| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.51 |
| Score | 0% | 70% |
What part of the brain is responsible for for balance, movement, and muscle coordination?
brainstem |
|
cerebrum |
|
cerebellum |
|
medulla |
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 is not true of light waves?
are electromagnetic waves |
|
travel faster than sound waves |
|
are mechanical 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.
Gametes have how many pairs of chromosomes?
4 |
|
46 |
|
2 |
|
23 |
Reproductive (haploid) cells known as gametes have half as many (23) pairs of chromosomes as normal (diploid) cells. When the male gamete (sperm) combines with the female gamete (ovum) through meiosis to form a zygote, each gamete supplies half the chromosomes needed to form the normal diploid cells.
In the metric system, what prefix represents 103?
centi |
|
milli |
|
mega |
|
kilo |
Kilo is the metric system prefix for 103.
The rate of vibration of sound is called:
period |
|
volume |
|
frequency |
|
amplitude |
The rate of vibration of sound is called frequency and is measured in hertz (Hz). One hertz is one repetition per second and sounds with high frequency have a higher pitch than sounds with lower frequency. Humans can hear sounds in the range of 20 Hz to 20 kHz.