What Has Been Discovered in Some Meteorites That Suggests That

question 145

Multiple Choice

What has been discovered in some meteorites that suggests that the formation of the Sun and solar system might have been triggered by a supernova explosion?

• A) decay products of short-lived radioactive elements, which only could have been produced in intense nuclear reactions
• B) super-pure iron, produced only in nuclear reactions
• C) fusion crusts around most meteorites, indicating that they were heated intensely at some time in their history
• D) amino acids, which can be produced only in very specific conditions

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Definitions:

Light-Dependent Reactions

The phase of photosynthesis where light energy is captured by chlorophyll and converted into chemical energy stored in ATP and NADPH, essential for the subsequent synthesis of glucose in the light-independent reactions.

Photosystem I

A complex found in the chloroplasts of plants, algae, and cyanobacteria that is involved in the light-dependent reactions of photosynthesis, capturing light energy to produce ATP and NADPH.

NADPH

Nicotinamide adenine dinucleotide phosphate, a coenzyme that plays a critical role in photosynthesis and fatty acid synthesis by carrying electrons.

Noncyclic Pathways

Metabolic pathways that do not recycle their starting molecule, leading to the production of end products.