Structure & Microscopy

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?

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


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