| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
Which of the following is the smallest component of an element that still retains the properties of the element?
neutron |
|
atom |
|
molecule |
|
element |
An atom is the smallest component of an element that still retains the properties of the element.
Which of the following substances gives up negatively charged hydroxide ions (OH-) when dissolved in water?
ion |
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hydrogen |
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base |
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acid |
An acid is a substance that gives up positively charged hydrogen ions (H+) when dissolved in water. A base (alkaline) gives up negatively charged hydroxide ions (OH-) when dissolved in water. pH is a scale that measures of how basic or acidic a solution is. Numbered from 0 to 14, solutions with a pH of 7 are neutral, less than 7 are acidic, more than 7 are alkaline.
Which of the following is a decomposer?
pine tree |
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ferret |
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mosquito |
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fungi |
Decomposers (saprotrophs) are organisms such as bacteria and fungi that break down the organic matter in the dead bodies of plants and animals into simple nutrients.
Within DNA, a variety of a particular gene is called a(n):
allele |
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homozygous |
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chromosome |
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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.
These clouds grow upward and can develop into cumulonimbus or thunderstorm clouds.
stratus clouds |
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nimbus clouds |
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cumulus clouds |
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cirrus clouds |
Cumulus clouds are large, puffy, mid-altitude clouds with a flat base and a rounded top. These clouds grow upward and can develop into a cumulonimbus or thunderstorm cloud.