Unit 1
Unit 2
Mystery Unit
Unit 3
Unit 4
100

The graph shows the changes in the amount of land used for agriculture and the number of species present in an area during an 80-year period.

Based on the information in the graph, what can be argued about the impact of using land for agriculture on ecosystems?

A. Using land for agriculture increases the total number of organisms in an area.  

 B. Using land for agriculture decreases the pollution in the atmosphere. 

C. Using land for agriculture increases the food available to native wildlife. 

D. Using land for agriculture decreases the biodiversity of an area.

D. Using land for agriculture decreases the biodiversity of an area.

100

During which stage of photosynthesis is oxygen produced? 

A. Calvin cycle 

B. electron chain 

C. light dependent 

D. light independent 

C. light dependent

100

A human body cell has 46 chromosomes. Which diagram represents mitosis in a human body cell? A

B

C

D

A

100

How does DNA determine a trait such as eye color of an organism? 

A. It interacts with proteins that control eye color. 

B. It codes for mRNA that directly determines eye color. 

C. It codes for proteins that directly determine eye color. 

D. It produces pigments that make up eye color. 

C. It codes for proteins that directly determine eye color.

100

The diagram shows four different species of birds. Each species has a different beak shape. Which statement explains how these different beak shapes developed? 

A. natural selection based on diet 

B. selective breeding by humans 

C. resistance to herbicides through continued exposure 

D. inheritance of acquired characteristics

A. natural selection based on diet

200

Can Earth’s human population increase indefinitely? 

A. yes, even though resources are finite 

B. yes, because resources are infinite 

C. no, even though resources are infinite 

D. no, because resources are finite

D. no, because resources are finite

200

Which step is a part of the dark (light-independent) reactions? 

A. ATP molecules are produced. 

B. Solar energy is absorbed by chloroplasts. 

C. Oxygen is released when water molecules are split. 

D. Carbon dioxide is used to form simple sugars.

D. Carbon dioxide is used to form simple sugars.

200

The graphic shows the processes involved in the cell cycle. 

The cell cycle is necessary in order for new cells to replace damaged or dead cells. In which part of the cycle are new cells formed? 

A. Growth 

B. DNA Synthesis 

C. Preparation for Division 

D. Mitosis

D. Mitosis

200

A section of DNA codes for the sequence of nitrogenous bases of mRNA to initiate protein synthesis as shown. 

What is the process involved in the coding? 

A. replication 

B. transcription 

C. transduction 

D. translation 

B. transcription

200

The table lists key features of the fossil of a small dog-sized mammal that lived around 55 million years ago. 

What can be inferred from this? 

A. The mammal is a primitive ancestor of the modern horse. 

B. The mammal is a primitive ancestor of the modern wolf. 

C. Carnivores began to evolve about 55 million years ago. 

D. Most of the Earth’s surface was grasslands about 55 million years ago. 

A. The mammal is a primitive ancestor of the modern horse.

300

What will most likely happen to a stable ecosystem when a population of animals exceeds the ecosystem’s carrying capacity? 

A. The ecosystem will improve. 

B. The ecosystem will degrade. 

C. The ecosystem will change type. 

D. The ecosystem will remain unchanged. 

B. The ecosystem will degrade.

300

Examine the diagram of a chloroplast. 

What are the products of the light-dependent and light-independent reactions, labeled Y and Z, respectively? 

A. Y: carbon dioxide; Z: water 

B. Y: cellulose; Z: glycerol 

C. Y: oxygen; Z: glucose 

D. Y: sugars; Z: oxygen 

C. Y: oxygen; Z: glucose

300

The diagram shows two ways in which an organism obtains energy in the form of ATP.

Which component is represented by the letter X in the diagram? 

A. Heat 

B. Hydrogen 

C. Oxygen 

D. Water

C. Oxygen

300

Use the messenger RNA codon chart to answer the question. 

