| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.14 |
| Score | 0% | 63% |
Which of the following temperatures is least like the others?
0K |
|
-273°C |
|
absolute zero |
|
32°F |
Absolute zero is the coldest possible temperature in the universe. In the Kelvin scale, absolute zero is 0K and in the Celsius scale it is -273°C.
Earth's history is divided into time periods, which of these is the longest time period?
era |
|
eon |
|
age |
|
epoch |
The Earth is approximately 4.6 billion years old and its history is divided into time periods based on the events that took place and the forms of life that were dominant during those periods. The largest graduation of time is the eon and each eon is subdivided into eras, eras into periods, periods into epochs, and epochs into ages.
An endoskeleton (internal skeleton) is a charateristic of __________ animals, including humans.
arthropod |
|
spiny |
|
vertebrate |
|
sentient |
An endoskeleton (internal skeleton) is a charateristic of vertebrate animals, including humans.
Which of the following is the formula for work?
\(W = {{F}\over{d}}\) |
|
\(W = \vec{F}\vec{d}\) |
|
\(W = {\vec{F} \over \vec{d} }\) |
|
\(W = {F}{d}\) |
Work is performed on an object when an applied force causes displacement along the same vector. Measured in joules (J) or newton-meter (Nm), work is calculated by multiplying force times displacement: \(W = \vec{F}\vec{d}\)
In fermentation, what replaces oxygen in anaerobic respiration?
ascorbic acid or peptides |
|
water |
|
starches |
|
lactic acid or alcohol |
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.