Biology Study guide - Part 2 - Evolution Essay Example

Biology Study Guide
Which one of the following statements is false?
Selected Answer: a - Biology Study guide introduction.
Factors that alter DNA and make cells cancerous are called carcinogens.

Which one of the following is false?
Selected Answer: b. DNA packing tends to promote gene expression.

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More Evolution Essay Topics.

Silencers are sites in DNA that
Selected Answer: c. bind repressor proteins to inhibit the start of transcription.

Proteins that bind to DNA and turn on operons by making it easier for RNA polymerase to bind to a promoter are called
Selected Answer: d. activators.

Which of the following best expresses the degree of success that has been attained in the cloning of humans?
Selected Answer: d. A cloned human embryo developed to the blastocyst stage.

Which one of the following is false?
Selected Answer: d. A mutation in a tumor-suppressor gene can stop cell division immediately.

Which of the following permits a single gene to code for more than one polypeptide?
Selected Answer: b. alternative RNA splicing

Which of these mechanisms of controlling gene expression occurs outside of the nucleus?
Selected Answer: e. translation

RNA splicing involves the
Selected Answer: c. removal of introns from the molecule.

The expression of the tryptophan operon is controlled by
Selected Answer: c. a repressor that is active when it binds to tryptophan.

Which one of the following statements is false?
Selected Answer: a. Factors that alter DNA and make cells cancerous are called carcinogens.

Which one of the following is false?
Selected Answer: b. DNA packing tends to promote gene expression.

Silencers are sites in DNA that
Selected Answer: c. bind repressor proteins to inhibit the start of transcription.

Proteins that bind to DNA and turn on operons by making it easier for RNA polymerase to bind to a promoter are called
Selected Answer: d. activators.

Which of the following best expresses the degree of success that has been attained in the cloning of humans?
Selected Answer: d. A cloned human embryo developed to the blastocyst stage.

Which one of the following is false?
Selected Answer: d. A mutation in a tumor-suppressor gene can stop cell division immediately.

Which of the following permits a single gene to code for more than one polypeptide?
Selected Answer: b. alternative RNA splicing

Which of these mechanisms of controlling gene expression occurs outside of the nucleus?
Selected Answer: e. translation

RNA splicing involves the
Selected Answer: c. removal of introns from the molecule.

The expression of the tryptophan operon is controlled by
Selected Answer: c. a repressor that is active when it binds to tryptophan.

The disease phenylketonuria (PKU) is caused by a recessive allele, and one child in 10,000 is born with the disease. Let q represent the frequency of the PKU allele. What is the value of q2? (Fetuses with PKU are no likelier than other fetuses to die before birth.)

Selected Answer: c. 0.0001

Which of the following is a false concept?
Selected Answer: a. organisms develop a characteristic when they need to

Darwin’s ship was the:
Selected Answer: a. HMS Beagle

Large antlers in male elk, which are used for battles between males, are a good example of
Selected Answer: a. intrasexual selection.

Darwin found that Galápagos animals resembled species of the South American mainland
Selected Answer: b. more than they resembled animals on similar but distant islands.

Broccoli and cabbages are both descended from the same wild mustard and can still interbreed. The existence of these two vegetables is an example of
Selected Answer: b. artificial selection.

The degree of adaptation that can occur in a population is limited by
Selected Answer: d. the amount and kind of genetic variation in a population.

What was Darwin’s job on board the Beagle?
Selected Answer: b. ship’s naturalist

Aristotle believed which of the following?
Selected Answer: c. species are fixed (permanent) and do not evolve

Which of the following assumptions was not part of Darwin’s theory of natural selection?
Selected Answer: a. Traits are inherited as discrete particles.

Which of the following types of reproductive barriers separates two species that occasionally mate but in whom the sperm do not produce the right enzymes to enter the egg?
Selected Answer: e. gametic isolation

A mountain range divides a freshwater snail species into two isolated populations. Erosion eventually lowers the range and brings the two populations together again, but when they mate, the resulting hybrids all produce sterile young. This scenario is an example of

Selected Answer: b. allopatric speciation.

Which of the following types of reproductive barriers separates a pair of insect species that could interbreed except that one mates on goldenrod flowers and the other on autumn daisies that blossom at the same time?

Selected Answer: b. habitat isolation

Hybrids are most often
Selected Answer: a. sterile

Which one of the following is an example of a hybrid that is both vigorous and steril
Selected Answer: d. a mule

The retention in the adult of features that were juvenile in its ancestors is a phenomenon known as
Selected Answer: d. paedomorphosis

One of our best fossil records is of
Selected Answer: a. modern human

Speciation without geographic isolation is called __________ speciation.
Selected Answer: d. sympatric

Which of the following types of reproductive barriers separates two flowering plant species that could interbreed except that one has a deep flower tube and is pollinated by bumblebees, whereas the other has a short, narrow flower tube and is pollinated by honeybees?

Selected Answer: d. mechanical isolation

Which one of the following statements about the Galápagos finches is false?
Answer: c. The common ancestor of the Galápagos finches appears to have come from the island of Cocos.

Which of the following phenomena can be caused by continental drift?
Selected Answer: e. All of the choices are correct.

The three domains are:
Selected Answer: b. bacteria, archaea, eukarya

One of the strongest lines of evidence of a meteor impact in the late Cretaceous is
Selected Answer: d. a thin layer of iridium.

The three-domain system
Selected Answer: c. subdivides the prokaryotes into 2 different domains.

Structures that evolved from the same structure in an ancestor are
Selected Answer: a. homologous.

How many periods of mass extinction have occurred in the last 600 million years?
Selected Answer: d. six

Geologists call the forces within Earth that cause movements of the crust
Selected Answer: b. plate tectonics.

Plants and animals first became established on land during the
Selected Answer: d. Paleozoic.

Which of the following eras is often called the “Age of Reptiles”?
Selected Answer: d. Mesozoic

Potassium-40 can be used to date fossils that are up to approximately how old?
Selected Answer: b. several hundred million years

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