| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.18 |
| Score | 0% | 64% |
In the Periodic Table of the Elements, atomic number is equal to which of the following?
number of neutrons in the nucleus |
|
number of electrons orbiting the nucleus |
|
number of protons in the nucleus |
|
number of protons + neutrons in the nucleus |
The Periodic Table of the Elements categorizes elements primarily by the number of protons in their nucleus (atomic number) and secondarily by the characteristics they exhibit.
Which of the following describes the Earth's mantle?
all of these |
|
hot |
|
makes up most of Earth's volume |
|
dense |
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.
Which of the following does not represent the freezing point of water?
0°F |
|
273K |
|
0°C |
|
32°F |
The Fahrenheit scale fixes the freezing point of water at 32°F, the Celsuis scale at 0°C, and the Kelvin scale at 273K.
"For every action, there is an equal and opposite reaction." This describes which of Newton's laws of motion?
first |
|
second |
|
third |
|
fourth |
Newton's third law of motion states that For every action, there is an equal and opposite reaction. When an object exerts a force on another object, the second object exerts a force of equal magnitude in the opposite direction on the first object.
Within DNA, a variety of a particular gene is called a(n):
chromosome |
|
heterozygous |
|
homozygous |
|
allele |
The gene is the base unit of inheritance and is contained within DNA. A gene may come in several varieties (alleles) and there are a pair of alleles for every gene. If the alleles are alike, a person is homozygous for that gene. If the alleles are different, heterozygous.