Question 1

In flowering plants,an event known as double fertilization occurs when _____.

Accepted Answer

A) two sperm enter the ovule;one fertilizes the egg,and the other fertilizes a 2n cell to generate endosperm 
B) two sperm cells fertilize one normal egg cell to make a 3n embryo,and the embryo later becomes 2n during a unique mitotic division 
C) two eggs are simultaneously fertilized by two sperm nuclei 
D) None of the above apply. 
A) two sperm enter the ovule;one fertilizes the egg,and the other fertilizes a 2n cell to generate endosperm 
B) two sperm cells fertilize one normal egg cell to make a 3n embryo,and the embryo later becomes 2n during a unique mitotic division 
C) two eggs are simultaneously fertilized by two sperm nuclei 
D) None of the above apply. A

Question 2

The floral meristem in flowering plants develops from the shoot apical meristem,which usually produces leaves.Which floral part is not a modified leaf?

Accepted Answer

A) sepal 
B) carpel 
C) stamen 
D) pollen tube 
E) petal 
A) sepal 
B) carpel 
C) stamen 
D) pollen tube 
E) petal D

Question 3

The auxin produced in Arabidopsis embryos and Bicoid protein produced in Drosophila embryos have what similar function?

Accepted Answer

A) Both are regulatory transcription factors that serve as cell-to-cell signals. 
B) Both are cytoplasmic determinants they are loaded into eggs by cells in the mother or by female reproductive tissues. 
C) Both trigger the transcription of homeotic loci genes that specify the types of structures produced at a certain position. 
D) Both establish a concentration gradient that demarcates the anterior-posterior axis. 
A) Both are regulatory transcription factors that serve as cell-to-cell signals. 
B) Both are cytoplasmic determinants they are loaded into eggs by cells in the mother or by female reproductive tissues. 
C) Both trigger the transcription of homeotic loci genes that specify the types of structures produced at a certain position. 
D) Both establish a concentration gradient that demarcates the anterior-posterior axis. B

Question 4

The basal cell in a plant embryo _____.

Accepted Answer

A) develops from the root of the embryo 
B) forms the suspensor that anchors the embryo 
C) differentiates after gastrulation 
D) divides to form cotyledons 
E) divides to form hypocotyls 
A) develops from the root of the embryo 
B) forms the suspensor that anchors the embryo 
C) differentiates after gastrulation 
D) divides to form cotyledons 
E) divides to form hypocotyls

Question 5

One unique feature of fertilization in flowering plants compared with animals is that _____.

Accepted Answer

A) plant sperm are motile 
B) multiple ovules exist in the ovary 
C) the process involves double fertilization 
D) nuclear fusion does not take place 
E) the gametes are diploid,not haploid 
A) plant sperm are motile 
B) multiple ovules exist in the ovary 
C) the process involves double fertilization 
D) nuclear fusion does not take place 
E) the gametes are diploid,not haploid

Question 6

Plant embryos cannot undergo gastrulation.What ensures the correct positioning of cells during plant embryogenesis?

Accepted Answer

A) cell movements inside the seed coat 
B) genetic differences among the cells 
C) cytoplasmic determinants in the cells 
D) different cell sizes and planes of mitosis 
E) expansion of the cotyledons 
A) cell movements inside the seed coat 
B) genetic differences among the cells 
C) cytoplasmic determinants in the cells 
D) different cell sizes and planes of mitosis 
E) expansion of the cotyledons

Question 7

Plant and animal development share a number of features,but differ in major ways as well.Which of the following best summarizes the similarities between the two forms of development?

Accepted Answer

A) Both plants and animals develop from a process of single fertilization. 
B) Both plants and animals produce specialized tissues through irreversible processes of determination and differentiation. 
C) Both plants and animals produce gametes via meiosis followed by mitosis of haploid cells. 
D) Both plant and animal development depend on precise control of gene expression in time and in space. 
A) Both plants and animals develop from a process of single fertilization. 
B) Both plants and animals produce specialized tissues through irreversible processes of determination and differentiation. 
C) Both plants and animals produce gametes via meiosis followed by mitosis of haploid cells. 
D) Both plant and animal development depend on precise control of gene expression in time and in space.

Question 8

Plant and animal development share a number of features,but differ in major ways as well.Which of the following best summarizes the differences between the two forms of development?

Accepted Answer

A) Animal tissues are irreversibly differentiated;plant tissues retain plasticity throughout life. 
B) Animal cells frequently undergo programmed cell death;plant cells do not. 
C) Animal development is controlled by regulatory gene sets such as Hox genes;plants have no similar control systems. 
D) Animal gametes are produced only after maturity is reached;plant gametes can be produced throughout a plant's lifetime. 
A) Animal tissues are irreversibly differentiated;plant tissues retain plasticity throughout life. 
B) Animal cells frequently undergo programmed cell death;plant cells do not. 
C) Animal development is controlled by regulatory gene sets such as Hox genes;plants have no similar control systems. 
D) Animal gametes are produced only after maturity is reached;plant gametes can be produced throughout a plant's lifetime.

