Question 1

Which of the following best explains why the fossil record is biased toward certain types of organisms?

Accepted Answer

Organisms with hard parts living in sediment-rich environments are more likely to be preserved.

Question 2

Which process is primarily responsible for the origin of mitochondria in eukaryotic cells?

Accepted Answer

Endosymbiosis of an aerobic bacterium by a host cell

Question 3

A researcher finds a group of animals that includes a common ancestor and all its descendants. This group is best described as:

Accepted Answer

Monophyletic

Question 4

Which of the following is an example of convergent evolution resulting in homoplasy?

Accepted Answer

The wings of birds and bats used for flight

Question 5

Which equation best describes exponential population growth?

Accepted Answer

$$\frac{dN}{dt} = rN$$

Question 6

Which of the following statements about adaptive radiation is correct?

Accepted Answer

It is the rapid diversification of a group into new ecological niches, often after a mass extinction.

Question 7

Which of the following best describes the alternation of generations in land plants?

Accepted Answer

A cycle between multicellular haploid gametophyte and multicellular diploid sporophyte stages

Question 8

A scientist is using a molecular clock to estimate the divergence time between two species. Which of the following is she most likely comparing?

Accepted Answer

The number of nucleotide differences in homologous genes

Question 9

Which of the following is a key innovation that allowed amniotes to reproduce successfully on dry land?

Accepted Answer

The amniotic egg

Question 10

Which of the following best describes the ecological role of cyanobacteria?

Accepted Answer

They are the only prokaryotes that generate oxygen through photosynthesis.

Question 11

Which life cycle is characterized by a dominant haploid stage, as seen in many protists?

Accepted Answer

Zygotic life cycle

Question 12

Which of the following is NOT a characteristic of fungi?

Accepted Answer

Cell walls made of cellulose

Question 13

A population of bacteria is growing in a closed system with limited resources. Which equation best describes its growth as it approaches carrying capacity?

Accepted Answer

$$\frac{dN}{dt} = rN \left(1 - \frac{N}{K}\right)$$

Question 14

Which of the following is a correct match between a group and a key evolutionary innovation?

Accepted Answer

Gnathostomes – jaws

Question 15

Which of the following best describes the difference between protostome and deuterostome development?

Accepted Answer

Protostomes have spiral cleavage and the blastopore becomes the mouth; deuterostomes have radial cleavage and the blastopore becomes the anus.

Question 16

Which of the following is an example of horizontal gene transfer in bacteria?

Accepted Answer

A bacterium acquiring antibiotic resistance genes via conjugation

Question 17

Which of the following is a correct pairing of a fungal mutualism and its partner?

Accepted Answer

Mycorrhiza – plant root

Question 18

Which of the following best describes an r-selected species?

Accepted Answer

Produces many offspring with little parental care in unstable environments

Question 19

Which of the following is a defining feature of animals in the phylum Arthropoda?

Accepted Answer

Jointed appendages and molting (ecdysis)

Question 20

Which of the following is a correct statement about the evolutionary history of life on Earth?

Accepted Answer

Prokaryotes appeared before single-celled eukaryotes.

Origin and History of Life, Phylogeny, Prokaryotes, Protists, Plants, Fungi, Animal Diversity, and Evolutionary Evidence

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