Question 1

What does each of the two daughter cells that result from normal mitotic division of the original parent cell contain?

Accepted Answer

A)  the same number of identical chromosomes and genes as the parent cell 
B)  one-half the number of chromosomes as the parent cell, but different genes 
C)  one-half of the number of identical chromosomes and genes as the parent cell 
D)  the same number of chromosomes as the parent cell, but different genes 
A)  the same number of identical chromosomes and genes as the parent cell 
B)  one-half the number of chromosomes as the parent cell, but different genes 
C)  one-half of the number of identical chromosomes and genes as the parent cell 
D)  the same number of chromosomes as the parent cell, but different genes

Question 2

What is the purpose of cell division in living organisms?

Accepted Answer

Multicellular organi

Question 3

Suppose that, once activated, an enzyme activates other enzymes in a cascade of events leading to apoptosis. Which of the following is this enzyme most likely?

Accepted Answer

A)  caspase 
B)  cytokinin 
C)  kinase 
D)  roscovitine 
A)  caspase 
B)  cytokinin 
C)  kinase 
D)  roscovitine

Question 4

Which of these phases of mitosis is used for karyotype analysis?

Accepted Answer

A)  prophase 
B)  anaphase 
C)  metaphase 
D)  prometaphase 
A)  prophase 
B)  anaphase 
C)  metaphase 
D)  prometaphase

Question 5

Which statement best explains contact inhibition?

Accepted Answer

A)  Contact between neighbouring cells triggers reactions that lead to inhibition of mitosis. 
B)  As cell number increases, the level of waste products increases, consequently slowing metabolism and leading to mitosis. 
C)  As cell number increases, the protein kinases they produce compete with neighbouring cells, thus inhibiting mitosis. 
D)  As neighbouring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur. 
A)  Contact between neighbouring cells triggers reactions that lead to inhibition of mitosis. 
B)  As cell number increases, the level of waste products increases, consequently slowing metabolism and leading to mitosis. 
C)  As cell number increases, the protein kinases they produce compete with neighbouring cells, thus inhibiting mitosis. 
D)  As neighbouring cells become more tightly packed together, their size is restricted and cytokinesis can no longer occur.

Question 6

Which of the following best compares animal and plant cell division?

Accepted Answer

A)  A cleavage furrow is found in plant cells, while cell plate is found in animal cells. 
B)  A cleavage furrow is found in animal cells, while a cell plate is found in plant cells. 
C)  A cleavage furrow is made possible by vesicles, while a cell plate is made possible by means of microtubules. 
D)  A cleavage furrow is made possible by vesicles, while a cell plate is made by means of the nucleus. 
A)  A cleavage furrow is found in plant cells, while cell plate is found in animal cells. 
B)  A cleavage furrow is found in animal cells, while a cell plate is found in plant cells. 
C)  A cleavage furrow is made possible by vesicles, while a cell plate is made possible by means of microtubules. 
D)  A cleavage furrow is made possible by vesicles, while a cell plate is made by means of the nucleus.

Question 7

What is another term for an identifiable structure known as the microtubule organizing centre (MTOC) of an animal cell?

Accepted Answer

A)  a cell plate 
B)  a centrosome 
C)  a kinetochore 
D)  a centromere 
A)  a cell plate 
B)  a centrosome 
C)  a kinetochore 
D)  a centromere

Question 8

Identify the stage of mitosis in which each activity occurs.
-Mitotic spindle disassembles.

Accepted Answer

A) prophase 
B) prometaphase 
C) metaphase 
D) anaphase 
E) telophase 
A) prophase 
B) prometaphase 
C) metaphase 
D) anaphase 
E) telophase

Question 9

Identify the stage of mitosis in which each activity occurs.
-Spindle fibre begins to form.

Accepted Answer

A) prophase 
B) prometaphase 
C) metaphase 
D) anaphase 
E) telophase 
A) prophase 
B) prometaphase 
C) metaphase 
D) anaphase 
E) telophase

Question 10

Suppose that, at the G2-to-M checkpoint, one of the cyclins has reached a concentration great enough to complex with one of the CDKs to initiate DNA synthesis. Which cyclin and which CDK are most likely involved?

