Removing some fluid from directly around a developing human fetus is performed by inserting a long needle into the belly of the female patient. What extraembryonic membrane will be punctured in this process?

A. Amnion
B. Chorionic villi
C. External epithelium of mother
D. Chorion


Answer: A

Biology & Microbiology

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In the atmosphere, ____________________depletion in certain regions of the globe contributes to increased levels of UV radiation exposure, which in turn is associated with increases in skin cancer frequency

Fill in the blank(s) with correct word

Biology & Microbiology

Which of the groups of early developmental genes in Drosophila act across segment boundaries to produce parasegments?

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Biology & Microbiology

Simberloff and Wilson carried out a famous experiment to study the recolonization by arthropods of small mangrove by islands after the islands were fumigated. One of their findings was

A. Species turnover was high following recolonization. B. Recolonization rates were identical on all of the islands regardless of distance to the mainland. C. Arthropod species richness on the islands changed little following recolonization. D. The islands never recovered to their prefumigation levels of arthropod species richness.

Biology & Microbiology

Two types of vaccines for polio have been developed, an inactivated whole (IPV ) and a live attenuated (OPV ) vaccine. Compare and contrast the advantages and disadvantages of the two polio vaccines

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Biology & Microbiology