| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.05 |
| Score | 0% | 61% |
Plant cells are surrounded by:
only a cell wall |
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a cell membrane and a cell wall |
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neither a cell membrane nor a cell wall |
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only a cell membrane |
Animal cells are surrounded by a semipermeable membrane which allows for the transfer of water and oxygen to and from the cell. In plant cells, the cell membrane is surrounded by a somewhat rigid cell wall which provides the cell structure and support.
In cell biology, where does DNA replication take place?
nucleus |
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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.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
base |
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acid |
|
solution |
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alkaline |
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.
Neurons are part of the __________ nervous system.
autonomic |
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somatic |
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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.
A subatomic particle found in the nucleus of an atom. It carries no electric charge. This desribes which of the following?
electron |
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neutron |
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proton |
|
atom |
A neutron is a subatomic particle found in the nucleus of an atom. It is neutral as it carries no electric charge.