Biology Quiz Ev4 First Cells

The first cells were most likely primitive eukaryotic-like cells.

• true

• false

The first cells were probably no more than organic compounds, such as a simplistic RNA, surrounded by a membrane.

• true

• false

The first cell membrane was it was likely a phospholipid bilayer able to separate the inside of the cell from the outside environment

• true

• false

How organic molecules such as RNA developed into cells is not known for certain. Scientists speculate that _____________ membranes grew around the organic molecules

• lipid

• sugar

• protein

• acid

The first cells had to be able which of these to be considered living organisms? (check all that apply)

• reproduce

• pass on genetic information to their offspring

• perform photosynthesis

• perform cellular respiration

• avoid predation

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What is LUCA (Last Universal Common Ancestor)?

• The early cell (or group of cells) that started the "oxygen catastrophe".

• The early cell (or group of cells) that eventually gave rise to all subsequent life on Earth.

• The early cell (or group of cells) that evolved to perform synthesis

• The early cell (or group of cells) that evolved to have DNA and the first organelles.

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Which of these are true of LUCA?

• LUCA was probably a prokaryotic cell

• LUCA occurred 3.5 billion years ago

• LUCA performed both photosynthesis and cellular respiration.

• LUCA probably died out before the oxygen catastrophe.

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The earliest cells were probably ______________

• all of these

• eukarytotes

• heterotrophs

• autotrophs

About 3 billion years ago a new way of obtaining energy evolved. What was it?

• Cellular Respiration

• Photosythesis

• LUCA

• Heterotrophism

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After photosynthesis evolved, oxygen started to accumulate in the atmosphere. This has been dubbed the “oxygen catastrophe.” Why?

• Oxygen bonded with hydrogen to form water. Most cells at this point were not aquatic.

• Increased oxygen in the atmosphere heated Earth to a point where most cells could not survive.

• Most early cells performed Photosynthesis and could not handle large amounts of oxygen.

• Oxygen was toxic to most early cells because they had evolved without it

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