Question 1

Transplanting a piece of anterior mesoderm to the blastocoel of a host frog embryo will induce which of the following structures?

Accepted Answer

A)  Head 
B)  Trunk 
C)  Tail 
D)  Spinal cord 
A)  Head 
B)  Trunk 
C)  Tail 
D)  Spinal cord A

Question 2

Which of the following does not send signals that directly induce and pattern the mesoderm?

Accepted Answer

A)  Vegetal blastomeres 
B)  Animal blastomeres 
C)  Dorsal mesoderm 
D)  Ventral mesoderm 
A)  Vegetal blastomeres 
B)  Animal blastomeres 
C)  Dorsal mesoderm 
D)  Ventral mesoderm B

Question 3

Which of the following is not a secreted organizer protein?

Accepted Answer

A)  Chordin 
B)  Noggin 
C)  Follistatin 
D)  BMP 
A)  Chordin 
B)  Noggin 
C)  Follistatin 
D)  BMP D

Question 4

The amphibian egg is radially symmetric along the animal-vegetal axis. What "breaks" this symmetry?

Accepted Answer

A)  Localization of maternal RNAs to the vegetal pole 
B)  Fertilization 
C)  Localization of maternal RNAs to the animal pole 
D)  Cleavage 
A)  Localization of maternal RNAs to the vegetal pole 
B)  Fertilization 
C)  Localization of maternal RNAs to the animal pole 
D)  Cleavage

Question 5

Which of the options given would not be an expected way of forcing premature onset of the mid-blastula transition?

Accepted Answer

A)  Injecting extra DNA into the egg 
B)  Injecting extra cytoplasm into the egg 
C)  Forcing two sperm to enter the egg 
D)  Removing some cytoplasm from the egg 
A)  Injecting extra DNA into the egg 
B)  Injecting extra cytoplasm into the egg 
C)  Forcing two sperm to enter the egg 
D)  Removing some cytoplasm from the egg

Question 6

Removing the ventral blastomeres from a four-cell amphibian embryo gives rise to an embryo lacking which tissue?

Accepted Answer

A)  Notochord 
B)  Neural tube 
C)  Somites 
D)  Gut 
A)  Notochord 
B)  Neural tube 
C)  Somites 
D)  Gut

Question 7

In the zebrafish embryo, what is the equivalent of the Xenopus organizer?

Accepted Answer

A)  Shield 
B)  Node 
C)  Blastopore lip 
D)  Plate 
A)  Shield 
B)  Node 
C)  Blastopore lip 
D)  Plate

Question 8

Which of the following is the only structure induced If one performs the organizer transplantation experiment with a blastopore lip from a late stage gastrula?

Accepted Answer

A)  Head 
B)  Trunk 
C)  Tail 
D)  Brain 
A)  Head 
B)  Trunk 
C)  Tail 
D)  Brain

Question 9

Which of the following is not true of the role of BMPs in mesoderm patterning?

Accepted Answer

A)  Overexpression of BMPs ventralizes the embryo 
B)  Introduction of a dominant-negative BMP receptor ventralizes the embryo. 
C)  BMP function is inhibited by organizer signals 
D)  BMPs are signaling ligands that bind to cell-surface receptors on target cells. 
A)  Overexpression of BMPs ventralizes the embryo 
B)  Introduction of a dominant-negative BMP receptor ventralizes the embryo. 
C)  BMP function is inhibited by organizer signals 
D)  BMPs are signaling ligands that bind to cell-surface receptors on target cells.

Question 10

What is the dorsal vegetal region that induces the Spemann-Mangold organizer in an amphibian embryo?

Accepted Answer

A)  Animal cap 
B)  Nieuwkoop center 
C)  Marginal zone 
D)  Vegetal center 
A)  Animal cap 
B)  Nieuwkoop center 
C)  Marginal zone 
D)  Vegetal center

Transplanting a piece of anterior mesoderm to the blastocoel of a host frog embryo will induce which of the following structures?

Which of the following does not send signals that directly induce and pattern the mesoderm?

Which of the following is not a secreted organizer protein?

The amphibian egg is radially symmetric along the animal-vegetal axis. What "breaks" this symmetry?

Which of the options given would not be an expected way of forcing premature onset of the mid-blastula transition?

Removing the ventral blastomeres from a four-cell amphibian embryo gives rise to an embryo lacking which tissue?

In the zebrafish embryo, what is the equivalent of the Xenopus organizer?

Which of the following is the only structure induced If one performs the organizer transplantation experiment with a blastopore lip from a late stage gastrula?

Which of the following is not true of the role of BMPs in mesoderm patterning?

What is the dorsal vegetal region that induces the Spemann-Mangold organizer in an amphibian embryo?

History and Basic Concepts

Drosophila Life Cycle and Development of the Body Plan

Vertebrate Life Cycles, Experimental Techniques Human Development

Laying Down and Completing the Vertebrate Body Plan: Chick and Mouse

Morphogenesis: Change in Form in the Early Embryo

Cell Differentiation Stem Cells

Germ Cells, Fertilization Sex

Organogenesis

Development of the Nervous System

Growth, Post-Embryonic Development and Regeneration

Plant Life Cycle and Development

Evolution and Development

Filters

Exam 4: Laying Down the Vertebrate Body Plan: Xenopus and Zebrafish

Transplanting a piece of anterior mesoderm to the blastocoel of a host frog embryo will induce which of the following structures?

Which of the following does not send signals that directly induce and pattern the mesoderm?

Which of the following is not a secreted organizer protein?

The amphibian egg is radially symmetric along the animal-vegetal axis. What "breaks" this symmetry?

Which of the options given would not be an expected way of forcing premature onset of the mid-blastula transition?

Removing the ventral blastomeres from a four-cell amphibian embryo gives rise to an embryo lacking which tissue?

In the zebrafish embryo, what is the equivalent of the Xenopus organizer?

Which of the following is the only structure induced If one performs the organizer transplantation experiment with a blastopore lip from a late stage gastrula?

Which of the following is not true of the role of BMPs in mesoderm patterning?

What is the dorsal vegetal region that induces the Spemann-Mangold organizer in an amphibian embryo?

History and Basic Concepts

Drosophila Life Cycle and Development of the Body Plan

Vertebrate Life Cycles, Experimental Techniques Human Development

Laying Down and Completing the Vertebrate Body Plan: Chick and Mouse

Morphogenesis: Change in Form in the Early Embryo

Cell Differentiation Stem Cells

Germ Cells, Fertilization Sex

Organogenesis

Development of the Nervous System

Growth, Post-Embryonic Development and Regeneration

Plant Life Cycle and Development

Evolution and Development

Filters