Question 1

Which of the following best describes a phylogenetic tree?

Accepted Answer

A branching diagram that reflects hypothesized evolutionary relationships based on common ancestry.

Question 2

Which equation correctly represents the overall reaction of photosynthesis?

Accepted Answer

$$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6$ + 6O_2$$

Question 3

Cyanobacteria are considered crucial in Earth’s history because they:

Accepted Answer

Produced oxygen through photosynthesis, leading to the oxygenation of Earth’s atmosphere.

Question 4

Which of the following is a synapomorphy?

Accepted Answer

A trait that is shared by all members of a clade and originated in their last common ancestor.

Question 5

Which domain of life includes organisms with cells that have a nucleus?

Accepted Answer

Eukarya

Question 6

A student is analyzing a phylogenetic tree and notices that birds and crocodiles share a more recent common ancestor with each other than with mammals. What does this imply?

Accepted Answer

Birds and crocodiles are more closely related to each other than to mammals.

Question 7

Which of the following is an example of homoplasy?

Accepted Answer

The presence of wings in bats and birds due to convergent evolution.

Question 8

What is the main metabolic reaction performed by cyanobacteria that is essential for life on Earth?

Accepted Answer

Photosynthesis producing oxygen and glucose.

Question 9

Which of the following best explains why scientific names are preferred over common names in biological classification?

Accepted Answer

Scientific names are unique and standardized globally, reducing confusion.

Question 10

Which of the following is NOT a principal domain of life?

Accepted Answer

Virus

Question 11

A clade is defined as:

Accepted Answer

An ancestor and all of its descendants.

Question 12

Which of the following is a correct example of binomial nomenclature?

Accepted Answer

Homo sapiens

Question 13

Why did the rise of oxygen in Earth’s atmosphere favor the diversification of eukaryotes?

Accepted Answer

Oxygen allowed for more efficient aerobic metabolism, supporting larger and more complex cells.

Question 14

Which of the following statements about tree thinking is correct?

Accepted Answer

The root of a phylogenetic tree represents the original common ancestor of all included taxa.

Question 15

Which process is responsible for the conversion of atmospheric nitrogen ($$N_2) $$into a form usable by living organisms?

Accepted Answer

Nitrogen fixation

Question 16

If two species are sister taxa on a phylogenetic tree, what does this indicate?

Accepted Answer

They share a more recent common ancestor with each other than with any other species.

Question 17

Which of the following is a derived trait?

Accepted Answer

A trait that evolved in a lineage after it diverged from its ancestor.

Question 18

Which of the following best describes the role of cyanobacteria in the nitrogen cycle?

Accepted Answer

They convert $$N_2$$ gas into ammonia, making nitrogen available for other organisms.

Question 19

Which of the following is an example of convergent evolution?

Accepted Answer

The development of wings in insects and birds.

Question 20

A scientist discovers a new organism with a nucleus and the ability to photosynthesize. To which domain does this organism most likely belong?

Accepted Answer

Eukarya

Principles of Phylogeny and Evolution of Photosynthetic Life

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