PORTAGE LEARNING: MICROBIOLOGY FINAL EXAM SET ALREADY PASSED

PORTAGE LEARNING: MICROBIOLOGY FINAL EXAM SET ALREADY PASSED
Question 1: Match each of the following organelles with the
correct description. Ribosomes, nucleus, cytoplasm, lysosomes
CORRECT ANSWER: Ribosomes - function in protein
synthesis, nucleus - contains genomic content, cytoplasm -
constitutes the open volume, lysosomes - contains hydrolytic
enzymes
Question 2: Briefly explain how a Scanning Electron
Microscope (SEM) forms an image of subcellular organelles,
substrates, and viral particles.
CORRECT ANSWER: An image is formed from the
interactions of electrons as they reflect off (not through) the
surface of the specimen. Samples are coated in either gold or
palladium to enhance electron reflections. The reflection is seen
in 3-D rendering. OR A scan (image) as electrons reflect off
surfaces of a specimen loaded into the machine. In order for this
to best work, any sample is coated in gold or other refractive
material to enhance reflections. SEM is shown in 3-D

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