2021 STAAR Biology

Last updated about 4 years ago

50 questions

B.C.10A

B.C.3A

B.C.5C

B.C.2G

B.C.6E

B.C.7C

B.C.12B

B.C.2G

B.C.6B

B.C.12C

B.C.2G

B.C.5A

B.C.12E

B.C.6A

B.C.9A

B.C.2H

B.C.7A

B.C.3A

B.C.7E

B.C.4B

B.C.11B

B.C.2G

B.C.8C

B.C.9C

B.C.3A

B.C.6D

B.C.3A

B.C.7B

B.C.5B

B.C.10B

B.C.2H

B.C.6F

B.C.10A

B.C.2G

B.C.6C

B.C.12E

B.C.2H

B.C.8B

B.C.3E

B.C.4C

B.C.2H

B.C.9A

B.C.12D

B.C.6A

B.C.2G

B.C.8B

B.C.10C

B.C.2H

B.C.6E

B.C.2H

B.C.5A

B.C.7D

B.C.12C

B.C.2G

B.C.2H

B.C.4C

B.C.2H

B.C.7A

B.C.11A

B.C.10B

B.C.2E

B.C.4C

B.C.6G

B.C.10A

B.C.8A

2021 STAAR Biology

2021 STAAR Biology

An illustration of how a particular DNA mutation will most likely affect the polypeptide produced is shown.

What type of mutation is illustrated?

The defenses of two flightless birds that live in different habitats are shown.

How do the wings of the Gentoo penguin and the legs of the common ostrich provide an advantage in their habitat?

Which property is shared by the cells of all living things?

The flow of energy in a grassland ecosystem is shown.

Based on the diagram, which two populations best represent trophic levels that receive the LEAST amount of the total energy provided to the ecosystem by the grass?

The life cycle of a frog is illustrated in the diagram.

Which statement best explains how the cell cycle is important to the life cycle of the frog?

Overfishing is causing the decline of fish populations, such as Eastern Atlantic bluefin tuna in the Mediterranean. Eastern Atlantic bluefin tuna are caught faster than they can reproduce.
Which statement describes the most likely effect that overfishing will have on this ecosystem?

A segment of DNA is shown in the diagram.

Which of these identifies the part of the DNA segment labeled X?

Which statements best compare the function of an ATP molecule to a DNA molecule?

A cladogram of five species is shown.

Based on the cladogram, the ancestral species most likely had —

Which statement describes the process of osmosis in an animal cell?

Sand dunes along the coast are formed of bare sand. Eventually, grasses take root on the dunes. Over time, larger plants such as shrubs and trees are able to grow at the edge of the sand dune ecosystem. This gradual change in plant communities of a sand dune ecosystem can result in —

A researcher determines an organism to be eukaryotic, unicellular, and autotrophic. In which taxonomic group should this organism be classified?

For an enzyme to be able to catalyze a reaction, the active site must —

When multiple transitional fossils are found in many rock layers, they provide evidence of —

Environmental factors typically activate genes in a cell by causing the cell to —

A flower that has both male and female reproductive structures is shown.

Which statement best describes an interaction that will allow a flowering plant to reproduce by self-pollination?

A genetic cross involving two unlinked genes is represented.
AaGG x aaGg
Which genotype is NOT possible in the offspring produced by the cross?

Breaking down food for nutrients involves many body systems. A student made a partial list of the processes that occur.

Which body systems interact most directly in the three listed processes?

A partial DNA segment and an mRNA codon chart are shown.

What amino acid sequence is encoded in the partial DNA segment?

Materials are provided to students to build models of a prokaryotic cell, a eukaryotic cell, and a virus. The materials and the structures they represent are listed in the table shown.

Which material will students use in all three models?

A student makes a Venn diagram to compare the functions of carbohydrates and lipids.

Which cellular function of carbohydrates and lipids should be placed in the shared section of the Venn diagram?

Which statement is an example of how carbon moves through a food chain as part of the carbon cycle?

