| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.93 |
| Score | 0% | 59% |
Meteoroids, meteors and meteorites are categorized based on which of the following?
their location |
|
their temperature |
|
their size |
|
their density |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
In cell biology, where does DNA replication take place?
nucleus |
|
Golgi apparatus |
|
cytoplasm |
|
mitochondria |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.
Which of these digestive enzymes is not produced by the pancreas?
lipase |
|
trypsin |
|
pancreatic amylase |
|
gastric acid |
The acids produced by the pancreas contain several enzymes that aid in digestion. Lipase converts fat to glycerol and fatty acids. Pancreatic amylase breaks down complex carbohydrates into simple sugars. Trypsin converts polypeptides (the building blocks of protein) into amino acids.
When two air masses meet and neither is displaced, what kind of front is present?
stationary |
|
warm |
|
cold |
|
occluded |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.
Which of the following describes the Earth's outer core?
solid |
|
liquid |
|
makes up most of the Earth's volume |
|
primarily solid |
The Earth's core is divided into the liquid outer core (1,430 miles or 2,300 km radius) and the solid inner core (745 miles or 1,200 km radius).