Question 1

The gray crescent

Accepted Answer

A)  is observable in the frog zygote. 
B)  develops at the site of sperm entry. 
C)  causes rotation of the cortical cytoplasm. 
D)  induces formation of the optic cup. 
E)  is induced by Sonic hedgehog proteins. 
A)  is observable in the frog zygote. 
B)  develops at the site of sperm entry. 
C)  causes rotation of the cortical cytoplasm. 
D)  induces formation of the optic cup. 
E)  is induced by Sonic hedgehog proteins.

Question 2

During cleavage,the cytoplasm of new cells in a developing frog embryo

Accepted Answer

A)  comes from the egg cytoplasm. 
B)  is synthesized by the blastomeres. 
C)  does not contain yolk. 
D)  comes from the vegetal pole. 
E)  undergoes mitosis. 
A)  comes from the egg cytoplasm. 
B)  is synthesized by the blastomeres. 
C)  does not contain yolk. 
D)  comes from the vegetal pole. 
E)  undergoes mitosis.

Question 3

The storage of _______ is a function of the allantois in the chick embryo.

Accepted Answer

nitrogenou

Question 4

The period of human gestation

Accepted Answer

A)  lasts about 360 days. 
B)  is the time between implantation and organogenesis. 
C)  can be divided into three trimesters of roughly three months each. 
D)  is the time between a woman's last period and the occurrence of implantation. 
E)  ends several days before birth. 
A)  lasts about 360 days. 
B)  is the time between implantation and organogenesis. 
C)  can be divided into three trimesters of roughly three months each. 
D)  is the time between a woman's last period and the occurrence of implantation. 
E)  ends several days before birth.

Question 5

The amniote egg

Accepted Answer

A)  first appeared in fish. 
B)  allowed amphibians to lay moderately yolky eggs. 
C)  freed the first reptiles from needing to return to a body of water for reproduction. 
D)  is found in all vertebrates. 
E)  is a feature characteristic of chordates. 
A)  first appeared in fish. 
B)  allowed amphibians to lay moderately yolky eggs. 
C)  freed the first reptiles from needing to return to a body of water for reproduction. 
D)  is found in all vertebrates. 
E)  is a feature characteristic of chordates.

Question 6

You can artificially activate an unfertilized frog egg to begin developing by pricking it with a needle.That the egg can be induced to undergo cleavage in the absence of sperm indicates that

Accepted Answer

A)  sperm do not contribute a microtubule organizing center to the egg. 
B)  fertilization can occur in the absence of sperm. 
C)  microtubule organizing centers are not involved in cleavage. 
D)  mitosis in the egg does not involve centrioles. 
E)  the egg can provide a centriole if it doesn't receive one from the sperm. 
A)  sperm do not contribute a microtubule organizing center to the egg. 
B)  fertilization can occur in the absence of sperm. 
C)  microtubule organizing centers are not involved in cleavage. 
D)  mitosis in the egg does not involve centrioles. 
E)  the egg can provide a centriole if it doesn't receive one from the sperm.

Question 7

The stage an embryo enters following fertilization is called the _______ stage.

Accepted Answer

A)  fetal 
B)  cleavage 
C)  gastrula 
D)  blastula 
E)  trophoblast 
A)  fetal 
B)  cleavage 
C)  gastrula 
D)  blastula 
E)  trophoblast

Question 8

A body plan consisting of repeating segments,which are modified during development into structures such as vertebrae,ribs,and muscles,depends on modification of early developmental structures called

Accepted Answer

A)  interneurons. 
B)  somites. 
C)  parenchyma. 
D)  neural crest cells. 
E)  lateral plate mesoderm. 
A)  interneurons. 
B)  somites. 
C)  parenchyma. 
D)  neural crest cells. 
E)  lateral plate mesoderm.

Question 9

If you damaged the anterior notochord in an amphibian embryo prior to neurulation,the _______ would most likely fail to form in the embryo.

Accepted Answer

The answer of If you damaged the anterior notochord in...

Question 10

One of the earliest stages of organogenesis involves the initiation of nervous system development through the process of _______.

Accepted Answer

The answer of One of the earliest stages of organogenesis...

Question 11

The structure in birds that is most analogous to the dorsal lip of the frog blastopore is

Accepted Answer

A)  the primitive streak. 
B)  the archenteron. 
C)  the yolk plug. 
D)  Hensen's node. 
E)  the notochord. 
A)  the primitive streak. 
B)  the archenteron. 
C)  the yolk plug. 
D)  Hensen's node. 
E)  the notochord.

Question 12

When zebrafish eggs are laid,they are surrounded by a tough chorion.Sperm are unable to get through this chorion and must find the tiny tunnel called a micropyle that provides a channel to the egg cell membrane.This channel is so tiny that only one sperm is able to fit through at a time.The micropyle most likely

Accepted Answer

A)  aids in preventing polyspermy. 
B)  prevents sperm from other species from fusing with the egg. 
C)  evolved from a similar structure found in fruit fly eggs. 
D)  ensures that the head and not the tail of the sperm fuses with the egg. 
E)  is a mechanism to ensure that the zygote is diploid and not haploid. 
A)  aids in preventing polyspermy. 
B)  prevents sperm from other species from fusing with the egg. 
C)  evolved from a similar structure found in fruit fly eggs. 
D)  ensures that the head and not the tail of the sperm fuses with the egg. 
E)  is a mechanism to ensure that the zygote is diploid and not haploid.

Question 13

The major divisions of the brain develop from the

Accepted Answer

A)  anterior end of the neural tube. 
B)  posterior end of the neural tube. 
C)  anterior portion of the notochord. 
D)  posterior portion of the notochord. 
E)  anterior somites. 
A)  anterior end of the neural tube. 
B)  posterior end of the neural tube. 
C)  anterior portion of the notochord. 
D)  posterior portion of the notochord. 
E)  anterior somites.

