cells
d. add contrast to see them better
e. observe motility - Correct Answer - add contrast to see them better
Many chronic infections are caused by microbes that associate in communities termed
______.
Select one:
a. biofilms
b. virions
c. sediments
d. microbiota - Correct Answer – biofilms
Microorganisms are best defined as organisms that
Select one:
a. cause human disease.
b. lack a cell nucleus.
c. are infectious particles.
d. are too small to be seen with the unaided eye.
pg. 1
, e. can only be found growing in laboratories. - Correct Answer - are too small to be
seen with the unaided eye.
Studies of the immune response to an infection caused by microorganisms would be
performed by a(n) ______.
Select one:
a. hypersensitivity specialist
b. epidemiologist
c. immunologist
d. geomicrobiologist - Correct Answer - immunologist
Robert Koch and his colleagues first used agar in bacteriological media. Why was this
ingredient an improvement on previous materials used to culture bacteria?
Select one:
a. Bacteria growing on the solidified medium did not degrade or break down the agar.
b. Agar can convert from liquid to solid form, and back again, very easily.
c. Agar was less expensive than the nutrients that Koch was previously using in the lab.
d. Agar is a complete source of nutrients for most bacteria. - Correct Answer - Bacteria
growing on the solidified medium did not degrade or break down the agar.
An example of an amphipathic molecule found in living cells is ______.
Select one:
a. glucose
b. phospholipid
c. protein
d. nucleic acid
e. ATP - Correct Answer - phospholipid
A diagram of the three domains (Bacteria, Archaea, Eukarya) proceeding from the Last
Universal Common Ancestor would show Archaea
pg. 2
,Select one:
a. as the original cells from which the others derived.
b. branching off the Domain Eukarya.
c. branching off the Domain Bacteria. - Correct Answer - branching off the Domain
Eukarya
An atom has gained an electron; it has been ______.
Select one:
a. oxidized
b. reduced
c. ionized
d. deionized
e. neutralized - Correct Answer - reduced
Analysis of the small subunit rRNAs from all organisms in the three current domains
suggests that
Select one:
a. the eukaryotes arose from prokaryotes.
b. the Archaea are more closely related to bacteria than eukaryotes.
c. all modern and extinct organisms on earth arose from a common ancestor.
d. the prokarytoes, archaea, and eukaryotes are not related. - Correct Answer - c. all
modern and extinct organisms on earth arose from a common ancestor.
Most biochemical macromolecules are polymers, which are chains of ______.
Select one:
a. hydrophobic molecules
b. electrolytic molecules
c. repeating monomers
d. repeating carbohydrates
pg. 3
, e. hydrogen bonds - Correct Answer - repeating monomers
A nutrient medium that contains at least one ingredient that is not chemically defined is
termed ______.
Select one:
a. complex
b. reducing
c. enriched
d. synthetic - Correct Answer - complex
One nucleotide contains one
Select one:
a. phosphate.
b. pentose sugar.
c. nitrogen base.
d. All of the choices are correct. - Correct Answer - All of the choices are correct.
Characteristics shared by all cells include
Select one:
a. a membrane serving as a cell boundary.
b. the possession of genetic information.
c. the presence of cellular fluid.
d. All of the choices are correct. - Correct Answer - All of the choices are correct.
The important solvent associated with living things is ______.
Select one:
a. carbon dioxide
b. sodium chloride
c. ethyl alcohol
pg. 4
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