1. What determines if a bacterial cell is Gram-positive or Gram-negative?
The structure of a cell wall determines whether the cell is Gram-positive or Gramnegative The cell walls of Gram-positive bacteria are made up of thick layers of
peptidoglycan. When Gram positive cells are treated to a Gram...
straighterline bio 250l lab 3 structure amp microscopy 2022
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Lab 3 Structure & Microscopy BIO250L
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Pre-Lab Questions
1. What determines if a bacterial cell is Gram-positive or Gram-negative?
The structure of a cell wall determines whether the cell is Gram-positive or Gram-
negative The cell walls of Gram-positive bacteria are made up of thick layers of
peptidoglycan. When Gram positive cells are treated to a Gram stain technique, they
turn purple. Gram negative bacteria have a thin coat of peptidoglycan on their cell walls
2. In this lab, both viruses and prions were introduced as acellular organisms. Do some research
and describe one other type of acellular organism. What characteristics about this organism
classify it as acellular?
Viroids are another sort of acellular creature. Viroids are the tiniest pathogens, consisting
only just a single strand of RNA and no protein covering. Viroids, like prions and viruses,
are categorised as acellular because they lack all of the necessary properties of a live
cell. Viroids can't proliferate without a host cell, and they can't survive for long without
one
3. Bacteria have many different shapes that often determine their class. Research and form a
hypothesis on the evolutionary reasons for so many different bacterial morphologies.
Bacteria, like other microbes, respond to their surroundings by growing and adapting.
After doing some study and thinking about why bacteria have so many various shapes
that distinguish which class they belong to, I came up with the following hypothesis:
Bacterial morphologies exist because an organism's shape changes throughout time to
suit the environment in which it lives
, Lab 3 Structure & Microscopy BIO250L
4. Do a search online or look in your textbook for 1-2 antibiotics that affect Gram-positive bacteria
and list them. On what part of the cell do the antibiotics usually work? List one or two antibiotics
that affect Gram-negative bacteria? On what part of the cell do the antibiotics usually work? (Be
sure to cite your sources in your answer.)
Penicillin and cloxacillin are antibiotics that attack gram-positive bacteria. Antibiotics
operate by destroying the bacteria's cell wall, according to an article on the Live Science
website by Joseph Castro. Amikacin and neomycin medicines are two antibiotics that
attack gram-negative bacteria. The outer membrane of the call is frequently attacked by
these antibiotics.
5. Why do you think it is important to identify a bacterial disease in a patient before prescribing any
antibiotic treatments? (Be specific.)
Click here to enter text.Each bacterial disease is different, and each antibiotic treatment
only attacks specific things with each bacterium so if a patient is prescribed an antibiotic
that attacks a structure that is healthy or not needed to be killed, then it can result in a
profoundly serious problem. For example, if a patient who has a disease caused by
gram-negative bacteria is prescribed penicillin, then the penicillin antibiotic will do its job,
but it will not be effective because it targets the coll wall of bacteria and destroys it by
bursting the call wall when the disease would be caused by cells that do not contain a
cell wall. In return that will not help the patient's disease but instead could cause even
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