Question 1

After induction occurs, the

Accepted Answer

A)  transcription of all genes stops. 
B)  cells have different genes. 
C)  fate of each cell is permanently fixed. 
D)  DNA of the mitochondria differentiates into new genes. 
A)  transcription of all genes stops. 
B)  cells have different genes. 
C)  fate of each cell is permanently fixed. 
D)  DNA of the mitochondria differentiates into new genes. C

Question 2

The developing fetus secretes chorionic gonadotropin only during the first 2 weeks of pregnancy.

Accepted Answer

A) True 
 B)False  False

Question 3

Based on experiments with amphibian embryos, Spemann and Mangold found that

Accepted Answer

A)  transplanted cells always died. 
B)  transplanted cells always formed a whole new embryo. 
C)  in most cases, transplanted donor cells assumed the developmental fate of the area to which they were transplanted in the host. 
D)  transplanted cells completely undifferentiated into random masses of tissue. 
E)  donor cells maintained their original differentiation no matter where in the host they were transplanted. 
A)  transplanted cells always died. 
B)  transplanted cells always formed a whole new embryo. 
C)  in most cases, transplanted donor cells assumed the developmental fate of the area to which they were transplanted in the host. 
D)  transplanted cells completely undifferentiated into random masses of tissue. 
E)  donor cells maintained their original differentiation no matter where in the host they were transplanted. C

Question 4

At what stage does a human embryo implant in the uterus?

Accepted Answer

A)  Morula 
B)  Blastocyst 
C)  Gastrula 
D)  Fetal 
E)  Embryonic disk 
A)  Morula 
B)  Blastocyst 
C)  Gastrula 
D)  Fetal 
E)  Embryonic disk

Question 5

Recent studies have shown that cells of the dorsal lip of the blastopore contain active genes that code for proteins that are able to induce the development of other cells.

Accepted Answer

The answer of Recent studies have shown that cells of...

Question 6

The placental blood vessels

Accepted Answer

A)  manufacture hormones that slow the growth of the embryo, preventing it from outgrowing the uterus. 
B)  prevent all microbes and toxins from crossing from mother to child. 
C)  allow for the exchange of wastes and nutrients but keep the maternal and fetal circulations separate. 
D)  mix maternal blood and fetal blood. 
E)  draw oxygen from the fetal blood and pass it to the mother. 
A)  manufacture hormones that slow the growth of the embryo, preventing it from outgrowing the uterus. 
B)  prevent all microbes and toxins from crossing from mother to child. 
C)  allow for the exchange of wastes and nutrients but keep the maternal and fetal circulations separate. 
D)  mix maternal blood and fetal blood. 
E)  draw oxygen from the fetal blood and pass it to the mother.

Question 7

The embryo of a undergoes direct development.

Accepted Answer

A)  snake 
B)  lobster 
C)  frog 
D)  dragonfly 
E)  butterfly 
A)  snake 
B)  lobster 
C)  frog 
D)  dragonfly 
E)  butterfly

Question 8

A recent series of TV commercials promoted the idea that a woman who wants to have a healthy baby must begin to eat well and avoid some medications and alcohol before she knows she is pregnant. Why?

Accepted Answer

Gastrulation and differentiation of embr

Question 9

An embryo was exposed to a chemical early in its development. At birth, there is chromosomal damage to the skin linked to the chemical exposure. What other organ system should be examined for the same type of damage?

Accepted Answer

The nervous system,

Question 10

A morula is a solid ball of undifferentiated cells.

Accepted Answer

A) True 
 B)False

Question 11

As a morula, the embryo consists of

Accepted Answer

A)  a cluster of cells that are much larger than normal cells. 
B)  cells that have different DNA content. 
C)  three differentiated layers of cells. 
D)  a hollow ball of cells. 
E)  a solid mass of cells, each the size of the zygote. 
A)  a cluster of cells that are much larger than normal cells. 
B)  cells that have different DNA content. 
C)  three differentiated layers of cells. 
D)  a hollow ball of cells. 
E)  a solid mass of cells, each the size of the zygote.

Question 12

A human embryologist examines a 3- week- old embryo and notices that it has not developed a notochord. If the embryo survives, it will lack

Accepted Answer

A)  a stomach and a pancreas. 
B)  skin and blood vessels. 
C)  a brain and a spinal cord. 
D)  a heart and lungs. 
A)  a stomach and a pancreas. 
B)  skin and blood vessels. 
C)  a brain and a spinal cord. 
D)  a heart and lungs.

Question 13

is the medication given to combat morning sickness that caused deformed and missing limbs in infants in the late 1950s and early 1960s.

Accepted Answer

A)  Alcohol 
B)  Nicotine 
C)  Thalidomide 
D)  Rubella 
E)  Accutane® 
A)  Alcohol 
B)  Nicotine 
C)  Thalidomide 
D)  Rubella 
E)  Accutane®

Question 14

In what ways are the juveniles of direct- development species like their parents, and in what way are they different?