In Texas Longhorn cattle, coat coloration is an inherited trait. What is the genetic basis of coat-color variation in Texas Longhorn cattle?

The taxonomic classifications of four species of amphibians are shown.

Based on the information provided, which two species are most closely related?

Students construct a graphic organizer to illustrate the different levels of biological organization.

Which term does the letter X represent in the graphic organizer?

When a new mutation occurs in a somatic cell of a sexually reproducing organism, what percentage of the individual’s offspring are likely to inherit the mutation?

The diagram shows the major stages of the cell cycle and the percentage of time spent in each phase.

Which statement best describes why a cell spends the majority of its time in interphase?

The giant octopus lays 20,000 to 100,000 fertilized eggs. After hatching, most octopuses become prey to larger marine organisms, and less than 5% will reach adulthood to reproduce. One benefit of the giant octopus laying many eggs is to —

A food web representing a Gulf Coast ecosystem is shown.

Based on this food web, which organism occupies multiple trophic levels?

A diagram of an HIV infection is shown.

Which conclusion about the HIV infection of a host cell is best supported by the diagram?

Researchers analyzed a mitochondrial gene of different bat species to determine relatedness. A cladogram of their results is shown.

Based on the cladogram, which set of bat species is the least related?

Which statement best describes how bacteria recycle matter in an ecosystem?

2021 STAAR Biology

2021 STAAR Biology

An illustration of how a particular DNA mutation will most likely affect the polypeptide produced is shown.What type of mutation is illustrated?

The defenses of two flightless birds that live in different habitats are shown.How do the wings of the Gentoo penguin and the legs of the common ostrich provide an advantage in their habitat?

Which property is shared by the cells of all living things?

The flow of energy in a grassland ecosystem is shown.Based on the diagram, which two populations best represent trophic levels that receive the LEAST amount of the total energy provided to the ecosystem by the grass?

The life cycle of a frog is illustrated in the diagram.Which statement best explains how the cell cycle is important to the life cycle of the frog?

Overfishing is causing the decline of fish populations, such as Eastern Atlantic bluefin tuna in the Mediterranean. Eastern Atlantic bluefin tuna are caught faster than they can reproduce. Which statement describes the most likely effect that overfishing will have on this ecosystem?

A segment of DNA is shown in the diagram.Which of these identifies the part of the DNA segment labeled X?

Which statements best compare the function of an ATP molecule to a DNA molecule?

A cladogram of five species is shown.Based on the cladogram, the ancestral species most likely had —

Which statement describes the process of osmosis in an animal cell?

Sand dunes along the coast are formed of bare sand. Eventually, grasses take root on the dunes. Over time, larger plants such as shrubs and trees are able to grow at the edge of the sand dune ecosystem. This gradual change in plant communities of a sand dune ecosystem can result in —

A researcher determines an organism to be eukaryotic, unicellular, and autotrophic. In which taxonomic group should this organism be classified?

For an enzyme to be able to catalyze a reaction, the active site must —

When multiple transitional fossils are found in many rock layers, they provide evidence of —

Environmental factors typically activate genes in a cell by causing the cell to —

A flower that has both male and female reproductive structures is shown.Which statement best describes an interaction that will allow a flowering plant to reproduce by self-pollination?

A genetic cross involving two unlinked genes is represented. AaGG x aaGgWhich genotype is NOT possible in the offspring produced by the cross?

Breaking down food for nutrients involves many body systems. A student made a partial list of the processes that occur.Which body systems interact most directly in the three listed processes?

A partial DNA segment and an mRNA codon chart are shown.What amino acid sequence is encoded in the partial DNA segment?

Materials are provided to students to build models of a prokaryotic cell, a eukaryotic cell, and a virus. The materials and the structures they represent are listed in the table shown.Which material will students use in all three models?

A student makes a Venn diagram to compare the functions of carbohydrates and lipids.Which cellular function of carbohydrates and lipids should be placed in the shared section of the Venn diagram?

Which statement is an example of how carbon moves through a food chain as part of the carbon cycle?

