Question 1

During gastrulation,three tissue layers form: the outer __________,the inner __________,and the __________ in between the first two layers.

Accepted Answer

ectoderm;

Question 2

Mutation in master regulators,such as those governing the formation of body segments called _____________ that later develop into bones and skeletal muscles,are usually lethal to the embryo.

Accepted Answer

A)  blastocysts 
B)  somites 
C)  embryonic disks 
D)  amnion 
E)  pharyngeal arches 
A)  blastocysts 
B)  somites 
C)  embryonic disks 
D)  amnion 
E)  pharyngeal arches

Question 3

Choose the one best answer for each numbered item.
-Differentiation

Accepted Answer

A) Visible marker of the site where an amphibian's body axis will be established and where gastrulation will begin 
B) The formation of three embryonic tissue layers 
C) The fusion of male and female nuclei 
D) The entire body divides transversely; each half grows and regenerates the missing part 
E) Selective gene expression results in different cell types
F)Subdividing of the zygote by mitosis; no growth occurs
G)Region of zygote that has less yolk and is pigmented
H)An embryonic stage of development that has three primary tissue layers before organogenesis begins
I)The formation of organs
J)One body part develops in response to signals from an adjacent part
K)The growth, shaping, and spatial coordination of tissues and organs so that a predefined pattern of the whole organism results
L)Programmed cell death, as occurs in the formation of the mouse paw 
A) Visible marker of the site where an amphibian's body axis will be established and where gastrulation will begin 
B) The formation of three embryonic tissue layers 
C) The fusion of male and female nuclei 
D) The entire body divides transversely; each half grows and regenerates the missing part 
E) Selective gene expression results in different cell types
F)Subdividing of the zygote by mitosis; no growth occurs
G)Region of zygote that has less yolk and is pigmented
H)An embryonic stage of development that has three primary tissue layers before organogenesis begins
I)The formation of organs
J)One body part develops in response to signals from an adjacent part
K)The growth, shaping, and spatial coordination of tissues and organs so that a predefined pattern of the whole organism results
L)Programmed cell death, as occurs in the formation of the mouse paw

Question 4

Respond to the following statements with reference to the five terms below.
-This is the first primary tissue layer to form.

Accepted Answer

A) Somites 
B) Blastocyst 
C) Ectoderm 
D) Mesoderm 
E) Endoderm 
A) Somites 
B) Blastocyst 
C) Ectoderm 
D) Mesoderm 
E) Endoderm

Question 5

Choose the one best answer for each numbered item.
-Embryonic induction

Accepted Answer

A) Visible marker of the site where an amphibian's body axis will be established and where gastrulation will begin 
B) The formation of three embryonic tissue layers 
C) The fusion of male and female nuclei 
D) The entire body divides transversely; each half grows and regenerates the missing part 
E) Selective gene expression results in different cell types
F)Subdividing of the zygote by mitosis; no growth occurs
G)Region of zygote that has less yolk and is pigmented
H)An embryonic stage of development that has three primary tissue layers before organogenesis begins
I)The formation of organs
J)One body part develops in response to signals from an adjacent part
K)The growth, shaping, and spatial coordination of tissues and organs so that a predefined pattern of the whole organism results
L)Programmed cell death, as occurs in the formation of the mouse paw 
A) Visible marker of the site where an amphibian's body axis will be established and where gastrulation will begin 
B) The formation of three embryonic tissue layers 
C) The fusion of male and female nuclei 
D) The entire body divides transversely; each half grows and regenerates the missing part 
E) Selective gene expression results in different cell types
F)Subdividing of the zygote by mitosis; no growth occurs
G)Region of zygote that has less yolk and is pigmented
H)An embryonic stage of development that has three primary tissue layers before organogenesis begins
I)The formation of organs
J)One body part develops in response to signals from an adjacent part
K)The growth, shaping, and spatial coordination of tissues and organs so that a predefined pattern of the whole organism results
L)Programmed cell death, as occurs in the formation of the mouse paw

Question 6

Figure 42.11
Use the figure above showing human embryonic developmental day 14 to answer the following question.
-The structure that later becomes part of the placenta is indicated by ____.

