Molecular Biology of the Cell, Exam 1
UPDATED ACTUAL Questions and
CORRECT Answers
RNA is hypothesized to have been the genetic material of the original cell because - CORRECT
ANSWER - RNA is capable of catalyzing some chemical reactions like self-replication
Which of the following is a common feature of monosaccharides, polysaccharides, and
triacylglycerols (fats) - CORRECT ANSWER - All can act as energy stores or energy
sources
CRISPR-Cas9 is being used by scientists to - CORRECT ANSWER - to knock out or alter
genes in chromosomes of cells
A monosaccharide can be linked or attached to - CORRECT ANSWER - another
monosaccharide, a chain of polysaccharides, a lipid, a protein
What is not a property of water - CORRECT ANSWER - It is not non-polar
properties of water - CORRECT ANSWER - High surface tension, can be acidic and basic,
most abundant molecule/compound in cells, forms hydrogen bonds
The expression of a gene can be silenced in Eukaryotic cells by - CORRECT ANSWER -
expressing a short interfering RNA into the cells
Which of the following can act to both increase and decrease the fluidity of membranes
depending on the temperature and its concentration - CORRECT ANSWER - cholesterol
The western blot or immunoblotting technique detects a specific [_______] - CORRECT
ANSWER - protein with an antibody
, Which of the following is thought to have arisen by endosymbiosis - CORRECT
ANSWER - chloroplast and mitochondria
What is true about the phospholipids one would observe in the membranes of an eukaryotic
organism - CORRECT ANSWER - The type of phospholipids found in the membrane of a
cell would vary in the different cell types, in the membranes of the different organelles and in the
two halves of each membrane in the different parts of the cell
If the concentration of Na and K ions was 10mM and 140 mM in the inside of an animal cell and
was 145mM and 5 mM respectively, on the outside of the cell, then what describes a way that
potassium ions would enter the cell under these conditions - CORRECT ANSWER -
Potassium ion could enter the cell by a transporter that cleaved ATP to drive the transport, or
potassium could enter the cell by a symport that transported a potassium ion in as a sodium ion
was also transported inside the cell
What is the best description of the movement observed by integral membrane proteins -
CORRECT ANSWER - some integral membrane proteins can diffuse laterally through the
membrane while others are held in place
Transmission electron microscopy is used to - CORRECT ANSWER - observe the fine
details of intracellular cell structures such as organelles and membranes
What is a technique that scientists use to test whether two different cellular proteins interact -
CORRECT ANSWER - Yeast two-hybrid system
You are conducting a microarray experiment and have labeled the cDNAs generated from cell
line A with a red dye and the cDNA generated from cell line B with the green dye. For gene spot
45, you observe that the color was green, what does that mean - CORRECT ANSWER -
more copies of the mRNAs for gene 45 were present in cell line B than in cell line A
What is not a difference between RNA and DNA - CORRECT ANSWER - the linkeage
between the nucleotides in each
UPDATED ACTUAL Questions and
CORRECT Answers
RNA is hypothesized to have been the genetic material of the original cell because - CORRECT
ANSWER - RNA is capable of catalyzing some chemical reactions like self-replication
Which of the following is a common feature of monosaccharides, polysaccharides, and
triacylglycerols (fats) - CORRECT ANSWER - All can act as energy stores or energy
sources
CRISPR-Cas9 is being used by scientists to - CORRECT ANSWER - to knock out or alter
genes in chromosomes of cells
A monosaccharide can be linked or attached to - CORRECT ANSWER - another
monosaccharide, a chain of polysaccharides, a lipid, a protein
What is not a property of water - CORRECT ANSWER - It is not non-polar
properties of water - CORRECT ANSWER - High surface tension, can be acidic and basic,
most abundant molecule/compound in cells, forms hydrogen bonds
The expression of a gene can be silenced in Eukaryotic cells by - CORRECT ANSWER -
expressing a short interfering RNA into the cells
Which of the following can act to both increase and decrease the fluidity of membranes
depending on the temperature and its concentration - CORRECT ANSWER - cholesterol
The western blot or immunoblotting technique detects a specific [_______] - CORRECT
ANSWER - protein with an antibody
, Which of the following is thought to have arisen by endosymbiosis - CORRECT
ANSWER - chloroplast and mitochondria
What is true about the phospholipids one would observe in the membranes of an eukaryotic
organism - CORRECT ANSWER - The type of phospholipids found in the membrane of a
cell would vary in the different cell types, in the membranes of the different organelles and in the
two halves of each membrane in the different parts of the cell
If the concentration of Na and K ions was 10mM and 140 mM in the inside of an animal cell and
was 145mM and 5 mM respectively, on the outside of the cell, then what describes a way that
potassium ions would enter the cell under these conditions - CORRECT ANSWER -
Potassium ion could enter the cell by a transporter that cleaved ATP to drive the transport, or
potassium could enter the cell by a symport that transported a potassium ion in as a sodium ion
was also transported inside the cell
What is the best description of the movement observed by integral membrane proteins -
CORRECT ANSWER - some integral membrane proteins can diffuse laterally through the
membrane while others are held in place
Transmission electron microscopy is used to - CORRECT ANSWER - observe the fine
details of intracellular cell structures such as organelles and membranes
What is a technique that scientists use to test whether two different cellular proteins interact -
CORRECT ANSWER - Yeast two-hybrid system
You are conducting a microarray experiment and have labeled the cDNAs generated from cell
line A with a red dye and the cDNA generated from cell line B with the green dye. For gene spot
45, you observe that the color was green, what does that mean - CORRECT ANSWER -
more copies of the mRNAs for gene 45 were present in cell line B than in cell line A
What is not a difference between RNA and DNA - CORRECT ANSWER - the linkeage
between the nucleotides in each
