“Lab 3 Structure & Microscopy BIO250L”
Student Name: Olusola Raphael Adeoshun Access Code (located on the underside of the lid of your lab kit): M6P8RHO
1. What determines if a bacterial cell is Gram-positive or Gram-negative?
Gram positive bacteria have a thick peptidoglycan layer and no outer lipid
membrane while gram negative bacteria have a thin peptidoglycan layer
and have outer lipid membrane.
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 the tiniest pathogens consisting of just a single strand of RNA
and no protein covering. Just like prions and viruses, viroids are
categorized as cellular as they lack all of the necessary properties of a live
cell. Viroids can’t proliferate without a host and they can’t survive for long
without a host.
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.
Just like every other microbe, bacteria respond to their surroundings by
growing and adapting. I studied and had some thoughts about why bacteria
have different shapes that distinguish what class they belong to. I
developed this hypothesis; Bacterial morphologies exist because an
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