Practice exam 2 '20 Flashcards
Which scientist used flasks like the one pictured (schwann neck) here to disprove the spontaneous generation of microbes
Pasteur
which scientist coined the word “cell” to describe what he saw while viewing cork with his microscope
hooke
what property of a light microscope is most directly affected by the wavelength of light used
resolution
where would you expect to find the peptidoglycan layer of a gram negative bacterium
outside of the outer membrane
which of these statements is NOT true of bacterial flagella
a. they are made of many different proteins
b. they use a charge gradient for energy
c. they cause the cell to move by waving back and forth
d. they are not surrounded by a membrane sheath
a. they are made of many different proteins
what sort of microbial cell would be most likely to contain tetraether lipids
archea
which group of protozoa includes the pathogen, Balantinium coli
sarcodina
what are the sexual spores of Penicillium chrysogenum
ascospores
what is the chemical composition of the plant pathogens called viroids
RNA only
what is the causitive agent of “mad cow disease”?
prion
what process do prokaryotic cells use to divide
binary fission
which of these sequences arranges the stages of bacterial growth into the correct order
- stationary phase
- death phase
- log phase
- lag phase
4 lag phase, 3 log phase, 1 stationary phase, 2 death phase
if you have 5000 bacteria with a doubling time of 15 minutes, how many will you have after one hour of growth under optimal conditions
8,000
Which of these sequences arranges the steps in endospore formation into the correct order
- coat synthesis
- cortex synthesis
- engulfment of the forespore
- asymmetric septum formation
4 asymmetric septum formation, 3, engulfment of the forespore, 2 cortex synthesis, 1 coast synthesis
where would you expect to find dipicolinate in a bacterial endospore
core
what sort of growth is exemplified by the thioglycollate tube to the right (thin layer at very top of liquid then thicker layer below, separate from one another)
obligate aerobe
what type of microbe exhibits optimal growth at 120 degrees celcius
extreme thermophile
what term refers to organisms that get their carbon from CO2
autotroph
which of these sequences arranges the steps in glycolysis into the correct order
- energy is captured to make a “profit”
- ATP is used to phosphorylate a sugar
- a six carbon sugar is cut in half
- energy is captured to break even
2 ATP is used to phosphorylate a sugar, 4 energy is captured to break even, 3 a six carbon sugar is cut in half, 1 energy is captured to make a profit
what is the net yield of atp from the Entner Doudoroff pathway
one
how many total CO2 are produced from one glucose during aerobic respiration in Escherichia coli
six
What sort of reaction metabolic reaction does the polymerization of glucose into starch represent
catabolic
what is the composition of most biological catalysts
protein
what sort of chemical reaction is illustrated to the right (substrates, increase in energy then decrease in energy for the products to a level lower than the substrates)
exergonic
