| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.45 |
| Score | 0% | 69% |
In cell biology, where does DNA replication take place?
mitochondria |
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cytoplasm |
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nucleus |
|
Golgi apparatus |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.
Work is measured in:
amps |
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horsepower |
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watts |
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joules or newton-meters |
Work is performed on an object when an applied force causes displacement along the same vector. Measured in joules (J) or newton-meters (Nm), work is calculated by multiplying force times displacement: \(W = \vec{F}\vec{d}\)
Saturated fats can __________ LDL ("bad") cholesterol while unsaturated fats can __________ it.
decrease, stabilize |
|
decrease, raise |
|
raise, decrease |
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stabilize, raise |
Saturated fats can raise LDL ("bad") cholesterol while unsaturated fats can decrease it.
The transfer of heat by the circulation or movement of the heated parts of a liquid or gas is called:
convection |
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conduction |
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radiation |
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diffusion |
Convection is the transfer of heat by the circulation or movement of the heated parts of a liquid or gas. Examples of heat transfer by convection include water coming to a boil on a stove, ice melting, and steam from a cup of coffee.
The fossil record is a product of which period of Earth's history?
Cambrian |
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Cretaceous |
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Cenozoic |
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Jurassic |
The Cambrian period is one of the most significant geological time periods. Lasting about 53 million years, it marked a dramatic burst of changes in life on Earth known as the Cambrian Explosion. It is from this period that the majority of the history of life on Earth, as documented by fossils, is found. Called the fossil record, the layering of these mineralized imprints of organisms preserved in sedementary rock have allowed geologists to build a historical record of plant and animal life on Earth.