| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.03 |
| Score | 0% | 61% |
In fermentation, what replaces oxygen in anaerobic respiration?
lactic acid or alcohol |
|
ascorbic acid or peptides |
|
starches |
|
water |
If no oxygen is present, cellular respiration is anaerobic and will result in fermentation where either lactic acid or alcohol is used instead of oxygen.
Which of the following would be used in eye glasses to correct nearsightedness?
concave lens |
|
convex lens |
|
convex mirror |
|
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.
Convert -20C° to F°.
78 |
|
-4 |
|
-36 |
|
36 |
To convert from C° to F° use:
\(F° = {9 \over 5}C° + 32\)
\(F° = {9 \over 5}(-20) + 32\)
\(F° = {-180 \over 5} + 32\)
\(F° = -36 + 32 = -4\)
Water freezing or boiling is an example of which of the following?
sublimation |
|
phase transition |
|
heating |
|
cooling |
A substance undergoes a phase transition when it moves from one state of matter to another, for example, when water freezes or boils.
Elements that belong to the same period in the Periodic Table of the Elements have the same number of:
protons |
|
electrons |
|
electron shells |
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atomic mass units |
The rows of the Periodic Table are called periods and contain elements that have the same number of electron shells ordered from lower to higher atomic number.