AND VERIFIED CORRECT ANSWERS 100

Bio 101 Final- Straighterline EXAM QUESTIONS

AND VERIFIED CORRECT ANSWERS 100%

SCORE A cluster of prokaryotic genes under the control of one regulatory sequence is called a(n)

• repressor.
• promoter.
• operon.
• operator.
• regulator gene. - Ans operon.

A forest contains vegetation that is in constant battle with the many insect caterpillars that eat the vegetation. Which of the following strategies would not be a driving force in this evolutionary battle?

• Plants are selected that evolve strong chemicals (plant alkaloids) that are toxic to the

caterpillar and for which the caterpillars lack digestive enzymes.

• Caterpillars are selected that evolve new enzymes to digest or detoxify the plant

alkaloids.

• Plants are selected that evolve chemicals that slow down or inhibit the digestive

enzymes in the caterpillars so that ingested leaf material passes through before much nutrition can be gained.

• The caterpillars are selected that eat the least leaf material.
• Caterpillars are selected that evolve enzymes to breakdown the chemicals that

interrupt their digestive enzymes. - Ans The caterpillars are selected that eat the least leaf material.

A major difference in the production of transgenic bacteria, plants, and animals is that

• Transgenic bacteria do not pass on their genetic modification to offspring while plants

and animals do.

• Transgenic animals require the use of host animals to carry the genetically modified

embryo while bacteria and plants do not require this.

• Transgenic bacteria and plants receive genes from other species of organisms while

animals are only able to incorporate genes from their own species.

• Transgenic animals are the most useful of the GMOs while transgenic plants and

bacteria are only created to perfect the techniques.

• Transgenic bacteria, animals, and plants can only incorporate genes from their own

species so the process for each species differs from the process for any other species. - Ans Transgenic animals require the use of host animals to carry the genetically modified embryo while bacteria and plants do not require this.

A person with an XO genotype is classified as having 1 / 3

• Down syndrome.
• cri du chat syndrome.
• Turner syndrome.
• Klinefelter syndrome.
• a poly-X state. - Ans Turner syndrome.

A pheasant breeder starts with two birds in the P generation, one of which is AA and the other is aa. If he takes two of the birds from the F1 generation and breeds them together, what can he expect in his F2 offspring?

• AA and Aa.
• Aa and aa.
• AA, Aa, and aa.
• AA only.
• Aa only. - Ans AA, Aa, and aa

A physician specializes in surgery involving the following group of organs: mouth, esophagus, stomach and intestines. Overall, this physician is specialized at which level of organization?

• cell
• tissue
• organ
• organ system
• organism - Ans organ system

A piece of petrified wood was once part of a living organism, but its tissues have been replaced by minerals and it no longer exhibits most properties of life, except for

• organization.
• homeostasis.
• growth and reproduction.
• response to stimuli.
• metabolism. - Ans organization

A possible explanation for a natural event, based on observations and past knowledge, is a

• hypothesis.
• phenomenon.
• control.
• variable.
• theory. - Ans hypothesis
• / 3

A researcher samples the waters of the boiling hot springs in Yellowstone National Park. Under the microscope, she observes what appear to be living cells in the water. If these indeed are living cells, what type of cell would they most likely be?

• eukaryotic, animal
• eukaryotic, plant
• eukaryotic, fungi
• prokaryotic, archaea
• prokaryotic, bacteria - Ans prokaryotic, archaea

A semipermeable membrane sac filled with water and large molecules of potassium is suspended in a beaker of distilled water. What will happen?

• The potassium will leave and the water will enter until both sides reach equal

concentrations.

• Water will enter the sac and it will swell.
• Because the potassium cannot leave, the water cannot enter.
• We cannot determine the outcome unless we know the tonicity of the solutions.
• The potassium will leave the sac and it will shrink. - Ans Water will enter the sac and

it will swell.

According to cell theory

• all organisms are composed of tissues.
• the smallest unit of life is a nucleus.
• animals but not plants are composed of cells.
• a multicellular organism is composed of many cells.
• new cells arise only from preexisting cells. - Ans new cells arise only from preexisting

cells.

According to the operon theory, the function of the regulator gene is to

• code for enzymes in a metabolic pathway.
• serve as an on/off switch for transcription.
• code for a repressor molecule that can bind to the operator.
• bind to the RNA polymerase molecule.
• bind to the promoter. - Ans code for a repressor molecule that can bind to the

operator.

All the banded sunfish () in a pond would comprise a(n)

• population.
• ecosystem.
• community.
• biosphere.
• species. - Ans population
• / 3