Chapter 25 Flashcards Preview

Bio > Chapter 25 > Flashcards

Flashcards in Chapter 25 Deck (16):
0

Three compounds or structures found in cells that have been generated abiotically in the lab.

Organic molecules: amino acids, rna nucleotides, lipids
Polymers: proteins rna
Membrane "protocells"

1

The age of fossils can be determined using the decay of

Radioactive isotopes

2

Break down spontaneously over time at a constant rate

Radioactive isotopes

3

Life on earth probably originated how many years ago?

3.9 billion years ago

4

For the first 1.5 billion years, life on earth consisted of

Prokaryotic organisms

5

Prokaryotic organisms began to significantly increase the amount of what in the environment?

O2

6

Eventually some cells engulfed other cells, forming

Eukaryotic organisms

7

Many of the animal phyla we observed in lab first showed up in the fossil record during the

Cambrian explosion

8

What did the earliest land plants have a relationship with, which helped them absorb minerals and water?

Fungi

9

About 250 million years ago, all the major landmasses on earth were joined together in a single continent called

Pangea

10

The physical separation of continents since that time has promoted

Allopatric speciation

11

The Permian mass extinction, which wiped out 96% of marine animal species, was caused by gasses spewing from

Volcanoes

12

The Cretaceous mass extinction, which killed the dinosaurs, was likely caused by an

Asteroid

13

Many scientists argue that a sixth mass extinction is now under way, caused by

Human actions

14

New species evolve to fill vacant niches (positions in the ecosystem)

Adaptive radiation

15

How would you respond to an argument against Darwin citing eyes as proof?

Less complex structures become more and more complex over time