LIFESCI 7C PREPARATION TEST 2026
QUESTIONS AND CORRECT ANSWERS
GRADED A+
● Why are some mutations of Ras associated with cancer?
a. Ras activates the MAP kinase signal transduction pathway.
b. Ras binds to growth factor receptors.
c. Ras is a type of second messenger.
d. Ras alters ion flow across the cell membrane.. Answer: a. Ras
activates the MAP kinase signal transduction pathway.
● The presence of excess EGF receptors can result in:
a. excessive cell division.
b. normal cell division.
c. diminished cell division.. Answer: a. excessive cell division.
● If two signaling pathways are activated simultaneously:
a. All of these choices are correct.
b. one may inhibit the other.
c. they may inhibit each other.
d. they may strengthen each other.. Answer: a. All of these choices are
correct.
,● The FIRST step following PDGF binding of the receptor is:
a. dimerization
b. phosphorylation
c. activation of MAP kinase.
d. activation of gene expression.. Answer: a. dimerization
● The muscle cells and nerve cells in a mouse look very different and
serve very different functions in the mouse's body. These differences are
because the muscle cells and nerve cells in the mouse:
a. have different genes.
b. have different ribosomes.
c. express different genes.
d. copy different genes.
e. have different chromosomes.
f. have different genetic codes.. Answer: c. express different genes.
● As cells become differentiated, they delete the DNA for genes they no
longer need.
a. False
b. True. Answer: a. False
● Cells differentiate through:
, a. gene regulation.
b. the cell cycle.
c. timing.
d. Growth.. Answer: a. gene regulation.
● Which of the following CORRECTLY matches a cell or group of cells
with its ability to differentiate into different specialized cells?
a. mesoderm: pluripotent
b. ectoderm: totipotent
c. fertilized egg: multipotent
d. endoderm: multipotent
d. fertilized egg: pluripotent. Answer: d. endoderm: multipotent
● Each answer option below lists terms that classify cell types according
to their developmental potential. Which of the options lists the terms
from those capable of differentiating into the greatest number of
different specialized cells to those capable of differentiating into the
least number of different specialized cells?
a. multipotent, totipotent, pluripotent
b. totipotent, multipotent, pluripotent
c. multipotent, pluripotent, totipotent
d. pluripotent, totipotent, multipotent
e. totipotent, pluripotent, multipotent. Answer: e. totipotent, pluripotent,
multipotent
QUESTIONS AND CORRECT ANSWERS
GRADED A+
● Why are some mutations of Ras associated with cancer?
a. Ras activates the MAP kinase signal transduction pathway.
b. Ras binds to growth factor receptors.
c. Ras is a type of second messenger.
d. Ras alters ion flow across the cell membrane.. Answer: a. Ras
activates the MAP kinase signal transduction pathway.
● The presence of excess EGF receptors can result in:
a. excessive cell division.
b. normal cell division.
c. diminished cell division.. Answer: a. excessive cell division.
● If two signaling pathways are activated simultaneously:
a. All of these choices are correct.
b. one may inhibit the other.
c. they may inhibit each other.
d. they may strengthen each other.. Answer: a. All of these choices are
correct.
,● The FIRST step following PDGF binding of the receptor is:
a. dimerization
b. phosphorylation
c. activation of MAP kinase.
d. activation of gene expression.. Answer: a. dimerization
● The muscle cells and nerve cells in a mouse look very different and
serve very different functions in the mouse's body. These differences are
because the muscle cells and nerve cells in the mouse:
a. have different genes.
b. have different ribosomes.
c. express different genes.
d. copy different genes.
e. have different chromosomes.
f. have different genetic codes.. Answer: c. express different genes.
● As cells become differentiated, they delete the DNA for genes they no
longer need.
a. False
b. True. Answer: a. False
● Cells differentiate through:
, a. gene regulation.
b. the cell cycle.
c. timing.
d. Growth.. Answer: a. gene regulation.
● Which of the following CORRECTLY matches a cell or group of cells
with its ability to differentiate into different specialized cells?
a. mesoderm: pluripotent
b. ectoderm: totipotent
c. fertilized egg: multipotent
d. endoderm: multipotent
d. fertilized egg: pluripotent. Answer: d. endoderm: multipotent
● Each answer option below lists terms that classify cell types according
to their developmental potential. Which of the options lists the terms
from those capable of differentiating into the greatest number of
different specialized cells to those capable of differentiating into the
least number of different specialized cells?
a. multipotent, totipotent, pluripotent
b. totipotent, multipotent, pluripotent
c. multipotent, pluripotent, totipotent
d. pluripotent, totipotent, multipotent
e. totipotent, pluripotent, multipotent. Answer: e. totipotent, pluripotent,
multipotent
