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Which hypothesis is best supported by this graph? A. The cardinals’ food supply increased C. Dominant cardinal chicks were the first to be fed B. A disease of cardinals spread throughout the park. D. The population of cardinal predators increased

A. The cardinals’ food supply increased Back to Board

The pictures above show a cow and a bull and their calf. All three have coats of the same colors. This calf developed from a zygote. During the development of the zygote, a mutation occurred in a coat color gene. Which of the following best explains why the calf’s phenotype is the same as its parents? A. The mutation is not present in the parent animals. B. The mutated gene is passed on during reproduction C. The mutation does not affect the expression of the color trait. D. The mutated allele is dominant over the parental allele.

C. The mutation does not affect the expression of the color trait. Back to Board

Humans could make the environment much more sustainable if technology could derive most of the world’s energy supply from A. coal B. The sun C. wood D. Fossil fuels

B. The sun Back to Board

Miller and Urey's experiments proved that A. complex organic molecules can form spontaneously under conditions that probably existed on the early earth C. RNA can act as an enzyme and assemble new RNA molecules from RNA templates B. life evolved on earth from inanimate chemicals D. bacteria were the first type of living organism to appear on the earth

A. complex organic molecules can form spontaneously under conditions that probably existed on the early earth Back to Board

A growth curve for a population of crabs on a coral reef is shown above. Which statement best explains what is happening at point A ? A. Population growth decreases as individual crabs get older. B. Destruction of habitat is causing a decline in the population of the crabs. C. The introduction of a new predator is causing a decline in population growth of the crabs. D. The population is stabilizing as it approaches carrying capacity.

D. The population is stabilizing as it approaches carrying capacity. Back to Board

On island chains like the one shown below, animal populations that spread from the main island to the other islands can evolve into separate species. A. Predators on the main island can easily migrate to follow the populations to the other islands. B. Lack of disease on the other islands enables the populations to grow and change without limit. C. The physical separation of the islands limits gene flow and interbreeding between the populations D. The climatic conditions of the islands allow the populations to breed all year and produce several generations.

C. The physical separation of the islands limits gene flow and interbreeding between the populations Back to Board

The results of Pasteur’s experiment helped Pasteur to A. isolate the virus responsible for smallpox B. reject theory of spontaneous generation. C. produce a vaccine against rabies D. convince people to cover food

B. reject theory of spontaneous generation. Back to Board

Why do leaves tend to be flat? A. so that water can easily be absorbed and carried to the rest of the plant B. so that nutrients can easily enter the plant and be used for structure and support C. so that sunlight can easily penetrate to the leaf’s photosynthetic tissues D. so that plants can easily find balance due to the symmetrical nature of their branches

C. So that sunlight penetrate to the leaf’s photosynthetic tissues Back to Board

The diagram above represents the beginning and end products of a process that occurs in the nucleus of the cell. Which process does the diagram represent? A. recombination B. replication C. translation D. transcription

D. transcription Back to Board

Diagrams of a bent pinky finger and a straight pinky finger are shown above. The allele for having a bent pinky finger is dominant to the allele for having a straight pinky finger. If two people are both heterozygous for the trait of a bent finger, what is the percent probability that the child will have a straight pinky finger? A. 0 % B. 25% C. 75% D. 100%

B. 25% Back to Board

A biotic or an abiotic resource in the environment that limits the size of a population is a A. Limiting factor C. Limiting nutrient B. Carrying capacity D. Growth factor

A. Limiting factor Back to Board

A diagram of a cell is shown above. Proteins are synthesized in which organelle? A. 1 C. 2 B. 3 D. 4

B. 4 Back to Board

Which of these is a density-independent limiting factor? A. Any increase in population B. The introduction of a parasite C. An earthquake D. A decrease in predators

C. An earthquake Back to Board

A marine food web is shown above. Which of the following diagrams correctly represents an energy pyramid from this web? A. B. C. D.

D. Back to Board

When red-flowered snapdragons are crossed with white-flowered snapdragons, all of the offspring have pink flowers. When these pink-flowered snapdragons are crossed, one-fourth of the F 2 offspring will have red flowers, one-fourth will have white flowers and one-half will have pink flowers. This pattern of inheritance is most likely due to A. incomplete dominance of either the red or the white allele. B. codominance of both the red and white alleles. C. dominance of the red allele over the white allele. D. crossing over of the two alleles during meiosis.

A. density-dependent limiting factor

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