Accepted Answer

A)  cyclin M and CDK1 
B)  cyclin S and CDK1 
C)  cyclin M and CDK2 
D)  cyclin S and CDK2 
A)  cyclin M and CDK1 
B)  cyclin S and CDK1 
C)  cyclin M and CDK2 
D)  cyclin S and CDK2

Question 11

Which of the following events occurs during interphase?

Accepted Answer

A)  formation of the spindle 
B)  alignment of chromosomes at the spindle midpoint 
C)  disappearance of the nuclear envelope 
D)  DNA synthesis 
A)  formation of the spindle 
B)  alignment of chromosomes at the spindle midpoint 
C)  disappearance of the nuclear envelope 
D)  DNA synthesis

Question 12

For each phrase, choose the most appropriate component of cell cycle regulation. Each component may be used once, more than once, or not at all.
-turns CDK on or off

Accepted Answer

A) CDK 
B) cyclins 
C) CDK/cyclin complex 
D) SPF 
A) CDK 
B) cyclins 
C) CDK/cyclin complex 
D) SPF

Question 13

What is the name of the specific region where replication of a bacterial chromosome begins?

Accepted Answer

A)  the rep 
B)  the ori 
C)  the ter 
D)  the beg 
A)  the rep 
B)  the ori 
C)  the ter 
D)  the beg

Question 14

How are the two chromosomes separated and distributed to the two ends of the cell during prokaryotic cell division?

Accepted Answer

A)  by an unknown mechanism 
B)  by attachment to separating membrane regions 
C)  by attachment to actin 
D)  by the action of the mitotic spindle 
A)  by an unknown mechanism 
B)  by attachment to separating membrane regions 
C)  by attachment to actin 
D)  by the action of the mitotic spindle

Question 15

Identify the stage of mitosis in which each activity occurs.
-Daughter chromosomes decondense and the nuclear envelope reforms.

Accepted Answer

A) prophase 
B) prometaphase 
C) metaphase 
D) anaphase 
E) telophase 
A) prophase 
B) prometaphase 
C) metaphase 
D) anaphase 
E) telophase

Question 16

Identify the stage of mitosis in which each activity occurs.
-Nuclear envelope disappears.

Accepted Answer

A) prophase 
B) prometaphase 
C) metaphase 
D) anaphase 
E) telophase 
A) prophase 
B) prometaphase 
C) metaphase 
D) anaphase 
E) telophase

Question 17

What are the two most likely reasons for cellular senescence (the loss of proliferative ability)?

Accepted Answer

A)  DNA damage and telomere lengthening 
B)  DNA damage and telomere shortening 
C)  DNA intactness and telomere shortening 
D)  DNA intactness and telomere lengthening 
A)  DNA damage and telomere lengthening 
B)  DNA damage and telomere shortening 
C)  DNA intactness and telomere shortening 
D)  DNA intactness and telomere lengthening

Question 18

Hereditary information is encoded in a single, circular DNA molecule in most prokaryotes. What is another feature of the prokaryotic hereditary information?

Accepted Answer

A)  The bacterial chromosomes do not have genes that control binary fission. 
B)  Bacterial cells cannot replicate their DNA very rapidly. 
C)  Bacterial cells do not utilize a mitotic spindle to segregate their replicated DNA. 
D)  The DNA of the bacterial chromosome is not replicated prior to segregation. 
A)  The bacterial chromosomes do not have genes that control binary fission. 
B)  Bacterial cells cannot replicate their DNA very rapidly. 
C)  Bacterial cells do not utilize a mitotic spindle to segregate their replicated DNA. 
D)  The DNA of the bacterial chromosome is not replicated prior to segregation.

Question 19

Signalling molecules, such as peptide hormones and growth factors, bind to receptors on the cell surface, which subsequently trigger reactions in the cell. Which of the following is among the reactions?

Accepted Answer

A)  causing cells to enter the G0 state 
B)  stopping cell division 
C)  initiating cell division 
D)  slowing the rate of cell division 
A)  causing cells to enter the G0 state 
B)  stopping cell division 
C)  initiating cell division 
D)  slowing the rate of cell division

Question 20

Contact inhibition is an important mechanism for maintaining cell growth in developed organs and tissues. Suppose that the organ and tissue cells remain in contact with each other. In order to prevent the cells from dividing, which phase of the cell cycle must they be in?

