Bio 250 straighterline exam with correct answers 2024
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Course
Bio 250 straighterline
Institution
Bio 250 Straighterline
Organisms called parasites are ______.
Select one:
a. always harmful to their host
b. the decomposers in ecosystems
c. always viruses
d. free-living correct answers always harmful to their host
Trees of life that illustrate the phylogenetic relationships of all organisms were traditionally...
Bio 250 straighterline
Organisms called parasites are
.Select
one:
a. always harmful to their
host
b. the decomposers in
ecosystems
c. always
viruses
d. free-living correct answers 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 answers a. morphology;
nucleic acid
sequence
s
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 answers
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
e.
agents.
Enzymes have high-energy bonds between phosphates correct answers
Enzymes
have high-energy bonds between
phosphates
NASA has published a list of criteria for identifying fossil bacteria in samples
from
as Mars,
part of a search for evidence of life. Which of the following is good
evidence for
presence the
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 answers a. Cell
tosize
2 of 0.5
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 answers a. Transport
medium
The orderly arrangement of organisms into a hierarchy of taxa is
called
Select
.a.
one:
classification
b.
identification
c.
nomenclature
d.
experimentation
e. biotechnology correct answers a.
classification
A microbiologist inoculates Staphylococcus aureus into a culture medium.
Following
incubation, both Staphylococcus aureus and Staphylococcus
epidermidis to
determined arebe 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 answers b. The
culture was
contaminate
d.
Disease-causing microorganisms are called
.Select
one:
a.
decomposers
b.
bacteria
c.
pathogens
d.
e. fermenters correct answers c.
eukaryotes
pathogens
Which scientific field is involved in the identification, classification, and
naming of
organisms
?
Select
one:
a.
Nomenclature
b.
c.
Taxonomy
Phylogeny
d.
Pathology
e. Epidemiology correct answers 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
answers
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 answers
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 answers 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 answers a.
geomicrobiologist
The alpha (α) helix is a type of protein
structure.
Select
one:
a.
primary
b.
secondary
c.
d. quaternary correct answers
tertiary
secondary
A nutrient medium that contains at least one ingredient that is not
chemically defined
termed . is
Select
one:
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