| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.23 |
| Score | 0% | 65% |
In a eukaryotic cell, which organelles deal with proteins?
endoplasmic reticulum |
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ribosomes |
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Golgi apparatus |
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all of these deal with proteins |
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles. Ribosomes produce proteins, endoplasmic reticulum helps synthesize proteins and fats, and Golgi apparatus prepares proteins for use.
The gravitational interaction of Earth and the Moon is responsible for which of these?
tides |
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seasons |
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the northern lights |
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day and night cycle |
Tides are caused by the gravitational interaction of Earth and the Moon.
The coldest point in the Earth's atmosphere is reached in which atmospheric layer?
troposphere |
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stratosphere |
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thermosphere |
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mesosphere |
In the mesosphere, temperature again drops as altitude increases until the coldest point in the Earth's atmosphere, the mesopause, is reached where temperatures fall to −225 °F (−143 °C).
As a cold front moves into an area, the heavier cool air __________ the lighter warm air that it is replacing.
cancels out |
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pushes above |
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pushes under |
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mixes with |
A cold front is a warm-cold air boundary with the colder air replacing the warmer. As a cold front moves into an area, the heavier cool air pushes under the lighter warm air that it is replacing. The warm air becomes cooler as it rises and, if the rising air is humid enough, the water vapor it contains will condense into clouds and precipitation may fall.
The energy posessed by a ball on the window ledge of a tall building is an example of what kind of energy?
gravitational |
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inherent |
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potential |
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kinetic |
Kinetic energy is the energy posessed by a moving object. Potential energy is stored energy in a stationary object based on its location, position, shape, or state.