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Describe the three major types of cytoskeletal elements.

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Microtubules are the largest in diameter...

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Telomeres are structures that limit the maximum number of times cells can divide.

A) True
B) False

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Mitosis refers only to nuclear division. Separation of the entire cell following mitosis is ___.


A) meiosis.
B) karyokinesis.
C) cytokinesis.
D) telophase.
E) anaphase

F) All of the above
G) A) and E)

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The temporary structures in the cytoplasm include all of the following except


A) pigments.
B) glycosomes.
C) lipid droplets.
D) the Golgi apparatus.
E) protein crystals.

F) A) and E)
G) B) and E)

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Which membranous organelle is the site of protein synthesis for proteins that are secreted by the cell?


A) Golgi apparatus
B) lysosome
C) rough endoplasmic reticulum
D) mitochondria
E) peroxisome

F) B) and E)
G) C) and D)

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In the cell life cycle, DNA is replicated during


A) interphase G1.
B) interphase S.
C) prophase I.
D) prophase II.
E) interphase G2.

F) C) and E)
G) A) and B)

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Each cell performs all of the function necessary to sustain life. Those functions include all of the following except


A) obtaining nutrients from the surrounding body fluids.
B) dispose of wastes.
C) replicate itself.
D) use nutrients to make the molecules it needs.
E) phagocytosing other cells.

F) A) and D)
G) A) and C)

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Which of the following cytoskeleton elements are the largest in diameter?


A) microtubules
B) microfilaments
C) intermediate filaments
D) centrioles
E) actin

F) A) and E)
G) A) and B)

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Which organelle contains some DNA and is capable of self-replication?


A) Golgi apparatus
B) lysosome
C) rough endoplasmic reticulum
D) mitochondria
E) peroxisome

F) A) and E)
G) A) and C)

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The endocytotic process in which small vesicles of fluid are brought into the cell is called


A) phagocytosis.
B) pinocytosis.
C) exocytosis.
D) xenocytosis.
E) receptor-mediated endocytosis

F) A) and B)
G) C) and D)

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The cytoskeletal elements that form a ring to "squeeze" the two daughter cells apart during cytokinesis are


A) microtubules.
B) microfilaments.
C) intermediate filaments.
D) the microtrabecular lattice.

E) B) and C)
F) A) and D)

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What would extended chromatin wrapped around a group of eight histones be called?

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During mitosis, the kinetochore microtubules of the mitotic spindle


A) attach to chromatids and align them at the metaphase plate.
B) push on the chromatids.
C) anchor the centriole to the cell membrane.
D) push the two poles of the cell apart.

E) B) and C)
F) None of the above

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Peroxisomes are important in detoxification of a number of toxic substances, for instance, hydrogen peroxide.

A) True
B) False

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Which type of endocytosis ingests the most specific type of molecule?


A) fluid-phase endocytosis
B) phagocytosis
C) pinocytosis
D) receptor-mediated endocytosis
E) vesiclcytosis

F) A) and D)
G) D) and E)

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In chromatin, the DNA molecule wraps around proteins called


A) nucleotides.
B) codons.
C) integral protein.
D) histones.
E) SNARE proteins

F) B) and C)
G) A) and B)

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Which of the following is true regarding cytoplasmic inclusions?


A) Lipid droplets are found in all cells in the body.
B) Glycosomes store sugar in the form of glycogen.
C) Crystals of protein contain enzymes that degrade glycogen into glucose subunits.
D) Lysosomes are considered cytoplasmic inclusions.
E) Pigments are cytoplasmic inclusions that store fat.

F) None of the above
G) B) and D)

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The nuclear envelope is continuous with which organelle?


A) Golgi apparatus
B) lysosome
C) rough endoplasmic reticulum
D) mitochondria
E) peroxisome

F) B) and D)
G) C) and E)

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During anaphase, the chromosomes are moved to the center of the cell.

A) True
B) False

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A mitotic spindle develops during early telophase of mitosis.

A) True
B) False

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