GED Science

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Which of the following processes allows the cells of an organism to use carbon from the environment?

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Photosynthesis is the process by which green plants and some other organisms use sunlight to synthesize foods from carbon dioxide and water. Photosynthesis in plants generally involves the green pigment chlorophyll and generates oxygen as a byproduct.

During photosynthesis in plants, what is the source of the carbon in the sugar molecule (C6H12O6)?

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Carbon dioxide is used from the air during photosynthesis.

Change of phase is a process whereby matter changes form (solid, liquid, gas).Which one of the following constitutes a phase change? 

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Since the wax melts because the temperature of the wax is raised, once the heat source is removed, the wax will begin to lose heat, assuming that ambient temperature is low enough. Eventually, the wax will go through another phase change and become solid. So, the short answer is: burning is irreversible because it involves a chemical reaction, while melting is reversible because it's just a phase change.

Newton’s laws of motion provides that an object set in motion remains in motion unless a force acts on it. If you suspend a ball from a tree with a piece of string and make it swing, the ball will swing for a while, then slow down and stop.Why does the ball stop swinging?

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The ball in motion slows down and stops swinging because the force of friction acts on it. The kinetic energy of the object is converted to heat energy through friction with air.

Which of the following are true about gravity? Select all that apply

Please select 3 correct answers

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The gravitational force between two objects depends on the masses of both objects not just one of the objects. Both B and D imply that only one object determines the gravitational force.

Two positvely charged objects

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A positively charged object will exert a repulsive force upon a second positively charged object. This repulsive force will push the two objects apart. Similarly, a negatively charged object will exert a repulsive force upon a second negatively charged object. Objects with like charge repel each other.

The diagram above shows a geologic cross section.

Which rock layer most likely contains fossils of the oldest evolved organisms?

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With geological cross sections, the most recent organisms are on top and the oldest organisms would appear on bottom.

Which of the following structures is not found in bacteria?

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At one time it was thought that bacteria were essentially "bags of enzymes" with no inherent cellular architecture. The development of the electron microscope in the 1950s revealed the distinct anatomical features of bacteria and confirmed the suspicion that they lacked a nuclear membrane. Structurally, a bacterial cell has three architectural regions: appendages (attachments to the cell surface) in the form of flagella and pili (or fimbriae); a cell envelope consisting of a capsule, cell wall and plasma membrane; and a cytoplasmic region that contains the cell chromosome (DNA) and ribosomes and various sorts of inclusions. In this lecture, we will discuss the anatomical structures of procaryotic cells in relation to their adaptation, function and behavior in natural environments.

What always stays the same when a chemical reaction takes place?

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The number of atoms stays constant throughout a chemical reaction.

In the winter, people like to wear coats. Why is this?

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Coats provide insulation by reducing the amount of heat lost from the body.

Which of the following is NOT true?

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Animal cells usually don’t have a cell wall. Other statements are true.

The polar bear's dense fur and an exceptionally thick layer of fat under its skin protect it against the freezing temperatures of the habitat.


How is natural selection in the evolution of a thick coat of fur in polar bears best explained?
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Natural Selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring. The theory of its action was first fully expounded by Charles Darwin and is now believed to be the main process that brings about evolution. In this case, polar bears with thicker fur were able to better survive in their environment while thinner furred polar bears died off over time.

Which of the following is a source of genetic variation within a species? 

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Mutation is the changing of the structure of a gene, resulting in a variant form that may be transmitted to subsequent generations.

Rainfall in a tropical region is below average for 20 consecutive years. Animals adapted for dry conditions are much more plentiful at the end of the 20 years. Which of the following statements best explains the increase in the population of these animals?

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Natural Selection is the process whereby organisms better adapted to their environment tend to survive and produce more offspring.

Which of the following sets of organisms would be found in a wetland ecosystem? 

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A wetland is a land area that is saturated with water, either permanently or seasonally. A wetland ecosystem supports many species including, amphibians and reptiles.

Most bacteria cannot grow in high concentrations of salt. As a result,

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Salty foods are less prone to bacterial attack because most bacteria can’t grow in environments that are too salty.

There are four blood types in humans: A, B, AB, and O. An individual with blood type A has antibodies for B, so he or she can’t receive type B blood. Similarly, a person with blood type B has antibodies for type A and can’t receive type A blood. A person with AB blood type has no antibodies and can receive blood from anyone. A person with type O blood has both A and B antibodies and can receive blood only from someone else with type O blood. Based on this information, someone with type A blood can donate to

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Someone who has blood type A can donate blood to those who don’t have antibodies for A. These include other people with type A blood (they have antibodies for B only) and those with type AB blood (they don’t have any antibodies).