Accepted Answer

A)  A 
B)  B 
C)  C 
D)  D 
E)  E 
A)  A 
B)  B 
C)  C 
D)  D 
E)  E

Question 7

Respond to the following statements with reference to the five terms below.
-Blocks of cells in the mesoderm that develop into bones and the skeletal muscle

Accepted Answer

A) Somites 
B) Blastocyst 
C) Ectoderm 
D) Mesoderm 
E) Endoderm 
A) Somites 
B) Blastocyst 
C) Ectoderm 
D) Mesoderm 
E) Endoderm

Question 8

In the placenta,nutrients move from mother to baby by ____.

Accepted Answer

A)  activated transport 
B)  the Rh factor 
C)  transport proteins 
D)  simple diffusion 
E)  HCG 
A)  activated transport 
B)  the Rh factor 
C)  transport proteins 
D)  simple diffusion 
E)  HCG

Question 9

Most neurons have formed by the ____,allowing reflexive movements.

Accepted Answer

A)  first trimester 
B)  fourth month 
C)  third trimester 
D)  ninth month 
E)  seventh month 
A)  first trimester 
B)  fourth month 
C)  third trimester 
D)  ninth month 
E)  seventh month

Question 10

Without _____,humans might have a tail.

Accepted Answer

A)  differentiation 
B)  epigenetics 
C)  cell migrations 
D)  apoptosis 
E)  the maternal gene effect 
A)  differentiation 
B)  epigenetics 
C)  cell migrations 
D)  apoptosis 
E)  the maternal gene effect

Question 11

Respond to the following statements with reference to the five terms below.
-It forms between the other two primary tissue layers.

Accepted Answer

A) Somites 
B) Blastocyst 
C) Ectoderm 
D) Mesoderm 
E) Endoderm 
A) Somites 
B) Blastocyst 
C) Ectoderm 
D) Mesoderm 
E) Endoderm

Question 12

During days 8 and 9 after fertilization in humans,____.

Accepted Answer

A)  amnion cleavage begins 
B)  a blastocyst forms 
C)  an embryonic disk is formed 
D)  implantation occurs 
E)  gastrulation occurs 
A)  amnion cleavage begins 
B)  a blastocyst forms 
C)  an embryonic disk is formed 
D)  implantation occurs 
E)  gastrulation occurs

Exam 42: Animal Development

During gastrulation,three tissue layers form: the outer __________,the inner __________,and the __________ in between the first two layers.

Mutation in master regulators,such as those governing the formation of body segments called _____________ that later develop into bones and skeletal muscles,are usually lethal to the embryo.

Choose the one best answer for each numbered item. -Differentiation

Respond to the following statements with reference to the five terms below. -This is the first primary tissue layer to form.

Choose the one best answer for each numbered item. -Embryonic induction

Figure 42.11 Use the figure above showing human embryonic developmental day 14 to answer the following question. -The structure that later becomes part of the placenta is indicated by ____.

Respond to the following statements with reference to the five terms below. -Blocks of cells in the mesoderm that develop into bones and the skeletal muscle

In the placenta,nutrients move from mother to baby by ____.

Most neurons have formed by the ____,allowing reflexive movements.

Without _____,humans might have a tail.

Respond to the following statements with reference to the five terms below. -It forms between the other two primary tissue layers.

During days 8 and 9 after fertilization in humans,____.

Invitation to Biology

Life's Chemical Bases

Molecules of Life

Cell Structure

Ground Rules of Metabolism

Where it Starts—Photosynthesis

How Cells Release Chemical Energy

DNA Structure and Function

From DNA to Protein

Control of Gene Expression

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Studying and Manipulating Genomes

Evidence of Evolution

Processes of Evolution

Organizing Information about Species

Life's Origin and Early Evolution

Viruses, Bacteria, and Archaea

Protists: The Simplest Eukaryotes

The Land Plants

Fungi

Animal Evolution: The Invertebrates

Animal Evolution: The Chordates

Human Evolution

Plant Tissues

Plant Nutrition and Transport

Life Cycles of Flowering Plants

Communication Strategies in Plants

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Structural Support and Movement

Circulation

Immunity

Respiration

Digestion and Nutrition

Maintaining the Internal Environment

Animal Reproductive System

Animal Behavior

Population Ecology

Community Ecology

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters

During gastrulation,three tissue layers form: the outer ,the inner ,and the __ in between the first two layers.