BIOL 314 Exam 3 Review Questions
and Answers.
The cytoskeletal system characterized as being comprised of rope-like fibers that give the cell
mechanical strength and distribute mechanical stress are: - Answer intermediate filaments
Which of the following statements about the cytoskeleton is FALSE - Answer Covalent bonds
between protein monomers hold together cytoskeletal filaments
For both actin and microtubule polymerization, nucleotide hydrolysis is important for - Answer
decreasing the binding strength between subunits on filaments
Which of the following statements about the structure of microtubules is FALSE - Answer α-
Tubulin and β-tubulin are covalently bound to make the tubulin dimer that then assembles into
protofilaments
The hydrolysis of GTP to GDP carried out by tubulin molecules - Answer allows dynamic
instability
Which of the following statements about microtubules is TRUE - Answer Motor proteins
move in a directional fashion along microtubules by using theinherent structural polarity of a
protofilament.
what type of motor protein moves to the positive direction? - Answer kinesin
what type of motor protein moves to the negative end? - Answer dynein
Which of the following statements about actin is FALSE? - Answer Linkage of actin to the
desmosome provides structural integrity to the tissue
Which of the following statements about skeletal muscle contraction is FALSE? - Answer The
changes in voltage across the plasma membrane that occur when a musclecell receives a signal
from the nervous system cause an influx of Ca into thesarcoplasmic reticulum, triggering a
muscle contraction
You are studying nuclear lamins and use recombinant DNA technology to alterthe coding
sequence of a nuclear lamin gene. The alteration you make creates asituation such that the
gene now codes for a nuclear lamin protein that can no longerbe phosphorylated when the
nuclear envelope is broken down during mitosis. Whatdo you predict would happen if the cell
and Answers.
The cytoskeletal system characterized as being comprised of rope-like fibers that give the cell
mechanical strength and distribute mechanical stress are: - Answer intermediate filaments
Which of the following statements about the cytoskeleton is FALSE - Answer Covalent bonds
between protein monomers hold together cytoskeletal filaments
For both actin and microtubule polymerization, nucleotide hydrolysis is important for - Answer
decreasing the binding strength between subunits on filaments
Which of the following statements about the structure of microtubules is FALSE - Answer α-
Tubulin and β-tubulin are covalently bound to make the tubulin dimer that then assembles into
protofilaments
The hydrolysis of GTP to GDP carried out by tubulin molecules - Answer allows dynamic
instability
Which of the following statements about microtubules is TRUE - Answer Motor proteins
move in a directional fashion along microtubules by using theinherent structural polarity of a
protofilament.
what type of motor protein moves to the positive direction? - Answer kinesin
what type of motor protein moves to the negative end? - Answer dynein
Which of the following statements about actin is FALSE? - Answer Linkage of actin to the
desmosome provides structural integrity to the tissue
Which of the following statements about skeletal muscle contraction is FALSE? - Answer The
changes in voltage across the plasma membrane that occur when a musclecell receives a signal
from the nervous system cause an influx of Ca into thesarcoplasmic reticulum, triggering a
muscle contraction
You are studying nuclear lamins and use recombinant DNA technology to alterthe coding
sequence of a nuclear lamin gene. The alteration you make creates asituation such that the
gene now codes for a nuclear lamin protein that can no longerbe phosphorylated when the
nuclear envelope is broken down during mitosis. Whatdo you predict would happen if the cell
