Question 1

Which of the following best defines 'evolution' as used in evolutionary biology?

Accepted Answer

A change in the genetic composition of a population across generations.

Question 2

Which of the following is NOT considered evidence for evolution in living organisms?

Accepted Answer

The presence of identical traits in unrelated species without genetic or developmental evidence

Question 3

A human is born with a true tail containing muscle, nerves, and skin. This is best described as:

Accepted Answer

An atavism

Question 4

Which of the following is the ultimate source of genetic variation in populations?

Accepted Answer

Mutation

Question 5

In the case of the peppered moth (Biston betularia), what was the genetic basis for the black (carbonaria) form?

Accepted Answer

A large transposable element inserted into the first intron of the gene cortex

Question 6

Which of the following best describes a vestigial structure?

Accepted Answer

A reduced or functionless version of a body part that has an important function in a closely related species.

Question 7

Which of the following is an example of a molecular vestige?

Accepted Answer

A pseudogene similar to a functional gene in a related species

Question 8

Why is the presence of pelvic spurs in pythons considered evidence for evolution?

Accepted Answer

They are reduced hind limbs inherited from lizard ancestors, showing descent with modification.

Question 9

Which of the following best explains why the use of antibiotics in EHEC infections is controversial?

Accepted Answer

Antibiotics can trigger the SOS response, leading to Shiga toxin phage mobilization and increased toxin production.

Question 10

Which of the following is a correct statement about horizontal gene transfer in bacteria?

Accepted Answer

It is a principal source of genuinely new genes in bacteria.

Question 11

A population of soapberry bugs shifts to feeding on a new host plant with thinner fruit. Over several generations, the average beak length decreases. This is an example of:

Accepted Answer

Direct observation of microevolution

Question 12

Which of the following is NOT a type of mutation classified by what changes in the sequence?

Accepted Answer

Gene duplication by meiosis

Question 13

Which of the following is a key difference between microevolution and macroevolution?

Accepted Answer

Microevolution refers to changes within populations; macroevolution refers to changes at or above the species level.

Question 14

Which of the following is a requirement for a structure to be considered vestigial?

Accepted Answer

It must be reduced or functionless in one species and functional in a closely related species.

Question 15

Which of the following is a plausible reason why dolphins have many olfactory receptor pseudogenes?

Accepted Answer

Dolphins are descendants of land mammals and no longer need to smell volatile odorants.

Question 16

Which of the following best describes the process of selective breeding?

Accepted Answer

Humans choose which individuals reproduce based on desired traits, causing rapid changes in populations.

Question 17

Which of the following is a correct statement about pseudogenes?

Accepted Answer

They are nonfunctional sequences similar to functional genes, often remnants of once-functional genes.

Question 18

Which of the following is an example of a regulatory mutation?

Accepted Answer

A mutation that changes when, where, or how much a gene is expressed, without altering the coding sequence.

Question 19

Which of the following is a reason why hypertrichosis is NOT considered a proven atavism?

Accepted Answer

It is caused by different genetic changes in different families and does not reactivate an ancestral developmental program.

Microbial Evolution: Evidence and Mechanisms in Living Organisms

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