What Phenomenon of the Ocean Crust Led Scientists to Propose

question 56

Multiple Choice

What phenomenon of the ocean crust led scientists to propose the idea of sea-floor spreading?

• A) volcanoes in Japan
• B) symmetrically magnetized stripes of rock on the ocean floor
• C) earthquakes in the middle of the ocean
• D) mountain chains around the Pacific Ocean
• E) the San Andreas fault

Describe the role of catalysts in polymer synthesis and their impact on polymer properties.

Distinguish between addition and condensation polymers.

Identify polymers based on monomer types and synthesis reactions.

Understand the structural implications of polymer stereochemistry.

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Definitions:

Antagonist

A molecule that binds to a receptor but does not activate it, thereby blocking action of agonist molecules or inhibiting the function of an enzyme.

Curare

A plant extract used by South American indigenous peoples on arrows and darts for hunting, which acts as a muscle relaxant by blocking neurotransmission.

Physostigmine

Physostigmine is a reversible cholinesterase inhibitor used medically to increase acetylcholine levels in the treatment of certain disorders, such as glaucoma and myasthenia gravis.

Poison Arrowheads

Historical weapons used for hunting and warfare, often coated with natural toxins to incapacitate or kill the target.