Question 1

Hans Spemann and colleagues developed the concept of the primary organizer in amphibian embryos while studying the

Accepted Answer

A) medial cells between the optic cups. 
B) anterior terminus of the notochord. 
C) lateral margins of the neural tube. 
D) posterior edge of the dorsal ectoderm. 
E) dorsal lip of the blastopore. 
A) medial cells between the optic cups. 
B) anterior terminus of the notochord. 
C) lateral margins of the neural tube. 
D) posterior edge of the dorsal ectoderm. 
E) dorsal lip of the blastopore. E

Question 2

If the apical ectodermal ridge is surgically removed from an embryo,it will lose

Accepted Answer

A) positional information for limb-bud pattern formation. 
B) guidance signals needed for correct gastrulation. 
C) unequal cytokinesis of blastomeres. 
D) the developmental substrate for the gonads. 
E) the developmental substrate for the kidneys. 
A) positional information for limb-bud pattern formation. 
B) guidance signals needed for correct gastrulation. 
C) unequal cytokinesis of blastomeres. 
D) the developmental substrate for the gonads. 
E) the developmental substrate for the kidneys. A

Question 3

Use the following information to answer the next few questions.
In a study of the development of frog embryos,researchers stained several early gastrulas with vital dyes and noted the locations of the dyes after gastrulation.The results are shown in the following table.
  
-The endoderm was probably stained with

Accepted Answer

A) red and yellow colours. 
B) yellow and green colours. 
C) green and purple colours. 
D) blue and yellow colours. 
E) purple and red colours. 
A) red and yellow colours. 
B) yellow and green colours. 
C) green and purple colours. 
D) blue and yellow colours. 
E) purple and red colours. C

Question 4

Syndactyly,a congenital abnormality in which webbing is present between fingers and toes,can be corrected after birth.In utero,the cells comprising the webbing failed to undergo

Accepted Answer

A) differentiation. 
B) gastrulation. 
C) apoptosis. 
D) convergent extension. 
E) morphogenesis. 
A) differentiation. 
B) gastrulation. 
C) apoptosis. 
D) convergent extension. 
E) morphogenesis.

Question 5

In frog embryos,the blastopore becomes the

Accepted Answer

A) anus. 
B) ears. 
C) eyes. 
D) nose. 
E) mouth. 
A) anus. 
B) ears. 
C) eyes. 
D) nose. 
E) mouth.

Question 6

The earliest developmental stage among these choices is

Accepted Answer

A) germ layers. 
B) morula. 
C) blastopore. 
D) gastrulation. 
E) invagination. 
A) germ layers. 
B) morula. 
C) blastopore. 
D) gastrulation. 
E) invagination.

Question 7

Among these choices,the largest cell involved in frog reproduction is

Accepted Answer

A) the spermatozoon. 
B) the ovum. 
C) a blastomere in the vegetal pole. 
D) a blastomere in the animal pole. 
E) one of the products of the first cleavage. 
A) the spermatozoon. 
B) the ovum. 
C) a blastomere in the vegetal pole. 
D) a blastomere in the animal pole. 
E) one of the products of the first cleavage.

Question 8

Select the choice that correctly associates the organ with its embryonic sources.

Accepted Answer

A) anterior pituitary gland-mesoderm and endoderm 
B) thyroid gland-mesoderm and ectoderm 
C) adrenal gland-ectoderm and mesoderm 
D) skin-endoderm and mesoderm 
E) brain-mesoderm and endoderm 
A) anterior pituitary gland-mesoderm and endoderm 
B) thyroid gland-mesoderm and ectoderm 
C) adrenal gland-ectoderm and mesoderm 
D) skin-endoderm and mesoderm 
E) brain-mesoderm and endoderm

Question 9

Testgen questions still do not copy to other applications.

Accepted Answer

A) blastula → gastrula → cleavage 
B) cleavage → gastrula → blastula 
C) cleavage → blastula → gastrula 
D) gastrula → blastula → cleavage 
A) blastula → gastrula → cleavage 
B) cleavage → gastrula → blastula 
C) cleavage → blastula → gastrula 
D) gastrula → blastula → cleavage

Question 10

Use the following information to answer the next few questions.
In a study of the development of frog embryos,researchers stained several early gastrulas with vital dyes and noted the locations of the dyes after gastrulation.The results are shown in the following table.
  
-The ectoderm should give rise to tissues containing

Accepted Answer

A) yellow and purple colours. 
B) purple and green colours. 
C) green and red colours. 
D) red and blue colours. 
E) red and yellow colours. 
A) yellow and purple colours. 
B) purple and green colours. 
C) green and red colours. 
D) red and blue colours. 
E) red and yellow colours.

Question 11

What structural adaptation in chickens allows them to lay their eggs in arid environments rather than in water?

