Question 1 The Cambrian Explosion provided a wealth of fossil remains for scient

Question

Question 1

The Cambrian Explosion provided a wealth of fossil remains for scientists to uncover. Many of the animals from this time period had tough skins or shells. This would

protect the animal from predators.

protect the animal from osmotic pressure.

allow the animals to move into different environments easily.

be a disadvantage for these organisms and lead to their death and fossil formation.

make these animals more desirable to predators.

Question 2

During which geological era did Pangea break apart?

Mesozoic

Proterozoic

Paleozoic

Archean

Cenozoic

Question 3

Eukaryotic cells are thought to have

evolved before prokaryotic cells.

first appeared as parts of multicellular organisms.

appeared about 2.1 billion years ago.

first appeared with tough cell walls.

developed when mitochondria grew much larger in size that they had been previously.

Question 4

When taxonomists classify organisms using a phylogenetic approach, they are most concerned with

outgroups.

ingroups.

ancestral traits.

derived traits.

cladists.

Question 5

Endospores form

in response to adverse conditions.

when the environmental conditions are favorable.

to produce two offspring from every one parental cell.

as a means of genetic recombination.

during binary fission.

Question 6

Which form of bacterial cells is rod shaped?

vibrios

cocci

rhodius

spirilla

bacilli

Question 7

Prions are composed of

DNA.

protein.

DNA and protein.

DNA, RNA, and protein.

RNA.

Question 8

Paleontologists have found fossils dating back 3.6 billion years. These closely resemble

blue-green algae present today.

nothing alive today.

small invertebrate animals.

today

A.

protect the animal from predators.

B.

protect the animal from osmotic pressure.

C.

allow the animals to move into different environments easily.

D.

be a disadvantage for these organisms and lead to their death and fossil formation.

E.

make these animals more desirable to predators.

Explanation / Answer

1-b

2-c

3- e

4-a

5-a

6-e

7-b

8-d

9-e

10-d

11-a

12-c

13-a

14-d

15-c

16-a

17-c

18-d

19-e

20-e

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