AP Biology : Understanding Embryogenesis and Development

Study concepts, example questions & explanations for AP Biology

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Example Questions

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Example Question #41 : Understanding Embryogenesis And Development

Which of the following is true of human yolk, or ooplasm?

Possible Answers:

There is only a small amount in each oocyte

Ooplasm lacks fat

Ooplasm is located at the cell cortex

The ooplasm sustains oocyte growth through the entire process of embryogenesis

Correct answer:

There is only a small amount in each oocyte

Explanation:

In a human egg cell the yolk—ooplasm—located at the cell center in an area containing the nucleus and nucleolus. The ooplasm is composed of fatty granules that support embryo development through the early stages of embryogenesis. In human oocytes, there is a relatively small amount of ooplasm compared to the embryos of other species.

Example Question #42 : Understanding Embryogenesis And Development

At the end of cleavage, where is the developing embryo located in the female reproductive system?

Possible Answers:

Fallopian tube

Ovary

Uterus

Cervix

Correct answer:

Uterus

Explanation:

During fertilization and throughout the process of cleavage, the developing embryo is located in the fallopian tube. Towards the end of cleavage, around day 5, the developing embryo enters the uterus, where it will implant in the uterine wall after blastulation.

Example Question #51 : Reproductive System

Which of the following types of cell signaling structures is formed between blastmoreres during cleavage?

Possible Answers:

Clathrin-coated vesicles 

Gap junctions

Plasmodesmata

G-protein coupled receptors

Correct answer:

Gap junctions

Explanation:

During cleavage, gap junctions form between blastomeres, promoting cell-cell communication and coordinated development. 

Example Question #52 : Reproductive System

Which of the following is true about determinate cleavage?

Possible Answers:

It takes place in most protostomes

Blastomeres do not have unlimited developmental potential 

The developmental fate is set early in the developmental process

All of these

Correct answer:

All of these

Explanation:

Determinate cleavage is a process found in most protostomes, in which the developmental fate of cells is determined early on in the developmental process. In other words, blastomeres do not have the capacity to develop into any cell type.

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