What is the role of lenses in microscopy? Lenses focus either light or electrons to create a magnified image of a specimen.
Identify the microscope used to acquire the images Scanning electrons - picture of microorganisms Phase Contrast Light - zoomed out group Transmission electron - individual p...
MCB 100 EXAM 1 QUESTIONS AND
COMPLETE SOLUTIONS
What is the role of lenses in microscopy? ✅Lenses focus either light or electrons to
create a magnified image of a specimen.
Identify the microscope used to acquire the images ✅Scanning electrons - picture of
microorganisms
Phase Contrast Light - zoomed out group
Transmission electron - individual phase black and white
Fluorescent Light - Green
Bright-Field Light - zoomed out black and white
Differential Interference Contrast - Blue Light with Microbial details
A laboratory scientist discovers teichoic acid in the blood serum of a patient. This
indicates the patient likely has an infection with ✅Gram-Positive Bacteria
Which microorganisms have a thick layer of peptidoglycan? ✅Gram-Positive Bacteria
A medical student is examining some Gram stained specimens. She notes that some
prokaryotic cells appear purple under the microscope. She concludes they are
✅Gram-Positive Bacteria
Which of these chemicals is in peptidoglycan? ✅N-acetylglucosamine
Staining is an important way to improve which of the following aspects of microscopy?
✅resolution and contrast
What class of biochemical reactions generally release energy? ✅Decomposition
Reactions
Why is it difficult for protons (H+) to move across phospholipid bilayer membranes?
✅The positive charge on protons prevents them from passing through the hydrophobic
interior of membranes.
In metabolism, energy that is not used ✅is given off as heat.
The reactions involved in producing larger compounds from smaller compounds is
called ✅anabolism
Where does the energy required for anabolic reactions come from? ✅catabolic
reactions
, In which of the following organelles does photosynthesis take place? ✅Chloroplasts
What connects the two photosystems in the light reactions? ✅electron transport chains
What two molecules are produced by the light reactions and used to power the Calvin
cycle? ✅ATP and NADPH
What provides electrons for the light reactions? ✅H2O
What provides the carbon atoms that are incorporated into sugar molecules in the
Calvin cycle? ✅CO2
What transports electrons from the light reactions to the Calvin cycle? ✅NADPH
The light reactions take place in the _________ and the Calvin cycle takes place in the
_________. ✅thylakoids; stroma
What is the role of light energy in photosynthesis? ✅To produce a proton gradient to
make ATP
What molecule is used to capture light energy? ✅Chlorophyll
Which of the following is the best example of a microbiome? ✅the hundreds of
different species in your large intestine using different nutrient sources and producing
different products
What is the term used for groups of microbes that have similar metabolic requirements
and therefore live in similar environmental niches? ✅Guilds
A ________ is a single species in an environment. ✅population
Which of the following is the CORRECT sequence of microbial associations from
smallest to largest? ✅populations, guilds, communities, microhabitats, ecosystem
What do we call the use of microbes to break down toxic or harmful compounds in the
environment? ✅Bioremediation
Why are open coal mines (strip mines) more likely to result in acid mine drainage than
are underground mines? ✅Air exposure increases the oxidation rate of sulfur and iron
by bacteria, and oxidized sulfur or iron can combine with rainwater to form a strong acid.
What produces the acidic pH of some mine runoff? ✅both oxidation of metal ores and
microbial activity
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