| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
Respiration is the process by which __________ absorb oxygen and eliminate carbon dioxide.
capillaries |
|
diaphragms |
|
bronchioles |
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blood cells |
The respiratory system manages respiration which is the process by which blood cells absorb oxygen and eliminate carbon dioxide.
Which of these parts of digestion takes place in the mouth?
breaking down starches |
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breaking down fats |
|
breaking down proteins |
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absorbing nutrients |
Digestion begins in the mouth where the teeth and tongue break down food mechanically through chewing and saliva, via the enzyme salivary amylase, starts to break starches down chemically. From the mouth, food travels down the esophagus where contractions push the food into the stomach.
When compared to eukaryotic cells, prokaryotic cells are:
similarly complex |
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less complex |
|
none of these |
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more complex |
Cells are classified into one of two groups based on whether or not they have a nucleus. Eukaryotic cells have a nucleus, prokaryotic cells do not have a nucleus and therefore have a less complex structure than eukaryotic cells.
What part of the brain is responsible for for balance, movement, and muscle coordination?
cerebrum |
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brainstem |
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medulla |
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cerebellum |
The cerebellum is a large cluster of nerves at the base of the brain that's responsible for balance, movement, and muscle coordination.
Which of the following would be found on a reflecting telescope?
concave mirror |
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convex mirror |
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convex lens |
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concave lens |
A concave (or converging) mirror bulges inward and focuses reflected light on the mirror's focal point where the mirror's angles of incidence converge. In contrast, a convex (or diverging) mirror bulges outward and diffuses the light waves that strike it. A common use of a concave mirror is in a reflecting telescope, a common use of a convex mirror is in the side view mirror of a car.