MMSC490 Exam 1 Questions and
Answers 100% Pass
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. - CORRECT ANSWER:-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. - CORRECT ANSWER:-all
of the above
Arabidopsis thaliana is a model organism for studying the molecular biology of:
a. plants.
,b. fungi.
c. fruit flies.
d. vertebrates. - CORRECT ANSWER:-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. - CORRECT ANSWER:-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. - CORRECT ANSWER:-b. visualize proteins in living
cells
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 - CORRECT
ANSWER:-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. - CORRECT ANSWER:-d. equilibrium
centrifugation
The most abundant molecules in cells are:
a. proteins.
b. carbohydrates.
c. lipids.
d. water. - CORRECT ANSWER:-d. water.
A few sugars joined together are called a(n):
a. glycoside.
, b. oligosaccharide.
c. polysaccharide.
d. starch. - CORRECT ANSWER:-b. oligosaccharide
Steroid hormones are derivatives of:
a. cholesterol.
b. phospholipids.
c. amino acids.
d. sugars. - CORRECT ANSWER:-a. cholesterol
Complementary base pairs form _______ bonds to direct replication of DNA.
a. hydrogen
b. phosphodiester
c. glycosidic
d. covalent - CORRECT ANSWER:-a. hydrogen
Polymerization of nucleotides to form nucleic acids involves the formation of
_______ bonds.
a. peptide
b. phosphodiester
c. glycosidic
Answers 100% Pass
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. - CORRECT ANSWER:-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. - CORRECT ANSWER:-all
of the above
Arabidopsis thaliana is a model organism for studying the molecular biology of:
a. plants.
,b. fungi.
c. fruit flies.
d. vertebrates. - CORRECT ANSWER:-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. - CORRECT ANSWER:-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. - CORRECT ANSWER:-b. visualize proteins in living
cells
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 - CORRECT
ANSWER:-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. - CORRECT ANSWER:-d. equilibrium
centrifugation
The most abundant molecules in cells are:
a. proteins.
b. carbohydrates.
c. lipids.
d. water. - CORRECT ANSWER:-d. water.
A few sugars joined together are called a(n):
a. glycoside.
, b. oligosaccharide.
c. polysaccharide.
d. starch. - CORRECT ANSWER:-b. oligosaccharide
Steroid hormones are derivatives of:
a. cholesterol.
b. phospholipids.
c. amino acids.
d. sugars. - CORRECT ANSWER:-a. cholesterol
Complementary base pairs form _______ bonds to direct replication of DNA.
a. hydrogen
b. phosphodiester
c. glycosidic
d. covalent - CORRECT ANSWER:-a. hydrogen
Polymerization of nucleotides to form nucleic acids involves the formation of
_______ bonds.
a. peptide
b. phosphodiester
c. glycosidic
