lecture 7 Flashcards
(14 cards)
what can cell wall structure (amount of peptidoglycan) be used to determine?
can differentiate between gram-negative and gram-positive bacteria
what is the appearance of gram-positive bacteria after staining?
appears purple because the dye gets stuck in the thick cell wall
what is the appearance of gram-negative bacteria after staining?
the dye washes off because the cell wall is thin
is gram-negative or gram-positive bacteria more difficult to treat?
gram-negative
why is gram-negative bacteria more difficult to treat?
the outer membrane contains lipids that are toxic, which can lead to more severe infection
the outer membrane is more resistant to antibiotics
what is cell morphology good and bad for?
good for identifying but bad for classifying because of a wide variety of chapes in each phylum
metabolism definition:
life sustaining chemical reactions in living organisms
three main functions of metabolism
To capture, convert and/or generate energy.
To obtain carbon to build up proteins, lipids, nucleic acids and carbohydrates
To eliminate waste
how do heterotrophs fix carbon?
eat carbon-rich molecules
ex, all animals, some prokaryotes and all fungi
how do autotrophs fix carbon?
fix carbon from CO2 to produce glucose
ex. plants, algae and some prokaryotes
what can heterotrophic prokaryotes do to obtain carbon?
from dead organic matter or carbon rich hydrocarbons
how do chemotrophs obtain energy?
from the oxidation of substances in the environment
ex.. all animals (glucose(
how to phototrophs obtain energy?
from the sunlight
ex. plants & algae
is metabolic process an effective way to classify prokaryotes?
