Question 1

The nematode Caenorhabditis elegans

Accepted Answer

A) is composed of a single cell, in which the developmental origin of each protein has been mapped. 
B) is composed of about 1000 cells, in which the developmental origin of each cell has been mapped. 
C) has only a single chromosome, which has been fully sequenced. 
D) has about 1000 genes, each of which has been fully sequenced. 
E) uniquely, among animals, utilizes programmed cell death during normal development. 
A) is composed of a single cell, in which the developmental origin of each protein has been mapped. 
B) is composed of about 1000 cells, in which the developmental origin of each cell has been mapped. 
C) has only a single chromosome, which has been fully sequenced. 
D) has about 1000 genes, each of which has been fully sequenced. 
E) uniquely, among animals, utilizes programmed cell death during normal development.

Question 2

From earliest to latest,the overall sequence of early development proceeds in which of the following sequences?

Accepted Answer

A) gastrulation → organogenesis → cleavage 
B) ovulation → gastrulation → fertilization 
C) cleavage → gastrulation → organogenesis 
D) gastrulation → blastulation → neurulation 
E) preformation → morphogenesis → neurulation 
A) gastrulation → organogenesis → cleavage 
B) ovulation → gastrulation → fertilization 
C) cleavage → gastrulation → organogenesis 
D) gastrulation → blastulation → neurulation 
E) preformation → morphogenesis → neurulation

Question 3

In placental mammals,the yolk sac

Accepted Answer

A) transfers nutrients from the yolk to the embryo. 
B) differentiates into the placenta. 
C) becomes a fluid-filled sac that surrounds and protects the embryo. 
D) produces blood cells that then migrate into the embryo. 
E) stores waste products from the embryo until the placenta develops. 
A) transfers nutrients from the yolk to the embryo. 
B) differentiates into the placenta. 
C) becomes a fluid-filled sac that surrounds and protects the embryo. 
D) produces blood cells that then migrate into the embryo. 
E) stores waste products from the embryo until the placenta develops.

Question 4

The embryonic precursor to the human spinal cord is the

Accepted Answer

A) notochord. 
B) neural tube. 
C) mesoderm. 
D) archenteron. 
E) set of bilateral somites. 
A) notochord. 
B) neural tube. 
C) mesoderm. 
D) archenteron. 
E) set of bilateral somites.

Question 5

Animal cells that are present only for a brief developmental phase will,following completion of that phase,undergo

Accepted Answer

A) diapause. 
B) apoptosis 
C) meiosis. 
D) oxidative phosphorylation. 
E) re-differentiation. 
A) diapause. 
B) apoptosis 
C) meiosis. 
D) oxidative phosphorylation. 
E) re-differentiation.

Question 6

In an egg cell treated with EDTA,a chemical that binds calcium and magnesium ions

Accepted Answer

A) the acrosomal reaction would be blocked. 
B) the fusion of sperm and egg nuclei would be blocked. 
C) the fast block to polyspermy would not occur. 
D) the fertilization envelope would not form. 
E) the zygote would not contain maternal and paternal chromosomes. 
A) the acrosomal reaction would be blocked. 
B) the fusion of sperm and egg nuclei would be blocked. 
C) the fast block to polyspermy would not occur. 
D) the fertilization envelope would not form. 
E) the zygote would not contain maternal and paternal chromosomes.

Exam 47: Animal Development

The nematode Caenorhabditis elegans

From earliest to latest,the overall sequence of early development proceeds in which of the following sequences?

In placental mammals,the yolk sac

The embryonic precursor to the human spinal cord is the

Animal cells that are present only for a brief developmental phase will,following completion of that phase,undergo

In an egg cell treated with EDTA,a chemical that binds calcium and magnesium ions

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

Filters