Accepted Answer

The juveniles look like their

Question 15

-A mad scientist decides to start combining embryos and see what develops. He takes cells from the blastula of a frog with blue skin and transplants them into the blastula of a yellow- skinned frog. The embryo receiving the cells develops blue cells in its brain and spinal cord. The scientist must have transplanted the cells into the of the recipient embryo.

Accepted Answer

A)  endoderm 
B)  mesoderm 
C)  ectoderm 
D)  yolk sac 
E)  allantois 
A)  endoderm 
B)  mesoderm 
C)  ectoderm 
D)  yolk sac 
E)  allantois

Question 16

What is a gastrula?

Accepted Answer

An embryo

Question 17

The umbilical cord of a mammal connects the

Accepted Answer

A)  amnion and the chorion. 
B)  fetus and the placenta. 
C)  embryo and the amnion. 
D)  yolk sac and the allantois. 
E)  maternal and fetal bloodstreams. 
A)  amnion and the chorion. 
B)  fetus and the placenta. 
C)  embryo and the amnion. 
D)  yolk sac and the allantois. 
E)  maternal and fetal bloodstreams.

Question 18

What will occur if a morula divides into three masses of cells?

Accepted Answer

A)  The resulting embryos will develop severe birth defects due to missing genes. 
B)  Normal identical triplets will be born. 
C)  Three distinctly different embryos will develop, depending on which homeoboxes went with which mass of cells. 
D)  The resulting embryos will die. 
E)  The resulting embryos will develop, but they may be missing some organs based on which germ layers were transferred with each section. 
A)  The resulting embryos will develop severe birth defects due to missing genes. 
B)  Normal identical triplets will be born. 
C)  Three distinctly different embryos will develop, depending on which homeoboxes went with which mass of cells. 
D)  The resulting embryos will die. 
E)  The resulting embryos will develop, but they may be missing some organs based on which germ layers were transferred with each section.

Question 19

Why do organisms that have indirect development produce hundreds of offspring, whereas those with direct development produce relatively few offspring?

Accepted Answer

Organisms that have direct development p

Question 20

How does direct development of an embryo differ from indirect development?

Accepted Answer

In direct development, the embryo develo

Exam 43: Animal Development

After induction occurs, the

The developing fetus secretes chorionic gonadotropin only during the first 2 weeks of pregnancy.

Based on experiments with amphibian embryos, Spemann and Mangold found that

At what stage does a human embryo implant in the uterus?

Recent studies have shown that cells of the dorsal lip of the blastopore contain active genes that code for proteins that are able to induce the development of other cells.

The placental blood vessels

The embryo of a undergoes direct development.

A recent series of TV commercials promoted the idea that a woman who wants to have a healthy baby must begin to eat well and avoid some medications and alcohol before she knows she is pregnant. Why?

An embryo was exposed to a chemical early in its development. At birth, there is chromosomal damage to the skin linked to the chemical exposure. What other organ system should be examined for the same type of damage?

A morula is a solid ball of undifferentiated cells.

As a morula, the embryo consists of

A human embryologist examines a 3- week- old embryo and notices that it has not developed a notochord. If the embryo survives, it will lack

is the medication given to combat morning sickness that caused deformed and missing limbs in infants in the late 1950s and early 1960s.

In what ways are the juveniles of direct- development species like their parents, and in what way are they different?

What is a gastrula?

The umbilical cord of a mammal connects the

What will occur if a morula divides into three masses of cells?

Why do organisms that have indirect development produce hundreds of offspring, whereas those with direct development produce relatively few offspring?

How does direct development of an embryo differ from indirect development?

An Introduction to Life on Earth

Atoms, Molecules, and Life

Biological Molecules

Cell Structure and Function

Cell Membrane Structure and Function

Energy Flow in the Life of a Cell

Capturing Solar Energy: Photosynthesis

Harvesting Energy: Glycolysis and Cellular Respiration

Cellular Reproduction

Meiosis: the Basis of Sexual Reproduction

Patterns of Inheritance

Dna: the Molecule of Heredity

Gene Expression and Regulation

Biotechnology

Principles of Evolution

How Populations Evolve

The Origin of Species

The History of Life

Systematics: Seeking Order Amid Diversity

The Diversity of Prokaryotes and Viruses

The Diversity of Protists

The Diversity of Plants

The Diversity of Fungi

Animal Diversity I: Invertebrates

Animal Diversity II: Vertebrates

Animal Behavior

Population Growth and Regulation

Community Interactions

Energy Flow and Nutrient Cycling in Ecosystems

Earths Diverse Ecosystems

Conserving Earths Biodiversity

Homeostasis and the Organization of the Animal Body

Circulation

Respiration

Nutrition and Digestion

The Urinary System

Defenses Against Disease

Chemical Control of the Animal Body: the Endocrine System

The Nervous System

The Senses

Action and Support: the Muscles and Skeleton

Animal Reproduction

Plant Anatomy and Nutrient Transport

Plant Reproduction and Development

Plant Responses to the Environment

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