Question 14

What organism would produce the type of embryo shown in the figure?

Accepted Answer

A)  Salamander 
B)  Fish 
C)  Human 
D)  Fruit fly 
E)  Sea urchin 
A)  Salamander 
B)  Fish 
C)  Human 
D)  Fruit fly 
E)  Sea urchin

Question 15

Invagination in the sea urchin blastula

Accepted Answer

A)  forms the neural tube. 
B)  involves contractile filopodia extending from the endoderm cells. 
C)  creates a blastopore that becomes the mouth. 
D)  forms the archenteron. 
E)  occurs just prior to the blastula stage. 
A)  forms the neural tube. 
B)  involves contractile filopodia extending from the endoderm cells. 
C)  creates a blastopore that becomes the mouth. 
D)  forms the archenteron. 
E)  occurs just prior to the blastula stage.

Question 16

Following gastrulation in vertebrates,the ectodermal cells contribute predominantly to the developing

Accepted Answer

A)  nervous system and epidermis. 
B)  skeletal system and muscles. 
C)  inner lining of the gut and respiratory tract. 
D)  liver and pancreas. 
E)  None of the above 
A)  nervous system and epidermis. 
B)  skeletal system and muscles. 
C)  inner lining of the gut and respiratory tract. 
D)  liver and pancreas. 
E)  None of the above

Question 17

The tissue that induces formation of the neural tube in the developing vertebrate embryo is called the _______.

Accepted Answer

The answer of The tissue that induces formation of the...

Question 18

A fish embryo forms a yolk sac that

Accepted Answer

A)  is made of the same germ layers as the yolk sac in a chick embryo. 
B)  is vascularized,similar to the yolk sac of a chick embryo. 
C)  is constructed of ectoderm and mesoderm. 
D)  is similar in origin to the yolk sac in mammals. 
E)  surrounds the body of the embryo. 
A)  is made of the same germ layers as the yolk sac in a chick embryo. 
B)  is vascularized,similar to the yolk sac of a chick embryo. 
C)  is constructed of ectoderm and mesoderm. 
D)  is similar in origin to the yolk sac in mammals. 
E)  surrounds the body of the embryo.

Question 19

In vertebrate embryos,the kidneys develop from _______;the peritoneum surrounding the body coelom develops from the ________.

Accepted Answer

intermedia

Question 20

Which cells develop into the body of a human embryo?

Accepted Answer

A)  Trophoblast 
B)  Extraembryonic membrane 
C)  Inner cell mass 
D)  Cumulus 
E)  Follicle 
A)  Trophoblast 
B)  Extraembryonic membrane 
C)  Inner cell mass 
D)  Cumulus 
E)  Follicle

Exam 38: Animal Development

The gray crescent

During cleavage,the cytoplasm of new cells in a developing frog embryo

The storage of _______ is a function of the allantois in the chick embryo.

The period of human gestation

The amniote egg

You can artificially activate an unfertilized frog egg to begin developing by pricking it with a needle.That the egg can be induced to undergo cleavage in the absence of sperm indicates that

The stage an embryo enters following fertilization is called the _______ stage.

A body plan consisting of repeating segments,which are modified during development into structures such as vertebrae,ribs,and muscles,depends on modification of early developmental structures called

If you damaged the anterior notochord in an amphibian embryo prior to neurulation,the _______ would most likely fail to form in the embryo.

One of the earliest stages of organogenesis involves the initiation of nervous system development through the process of _______.

The structure in birds that is most analogous to the dorsal lip of the frog blastopore is

The major divisions of the brain develop from the

What organism would produce the type of embryo shown in the figure?

Invagination in the sea urchin blastula

Following gastrulation in vertebrates,the ectodermal cells contribute predominantly to the developing

The tissue that induces formation of the neural tube in the developing vertebrate embryo is called the _______.

A fish embryo forms a yolk sac that

In vertebrate embryos,the kidneys develop from _______;the peritoneum surrounding the body coelom develops from the ________.

Which cells develop into the body of a human embryo?

Introduction

The Chemistry and Energy of Life

Nucleic Acids, Proteins, and Enzymes

Cells: the Working Units of Life

Cell Membranes and Signaling

Pathways That Harvest and Store Chemical Energy

The Cell Cycle and Cell Division

Inheritance, Genes, and Chromosomes

DNA and Its Role in Heredity

From Dna to Protein: Gene Expression

Regulation of Gene Expression

Genomes

Biotechnology

Genes, Development, and Evolution

Processes of Evolution

Reconstructing and Using Phylogenies

Speciation

The History of Life on Earth

Bacteria, Archaea, and Viruses

The Origin and Diversification of Eukaryotes

The Evolution of Plants

The Evolution and Diversity of Fungi

Animal Origins and Diversity

The Plant Body

Plant Nutrition and Transport

Plant Growth and Development

Reproduction of Flowering Plants

Plants in the Environment

Fundamentals of Animal Function

Nutrition and Digestion

Breathing

Circulation

Muscle and Movement

Neurons, Sense Organs, and Nervous Systems

Nervous and Endocrine Control

Water and Salts: Excretion

Animal Reproduction

Immunology: Animal Defense Systems

Animal Behavior

The Distribution of Earths Ecological Systems

Populations

Ecological and Evolutionary Consequences of Interactions Within and Among Species

Ecological Communities

The Global Ecosystem

Filters

In vertebrate embryos,the kidneys develop from _;the peritoneum surrounding the body coelom develops from the __.