In Texas Longhorn cattle, coat coloration is an inherited trait. What is the genetic basis of coat-color variation in Texas Longhorn cattle?

The taxonomic classifications of four species of amphibians are shown.Based on the information provided, which two species are most closely related?

Students construct a graphic organizer to illustrate the different levels of biological organization.Which term does the letter X represent in the graphic organizer?

When a new mutation occurs in a somatic cell of a sexually reproducing organism, what percentage of the individual’s offspring are likely to inherit the mutation?

The diagram shows the major stages of the cell cycle and the percentage of time spent in each phase.Which statement best describes why a cell spends the majority of its time in interphase?

The giant octopus lays 20,000 to 100,000 fertilized eggs. After hatching, most octopuses become prey to larger marine organisms, and less than 5% will reach adulthood to reproduce. One benefit of the giant octopus laying many eggs is to —

A food web representing a Gulf Coast ecosystem is shown.Based on this food web, which organism occupies multiple trophic levels?

A diagram of an HIV infection is shown.Which conclusion about the HIV infection of a host cell is best supported by the diagram?

Researchers analyzed a mitochondrial gene of different bat species to determine relatedness. A cladogram of their results is shown.Based on the cladogram, which set of bat species is the least related?

Which statement best describes how bacteria recycle matter in an ecosystem?

An illustration of how a particular DNA mutation will most likely affect the polypeptide produced is shown.

What type of mutation is illustrated?

The defenses of two flightless birds that live in different habitats are shown.

How do the wings of the Gentoo penguin and the legs of the common ostrich provide an advantage in their habitat?

The flow of energy in a grassland ecosystem is shown.

Based on the diagram, which two populations best represent trophic levels that receive the LEAST amount of the total energy provided to the ecosystem by the grass?

The life cycle of a frog is illustrated in the diagram.

Which statement best explains how the cell cycle is important to the life cycle of the frog?

Overfishing is causing the decline of fish populations, such as Eastern Atlantic bluefin tuna in the Mediterranean. Eastern Atlantic bluefin tuna are caught faster than they can reproduce.
Which statement describes the most likely effect that overfishing will have on this ecosystem?

A segment of DNA is shown in the diagram.

Which of these identifies the part of the DNA segment labeled X?

A cladogram of five species is shown.

Based on the cladogram, the ancestral species most likely had —

A flower that has both male and female reproductive structures is shown.

Which statement best describes an interaction that will allow a flowering plant to reproduce by self-pollination?

A genetic cross involving two unlinked genes is represented.
AaGG x aaGg
Which genotype is NOT possible in the offspring produced by the cross?

Breaking down food for nutrients involves many body systems. A student made a partial list of the processes that occur.

Which body systems interact most directly in the three listed processes?

A partial DNA segment and an mRNA codon chart are shown.

What amino acid sequence is encoded in the partial DNA segment?

Materials are provided to students to build models of a prokaryotic cell, a eukaryotic cell, and a virus. The materials and the structures they represent are listed in the table shown.

Which material will students use in all three models?

A student makes a Venn diagram to compare the functions of carbohydrates and lipids.

Which cellular function of carbohydrates and lipids should be placed in the shared section of the Venn diagram?

The taxonomic classifications of four species of amphibians are shown.

Based on the information provided, which two species are most closely related?

Students construct a graphic organizer to illustrate the different levels of biological organization.

Which term does the letter X represent in the graphic organizer?

The diagram shows the major stages of the cell cycle and the percentage of time spent in each phase.

Which statement best describes why a cell spends the majority of its time in interphase?

A food web representing a Gulf Coast ecosystem is shown.

Based on this food web, which organism occupies multiple trophic levels?

A diagram of an HIV infection is shown.

Which conclusion about the HIV infection of a host cell is best supported by the diagram?

Researchers analyzed a mitochondrial gene of different bat species to determine relatedness. A cladogram of their results is shown.

Based on the cladogram, which set of bat species is the least related?