AnswersBiologyUnit Test

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1
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Which best describes derived characteristics?

A
They are newly evolved traits.
B
They appear in all the ancestors.
C
They appear at the end of each branch.
D
They stem from primary characteristics.
2
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Julia is trying to place a duckbilled platypus, lizard, bear, and monkey on a phylogenetic tree. She learns that the duckbilled platypus, bear, and monkey are classified as mammals. She also learns that mammals share a common ancestor with reptiles. Which additional piece of information will be most helpful to Julia to properly build her phylogenetic tree?

A
The platypus has fur like other mammals.
B
The platypus does not have feathers like a bird.
C
The platypus lays eggs like a reptile.
D
The platypus does not have fins like a fish.
3

Why was modern classification invented?

A
Traditional classification could not classify all living things.
B
Scientists realized related organisms do not share similar characteristics.
C
Scientists understood that species share a common ancestor.
D
Modern classification is faster and easier to use.
4

Which describes the modern classification system?

A
based on evolutionary relationships
B
called Linnaean classification
C
based on similar appearances
D
called Darwinian classification
5

Protists are a group of organisms that are characterized as eukaryotes (they have cells with nuclei) that are neither plants nor animals nor fungi. They are very diverse, and there are many hypotheses about their classification. The cladogram for protists is constantly changing and, sometimes, there are opposite hypotheses that both have data to support them. What is the implication of a changing hypothesis?

A
It is acceptable because data are still being collected.
B
It is acceptable because everything in science should always change.
C
It is not acceptable because the correct answer needs to be found.
D
It is not acceptable because science never changes.
6

A scientist discovers a new organism that is related to clownfish. What can the scientist discover by using molecular clocks?

A
the date that the organism first appeared in the fossil record
B
the age of the organism
C
the amount of time that the two species have been evolving apart
D
the number of years that fish have existed
7

Consider the cladogram.Which group of organisms has the derived characteristics of true tissues, bilateral symmetry, and a pseudocoelom?

Question illustration
A
sponges
B
roundworms
C
annelids
D
chordates
8

Consider the diagram.Josiah says this is a phylogenetic tree of the dinosaurs. Maleek says it is a cladogram of the dinosaurs. Who is correct?

Question illustration
A
Josiah is correct.
B
Maleek is correct.
C
Both are correct.
D
Neither is correct.
9

If two organisms are in the same clade, what can you predict about their relationship?

A
They are not closely related.
B
They share a common ancestor.
C
They compete for resources.
D
One organism evolved into the other organism.
10

Which of the following are Phylogenetic trees also know as ?

A
Cladogram
B
Clade
C
Node
D
Linnaean

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