BSC 203 Exam 1 2025/2026 Exam
Questions and Verified Answers |
Already Graded A+
light microscope - 🧠 ANSWER ✔✔uses visible light to illuminate specimen.
Also allows us to magnify cells up to 1000 times and to resolve details that
are very tiny(0.2 um)
1)A bright light must be focused onto the specimen by lenses in the
condenser
2)The specimen must be carefully prepared to allow light to pass through it
3)Set of lenses must be arranged to focus an image of the specimen in the
eye - 🧠 ANSWER ✔✔What are the three things required for viewing cells in
a light microscope?
1
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,transmission electron microscope - 🧠 ANSWER ✔✔-uses a beam of
electrons instead of a beam of light and magnetic coils to focus the beam
instead of glass lenses.
- specimen is stained with electron-dense heavy metals that absorb or
scatter electrons,
-Can resolve details as small as about 1nm in biological specimens
confocal microscopy - 🧠 ANSWER ✔✔-special type of fluorescence
microscope that builds up an image by scanning the specimen with a laser
beam
-the beam is focused onto a single point at a specific depth in the
specimen, and a pinhole in the detector allows only fluorescence emitted
from this same point to be included in the image
-provides an optical section showing the individual cells clearly
scanning electron microscopy - 🧠 ANSWER ✔✔-Specimen is coated with a
very thin film of a heavy metal
-is scanned by a beam of electrons brought to a focus on the specimen by
magnetic coils that act as lenses
2
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,-microscope creates three-dimensional objects with great depth of focus
and can resolve details down between 3 nm and 20 nm
fluorescence microscope - 🧠 ANSWER ✔✔-fluorescence dyes are used for
staining cells and are detected
-illuminating light is passed through two filters
-1st filters the light before it reaches the specimen, passing only those
wavelengths that excite the dye
2nd blocks out this light and passes only those wavelengths emitted when
the dye fluoresces. Dyed objects show up in bright color on a dark
background
1. The smallest clearly defined unit of life is the cell (Schwann)
2. All living organisms are composed of cells. (Schwann)
3. Cells arise only from other cells (Virchow)
4. Each cell can maintain its living properties independently from the rest,
but the properties of life displayed by any organism depend on the
properties of the cells its made of. (Virchow) - 🧠 ANSWER ✔✔What are the
four points of cell theory?
-bacteria(one of the two divisions of prokaryotes)
3
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, -lack a nucleus
-spherical, rod like, or corkscrew
-small
-most diverse
-single celled
-can live in any habitat
-use binary fission
-circular DNA
-don't have membrane bound organelles - 🧠 ANSWER ✔✔What are the
characteristics of a prokaryotic cell?
-bigger and more elaborate
-ex: amoeba and yeasts (single celled)
-nucleus
-mitochondria
-chloroplasts
-cytoskeleton
4
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PRIVACY STATEMENT. ALL RIGHTS RESERVED
Questions and Verified Answers |
Already Graded A+
light microscope - 🧠 ANSWER ✔✔uses visible light to illuminate specimen.
Also allows us to magnify cells up to 1000 times and to resolve details that
are very tiny(0.2 um)
1)A bright light must be focused onto the specimen by lenses in the
condenser
2)The specimen must be carefully prepared to allow light to pass through it
3)Set of lenses must be arranged to focus an image of the specimen in the
eye - 🧠 ANSWER ✔✔What are the three things required for viewing cells in
a light microscope?
1
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,transmission electron microscope - 🧠 ANSWER ✔✔-uses a beam of
electrons instead of a beam of light and magnetic coils to focus the beam
instead of glass lenses.
- specimen is stained with electron-dense heavy metals that absorb or
scatter electrons,
-Can resolve details as small as about 1nm in biological specimens
confocal microscopy - 🧠 ANSWER ✔✔-special type of fluorescence
microscope that builds up an image by scanning the specimen with a laser
beam
-the beam is focused onto a single point at a specific depth in the
specimen, and a pinhole in the detector allows only fluorescence emitted
from this same point to be included in the image
-provides an optical section showing the individual cells clearly
scanning electron microscopy - 🧠 ANSWER ✔✔-Specimen is coated with a
very thin film of a heavy metal
-is scanned by a beam of electrons brought to a focus on the specimen by
magnetic coils that act as lenses
2
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
,-microscope creates three-dimensional objects with great depth of focus
and can resolve details down between 3 nm and 20 nm
fluorescence microscope - 🧠 ANSWER ✔✔-fluorescence dyes are used for
staining cells and are detected
-illuminating light is passed through two filters
-1st filters the light before it reaches the specimen, passing only those
wavelengths that excite the dye
2nd blocks out this light and passes only those wavelengths emitted when
the dye fluoresces. Dyed objects show up in bright color on a dark
background
1. The smallest clearly defined unit of life is the cell (Schwann)
2. All living organisms are composed of cells. (Schwann)
3. Cells arise only from other cells (Virchow)
4. Each cell can maintain its living properties independently from the rest,
but the properties of life displayed by any organism depend on the
properties of the cells its made of. (Virchow) - 🧠 ANSWER ✔✔What are the
four points of cell theory?
-bacteria(one of the two divisions of prokaryotes)
3
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
, -lack a nucleus
-spherical, rod like, or corkscrew
-small
-most diverse
-single celled
-can live in any habitat
-use binary fission
-circular DNA
-don't have membrane bound organelles - 🧠 ANSWER ✔✔What are the
characteristics of a prokaryotic cell?
-bigger and more elaborate
-ex: amoeba and yeasts (single celled)
-nucleus
-mitochondria
-chloroplasts
-cytoskeleton
4
COPYRIGHT@SARAHROSAPERAL 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE.
PRIVACY STATEMENT. ALL RIGHTS RESERVED