Question 9

Auxin has an effect on plant embryos much like the Bicoid protein in Drosophila.If auxin were added to a culture of embryonic root cells,what would be the likely result?

Accepted Answer

A) Root cells would elongate and mature. 
B) Root cells would change into meristem cells. 
C) Root cells would halt their development. 
D) Root cells would not respond to auxin. 
A) Root cells would elongate and mature. 
B) Root cells would change into meristem cells. 
C) Root cells would halt their development. 
D) Root cells would not respond to auxin.

Question 10

What does the ABC model of flower development attempt to explain?

Accepted Answer

A) how different combinations of gene products trigger the formation of different floral organs 
B) why petals are found on the inside of the whorl of sepals instead of on the outside 
C) why the four types of floral organs occur in whorls 
D) why apical meristems are converted to floral meristems in response to specific cell-to-cell signals 
A) how different combinations of gene products trigger the formation of different floral organs 
B) why petals are found on the inside of the whorl of sepals instead of on the outside 
C) why the four types of floral organs occur in whorls 
D) why apical meristems are converted to floral meristems in response to specific cell-to-cell signals

Question 11

The ABC genes in Arabidopsis are considered homeotic genes.What could be a reason for this classification?

Accepted Answer

A) Each of the three genes codes for a different flower organ. 
B) Each gene codes for regulatory transcription factors. 
C) Each gene is similar in sequence to homeotic genes in Drosophila. 
D) Each gene codes for proteins similar to Hox genes in mice. 
E) Each gene directs different kinds of morphogenesis. 
A) Each of the three genes codes for a different flower organ. 
B) Each gene codes for regulatory transcription factors. 
C) Each gene is similar in sequence to homeotic genes in Drosophila. 
D) Each gene codes for proteins similar to Hox genes in mice. 
E) Each gene directs different kinds of morphogenesis.

Question 12

The monopterous gene in Arabidopsis encodes a protein that is similar in its function to which animal protein?

Accepted Answer

A) MyoD in frog embryos 
B) Bicoid in fruit-fly embryos 
C) keratin in human embryos 
A) MyoD in frog embryos 
B) Bicoid in fruit-fly embryos 
C) keratin in human embryos

Question 13

Each of the following describes a similarity between yolk and endosperm except _____.

Accepted Answer

A) yolk and endosperm both provide nutrition for embryos 
B) yolk and endosperm both contain proteins 
C) yolk and endosperm are both the result of a second fertilization process 
D) yolk and endosperm are both cellular products 
A) yolk and endosperm both provide nutrition for embryos 
B) yolk and endosperm both contain proteins 
C) yolk and endosperm are both the result of a second fertilization process 
D) yolk and endosperm are both cellular products

Question 14

Meristematic tissue cells in plants are most similar to which kind of cells in animals?

Accepted Answer

A) somite cells 
B) ectodermal cells 
C) embryonic stem cells 
D) mesodermal cells 
A) somite cells 
B) ectodermal cells 
C) embryonic stem cells 
D) mesodermal cells

Question 15

Organs in developing flowers include all of the following except _____.

Accepted Answer

A) whorls 
B) sepals 
C) petals 
D) carpels 
E) stamens 
A) whorls 
B) sepals 
C) petals 
D) carpels 
E) stamens

Question 16

Plant embryos do not undergo the developmental processes of _____.

Accepted Answer

A) fertilization 
B) cleavage 
C) embryogenesis 
D) gastrulation 
E) organogenesis 
A) fertilization 
B) cleavage 
C) embryogenesis 
D) gastrulation 
E) organogenesis

Question 17

Many flowering plant species have elaborate mechanisms to prevent an individual's pollen from fertilizing its own egg cells.Why?

Accepted Answer

A) to prevent inbreeding 
B) to prevent polyspermy 
C) to prevent cross-species fertilization and the production of dysfunctional hybrid offspring 
D) to prevent double fertilization and the formation of endosperm 
A) to prevent inbreeding 
B) to prevent polyspermy 
C) to prevent cross-species fertilization and the production of dysfunctional hybrid offspring 
D) to prevent double fertilization and the formation of endosperm

Question 18

The ABC model of flower development suggests that genes A,B,and C _____.

