| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.09 |
| Score | 0% | 62% |
In the metric system, what prefix represents 10-3?
milli |
|
centi |
|
kilo |
|
mega |
In the metric system, milli is the prefix for 10-3.
Plant cells are surrounded by:
a cell membrane and a cell wall |
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only a cell wall |
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only a cell membrane |
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neither a cell membrane nor a cell wall |
Animal cells are surrounded by a semipermeable membrane which allows for the transfer of water and oxygen to and from the cell. In plant cells, the cell membrane is surrounded by a somewhat rigid cell wall which provides the cell structure and support.
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
neutron |
|
proton |
|
atom |
|
electron |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
The two heart chambers that collect blood are called:
valves |
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atria |
|
aorta |
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ventricles |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
An asteroid belt holds many of the asteroids in our solar system. It is located between the orbits of which planets?
Mars and Jupiter |
|
Mars and Earth |
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Mercury and Venus |
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Jupiter and Saturn |
The solar system also contains over a million rocky fragments of at least 1km in diameter called asteroids as well as millions more with smaller diameters. Many of these asteroids are an asteroid belt between the orbits of Mars and Jupiter.