Question 1

Which organelles become fragmented during mitosis in mammalian cells?

Accepted Answer

A) mitochondria 
B) Golgi complex 
C) ER 
D) peroxisomes 
E) chloroplasts 
A) mitochondria 
B) Golgi complex 
C) ER 
D) peroxisomes 
E) chloroplasts B

Question 2

DNA replication and the production of additional histones occur during what part of the cell cycle?

Accepted Answer

A) G1 
B) S 
C) G2 
D) M 
E) G0 
A) G1 
B) S 
C) G2 
D) M 
E) G0 B

Question 3

When do most of the preparations for mitosis occur, including such activities as DNA replication?

Accepted Answer

A) cytokinesis 
B) M phase 
C) interphase 
D) telophase 
E) enterophase 
A) cytokinesis 
B) M phase 
C) interphase 
D) telophase 
E) enterophase C

Question 4

The nuclear pore complexes are disassembled _________.

Accepted Answer

A) as the interactions between nucleoporin complexes are disrupted and the proteins dissociate into the surrounding medium 
B) by depolymerization of the lamin filaments 
C) as their integrity is disrupted mechanically as holes are torn in the complexes by cytoplasmic dyneins associated with the outer nuclear membrane 
D) by cytoplasmic dyneins 
E) by cytoplasmic microtubules and microfilamnets 
A) as the interactions between nucleoporin complexes are disrupted and the proteins dissociate into the surrounding medium 
B) by depolymerization of the lamin filaments 
C) as their integrity is disrupted mechanically as holes are torn in the complexes by cytoplasmic dyneins associated with the outer nuclear membrane 
D) by cytoplasmic dyneins 
E) by cytoplasmic microtubules and microfilamnets

Question 5

What evidence suggests that a cell spends the majority of its time in interphase?

Accepted Answer

A) Interphase is more useful. 
B) Only a small percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time. 
C) A large percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time. 
D) A moderate percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time. 
E) Mitosis is too intricate a process to last very long. 
A) Interphase is more useful. 
B) Only a small percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time. 
C) A large percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time. 
D) A moderate percentage of cells in a tissue or cell culture are seen to be in mitosis at any given time. 
E) Mitosis is too intricate a process to last very long.

Question 6

During what stage do studies of mice and yeast cells suggest that DNA breaks leading to recombination begin?

Accepted Answer

A) pachytene 
B) leptotene 
C) diakinesis 
D) zygotene 
E) diplotene 
A) pachytene 
B) leptotene 
C) diakinesis 
D) zygotene 
E) diplotene

Question 7

As they separate, homologous chromosomes are seen to remain attached to each other at specific points by X-shaped structures at the crossover sites called _________.

Accepted Answer

A) crossover rings 
B) chiasmata 
C) chiastrata 
D) diplonema 
E) crenata 
A) crossover rings 
B) chiasmata 
C) chiastrata 
D) diplonema 
E) crenata

Question 8

The stages through which a cell passes from one cell division to the next constitute the _________.

Accepted Answer

A) cell cycle 
B) life cycle 
C) biocycle 
D) energy cycle 
E) regeneration cycle 
A) cell cycle 
B) life cycle 
C) biocycle 
D) energy cycle 
E) regeneration cycle

Question 9

What types of non-stem cells also engage in asymmetric or unequal divisions?

Accepted Answer

A) formation of oocytes and polar bodies 
B) formation of spermatogonia 
C) division of red blood cells 
D) division of B cells 
E) division of liver cells 
A) formation of oocytes and polar bodies 
B) formation of spermatogonia 
C) division of red blood cells 
D) division of B cells 
E) division of liver cells

Question 10

During which phase of meiosis do the kinetochores of sister chromatids face opposite poles as they line up in the center of the cells, with the centromeres of sister chromatids attached to chromosomal spindle fibers from opposite spindle poles?

Accepted Answer

A) prophase II 
B) metaphase II 
C) anaphase II 
D) metaphase I 
E) telophase II 
A) prophase II 
B) metaphase II 
C) anaphase II 
D) metaphase I 
E) telophase II

Question 11

The integrity of the nuclear membrane is disrupted _________.

Accepted Answer

A) as the interactions between nucleoporin complexes are disrupted and the proteins dissociate into the surrounding medium 
B) by depolymerization of the lamin filaments 
C) as its integrity is disrupted mechanically as holes are torn into it by cytoplasmic dyneins associated with the outer nuclear membrane 
D) by cytoplasmic kinesins 
E) by cytoplasmic microtubules and microfilaments 
A) as the interactions between nucleoporin complexes are disrupted and the proteins dissociate into the surrounding medium 
B) by depolymerization of the lamin filaments 
C) as its integrity is disrupted mechanically as holes are torn into it by cytoplasmic dyneins associated with the outer nuclear membrane 
D) by cytoplasmic kinesins 
E) by cytoplasmic microtubules and microfilaments

Question 12

What disease can be defined as resulting from a breakdown in a cell's ability to regulate its own division?

