The point of initiation of gastrulation in the frog embryos is determined by: a.
ID: 47789 • Letter: T
Question
The point of initiation of gastrulation in the frog embryos is determined by:
a. the point of sperm penetration
b. the rotation of the cortical sytoplasm at fertilization
c. the development of the gray crescent area
d. the expression of inducers by the Nieuwkoop center
e. all of the above
In Amphibian eggs, the type of cleavage pattern is usually seen is
a. meroblastic
b. telotelicithal
c. holoblastic
d. discoidal
e. isolecithal
In the determination of right and left sidedness in the embryo, expression of bone morphogenic proteins will
a. block the expression of nodal and lefty-2
b. cause the expression of SNAIL
c. cause the expression of PITX-2
d. facilitate the expression of sonic hedgehod (shh)
e. A and B only
The umbilical vein carries
a. waste-laden blood away from embryo
b. nutrient laden blood from the yolk
c. waste laden blood to alantoic sac
d. nutrient laden blood to embryonic heart
e. none of the above
Which of the following processes is not a function of the placenta?
a. nutrition
b. hormonal
c. immunological
d. respiratory
e. all of the above are functions of theplacenta
The umbilical artery carries
a. oxygenated, nutrient laden blood
b. deoxygenated waste laden blood
c. waste laden blood to allantoic sac
d. deoxygenated blood to chorion
e. none of the above
Explanation / Answer
The point of initiation of gastrulation in the frog embryos is determined by:
a. the point of sperm penetration - True
b. the rotation of the cortical sytoplasm at fertilization - True
c. the development of the gray crescent area - True
d. the expression of inducers by the Nieuwkoop center - True
Thus, the correct option is, e. All of the above.
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