| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.85 |
| Score | 0% | 57% |
Within DNA, a variety of a particular gene is called a(n):
chromosome |
|
allele |
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homozygous |
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heterozygous |
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.
Neurons are part of the __________ nervous system.
somatic |
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autonomic |
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peripheral |
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central |
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.
In the food chain, omnivores may be which of the following?
secondary consumers or scavengers |
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secondary or tertiary consumers |
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primary or tertiary consumers |
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primary or secondary consumers |
Secondary or tertiary consumers may be omnivores.
Materials like metals that transfer heat efficiently are called:
conductors |
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insulators |
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reflectors |
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refractors |
Heat is always transferred from warmer to cooler environments and conduction is the simplest way this transfer can occur. It is accomplished through direct contact between materials and materials like metals that transfer heat efficiently are called conductors while those that conduct heat poorly, such as plastic, are called insulators.
Earth's history is divided into time periods, which of these is the shortest time period?
age |
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epoch |
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period |
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eon |
The Earth is approximately 4.6 billion years old and its history is divided into time periods based on the events that took place and the forms of life that were dominant during those periods. The largest graduation of time is the eon and each eon is subdivided into eras, eras into periods, periods into epochs, and epochs into ages.