Which section of mRNA codes for the protein with this sequence of amino acids leucine-glutamine lysine-tryptophan? 

A. CUC-CAA-AAA-UGA 

B. CUA-GAA-AAG-UGA 

C. CCU-CAA-UUA-UGG 

D. CUU-CAG-AAA-UGG

D. CUU-CAG-AAA-UGG

300

A scientist found the fossil of a land animal in a rock that appears to be 370 million years old. The fossil had a fin and 8 digits similar to the 5 fingers of a human. 

Which question will the fossil help the scientist investigate? 

A. Does the fossil show the transition of animals from sea to land? 

B. Do all fossils show evidence of the transition between 2 life forms? 

C. Why are fossils of organisms different in different layers of Earth? 

D Was this fossil a more advanced life form that evolved after mammals?

A. Does the fossil show the transition of animals from sea to land?

400

The Arctic tundra is covered by a thick frozen soil layer called permafrost. The surface of the ground above this layer thaws during the summer. Microorganisms and some plants with shallow roots are able to survive in this thawed layer. 

Which factor most limits the diversity of life in the Arctic tundra during the summer? 

A. the amount of water 

B. the amount of sunlight 

C. the amount of fertile soil 

D. the amount of available space

C. the amount of fertile soil

400

The graph shows the effects of various factors on the rate of photosynthesis.

What can be inferred from the graph? 

A. Light is the only factor that affects the rate of photosynthesis. 

B. The rate of photosynthesis is independent of the intensity of the given factors. 

C. The rate of photosynthesis decreases when the intensity of the given factors increases. 

D. Light, temperature, and carbon dioxide are limiting factors for the rate of photosynthesis.

D. Light, temperature, and carbon dioxide are limiting factors for the rate of photosynthesis.

400

Which level of cellular organization is the most complex? 

A. cells 

B. organelles 

C. organs 

D. tissues

C. organs

400

The genetic information of an organism is transferred in three different processes as listed.

Which option identifies the processes listed? 

A. 1: replication; 2: translation; 3: transcription 

B. 1: replication; 2: transcription; 3: translation 

C. 1: transcription; 2: replication; 3: translation 

D. 1: transcription; 2: translation; 3: replication

B. 1: replication; 2: transcription; 3: translation

400

Genetic changes can occur frequently in individuals in a population, but not all of the changes get passed along to offspring because these changes are not always good. In order to be beneficial and increase the likelihood that a trait will be passed on to its offspring, any genetic change would have to increase what attribute of the individual? 

A. appendages 

B. fitness 

C. size 

D. speed

B. fitness

500

Polar bears hunt, mate, and usually make their dens on sea ice. They hunt primarily for seals that can be found near breathing holes or at places where there are breaks in the ice. 

How would polar bears most likely be affected by an increase in Arctic temperatures? 

A. There would be a reduction in the polar bear death rate. 

B. There would be more seals available for polar bears to consume. 

C. There would be more opportunities for polar bears to catch seals. 

D. There would be fewer places for polar bears to reproduce.

D. There would be fewer places for polar bears to reproduce.

500

Which balanced chemical equation represents aerobic cellular respiration? 

A. 

B. 

C. 

D

B.

500

The diagram shows the phases of mitosis in an animal cell.

When does cytokinesis occur? 

A. after prophase is complete 

B. after telophase is complete 

C. during anaphase when the chromosomes are being separated 

D. during interphase when the DNA is being replicated

B. after telophase is complete

500

The diagram shows a section of a nucleic acid. 

What is formed by all of the components shown in the circled portion of the molecule? 

A. amino acid 

B. nitrogen base 

C. nucleotide 

D. phosphate

C. nucleotide

500

A farmer sprays an insecticide on his tomato plants to kill the insects that are eating the leaves. Some of the insects are resistant to the pesticide. 

What process is demonstrated by this example? 

A. abiogenesis 

B. bioaccumulation 

C. biogenesis 

D. evolution

D. evolution

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