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MMSC490 Exam 1 Questions and Correct
Answers/ Latest Update / Already Graded
cytoplasmic organelles are:
a. absent in prokaryotic cells and present in eukaryotic cells.
b. present in both prokaryotic and eukaryotic cells.
c. present in prokaryotic cells and absent in eukaryotic cells.
d. absent in both prokaryotic and eukaryotic cells.
Ans: a. absent in prokaryotic cells and present in eukaryotic
cells
E. coli is a useful model system for molecular biology studies because:
a. it has a small genome.
b. it reproduces rapidly.
c. mutants can easily be isolated from culture dishes.
Ans: all of the above
Arabidopsis thaliana is a model organism for studying the molecular
biology of:
a. plants.
b. fungi.
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c. fruit flies.
d. vertebrates.
Ans: a. plants
The diffraction limited resolving power of a standard light microscope
is
approximately:
a. 0.2 mm.
b. 0.2 µm.
c. 0.2 nm.
d. 2 Å.
Ans: b. 0.2 µm
A common use of green fluorescent protein (GFP) is to:
a. label antibodies.
b. visualize proteins in living cells.
c. photobleach other fluorescent proteins.
d. label DNA sequences.
Ans: b. visualize proteins in living cells
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Electron microscopes have a resolution advantage over light
microscopes
because:
a. electron microscopes allow the viewer to examine living cells.
b. electron microscope lens have a larger numerical aperture.
c. electron microscopes are easier to use.
d. the wavelength of electrons is shorter than that of light
Ans: d. the wavelength of electrons is shorter than that of light
In a classic experiment that demonstrated the semiconservative nature
of DNA replication, cells were grown first in 14N-containing media and
later in 15N-containing media, and DNA was separated by:
a. electrophoresis.
b. differential centrifugation.
c. velocity density-gradient centrifugation.
d. equilibrium centrifugation.
Ans: d. equilibrium centrifugation
The most abundant molecules in cells are:
a. proteins.
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b. carbohydrates.
c. lipids.
d. water.
Ans: d. water.
A few sugars joined together are called a(n):
a. glycoside.
b. oligosaccharide.
c. polysaccharide.
d. starch.
Ans: b. oligosaccharide
Steroid hormones are derivatives of:
a. cholesterol.
b. phospholipids.
c. amino acids.
d. sugars.
Ans: a. cholesterol
All rights reserved © 2025/ 2026 |
MMSC490 Exam 1 Questions and Correct
Answers/ Latest Update / Already Graded
cytoplasmic organelles are:
a. absent in prokaryotic cells and present in eukaryotic cells.
b. present in both prokaryotic and eukaryotic cells.
c. present in prokaryotic cells and absent in eukaryotic cells.
d. absent in both prokaryotic and eukaryotic cells.
Ans: a. absent in prokaryotic cells and present in eukaryotic
cells
E. coli is a useful model system for molecular biology studies because:
a. it has a small genome.
b. it reproduces rapidly.
c. mutants can easily be isolated from culture dishes.
Ans: all of the above
Arabidopsis thaliana is a model organism for studying the molecular
biology of:
a. plants.
b. fungi.
All rights reserved © 2025/ 2026 |
, Page |2
c. fruit flies.
d. vertebrates.
Ans: a. plants
The diffraction limited resolving power of a standard light microscope
is
approximately:
a. 0.2 mm.
b. 0.2 µm.
c. 0.2 nm.
d. 2 Å.
Ans: b. 0.2 µm
A common use of green fluorescent protein (GFP) is to:
a. label antibodies.
b. visualize proteins in living cells.
c. photobleach other fluorescent proteins.
d. label DNA sequences.
Ans: b. visualize proteins in living cells
All rights reserved © 2025/ 2026 |
, Page |3
Electron microscopes have a resolution advantage over light
microscopes
because:
a. electron microscopes allow the viewer to examine living cells.
b. electron microscope lens have a larger numerical aperture.
c. electron microscopes are easier to use.
d. the wavelength of electrons is shorter than that of light
Ans: d. the wavelength of electrons is shorter than that of light
In a classic experiment that demonstrated the semiconservative nature
of DNA replication, cells were grown first in 14N-containing media and
later in 15N-containing media, and DNA was separated by:
a. electrophoresis.
b. differential centrifugation.
c. velocity density-gradient centrifugation.
d. equilibrium centrifugation.
Ans: d. equilibrium centrifugation
The most abundant molecules in cells are:
a. proteins.
All rights reserved © 2025/ 2026 |
, Page |4
b. carbohydrates.
c. lipids.
d. water.
Ans: d. water.
A few sugars joined together are called a(n):
a. glycoside.
b. oligosaccharide.
c. polysaccharide.
d. starch.
Ans: b. oligosaccharide
Steroid hormones are derivatives of:
a. cholesterol.
b. phospholipids.
c. amino acids.
d. sugars.
Ans: a. cholesterol
All rights reserved © 2025/ 2026 |
