In the Period of the Embryo, the Inner Mass of the Zygote

question 68

Multiple Choice

In the period of the embryo, the inner mass of the zygote differentiates into three layers known as

• A) ectoderm, mesoderm, and endoderm.
• B) placenta, amnion, and chorion.
• C) blastocyst, trophoblast, and zygote.
• D) skin, muscle, and bone.

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Definitions:

Incorrectly-Paired Nucleotides

Mismatched pairs of nucleotides that occur during DNA replication or repair, potentially leading to mutations.

Telomeres

The protective caps at the end of chromosomes that prevent the genome from deteriorating or fusing with neighboring chromosomes.

Chromosomes

Thread-like structures located within the nucleus of animal and plant cells, made of protein and a single molecule of deoxyribonucleic acid (DNA).

Okazaki Fragments

Short strands of DNA synthesized on the lagging strand during DNA replication, which are later joined to form a continuous strand.