Accepted Answer

A) multiple sclerosis 
B) cancer 
C) emphysema 
D) diabetes 
E) heart disease 
A) multiple sclerosis 
B) cancer 
C) emphysema 
D) diabetes 
E) heart disease

Question 13

The process of centriole replication begins in the cytoplasm with the appearance of a small ________.

Accepted Answer

A) pericentriole 
B) procentriole 
C) precentriole 
D) procentrosome 
E) pericentrosome 
A) pericentriole 
B) procentriole 
C) precentriole 
D) procentrosome 
E) pericentrosome

Question 14

What triggers the start of centrosome duplication?

Accepted Answer

A) phosphorylation of a centrosomal protein by ATPase 
B) phosphorylation of a centrosomal protein by Cdk2 
C) dephosphorylation of a centrosomal protein by Cdk2 
D) dephosphorylation of a centrosomal protein by ATPase 
E) phosphorylation of a centrosomal protein focal adhesion kinase 
A) phosphorylation of a centrosomal protein by ATPase 
B) phosphorylation of a centrosomal protein by Cdk2 
C) dephosphorylation of a centrosomal protein by Cdk2 
D) dephosphorylation of a centrosomal protein by ATPase 
E) phosphorylation of a centrosomal protein focal adhesion kinase

Question 15

Synapsis is accompanied by the formation of a complex, ladder like structure made of three parallel bars with transverse protein filaments connecting its central element with two lateral elements. What is the name of this structure?

Accepted Answer

A) synaptonemal ladder 
B) ladderellen 
C) synaptonemal complex 
D) nuclear complex 
E) nucleolar complex 
A) synaptonemal ladder 
B) ladderellen 
C) synaptonemal complex 
D) nuclear complex 
E) nucleolar complex

Question 16

During which stage of meiosis do the chromosomes become recompacted after interkinesis?

Accepted Answer

A) telophase I 
B) telophase II 
C) prophase II 
D) metaphase II 
E) prophase I 
A) telophase I 
B) telophase II 
C) prophase II 
D) metaphase II 
E) prophase I

Question 17

You are carrying out experiments in cell fusion by fusing together cells at different stages of the cell cycle. You then observe the behavior of each nucleus residing in the combined cytoplasm of the two cells. Which of the following responses would occur if you fused a G2 cell to a cell in the M phase?

Accepted Answer

A) The nucleus from the G2 cell would start to replicate its DNA. 
B) The G2 nucleus would undergo premature chromosomal condensation to form a set of elongated, single compacted chromosomes. 
C) The M phase nucleus would be affected in such a way that its compacted chromosomes decondense. 
D) The G2 nucleus would undergo premature chromosomal condensation, but the compacted chromosomes would be visibly doubled. 
A) The nucleus from the G2 cell would start to replicate its DNA. 
B) The G2 nucleus would undergo premature chromosomal condensation to form a set of elongated, single compacted chromosomes. 
C) The M phase nucleus would be affected in such a way that its compacted chromosomes decondense. 
D) The G2 nucleus would undergo premature chromosomal condensation, but the compacted chromosomes would be visibly doubled.

Question 18

Which of the cells below normally possess a relatively high level of mitotic activity?

Accepted Answer

A) stem cells of various adult tissues 
B) hematopoietic stem cells that give rise to red and white blood cells 
C) stem cells at the base of numerous epithelia that line the body cavities 
D) the relatively unspecialized cells found near the tips of plant roots and stems 
E) all of these are correct 
A) stem cells of various adult tissues 
B) hematopoietic stem cells that give rise to red and white blood cells 
C) stem cells at the base of numerous epithelia that line the body cavities 
D) the relatively unspecialized cells found near the tips of plant roots and stems 
E) all of these are correct

Question 19

Even before cytokinesis has been completed, the two centrioles of a daughter cell disengage, an event that is triggered by the enzyme _________, which becomes activated late in mitosis.

Accepted Answer

A) invertase 
B) centriolase 
C) separase 
D) disengagase 
E) activase 
A) invertase 
B) centriolase 
C) separase 
D) disengagase 
E) activase

Question 20

What occurs during pairing of chromosomes in prophase of meiosis I that increases genetic variability?

Accepted Answer

A) further condensation of chromosomes 
B) genetic recombination between homologous chromosomes 
C) lots of mutations 
D) chromosomes lose lots of fragments 
E) gene duplication 
A) further condensation of chromosomes 
B) genetic recombination between homologous chromosomes 
C) lots of mutations 
D) chromosomes lose lots of fragments 
E) gene duplication

Which organelles become fragmented during mitosis in mammalian cells?