Accepted Answer

A) extraembryonic membranes 
B) yolk 
C) cleavage 
D) gastrulation 
E) development of the brain from ectoderm 
A) extraembryonic membranes 
B) yolk 
C) cleavage 
D) gastrulation 
E) development of the brain from ectoderm

Question 12

The archenteron develops into

Accepted Answer

A) the mesoderm. 
B) the blastocoel. 
C) the endoderm. 
D) the placenta. 
E) the lumen of the digestive tract. 
A) the mesoderm. 
B) the blastocoel. 
C) the endoderm. 
D) the placenta. 
E) the lumen of the digestive tract.

Question 13

Although it contributes no cells to the embryo,the formation of the primitive streak is guided by the structure known as the

Accepted Answer

A) endoderm. 
B) mesoderm. 
C) ectoderm. 
D) neural crest. 
E) hypoblast. 
A) endoderm. 
B) mesoderm. 
C) ectoderm. 
D) neural crest. 
E) hypoblast.

Question 14

With regard to the establishment of an anterior-posterior axis,which of the following pairs is incorrect?

Accepted Answer

A) 
C)  elegans - convergent elongation of P granules 
B) mammal - orientation of egg and sperm nuclei before fusion 
C) insects - morphogen gradients 
D) frog - asymmetry in the animal vegetal hemispheres 
E) chick - gravity as the egg travels down the oviduct 
A) 
C)  elegans - convergent elongation of P granules 
B) mammal - orientation of egg and sperm nuclei before fusion 
C) insects - morphogen gradients 
D) frog - asymmetry in the animal vegetal hemispheres 
E) chick - gravity as the egg travels down the oviduct

Question 15

Which of the following is common to the development of both birds and mammals?

Accepted Answer

A) holoblastic cleavage 
B) epiblast and hypoblast 
C) trophoblast 
D) yolk plug 
E) grey crescent 
A) holoblastic cleavage 
B) epiblast and hypoblast 
C) trophoblast 
D) yolk plug 
E) grey crescent

Question 16

The vertebrate ectoderm is the origin of the

Accepted Answer

A) nervous system. 
B) liver. 
C) pancreas. 
D) heart. 
E) kidneys. 
A) nervous system. 
B) liver. 
C) pancreas. 
D) heart. 
E) kidneys.

Question 17

The arrangement of organs and tissues in their characteristic places in 3-D space defines

Accepted Answer

A) pattern formation. 
B) induction. 
C) differentiation. 
D) determination. 
E) organogenesis. 
A) pattern formation. 
B) induction. 
C) differentiation. 
D) determination. 
E) organogenesis.

Question 18

Which membranes fuse first during fertilization?

Accepted Answer

A) cortical granule membrane and egg plasma membrane 
B) vitelline layer and sperm plasma membrane 
C) sperm plasma membrane and cortical granule membrane 
D) sperm plasma membrane and egg plasma membrane 
E) jelly coat and sperm plasma membrane 
A) cortical granule membrane and egg plasma membrane 
B) vitelline layer and sperm plasma membrane 
C) sperm plasma membrane and cortical granule membrane 
D) sperm plasma membrane and egg plasma membrane 
E) jelly coat and sperm plasma membrane

Question 19

A primitive streak forms during the early embryonic development of

Accepted Answer

A) birds, but not frogs or humans. 
B) frogs, but not birds or humans. 
C) humans, but not birds or frogs. 
D) birds and frogs, but not humans. 
E) humans and birds, but not frogs. 
A) birds, but not frogs or humans. 
B) frogs, but not birds or humans. 
C) humans, but not birds or frogs. 
D) birds and frogs, but not humans. 
E) humans and birds, but not frogs.

Question 20

Cells transplanted from the neural tube of a frog embryo to the ventral part of another embryo develop into nervous system tissues.This result indicates that the transplanted cells were

Accepted Answer

A) totipotent. 
B) determined. 
C) differentiated. 
D) mesenchymal. 
E) apoptotic. 
A) totipotent. 
B) determined. 
C) differentiated. 
D) mesenchymal. 
E) apoptotic.

Exam 47: Animal Development

Hans Spemann and colleagues developed the concept of the primary organizer in amphibian embryos while studying the

If the apical ectodermal ridge is surgically removed from an embryo,it will lose

Syndactyly,a congenital abnormality in which webbing is present between fingers and toes,can be corrected after birth.In utero,the cells comprising the webbing failed to undergo

In frog embryos,the blastopore becomes the

The earliest developmental stage among these choices is

Among these choices,the largest cell involved in frog reproduction is

Select the choice that correctly associates the organ with its embryonic sources.

Testgen questions still do not copy to other applications.

What structural adaptation in chickens allows them to lay their eggs in arid environments rather than in water?

The archenteron develops into

Although it contributes no cells to the embryo,the formation of the primitive streak is guided by the structure known as the

With regard to the establishment of an anterior-posterior axis,which of the following pairs is incorrect?

Which of the following is common to the development of both birds and mammals?

The vertebrate ectoderm is the origin of the

The arrangement of organs and tissues in their characteristic places in 3-D space defines

Which membranes fuse first during fertilization?

A primitive streak forms during the early embryonic development of

Cells transplanted from the neural tube of a frog embryo to the ventral part of another embryo develop into nervous system tissues.This result indicates that the transplanted cells were

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

The Cell Cycle

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

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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