Unit 9 notes 1 Flashcards

1
Q

Define sponstaneous generation

A

the idea that non - living material can produce live

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2
Q

What did franchisco Redi and Louis Pasteur do?

A

disproved sponstaneous generation

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3
Q

Define biogenesis

A

all living organisms come from only other living things

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4
Q

What had to occur before life could appear on earth?

A
  1. simple organic molecules (have carbon) must have formed
  2. these simple organic molecules must have came together to from, proteins, carbs, and nucleic acids
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5
Q

What was earths early atmosphere like?

A
  • no oxygen
  • had water vapor, carbon dioxide, nitrogen, and nucleic acid
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6
Q

What was Alexander Oparin’s hypothesis?

A

That life began in the oceans when energy from the sun, lightning, and Earth’s heat triggered chemical reactions that made small molecules from substances present in the atmosphere

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7
Q

What did Miller and Urey do?

A

Mixed water vapor, ammonia, methane, and hydrogen gas together in a flask, then sent an electric shock throught the flask
(recreate primordial soup)

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8
Q

What did Miller and Urey find when they recreated the primordial soup?

A

amino acids and sugars

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9
Q

define protocells

A

A structure surrounded by a membrane`

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10
Q

What formed protocells?

A

scientist believe that amino acids came together to from protocells

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11
Q

How long ago did fossils show that prokaryotic cells existed on earth?

A

fossils show that prokaryotic cells existed on earth 3.5 million years ago

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12
Q

What were the first prokaryotic cells like?

A

The first prokaryotic cells were anaerobic and heterotrophic

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13
Q

Why did the first prokaryotic cells evlove into archebacteria?

A

Because eventually they used up all the food and evloved into archebacteria

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14
Q

define archebacteria

A

prokaryotes that live in harsh environments

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15
Q

what do archebacteria use for food?

A

chemosynthesis

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16
Q

define chemosynthesis

A

to use chemicals in the environment for food

17
Q

What does prokaryote photosynthesising evolve?

A

prokaryotes used energy from the sun to make food

18
Q

What led to an increase in oxygen in Earth atmosphere?

A

Prokaryotes photosynthesising gave off oxygen

19
Q

How did plant and animal cells form?

A

Endosymbiosis

20
Q

define endosymbiosis

A

When one organism lives inside another organisms