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Lesson 6 Exam


Question 1

2.5 / 2.5 points

Which one of the following is the only domain that contains eukaryotes?

Question options:










Question 2

2.5 / 2.5 points


RNAs that can act as enzymes are called:

Question options:










Question 3

2.5 / 2.5 points


You discover a prokaryote that can make its own food in the absence of light. Nutritionally, you would classify this prokaryote as a:

Question options:










Question 4

2.5 / 2.5 points


The science of naming, identifying, and classifying organisms is called:

Question options:










Question 5

2.5 / 2.5 points


Which of the following is a colonial form of green algae?

Question options:










Question 6

2.5 / 2.5 points


Which of the following is NOT true?

Question options:


The great diversification of   animals occurred during the Cambrian explosion.


For most of biological history,   life was confined to aquatic habitats.


The evolution of multicellularity   took place after the origin of the eukaryotes.


The first organisms to colonize   land were animals.


Question 7

2.5 / 2.5 points


Feathers in birds appear to have first evolved for insulation but later conveyed a new advantage in helping create light aerodynamic surfaces. This switch in function is an example of:

Question options:




punctuated equilibrium.


convergent evolution.


an exaptation.


Question 8

2.5 / 2.5 points


Molecular systematics might examine all of the following types of data EXCEPT:

Question options:




DNA sequences.


amino acid sequences.


anatomical features.


Question 9

2.5 / 2.5 points


__________ are responsible for toxic red tides.

Question options:


Plasmodial slime molds




Red algae




Question 10

2.5 / 2.5 points


Speciation requires:

Question options:


periods of rapid evolutionary   change.


geographic isolation.


long periods of time.


genetic isolation.


Question 11

2.5 / 2.5 points


An ancestral species and all its evolutionary descendants define a:

Question options:










Question 12

2.5 / 2.5 points


Prokaryotes reproduce by means of:

Question options:




binary fission.






Question 13

2.5 / 2.5 points


Endosymbiosis explains the origin of the __________ of eukaryotes.

Question options:


chloroplasts and mitochondria


endomembrane system


nuclear envelope


membrane-bound organelles


Question 14

2.5 / 2.5 points


Which of the following would be an example of paedomorphosis?

Question options:


Starfish regenerating severed   limbs


Rapid evolution in a small,   isolated population


Two species evolving a similar   appearance


The ability to reproduce evolving   in caterpillars


Question 15

2.5 / 2.5 points


The wing of a penguin is __________ the wing of a butterfly.

Question options:


structurally identical to


superior to


homologous to


analogous to


Question 16

2.5 / 2.5 points


The absence of __________ in the primitive atmosphere was essential to the origin of life on Earth.

Question options:










Question 17

2.5 / 2.5 points


A period of mass extinction is often followed by:

Question options:


explosive diversification.


nonbranching evolution.


global cooling.




Question 18

2.5 / 2.5 points


Land was first colonized about __________ years ago.

Question options:


100 million


500 million


1.7 billion


2.5 billion


Question 19

2.5 / 2.5 points


Of the following taxonomic levels, species found within the same __________ are the most closely related.

Question options:










Question 20

2.5 / 2.5 points


Variation among pre-cells was due to:

Question options:


genetic drift.


natural selection.


the bottleneck effect.




Lesson 5 Exam


Question 21

2.5 / 2.5 points

Which one of the following statements is true?

Question options:


Natural selection works on   variation already present in a population.


Natural selection works on   non-heritable traits.


Individuals evolve through natural   selection.


Organisms evolve structures that   they need.


Question 22

2.5 / 2.5 points


The oldest known fossils are from about __________ years ago.

Question options:


3.5 billion




4.0 million


1.0 billion


Question 23

2.5 / 2.5 points


While on the Beagle, Darwin was influenced by a book by Charles Lyell that suggested that Earth was __________ and sculpted by geologic processes that __________ today.

Question options:


old; continue


old; no longer occur


young; continue


young; no longer occur


Question 24

2.5 / 2.5 points


The human genome contains approximately __________ genes.

Question options:










Question 25

2.5 / 2.5 points


Which one of the following can create new alleles?

Question options:


Bottleneck Effect


Sexual reproduction




Founder Effect


Question 26

2.5 / 2.5 points


The presence of freckles is due to a dominant allele. Four percent of the individuals in a particular population lack freckles. Use the Hardy-Weinberg formula to calculate the percentage of individuals in this population who are homozygous dominant for freckles.

Question options:










Question 27

2.5 / 2.5 points


Your family is taking a long driving vacation across the midwestern and western United States. As you travel, you notice that the flowers, birds, and trees of the Midwest and the Rocky Mountains are very different. As you ponder why, you remember that such differences in the distribution of species are part of the field of:

Question options:










Question 28

2.5 / 2.5 points


The Human Genome Project has the potential to:

Question options:


lead to treatments for inherited   diseases.


lead to treatments for contagious   diseases.


increase our understanding of the   historical relationships among species.


play a role in all of the above   answer choices.


Question 29

2.5 / 2.5 points


The possibility that Mongolian ruler Genghis Khan spread an unusual chromosome to nearly 16 million men living today resulted from studies of:

Question options:






the X chromosome.


the Y chromosome.


Question 30

2.5 / 2.5 points


A DNA fragment with a sticky end that reads -ATTCG will bind with another DNA fragment with a sticky end that reads:

Question options:










Question 31

2.5 / 2.5 points


Genetically modifying human __________ cells may directly affect future generations.

Question options:










Question 32

2.5 / 2.5 points


The scientific field that studies complete sets of genes is called:

Question options:




recombinant DNA.




restriction enzyme.


Question 33

2.5 / 2.5 points


Which enzyme is used to bind DNA fragments together?

Question options:


Restriction enzyme




DNA ligase


DNA polymerase


Question 34

2.5 / 2.5 points


Which of the following is NOT a requirement of natural selection?

Question options:


Differential reproductive success


Overproduction of offspring


Genetic variation


Catastrophic events


Question 35

2.5 / 2.5 points


The total collection of alleles in a population at any one time make up that population’s:

Question options:


gene pool.






polymorphic pool.


Question 36

2.5 / 2.5 points


You are attempting to link an individual to a crime. The only evidence you have is a tiny drop of blood. How can you use this drop of blood to make the association?

Question options:


You can use the sample to   determine the individual’s ABO blood group.


You can use gel electrophoresis to   determine the length of the DNA found in the sample.


You can use PCR to increase the   amount of DNA available for restriction fragment analysis.


You can use the sample to check   for the presence of the Rhesus factor.


Question 37

2.5 / 2.5 points


Natural selection results in:

Question options:


increased genetic variation.


a population that is better   adapted to a future environment.


a population that is adapted to   its current environment.


an increase in the size of a   population.


Question 38

2.5 / 2.5 points


Which of the following is most likely to decrease genetic variation?

Question options:


Directional selection




Stabilizing selection


Diversifying selection


Question 39

2.5 / 2.5 points


Nucleic acid probes are used to:

Question options:


find a specific nucleotide   sequence.


isolate bacterial genes.


destroy clones that do not carry   the recombinant plasmid of interest.


synthesize a RNA strand   complementary to a stickyend.


Question 40

2.5 / 2.5 points


A collection of cloned DNA fragments that includes an organism’s entire genome is called a:

Question options:


phenotypic library.


gene repository.


clone collection.


genomic library.

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