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Bio 200 > Lecture 2 > Flashcards

Lecture 2 Flashcards

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Biology 101 flashcards
0
Q

Formation of the sun

A

Hydrogen -> helium = sun + energy

Ring around the sun due to gravity

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1
Q

Protoplanetary disk

A

A cloud of disk containing hydrogen and helium, supa nova event, stars are destroyed, sun is in the center, allow preplanet

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2
Q

Protoplanet

A

Gravity from the sun, 4.6 bya

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3
Q

Precambrian supereon

A

Divided into three eons, 2nd two eons are divided into eras

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4
Q

Paleozoic era

A

543 mya to 250 mya

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5
Q

Mesozoic era

A

250 mya to 65 mya

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6
Q

Cenozoic era

A

65 mya to now

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7
Q

Hadean eon

A

He’ll towards end: cloud forms, steam from core

Uninhabitable

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8
Q

Archean eon

A

Arches and bacteria live

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9
Q

Cyanobacteria mats/ stromatolites

A

Unicellular

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10
Q

Unicellular vs multicellular

A

1 bya multicellular arises in late Precambrian eon

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11
Q

Trilobites

A

During Paleozoic era

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12
Q

Archeocyanthids

A

Started the animal tree; led to the modern sponges

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13
Q

1st plants

A

Cambrian period

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14
Q

1st land animals

A

Cambrian period

They were amphibians

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15
Q

Permian extinction

A

Oxygen level dropped, about 60% extinct

16
Q

Age of reptiles

A

250 mya to 65 mya

17
Q

1st mammal

A

Mesozoic 200 mya

Morganucodon watsoni

18
Q

K-T extinction event

A

65 mya
Associated with KT boundary
Caused by 1 or more catastrophic event
Reduced sunlight, no photosynthesis

19
Q

Geological clock

A

Earth’s history is very long

Precambrian most if the clock

20
Q

Continental drift

A

Oxygen level changes
Climate changes
Parallel time scale
Forcing continents together or apart

21
Q

What is life?

A
  1. Organized

2. Replicated itself

22
Q

Four steps to form life

A
  1. Abiotic synthesis of organic material
  2. Formation of polymers
  3. Formation of protobionts
  4. Origin of heredity materials
23
Q

Miller and Urey’s experiment

A

1955
Reproduced the conditions of young earth
Was wrong
Earth was dominated by CO2 and N2

24
Q

Building blocks of life

A

Nucleotides, lipids, ATP, amino acids

Bio 200 (2 decks)

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