BIOL 250 exam 2 questions and answers
complete solution 2024
f bacteria living in salty seawater were displaced to a freshwater environment, the cell structure that
would prevent the cells from rupturing is the ______.
NOT *endospore*
BIOL 250 exam 2 questions and answers
complete solution 2024
f bacteria living in salty seawater were displaced to a freshwater environment, the cell structure that
would prevent the cells from rupturing is the ______.
NOT *endospore*
The transfer of genes during bacterial conjugation involves rigid, tubular appendages called ______.
NOT *flagella*
We have an expert-written solution to this problem!
A nutrient binds to receptors near the flagellar basal body. This will result in _______.
d. counterclockwise rotation of flagella
The chemical components of ribosomes are proteins and ______.
rRNA
The cytoskeleton _______.
c. All of the choices are correct.
As part of their reproductive cycle, helminths produce egg and sperm cells. Both of these eukaryotic
cell types have an outer surface composed of polysaccharides known as the ______.
glycocalyx
Which pairis mismatched?
,d. Plasmodium - causes Chagas disease
The envelope of enveloped viruses _______.
e. is obtained by viral budding or exocytosis
Diagnosis of viral infections sometimes involves analyzing the patient's blood for specific _____ that
the immune system produces against the virus.
antibodies
We have an expert-written solution to this problem!
How are viroids transmitted?
plant seeds
The movement of substances from higher to lower concentration across a semipermeable
membrane via a specific protein carrier but without energy expenditure is called ______.
facilitated diffusion
We have an expert-written solution to this problem!
All of the following could find a location in or on human body tissues suitable for growth except
______.
psychrophiles
Nutrient absorption is mediated by the ______.
cell membrane
,The term facultative refers to _______.
the ability to exist in a wide range of conditions
The phase of the bacterial growth curve that shows the maximum rate of cell division is the ______.
exponential phase
What is the difference between mutualism and synergism?
NOT *a. In a mutualistic relationship, both organisms benefit, but in a synergistic relationship both
organisms are harmed.*
The toxic superoxide ion is converted to harmless oxygen by two enzymes, _______.
d. superoxide dismutase and catalase
The unknown bacterium that you are testing makes the enzyme phenyalanine deaminase, as
indicated by the results of aphenylalanine test. This enzyme facilitates the removal of a/an______
group from the organic compound so it can be converted into an intermediate compound for the
Krebs cycle.
amino
When the product of reaction A becomes the reactant of reaction B, this exemplifies a _______
metabolic pathway.
linear
Which of the following is not true of anaerobic respiration?
b. It uses the same final electron acceptor as aerobic respiration.
, When glucose is broken down by glycolysis during bacterial fermentation, what is the usual net
production of ATP?
2
The mechanism of DNA synthesis differs between the two new daughter strands during replication.
This is due to the fact that _______.
d. the DNA strands run antiparallel to each other and the DNA polymerase can only add nucleotides
to the 3' end of the growing strand
Which is incorrect about purines?
c. They are only found in DNA, not in RNA.
A screening system called the _______ test is used for detecting chemicals with carcinogenic
potential.
A screening system called the _______ test is used for detecting chemicals with carcinogenic
potential.
In Griffith's experiments with Streptococcus pneumoniae, rough nonencapsulated streptococci were
converted into smooth encapsulated streptococci in the presence of the heat-killed smooth
encapsulated streptococci. Which microbial process had Griffith identified?
transformation
Erythromcycin, a macrolide, inhibits protein synthesis _______.
b. by binding to the ribosome, preventing translocation due to interference with the attachment of
mRNA
Transgenic organisms are ______.
patented
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