| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.34 |
| Score | 0% | 67% |
Which of the following is the primary difference between a comet and an asteroid?
comets have an atmosphere |
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asteroids contain frozen water |
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comets orbit the Sun |
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asteroids have a coma |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.
Food is mixed with gastric acid and pepsin in the __________ to help break down protein.
small intestine |
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mouth |
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large intestine |
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stomach |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
Elements in the Periodic Table of the Elements are ordered by which of the following?
atomic mass |
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atomic weight |
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atomic number |
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number of electron shells |
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.
Within DNA, a variety of a particular gene is called a(n):
chromosome |
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heterozygous |
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allele |
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homozygous |
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.
The brain and spinal cord make up the __________ nervous system.
central |
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somatic |
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peripheral |
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autonomic |
The nervous system consists of the brain and spinal cord (central nervous system) and the peripheral nervous system which is the network of nerve cells (neurons) that collect and distribute signals from the central nervous system throughout the body.