| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.33 |
| Score | 0% | 67% |
In cell biology, where does DNA replication take place?
mitochondria |
|
nucleus |
|
Golgi apparatus |
|
cytoplasm |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.
An element in the physical state of __________ maintains a constant volume but their shape depends upon the shape of their container.
gas |
|
liquid |
|
plasma |
|
solid |
In the liquid state, molecules flow freely around each other and exist at a higher temperature range than the same substance in a solid state. Liquids maintain a constant volume but their shape depends upon the shape of their container.
What part of the food chain serves only as food for other organisms?
producers |
|
primary consumers |
|
secondary consumers |
|
decomposers |
Producers (autotrophs) serve as a food source for other organisms. Typical producers are plants that can make their own food through photosynthesis and certain bacteria that are capable of converting inorganic substances into food through chemosynthesis
Which of the following describes the Earth's mantle?
liquid |
|
primarily solid |
|
solid |
|
primarily liquid |
Mantle makes up 84% of the Earth's volume and has an average thickness of approximately 1,800 miles (2,900 km). It is dense, hot, and primarily solid although in places it behaves more like a viscous fluid as the plates of the upper mantle and crust gradually "float" along its circumference.
The asteroids in the Kuiper belt are composed of which of the following?
frozen methane, ammonia, and water |
|
minerals |
|
gaseous methane, ammonia, and water |
|
rock |
The Kuiper Belt is similar to the asteroid belt but much larger. Extending beyond the orbit of Neptune, it contains objects composed mostly of frozen methane, ammonia, and water. Most notably, the Kuiper Belt is home to Pluto, a dwarf planet that, until a 2006 reclassification, was considered the ninth planet of the solar system.