Question 1

In the cells of some organisms,mitosis occurs without cytokinesis.This will result in

Accepted Answer

A) cells with more than one nucleus. 
B) cells that are unusually small. 
C) cells lacking nuclei. 
D) destruction of chromosomes. 
E) cell cycles lacking an S phase. 
A) cells with more than one nucleus. 
B) cells that are unusually small. 
C) cells lacking nuclei. 
D) destruction of chromosomes. 
E) cell cycles lacking an S phase.

Question 2

Successfully growing cells in a culture requires the researcher to understand

Accepted Answer

A) quorum sensing. 
B) mitosis. 
C) anchorage dependence. 
D) the cell cycle. 
E) biochemistry. 
A) quorum sensing. 
B) mitosis. 
C) anchorage dependence. 
D) the cell cycle. 
E) biochemistry.

Question 3

-If the cell whose nuclear material is shown in the figure above continues toward completion of mitosis,which of the following events would occur next?

Accepted Answer

A) cell membrane synthesis 
B) spindle fibre formation 
C) nuclear envelope breakdown 
D) formation of telophase nuclei 
E) synthesis of chromatids 
A) cell membrane synthesis 
B) spindle fibre formation 
C) nuclear envelope breakdown 
D) formation of telophase nuclei 
E) synthesis of chromatids

Question 4

Which of the following is released by platelets in the vicinity of an injury?

Accepted Answer

A) PDGF 
B) MPF 
C) protein kinase 
D) cyclin 
E) Cdk 
A) PDGF 
B) MPF 
C) protein kinase 
D) cyclin 
E) Cdk

Question 5

What is the microtubule-organizing center known as?

Accepted Answer

A) microtubulere 
B) centrosome 
C) centromere 
D) kinetochore 
E) chromatid 
A) microtubulere 
B) centrosome 
C) centromere 
D) kinetochore 
E) chromatid

Question 6

The following questions are based on the following figure.
  
-Which number represents the point in the cell cycle during which the chromosomes are replicated?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 7

Movement of the chromosomes during anaphase would be most affected by a drug that

Accepted Answer

A) reduces cyclin concentrations. 
B) increases cyclin concentrations. 
C) prevents elongation of microtubules. 
D) prevents shortening of microtubules. 
E) prevents attachment of the microtubules to the kinetochore. 
A) reduces cyclin concentrations. 
B) increases cyclin concentrations. 
C) prevents elongation of microtubules. 
D) prevents shortening of microtubules. 
E) prevents attachment of the microtubules to the kinetochore.

Question 8

The following questions are based on the following figure.
  
-Which number represents DNA synthesis?

Accepted Answer

A) I 
B) II 
C) III 
D) IV 
E) V 
A) I 
B) II 
C) III 
D) IV 
E) V

Question 9

A particular cell has half as much DNA as some other cells in a mitotically active tissue.The cell in question is most likely in

Accepted Answer

A) G₁. 
B) G₂. 
C) prophase. 
D) metaphase. 
E) anaphase. 
A) G₁. 
B) G₂. 
C) prophase. 
D) metaphase. 
E) anaphase.

Question 10

Which of the following does not occur during mitosis?

Accepted Answer

A) condensation of the chromosomes 
B) replication of the DNA 
C) separation of sister chromatids 
D) spindle formation 
E) separation of the spindle poles 
A) condensation of the chromosomes 
B) replication of the DNA 
C) separation of sister chromatids 
D) spindle formation 
E) separation of the spindle poles

Question 11

Some cells have several nuclei per cell.How could such multinucleated cells be explained?

Accepted Answer

A) The cells underwent repeated cytokinesis but no mitosis. 
B) The cells underwent repeated mitosis with simultaneous cytokinesis. 
C) The cells underwent repeated mitosis, but cytokinesis did not occur. 
D) The cells had multiple S phases before it entered mitosis. 
E) The cells did not enter mitosis. 
A) The cells underwent repeated cytokinesis but no mitosis. 
B) The cells underwent repeated mitosis with simultaneous cytokinesis. 
C) The cells underwent repeated mitosis, but cytokinesis did not occur. 
D) The cells had multiple S phases before it entered mitosis. 
E) The cells did not enter mitosis.

