| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.29 |
| Score | 0% | 66% |
In cell biology, where does DNA replication take place?
nucleus |
|
cytoplasm |
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Golgi apparatus |
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mitochondria |
The cell nucleus contains the genetic material of the cell and is where DNA replication takes place.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
endoskeleton |
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exoskeleton |
|
vertebrate |
|
bone |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
Blood pressure is generally highest in which of the following?
capillaries |
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arteries |
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veins |
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heart |
Arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood.
Which of the following would be used in eye glasses to correct farsightedness?
convex mirror |
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concave lens |
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convex lens |
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concave mirror |
Unlike curved mirrors that operate on the principle of reflection, lenses utilize refraction. A convex lens is thicker in the middle than on the edges and converges light while a concave lens is thicker on the edges than in the middle and diffuses light. A common use for curved lenses is in eye glasses where a convex lens is used to correct farsightedness and a concave lens is used to correct nearsightedness.
In which type of compound are electrons shared between atoms?
covalent |
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ionic |
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molecular |
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chemical |
A compound is a substance containing two or more different chemical elements bound together by a chemical bond. In covalent compounds, electrons are shared between atoms. In ionic compounds, one atom borrows an electron from another atom resulting in two ions (electrically charged atoms) of opposite polarities that then become bonded electrostatically.