Accepted Answer

A) each code for the formation of a different flower organ 
B) may work alone or together to form different flower organs 
C) may transform one organ into another when inactivated 
D) may work alone or together to form different flower organs and may transform one organ into another when inactivated 
E) Each of the three genes codes for the formation of a different flower organ and may transform one organ into another when inactivated. 
A) each code for the formation of a different flower organ 
B) may work alone or together to form different flower organs 
C) may transform one organ into another when inactivated 
D) may work alone or together to form different flower organs and may transform one organ into another when inactivated 
E) Each of the three genes codes for the formation of a different flower organ and may transform one organ into another when inactivated.

Question 19

Interactions between proteins on the surface of the pollen grain and on the surface of the stigma are necessary for fertilization to proceed.What is the correct sequence of events that follow this interaction?

Accepted Answer

A) growth of pollen tube,double fertilization,formation of sperm 
B) formation of sperm,growth of pollen tube,double fertilization 
C) double fertilization,growth of pollen tube,formation of sperm 
D) formation of sperm,double fertilization,growth of pollen tube 
E) growth of pollen tube,formation of sperm,double fertilization 
A) growth of pollen tube,double fertilization,formation of sperm 
B) formation of sperm,growth of pollen tube,double fertilization 
C) double fertilization,growth of pollen tube,formation of sperm 
D) formation of sperm,double fertilization,growth of pollen tube 
E) growth of pollen tube,formation of sperm,double fertilization

Question 20

In the early plant embryo,cells divide asymmetrically.Which structure does not result from divisions of the apical cell?

Accepted Answer

A) the suspensor 
B) the cotyledons 
C) the hypocotyls 
D) the shoot 
A) the suspensor 
B) the cotyledons 
C) the hypocotyls 
D) the shoot

Exam 23: An Introduction to Plant Development

In flowering plants,an event known as double fertilization occurs when _____.

The floral meristem in flowering plants develops from the shoot apical meristem,which usually produces leaves.Which floral part is not a modified leaf?

The auxin produced in Arabidopsis embryos and Bicoid protein produced in Drosophila embryos have what similar function?

The basal cell in a plant embryo _____.

One unique feature of fertilization in flowering plants compared with animals is that _____.

Plant embryos cannot undergo gastrulation.What ensures the correct positioning of cells during plant embryogenesis?

Plant and animal development share a number of features,but differ in major ways as well.Which of the following best summarizes the similarities between the two forms of development?

Plant and animal development share a number of features,but differ in major ways as well.Which of the following best summarizes the differences between the two forms of development?

Auxin has an effect on plant embryos much like the Bicoid protein in Drosophila.If auxin were added to a culture of embryonic root cells,what would be the likely result?

What does the ABC model of flower development attempt to explain?

The ABC genes in Arabidopsis are considered homeotic genes.What could be a reason for this classification?

The monopterous gene in Arabidopsis encodes a protein that is similar in its function to which animal protein?

Each of the following describes a similarity between yolk and endosperm except _____.

Meristematic tissue cells in plants are most similar to which kind of cells in animals?

Organs in developing flowers include all of the following except _____.

Plant embryos do not undergo the developmental processes of _____.

Many flowering plant species have elaborate mechanisms to prevent an individual's pollen from fertilizing its own egg cells.Why?

The ABC model of flower development suggests that genes A,B,and C _____.

Interactions between proteins on the surface of the pollen grain and on the surface of the stigma are necessary for fertilization to proceed.What is the correct sequence of events that follow this interaction?

In the early plant embryo,cells divide asymmetrically.Which structure does not result from divisions of the apical cell?

Biology and the Tree of Life

Water and Carbon: the Chemical Basis of Life

Protein Structure and Function

Nucleic Acids and the Rna World

An Introduction to Carbohydrates

Lipids, membranes, and the First Cells

Inside the Cell

Cell-Cell Interactions

Cellular Respiration and Fermentation

Photosynthesis

The Cell Cycle

Meiosis

Mendel and the Gene

Dna and the Gene: Synthesis and Repair

How Genes Work

Transcription and Translation

Control of Gene Expression in Bacteria

Control of Gene Expression in Eukaryotes

Analyzing and Engineering Genes

Genomics

Principles of Development

An Introduction to Animal Development

Evolution by Natural Selection

Evolutionary Processes

Speciation

Phylogenies and the History of Life

Bacteria and Archaea

Protists

Green Plants

Fungi

An Introduction to Animals

Protostome Animals

Deuterostome Animals

Viruses

Plant Form and Function

Water and Sugar Transport in Plants

Plant Nutrition

Plant Sensory Systems, signals, and Responses

Plant Reproduction

Animal Form and Function

Water and Electrolyte Balance in Animals

Animal Nutrition

Gas Exchange and Circulation

Electrical Signals in Animals

Animal Sensory Systems and Movement

Chemical Signals in Animals

Animal Reproduction

The Immune System in Animals

An Introduction to Ecology

Behavioral Ecology

Population Ecology

Community Ecology

Ecosystems

Biodiversity and Conservation Biology

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