Accepted Answer

A)  in G1 
B)  in G0 
C)  in G2 
D)  in prophase 
A)  in G1 
B)  in G0 
C)  in G2 
D)  in prophase

Exam 7: Cell Cycles

What does each of the two daughter cells that result from normal mitotic division of the original parent cell contain?

What is the purpose of cell division in living organisms?

Suppose that, once activated, an enzyme activates other enzymes in a cascade of events leading to apoptosis. Which of the following is this enzyme most likely?

Which of these phases of mitosis is used for karyotype analysis?

Which statement best explains contact inhibition?

Which of the following best compares animal and plant cell division?

What is another term for an identifiable structure known as the microtubule organizing centre (MTOC) of an animal cell?

Identify the stage of mitosis in which each activity occurs. -Mitotic spindle disassembles.

Identify the stage of mitosis in which each activity occurs. -Spindle fibre begins to form.

Suppose that, at the G2-to-M checkpoint, one of the cyclins has reached a concentration great enough to complex with one of the CDKs to initiate DNA synthesis. Which cyclin and which CDK are most likely involved?

Which of the following events occurs during interphase?

For each phrase, choose the most appropriate component of cell cycle regulation. Each component may be used once, more than once, or not at all. -turns CDK on or off

What is the name of the specific region where replication of a bacterial chromosome begins?

How are the two chromosomes separated and distributed to the two ends of the cell during prokaryotic cell division?

Identify the stage of mitosis in which each activity occurs. -Daughter chromosomes decondense and the nuclear envelope reforms.

Identify the stage of mitosis in which each activity occurs. -Nuclear envelope disappears.

What are the two most likely reasons for cellular senescence (the loss of proliferative ability)?

Hereditary information is encoded in a single, circular DNA molecule in most prokaryotes. What is another feature of the prokaryotic hereditary information?

Signalling molecules, such as peptide hormones and growth factors, bind to receptors on the cell surface, which subsequently trigger reactions in the cell. Which of the following is among the reactions?

Contact inhibition is an important mechanism for maintaining cell growth in developed organs and tissues. Suppose that the organ and tissue cells remain in contact with each other. In order to prevent the cells from dividing, which phase of the cell cycle must they be in?

Light and Life

The Cell: an Overview

Energy and Enzymes

Cell Membranes and Signaling

Cellular Respiration

Photosynthesis

Genetic Recombination

The Chromosomal Basis of Mendelian Inheritance

Genetic Linkage, Sex-Linkage, and Other Non-Mendelian Inheritance Mechanisms

DNA Structure, Replication, and Repair

Gene Structure Expression, and Mutation

Regulation of Gene Expression

Dna Technologies

Genomes

Evolution: the Development of the Theory

Microevolution: Changes Within Populations

Speciation and Macroevolution

Systematics and Phylogenetics: Revealing the Tree of Life

Humans and Evolution

Defining Life and Its Origins

Viruses, Viroids, and Prions: Infectious Biological Particles

Bacteria and Archaea

Protists

Fungi

Plants

Animals

Conservation of Biodiversity

Population Ecology

Species Interactions and Community Ecology

Ecosystems

Animal Behaviour

Organization of the Plant Body

Transport in Plants

Reproduction and Development in Flowering Plants

Plant Nutrition

Plant Signals and Responses to the Environment

Introduction to Animal Organization and Physiology

Animal Nutrition

Gas Exchange: the Respiratory System

Internal Transport: the Circulatory System

Regulation of the Internal Environment: Water, Solutes, and Temperature

Control of Animal Processes: Endocrine Control

Animal Reproduction

Control of Animal Processes: Neural Control

Muscles, Skeletons, and Body Movements

Filters

Suppose that, at the G₂-to-M checkpoint, one of the cyclins has reached a concentration great enough to complex with one of the CDKs to initiate DNA synthesis. Which cyclin and which CDK are most likely involved?