In the blastocyst, the trophoblast will become whereas the embryoblast (inner cell mass) will become .

Select one:

the embryo; part of the placenta

part of the placenta; the embryo

part of the placenta; the yolk sac

the embryo; the yolk sac

Answer and Explanation

The Correct Answer is B

A. the embryo; part of the placenta. The embryoblast (inner cell mass) will become the embryo, but the trophoblast will become part of the placenta, not the embryo.

B. part of the placenta; the embryo. The trophoblast forms part of the placenta and helps in its development, while the embryoblast (inner cell mass) will develop into the embryo.

C. part of the placenta; the yolk sac. While the trophoblast does contribute to the formation of the placenta, the embryoblast (inner cell mass) develops into the embryo, not the yolk sac. The yolk sac is derived from extraembryonic mesoderm and endoderm, not the inner cell mass directly.

D. the embryo; the yolk sac. The embryoblast (inner cell mass) develops into the embryo, but the trophoblast does not become the yolk sac. The yolk sac is formed from structures surrounding the embryo, not from the trophoblast itself.

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Correct Answer is C

Explanation

A. Lactose; lactase: Lactase is the enzyme that breaks down lactose, not the other way around.

B. Lipases; micelles: Lipases break down lipids (fats) into fatty acids and glycerol, not micelles. Micelles are formed as part of the digestion process but are not the substrate for lipases.

C. Peptidases; proteins: Peptidases (or proteases) break down proteins into smaller peptides and amino acids. This is the correct answer.

D. Lactase; glucose: Lactase breaks down lactose into glucose and galactose, not just glucose.

A. Y chromosome B. gonadal ridges C. X chromosome D. fetal testes

Correct Answer is A

Explanation

A. Y chromosome: The SRY gene on the Y chromosome codes for the testis-determining factor (TDF), which initiates the development of testes and male characteristics.

B. Gonadal ridges: The gonadal ridges are the precursor structures that develop into gonads but do not contain the gene for TDF.

C. X chromosome: The X chromosome contains genes important for development but does not code for TDF.

D. Fetal testes: The fetal testes produce testosterone but are not the source of the TDF gene.

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In the blastocyst, the trophoblast will become__________ whereas the embryoblast (inner cell mass) will become __________.

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Naxlex Comprehensive Predictor Exams

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Correct Answer is C

Explanation

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Explanation

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In the blastocyst, the trophoblast will become whereas the embryoblast (inner cell mass) will become .