| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.97 |
| Score | 0% | 59% |
Which of the following is not a characteristic of the Sun?
makes up over 99% of the mass of the solar system |
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formed 2.6 billion years ago |
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is composed of hydrogen and helium |
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is a yellow dwarf star |
The Sun is a G-type main-sequence star (G2V) but is informally known as a yellow dwarf star. Composed of 73% hydrogen and 25% helium, the hot plasma that makes up the Sun reaches 9,900°F (5,505°C) at the surface. It formed approximately 4.6 billion years ago and makes up 99.86% of the mass in the solar system.
Molecules and atoms that are outputs from a chemical reaction are known as which of the following?
results |
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reactants |
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side effects |
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products |
During a chemical reaction molecules and atoms (reactants) are rearranged into new combinations that result in new kinds of atoms or molecules (products).
Which of the following is the formula for power?
\(P = w t\) |
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\(P = {w \over t}\) |
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\(P = \vec{w}t\) |
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\(P = {\vec{w} \over t}\) |
Power is the rate at which work is performed or work per unit time: \(P = {w \over t}\) and is measured in watts (W).
When compared to eukaryotic cells, prokaryotic cells are:
more complex |
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less complex |
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none of these |
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similarly 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.
In the food chain, consumers are classified as which of the following?
secondary |
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all of these |
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primary |
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tertiary |
Most animals consume other organisms to survive. Consumers (heterotrophs) are divided into three types, primary, secondary, and tertiary, based on their place in the food chain.