| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.96 |
| Score | 0% | 59% |
Changes to an object's speed or direction of motion are caused by which of the following?
a force |
|
kinetic energy |
|
work |
|
power |
Force is applied to change an object's speed or direction of motion.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
compound |
|
element |
|
atom |
|
molecule |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.
Which of the following is not true of light waves?
are electromagnetic waves |
|
are mechanical waves |
|
travel faster than sound waves |
|
can travel through a vacuum |
Unlike mechanical sound waves that require a physical medium for propagation, light waves are electromagnetic and can travel through empty space. Light waves are also much faster, travelling at 186,000 m/s vs. 343 m/s for sound waves.
Cellular fermentation takes place:
anaerobically |
|
in the presence of oxygen |
|
aerobically |
|
in plant cells |
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 these digestive enzymes is not produced by the pancreas?
gastric acid |
|
trypsin |
|
lipase |
|
pancreatic amylase |
The acids produced by the pancreas contain several enzymes that aid in digestion. Lipase converts fat to glycerol and fatty acids. Pancreatic amylase breaks down complex carbohydrates into simple sugars. Trypsin converts polypeptides (the building blocks of protein) into amino acids.