| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.97 |
| Score | 0% | 59% |
When compared to eukaryotic cells, prokaryotic cells are:
none of these |
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less complex |
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similarly complex |
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more complex |
Cells are classified into one of two groups based on whether or not they have a nucleus. Eukaryotic cells have a nucleus, prokaryotic cells do not have a nucleus and therefore have a less complex structure than eukaryotic cells.
Which of the following is the correct order for types of radiation from longest to shortest wavelength?
microwaves → radio waves → visible light |
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visible light → ultraviolet light → radio waves |
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radio waves → visible light → gamma rays |
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infrared waves → microwaves → ultraviolet light |
The electromagnetic spectrum covers all possible wavelengths and frequencies of radiation. From lowest frequency (longest wavelength) to highest frequency (shortest wavelength) radiation: radio waves → microwaves → infrared waves → visible light → ultraviolet light → X-rays → gamma rays.
Which of the following is the primary difference between a comet and an asteroid?
comets have an atmosphere |
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comets orbit the Sun |
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asteroids contain frozen water |
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asteroids have a coma |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.
Which of the following is the smallest component of an element that still retains the properties of the element?
molecule |
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neutron |
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atom |
|
element |
An atom is the smallest component of an element that still retains the properties of the element.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
products |
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results |
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side effects |
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reactants |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).