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20 Cards in this Set

  • Front
  • Back

Which of the following species exhibits radial symmetry?

Jellyfish

Which of the following systems about the endosymbiont hypothesis explains the origin of eukaryotic cells?

Mitochondria and chloroplasts originated from symbiotic relationships between 2 prokaryotic cells

What structure found in both chloroplasts and mitochondria links them to prokaryotes rather than to eukaryotes?

circular DNA molecules

What happens when phospholipids are placed in an aqueous solution?

They spontaneously form bilayers

What was the significance of the 1953 Miller-Urey experiments testing Oparin-Haldane hypothesis?

The synthesis of complex biological molecules is possible in a reducing atmosphere

Which of the following is the primary assumption made by researchers when designing experiments to model how life may have arisen?

Life arose on Earth from non-living matter

Why is the protein-first hypothesis not accepted by most scientists?

There is no known mechanism of protein self-replication

Which of the following statements supports the hypothesis that life developed near hydrothermal vents in the sea floor?

Reducing conditions exist near hydrothermal vents, along with chemicals essential for life

Which of the following statements about the RNA-first hypothesis for the origin of the cellular information system is true?

Ribozymes may have functioned as both informational molecules and as catalysts in protocells

Where did the Earth's atmosphere originate?

Gases were released from the Earth itself as it cooled and the atmosphere was derived from dust particles from the original gas cloud around the planet

In animals, a body cavity is ___________.

a fluid-filled space in which internal organs are suspended

Which of the following is a characteristic of both Archaea and Eukarya?

introns

Which of the following characteristics in NOT common to all animal species?

nervous system

What conditions were necessary on the primordial Earth for life to begin?

All of the choices are correct: liquid water, gravity, source of energy, evaporation of liquid water

It is unlikely that living cells appeared spontaneously from nonliving matter because:

living systems are so complex

After organic molecules have been formed in abundance, what is the next step that must occur in the progression toward a living organism?

aggregation of the different organic compounds so all the pre-cell building blocks are in the same localized region

Which of the following is essential to the Oparin-Haldane hypothesis of the nature of Earth's early atmosphere?

the near absence of O2

Protocells:

might have been the precursors of early cells

Which of the following supports the controversial theory that life had an extraterrestrial origin?

it is possible that organic compounds arrived by meteor impact

What feature in the first truly living cells would NOT have been found in protocells?

all choices are correct: use of DNA as a genetic molecule, an info system, a cytoplasmic region containing ribosomes and associated enzymes, a mechanism of cell division