| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.90 |
| Score | 0% | 58% |
Which of the following is the smallest component of an element that still retains the properties of the element?
molecule |
|
atom |
|
element |
|
neutron |
An atom is the smallest component of an element that still retains the properties of the element.
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.
In the food chain, omnivores may be which of the following?
primary or tertiary consumers |
|
primary or secondary consumers |
|
secondary consumers or scavengers |
|
secondary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.
Sound travels fastest through which of the following media?
vacuum |
|
air |
|
water |
|
metal |
The speed of a sound wave will vary with the medium. Sound travels fastest through media that has particles that are very close together, like metal. Thus, it travels faster through water than through air and doesn't travel at all through a vacuum (there are no particles in empty space to vibrate).
Absolute zero is which of the following?
the coldest temperature possible in the universe |
|
0°C |
|
the freezing point of hydrogen |
|
the freezing point of oxygen |
In contrast to the Celsius scale (measured in degrees centigrade) that fixes 0° at the freezing point of water and the Fahrenheit scale that uses 32°, the Kelvin scale fixes 0 at absolute zero (-273°C) which is the lowest temperature possible in the universe.