Comparing DNA

If one side of DNA is ATTA what would the complementary strand look like?

• CGGC

• GCCG

• TAAT

• ATTA

The shape of DNA looks like a twisted ladder, known as

• helicase

• a double helix

• a triple helix

Recently, scientists have been able to use ___________to find common proteins and amino acids to determine how closely related species are.

• DNA

• Vestigial structures

• Fossils

• Homologous structures

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NGSS.HS-LS4-1

According to this data, the unknown bacterial species is most closely related to: 

• Species I

• Species II

• Species III

• Species IV

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NGSS.HS-LS3-1

Two organisms that are closely related would have

• very similar DNA sequence

• exactly the same DNA sequences

• no proteins in common

• completely different DNA sequence

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NGSS.HS-LS3-1

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Common ancestry relates to evolution because

• evolution only happens when there are common ancestors.

• Common ancestors make evolution happen more quickly.

• evolution can never take place with common ancestors.

• the more two organisms have in common, the more recent is their common ancestor during their evolution.

Tags

NGSS.HS-LS4-1

When comparing the DNA of two different organisms, the more differences in the DNA base pairs the more-

• Closely related they are.

• Distantly related they are.

• It doesn't prove anything.

• They look alike.

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NGSS.HS-LS4-1

NGSS.HS-LS4-2

What conclusions can be made based on this table shown?

• the American black bear and the giant panda are most closely related

• the giant panda and the red panda are most closely related

• the red panda and the racoon are the most closely related

• the giant panda and the racoon are most closely related

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NGSS.MS-LS4-2

What number is the common ancestor of C and D

• 1

• 2

• 3

• 4

Tags

NGSS.HS-LS4-1

Observe the two fish in the image. The cave fish and minnow are genetically related to each other and are similar in many ways. The cave fish lives very deep in the ocean where there is no light. It has only the remnants of eyes and is blind. Minnows live in shallow waters where the water has light. Their eye sight is important for their survival. Which statement below best describes these two fish?

• The DNA of the cave fish has changed over time to differ from the minnow. Since there is no light where the cave fish lives, it was not necessary to have working eyes. Over time, mutations occurred which proved to improve the survival of the cave fish, which is why they are now blind and have only physical remnants of eyes.

• The DNA has not mutated over time and despite all of the evidence that suggests these two are genetically similar, one has eyes and the other does not so they must not be related.

• Cave fish must have been attacked by predators, which is why they only have the remnants of eyes.

Tags

NGSS.HS-LS3-1

NGSS.HS-LS3-2

NGSS.HS-LS4-2

NGSS.HS-LS4-4