Question 12

Nucleotides can be radiolabelled before they are incorporated into newly forming DNA and can therefore be assayed to track their incorporation.In a set of experiments,a student-faculty research team used labelled T nucleotides and introduced these into the culture of dividing human cells at specific times.
-The research team used the setup to study the incorporation of labelled nucleotides into a culture of lymphocytes and found that the lymphocytes incorporated the labelled nucleotide at a significantly higher level after a pathogen was introduced into the culture.They concluded that

Accepted Answer

A) the presence of the pathogen made the experiment too contaminated to trust the results. 
B) their tissue culture methods needed to be relearned. 
C) infection causes lymphocytes to divide more rapidly. 
D) infection causes cell cultures in general to reproduce more rapidly. 
E) infection causes lymphocyte cultures to skip some parts of the cell cycle. 
A) the presence of the pathogen made the experiment too contaminated to trust the results. 
B) their tissue culture methods needed to be relearned. 
C) infection causes lymphocytes to divide more rapidly. 
D) infection causes cell cultures in general to reproduce more rapidly. 
E) infection causes lymphocyte cultures to skip some parts of the cell cycle.

Question 13

Which of the following is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

Accepted Answer

A) PDGF 
B) MPF 
C) protein kinase 
D) cyclin 
E) Cdk 
A) PDGF 
B) MPF 
C) protein kinase 
D) cyclin 
E) Cdk

Question 14

Once a cell completes mitosis,molecular division triggers must be turned off.What happens to MPF during mitosis?

Accepted Answer

A) It is completely degraded. 
B) It is exported from the cell. 
C) The cyclin component of MPF is degraded. 
D) The Cdk component of MPF is degraded and exported from the cell. 
E) It is phosphorylated. 
A) It is completely degraded. 
B) It is exported from the cell. 
C) The cyclin component of MPF is degraded. 
D) The Cdk component of MPF is degraded and exported from the cell. 
E) It is phosphorylated.

Question 15

During which phase of mitosis do the chromatids become chromosomes?

Accepted Answer

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

Question 16

What is a cleavage furrow?

Accepted Answer

A) a ring of vesicles forming a cell plate 
B) the separation of divided prokaryotes 
C) a groove in the plasma membrane between daughter nuclei 
D) the metaphase plate where chromosomes attach to the spindle 
E) the space that is created between two chromatids during anaphase 
A) a ring of vesicles forming a cell plate 
B) the separation of divided prokaryotes 
C) a groove in the plasma membrane between daughter nuclei 
D) the metaphase plate where chromosomes attach to the spindle 
E) the space that is created between two chromatids during anaphase

Question 17

Use the following information to answer the questions below.
A student is looking through his light microscope (~450 X)at a squashed and stained onion root tip.Some,but not all,of the cells have clearly visible chromosome strands.
-When a cell is in anaphase of mitosis,which of the following will he see?

Accepted Answer

A) a clear area in the centre of the cell 
B) chromosomes clustered at the poles 
C) individual chromatids separating 
D) chromosomes clustered tightly at the centre 
E) formation of vesicles at the midline 
A) a clear area in the centre of the cell 
B) chromosomes clustered at the poles 
C) individual chromatids separating 
D) chromosomes clustered tightly at the centre 
E) formation of vesicles at the midline

Question 18

What does MPF consist of?

