| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.72 |
| Score | 0% | 54% |
Which of the following is true about species groups?
a biome is a made up of a group of biospheres |
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a community is made up of a group of populations |
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a population is made up of a group of communities |
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an ecosystem is a biological population |
A population is a group of organisms of the same species who live in the same area at the same time. A community is a group of populations living and interacting with each other in an area.
Within DNA, a variety of a particular gene is called a(n):
allele |
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heterozygous |
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homozygous |
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chromosome |
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.
Small rocks shed by asteroids and comets that reach the earth are called:
meteorites |
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shooting stars |
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meteors |
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meteoroids |
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
Which of the following represents the largest value?
1 ML |
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1 cL |
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1 kL |
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1 mL |
Mega (M) is 106, kilo (k) is 103, centi (c) is 10-2, milli (m) is 10-3 so 1 ML represents the largest value.
The angle of reflection is equal to which the following?
refractive index |
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90° |
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focal point |
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angle of incidence |
The law of reflection specifies how waves, including light waves, bounce off of surfaces. Specifically, the angle of incidence of the approaching wave is equal to the angle of reflection of the reflected wave as measured from a line perpendicular (90°) to the surface.