Which of the following levels of organization best represents the sequence from smallest unit to largest?

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All of the following are primates EXCEPT:

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Whales are not primates. Primates have five digits on each hand and foot, binocular vision and flexible shoulder joints.

Which of the following does NOT cause changes in the Earth’s surface, such as the formation of mountains and valleys?

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The ozone cannot directly change the surface of the Earth as the other options can directly change it. However, it believed that changes to the ozone could result in changes in the weather. Different weather patterns have an impact on the Earth's surface; however, of the choices available Ozone is the best answer.

Determine how much water is in the graduated cylinder by reading the bottom of the meniscus (surface of water).

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The bottom division on the zoomed in image of the graduated cylinder is 40 ml. The top division on the zoomed in image of the graduated cylinder is the 50 ml mark. There are 10 divisions between them, so each one is 1 ml. The bottom of the meniscus is at 43 ml so this is the best answer.

In flowers, the gene for red color is dominant over the gene for white color. We will specify the gene for white flowers as r, and the gene for red flowers as R. Each flower has two genes for color (one from each parent) and donates only one gene for color to its offspring. White flowers have the genotype rr. Any other genotype leads to Red flowers. 


Consider the Punnett square. The offspring of these two parents:
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An island in the Pacific Ocean was overpopulated with Anguidae lizards. Sailors came to the island and carried weasels, an animal that fed on the lizards. The population of the weasels grew immensely as there was plenty of food. No predators existed on the island that kept the weasel population in check. People began populating the island and at the same time a shortage of lizards occurred. The weasels, facing a shortage of lizards, began eating chickens that the people raised. The people realized what was happening and began protecting their chickens from getting eaten. The weasel population began to decrease. Some weasels still remain on the island, but their number is now at equilibrium, kept in check by the availability of food.

The passage illustrates:

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All the choices are correct. The balance in the ecosystem was disturbed when a new predator was introduced, choice a. When the population of mongooses increased, the population of snakes decreased, causing a drop in the population of mongooses, choice b Humans entirely changed the ecosystem when they brought the mongooses, choice c. Weasels depend on snakes for food, choice d.

An island in the Pacific Ocean was overpopulated with Anguidae lizards. Sailors came to the island and carried weasels, an animal that fed on the lizards. The population of the weasels grew immensely as there was plenty of food. No predators existed on the island that kept the weasel population in check. People began populating the island and at the same time a shortage of lizards occurred. The weasels, facing a shortage of lizards, began eating chickens that the people raised. The people realized what was happening and began protecting their chickens from getting eaten. The weasel population began to decrease. Some weasels still remain on the island, but their number is now at equilibrium, kept in check by the availability of food.

The passage illustrates:
There was a high population of weasels because:

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The paragraph explains that the population of the weasels increased because of the plentiful amount of food and the fact that no animals on the island fed on the weasels.

An island in the Pacific Ocean was overpopulated with Anguidae lizards. Sailors came to the island and carried weasels, an animal that fed on the lizards. The population of the weasels grew immensely as there was plenty of food. No predators existed on the island that kept the weasel population in check. People began populating the island and at the same time a shortage of lizards occurred. The weasels, facing a shortage of lizards, began eating chickens that the people raised. The people realized what was happening and began protecting their chickens from getting eaten. The weasel population began to decrease. Some weasels still remain on the island, but their number is now at equilibrium, kept in check by the availability of food.

The passage illustrates:
There were hardly any lizards left on the island because

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There is a lack of information to select most of the answers. The only answer that can be deduced from the passage is that the weasels ate the lizards causing the decrease in population.

Express the number 1549.3 in proper scientific notation with the correct amount of significant figures: 


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Mendel succeeded in forming the basis of modern hereditary theory in part because of his training: 

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Which of the following is NOT classified as a low-level cloud:

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About how many calories per gram will it take to sublimate water at standard pressure:

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sublimation is solid -> vapor; 80 cal + 100 cal + 540 cal = 720 cal

Which of the following is generally NOT true of the alpine versus arctic tundra biomes:

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The alpine tundra provides a more conducive environment for animals and thus the statement that it has a lower diversity of species compared to the arctic tundra is false.

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