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ASU MIC 205 PENTON EXAM 2 NEWEST ACTUAL EXAM QUESTIONS AND DETAILED CORRECT ANSWERS | A+ GRADE
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ASU MIC 205 PENTON EXAM 2 NEWEST ACTUAL EXAM QUESTIONS AND DETAILED CORRECT ANSWERS | A+ GRADE
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ASU MIC 205 PENTON EXAM 2 NEWESTACTUAL EXAM QUESTIONS AND
DETAILED CORRECT ANSWERS | A+
GRADE 2024-2025
Why isn't there just one type of bacteria? Correct Answer
Mutations. They can happen very rapidly.
How do bacteria change (ex develop a resistance to
antibiotics? Correct Answer Mutations happen very
rapidly, this is how bacteria create resistance to
antibiotics, 1 million e coli, 20,000 mutations per day.
Some mutations may cause the death of a cell.
A change in the nucleotide base sequence of a genome
is? Correct Answer Rare and almost always bad news. It
rarely leads to a protein having a property that improves
the ability of an organism and its descendants to survive
and reproduce.
Staph's beta-lactamase gene is an example of a what
mutation? Correct Answer Advantageous mutation
Silent mutation Correct Answer - no change in the protein,
third base in the code "wobble base" changes the most
and doesn't change the protein
Missense mutation middle base Correct Answer may or
may not change the protein or the function
,Nonsense mutation Correct Answer stop codone, negative
because it will stop coding
Readthrough Correct Answer changes a stop codone to
any other amino acid and will change the protein because
it is adding more amino acids
Frameshift mutation Correct Answer Most drastic.
Happens with insertions or deletions; all amino acids will
change the protein
Mutant Correct Answer If a cell cannot repair damage
Wild type Correct Answer Is typically found in nature, does
not have mutation
Positive selection Correct Answer the selection of mutants
by eliminating the wild type phenotypes, could eventually
become the new wild type
Transduction Correct Answer Transfer of DNA from one
cell to another via a replicating virus (bacteriophage)
Transformation Correct Answer When a recipient cell
takes up DNA from the environment (such as DNA
released from a dead organism). Complement cells can
take up naked DNA through pores on the bacterial cells.
Conjugation Correct Answer pilli
, Who developed the process of transformation? Correct
Answer 1928 Frederick Griffith when he was trying to
develop a vaccine for pneumonia caused by streptococcus
pneumoniae.
S strain Correct Answer has a protective capsule and
caused deadly pneumonia when injected into mice. S for
smooth, capsule helps with identification, desiccation, and
phagocytosis.
R strain Correct Answer Mutants of the S strain that can
not make the protective capsule and did not cause deadly
disease. The white blood cells of the mice could easily
destroy them.
What must a pathogen do in order to cause disease?
Correct Answer 1. Gain access to the body
2. Attach to and or enter cells of its host (receptors on
pathogen must fit, lock-and-key, with receptors sites on
host cell)
3. Reproduce while avoiding host's immune system long
enough to produce harmful changes
Where is it the easiest for a pathogen to cause disease?
Correct Answer Respiratory tract or a wound
Normal flora (microbiota) Correct Answer Protect the body
by competing with potential pathogens. This is called
microbial antagonism.
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