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A Team of Biologists Collects Samples from a Stream

question 7

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A team of biologists collects samples from a stream.Using PCR and other techniques, they amplify numerous DNA sequences.In doing so, they discover many new bacterial species.These biologists are working in the field of


Definitions:

Amnion

The innermost membrane enveloping the embryo and containing amniotic fluid.

Yolk Sac

An early development structure in embryos, providing nutrition before the circulatory system and placenta are fully developed.

Umbilical Cord

The flexible tube connecting a fetus to the placenta, delivering nutrients and removing waste.

Blastocyst

An early stage in human embryonic development, a structure formed approximately 5 days after fertilization, consisting of an inner cell mass, a fluid-filled cavity, and an outer layer of cells.

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