Accepted Answer

A) a growth factor and mitotic factor 
B) ATP synthetase and a protease 
C) cyclin and tubulin 
D) cyclin and a cyclin-dependent kinase 
E) ATPase and kinase 
A) a growth factor and mitotic factor 
B) ATP synthetase and a protease 
C) cyclin and tubulin 
D) cyclin and a cyclin-dependent kinase 
E) ATPase and kinase

Question 19

You observe cells under the microscope and notice that,as they undergo mitosis,the nucleus remains intact.You conclude that these cells are

Accepted Answer

A) animal cells. 
B) plant cells. 
C) bacteria. 
D) diatoms. 
E) tumour cells. 
A) animal cells. 
B) plant cells. 
C) bacteria. 
D) diatoms. 
E) tumour cells.

Question 20

What is metaphase characterized by?

Accepted Answer

A) aligning of chromosomes on the equator 
B) splitting of the centromeres 
C) cytokinesis 
D) separation of sister chromatids 
E) replication of DNA 
A) aligning of chromosomes on the equator 
B) splitting of the centromeres 
C) cytokinesis 
D) separation of sister chromatids 
E) replication of DNA

Exam 12: The Cell Cycle

In the cells of some organisms,mitosis occurs without cytokinesis.This will result in

Successfully growing cells in a culture requires the researcher to understand

-If the cell whose nuclear material is shown in the figure above continues toward completion of mitosis,which of the following events would occur next?

Which of the following is released by platelets in the vicinity of an injury?

What is the microtubule-organizing center known as?

The following questions are based on the following figure. -Which number represents the point in the cell cycle during which the chromosomes are replicated?

Movement of the chromosomes during anaphase would be most affected by a drug that

The following questions are based on the following figure. -Which number represents DNA synthesis?

A particular cell has half as much DNA as some other cells in a mitotically active tissue.The cell in question is most likely in

Which of the following does not occur during mitosis?

Some cells have several nuclei per cell.How could such multinucleated cells be explained?

Which of the following is a protein synthesized at specific times during the cell cycle that associates with a kinase to form a catalytically active complex?

Once a cell completes mitosis,molecular division triggers must be turned off.What happens to MPF during mitosis?

During which phase of mitosis do the chromatids become chromosomes?

What is a cleavage furrow?

What does MPF consist of?

You observe cells under the microscope and notice that,as they undergo mitosis,the nucleus remains intact.You conclude that these cells are

What is metaphase characterized by?

Introduction: Evolution and Themes of Biology

The Chemical Context of Life

Water and Life

Carbon and the Molecular Diversity of Life

The Structure and Function of Large Biological Molecules

A Tour of the Cell

Membrane Structure and Function

An Introduction to Metabolism

Cellular Respiration and Fermentation

Photosynthesis

Cell Communication

Meiosis and Sexual Life Cycles

Mendel and the Gene Idea

The Chromosomal Basis of Inheritance

The Molecular Basis of Inheritance

From Gene to Protein

Regulation of Gene Expression

Viruses

DNA Tools and Biotechnology

Genomes and Their Evolution

Descent with Modification: A Darwinian View of Life

The Evolution of Populations

The Origin of Species

The History of Life on Earth

Phylogeny and the Tree of Life

Bacteria and Archaea

Protists

Plant Diversity I: How Plants Colonized Land

Plant Diversity II: The Evolution of Seed Plants

Fungi

An Overview of Animal Diversity

An Introduction to Invertebrates

The Origin and Evolution of Vertebrates

Plant Structure,Growth,and Development

Resource Acquisition and Transport in Vascular Plants

Soil and Plant Nutrition

Angiosperm Reproduction and Biotechnology

Plant Responses to Internal and External Signals

Basic Principles of Animal Form and Function

Animal Nutrition

Circulation and Gas Exchange

The Immune System

Osmoregulation and Excretion

Hormones and the Endocrine System

Animal Reproduction

Animal Development

Neurons,Synapses,and Signalling

Nervous Systems

Sensory and Motor Mechanisms

Animal Behaviour

An Introduction to Ecology and the Biosphere

Population Ecology

Community Ecology

Ecosystems and Restoration Ecology

Conservation Biology and Global Change

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