DNA replication and the production of additional histones occur during what part of the cell cycle?

When do most of the preparations for mitosis occur, including such activities as DNA replication?

The nuclear pore complexes are disassembled _________.

What evidence suggests that a cell spends the majority of its time in interphase?

During what stage do studies of mice and yeast cells suggest that DNA breaks leading to recombination begin?

As they separate, homologous chromosomes are seen to remain attached to each other at specific points by X-shaped structures at the crossover sites called _________.

The stages through which a cell passes from one cell division to the next constitute the _________.

What types of non-stem cells also engage in asymmetric or unequal divisions?

During which phase of meiosis do the kinetochores of sister chromatids face opposite poles as they line up in the center of the cells, with the centromeres of sister chromatids attached to chromosomal spindle fibers from opposite spindle poles?

The integrity of the nuclear membrane is disrupted _________.

What disease can be defined as resulting from a breakdown in a cell's ability to regulate its own division?

The process of centriole replication begins in the cytoplasm with the appearance of a small ________.

What triggers the start of centrosome duplication?

Synapsis is accompanied by the formation of a complex, ladder like structure made of three parallel bars with transverse protein filaments connecting its central element with two lateral elements. What is the name of this structure?

During which stage of meiosis do the chromosomes become recompacted after interkinesis?

Which of the cells below normally possess a relatively high level of mitotic activity?

Even before cytokinesis has been completed, the two centrioles of a daughter cell disengage, an event that is triggered by the enzyme _________, which becomes activated late in mitosis.

What occurs during pairing of chromosomes in prophase of meiosis I that increases genetic variability?

Introduction to the Study of Cell and Molecular Biology

The Chemical Basis of Life

Bioenergetics, Enzymes and Metabolism

The Structure and Function of the Plasma Membrane

Aerobic Respiration and the Mitochondrion

Photosynthesis and the Chloroplast

Interactions Between Cells and Their Environment

Cytoplasmic Membrane Systems: Structure, Function, and Membrane Trafficking

The Cytoskeleton and Cell Motility

The Nature of the Gene and the Genome

Gene Expression: From Transcription to Translation

Control of Gene Expression

Dna Replication and Repair

Cell Signaling and Signal Transduction: Communication Between Cells

Cancer

The Immune Response

Techniques in Cell and Molecular Biology

Filters

Exam 14: Cellular Reproduction

Which organelles become fragmented during mitosis in mammalian cells?

DNA replication and the production of additional histones occur during what part of the cell cycle?

When do most of the preparations for mitosis occur, including such activities as DNA replication?

The nuclear pore complexes are disassembled _________.

What evidence suggests that a cell spends the majority of its time in interphase?

During what stage do studies of mice and yeast cells suggest that DNA breaks leading to recombination begin?

As they separate, homologous chromosomes are seen to remain attached to each other at specific points by X-shaped structures at the crossover sites called _________.

The stages through which a cell passes from one cell division to the next constitute the _________.

What types of non-stem cells also engage in asymmetric or unequal divisions?

During which phase of meiosis do the kinetochores of sister chromatids face opposite poles as they line up in the center of the cells, with the centromeres of sister chromatids attached to chromosomal spindle fibers from opposite spindle poles?

The integrity of the nuclear membrane is disrupted _________.

What disease can be defined as resulting from a breakdown in a cell's ability to regulate its own division?

The process of centriole replication begins in the cytoplasm with the appearance of a small ________.

What triggers the start of centrosome duplication?

Synapsis is accompanied by the formation of a complex, ladder like structure made of three parallel bars with transverse protein filaments connecting its central element with two lateral elements. What is the name of this structure?

During which stage of meiosis do the chromosomes become recompacted after interkinesis?

Which of the cells below normally possess a relatively high level of mitotic activity?

Even before cytokinesis has been completed, the two centrioles of a daughter cell disengage, an event that is triggered by the enzyme _________, which becomes activated late in mitosis.

What occurs during pairing of chromosomes in prophase of meiosis I that increases genetic variability?

Introduction to the Study of Cell and Molecular Biology

The Chemical Basis of Life

Bioenergetics, Enzymes and Metabolism

The Structure and Function of the Plasma Membrane

Aerobic Respiration and the Mitochondrion

Photosynthesis and the Chloroplast

Interactions Between Cells and Their Environment

Cytoplasmic Membrane Systems: Structure, Function, and Membrane Trafficking

The Cytoskeleton and Cell Motility

The Nature of the Gene and the Genome

Gene Expression: From Transcription to Translation

Control of Gene Expression

Dna Replication and Repair

Cell Signaling and Signal Transduction: Communication Between Cells

Cancer

The Immune Response

Techniques in Cell and Molecular Biology

Filters