exam 4 Flashcards

(53 cards)

1
Q

Amphibian b-catenin activity becomes stabilized at a site opposite that of sperm entry..

A
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2
Q

Formation of the amphibian Organizer involves high level expression of

A

high nodal: high Xnr on dorsal ( high translation of Vgt1 and VegT)

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3
Q

Which of the following are present in the Organizer?

A

Chordin, Noggin, Follistan, Xnr3

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4
Q

The left side of the Xenopus embryo is determined by

A
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5
Q

Which of the following can inhibit or block Wnt expression?

A

Cerberus, Dickkopf, Frzb, IGF, Tiki, Notum, Xwnt8

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6
Q

During Mid Blastula transition in Xenopus

A
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7
Q

The area where gray crescent forms will determine…

A
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8
Q

The Nieuwkoop Center is

A
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9
Q

Beta-catenin in the dorsal portion of the amphibian egg is stabilized after

A
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10
Q

Which of the following describes organizer Functions in Xenopus

A
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11
Q

Sox2 is expressed in the neural plates. Which of the following phenotypes would you expect to
observe after BMP inactivation in Xenopus embryos

A
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12
Q

Which of the following molecules plays a role in controlling Wnt signaling?

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13
Q

Under the influence of high levels of BMP ectoderm

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14
Q

Low levels of BMP can induce

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15
Q

Which of the following can inhibit BMP?

A
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16
Q

During the formation of the head and brain in Xenopus

A
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17
Q

The “Organizer” functions to

A
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18
Q

In the diagram at right which adhesion protein is expressed in the area labeled

A
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19
Q

During dorsal-ventral specification of the neural tube of vertebrates the protein that regulates
the formation and position of the floor plate is

A
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20
Q

Which of the following belongs to the TGF-b gene family?

A
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21
Q

Which region of the neural tube contains the least amount of sonic hedgehog?

A
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22
Q

Frog egg microtubule are reorganized to form the Gray Crescent during the

23
Q

The amphibian Organizer is in the

24
Q

The Pitx2 molecule

25
The experiment of Hemmati Brivanlou in which he tested the role of Follistatin on Activin lead to the discovery that
26
The vegetal pole in Xenopus is a source of
27
Which of the following molecules have a conserved role in defining anterior posterior axis?
27
Which of the following phenotypes would you expect to observe inducing Noggin expression in a ventralized embryo
28
Which of the following sentences about Xenopus Nodal Related (Xnr-1) are correct
29
Ventral tube formation can be experimentally induced
30
Which of the following factors can affect neural tube closure
31
Genetic abnormality involving motile cilia
32
During the process of garstrulation Hox genes are
32
What molecule density does the diagram on the right illustrate? Choose it from the list
33
Which of the following sentences is correct
33
Ectopic expression of Pitx2 in the developing Xenopus can
34
Spina bifida
35
During the process of dorsal ventral specification of the neural tube
36
Ectopic notochord can induce
37
Homeotic selector genes ...
37
The pattern of expression of the genes that define the distinct populations of the neural tube are defined by
38
Epiboly of the ectoderm in Xenopus is a process
39
The Niewkoop center
40
Transplant of the dorsal blastopore lip (early gastrula) to another gastrula ....
41
Dorsal ventral axis in drosophila....
41
Frzb
42
BMP gradients define dorsal-ventral axis of developing Xenopus embryo
43
Transplants of blastomers from the dorsal portion of the vegetal pole to the ventral vegetal pole of another embryo leads to
44
Noggin plays an important role in defining the
45
During the definition of the anterior posterior axis in amphibians what defines the head
45
Second neurulation
46
Folic acid is important
47
What is the doral lip and what produces the gastrulation
Organizer