| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.19 |
| Score | 0% | 64% |
Blood pressure is generally highest in which of the following?
arteries |
|
veins |
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capillaries |
|
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.
Plant cells are surrounded by:
only a cell membrane |
|
a cell membrane and a cell wall |
|
neither a cell membrane nor a cell wall |
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only a cell wall |
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.
This skeletal system is common in arthropods like insects, spiders, and crustaceans.
bone |
|
vertebrate |
|
exoskeleton |
|
endoskeleton |
An exoskeleton (external skeleton) is common in arthropods like insects, spiders, and crustaceans.
Which of the following substances gives up positively charged hydrogen ions (H+) when dissolved in water?
acid |
|
alkaline |
|
solution |
|
base |
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.
In cell biology, what part of the cell contains organelles?
nucleus |
|
cell membrane |
|
cytoplasm |
|
cell wall |
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles.