#Question id: 7267
#Unit 5. Developmental Biology
Endocrine disruptors can interfere with hormone function in many ways like, They can act as antagonists and inhibit the binding of a hormone to its receptor or block the synthesis of a hormone. which of the following example best explains the antagonistic effect of endocrine disruptors?
#Question id: 7268
#Unit 5. Developmental Biology
Match
the columns and choose the correct option.
|
Column
I |
Column
II |
|
A.
Progress zone |
i.
thickening of the ectoderm at the apex of the
developing limb bud |
|
B.
Apical ectodermal ridge |
ii.
The cells found within the most posterior region |
|
C.
Zone of polarizing activity |
iii.
The highly proliferative mesenchyme that fuels limb
bud growth |
#Question id: 7269
#Unit 5. Developmental Biology
Following statements are regarding to gastrulation in chick embryo.
A.
During gastrulation, future mesodermal and endodermal cells migrate from the
epiblast through the primitive streak into the interior of the blastoderm.
B.
An aggregation of cells, known as Hensen’s node, forms at the posterior end of
the streak.
C.
As the streak extends, cells of the epiblast move toward the primitive streak,
through it, and then outward again underneath the surface to give rise
internally to the mesoderm and endoderm, the latter displacing a lower layer of
cells called the endoblast.
D.
Cells that remain in the epiblast form the endoderm.
Which of the following statements are correct?
#Question id: 7270
#Unit 5. Developmental Biology
According to this figure which of the following option is incorrect?
#Question id: 7271
#Unit 5. Developmental Biology
In drosophila, Head formation required higher Bicoid concentrations than thorax formation, because
#Question id: 7272
#Unit 5. Developmental Biology
Few statements regarding the role of disheveled (dsh) and beta-catenin in the
development of sea urchin.
A.
beta-catenin accumulates predominantly in the macromeres and somewhat in veg2
tier cells.
B.
At the fourth cleavage disheveled and β-catenin, both of which are found in the
cytoplasm and are inherited by the micromeres.
C.
Treating sea urchin embryos with lithium chloride allows β-catenin to
accumulate in every cell and transforms presumptive ectoderm into endoderm.
D.
When β-catenin is prevented from entering the nuclei (i.e., it remains in the
cytoplasm), the vegetal cell fates are specified, and the entire embryo
develops as a ciliated ectodermal ball.
Which one of the following options represents a combination of correct statement?