| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.62 |
| Score | 0% | 72% |
DNA is encoded through a combination of which of the following?
gametes |
|
helix |
|
genes |
|
nucleotides |
Deoxyribonucleic acid (DNA) is the molecule that contains genetic information. DNA is encoded through a combination of nucleotides that bind together in a specific double helix pattern.
Which of these layers is found directly below the Earth's crust?
mantle |
|
outer core |
|
continents |
|
inner core |
The crust is the Earth's outermost layer and is divided into oceanic and continental types. Oceanic crust is 3 miles (5 km) to 6 miles (10 km) thick and is composed primarily of denser rock. Continental crust is 20 to 30 miles (30 to 50 km) thick and composed primarily of less dense rock. The crust makes up approximately one percent of the Earth's total volume.
The hottest of Earth's atmospheric layers is which of the following?
troposphere |
|
thermosphere |
|
stratosphere |
|
mesosphere |
Temperatures again increase with altitude in the thermosphere which is the hottest (4,530 °F / 2,500 °C) atmospheric layer due to direct exposure to the Sun's radiation. However, the gas in this layer is highly diluted so even though the atoms of gas may be very high in temperature, there are too few of them to effectively transfer much heat.
Which of the following states of matter exists at the highest temperature?
solid |
|
liquid |
|
none of these |
|
gas |
Solids exist at a lower temperature than liquids which exist at a lower temperature than gases.
Carbohydrates are found in:
vegetable oils |
|
animal sources |
|
sugars and starches |
|
food additives |
Carbohydrates are major sources of energy for the body and are found in sugars (fruit, cane sugar, beets) and starches (bread, rice, potatoes, pasta).