| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.30 |
| Score | 0% | 66% |
Elements in the Periodic Table of the Elements are ordered by which of the following?
atomic number |
|
atomic mass |
|
atomic weight |
|
number of electron shells |
The Periodic Table of the Elements categorizes elements primarily by the number of protons in their nucleus (atomic number) and secondarily by the characteristics they exhibit.
In the food chain, omnivores may be which of the following?
primary or secondary consumers |
|
secondary or tertiary consumers |
|
primary or tertiary consumers |
|
secondary consumers or scavengers |
Secondary or tertiary consumers may be omnivores.
A human heart consists of how many chambers?
4 |
|
2 |
|
8 |
|
1 |
The heart is the organ that drives the circulatory system. In humans, it consists of four chambers with two that collect blood called atria and two that pump blood called ventricles. The heart's valves prevent blood pumped out of the ventricles from flowing back into the heart.
Reproductive haploids are also known as:
diploids |
|
sperm |
|
ovum |
|
gametes |
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.
Which of the following indicates the correct reproductive sequence?
ovum → fetus → zygote |
|
zygote → ovum → fetus |
|
none of these are correct |
|
ovum → zygote → fetus |
During intercourse, the penis ejaculates sperm, produced in the testes, into the vagina. Some of the sperm makes their way to the uterus where, if they encounter an egg to fertilize, unite with the ovum to form a fertilized egg or zygote. The zygote then may implant in the uterus and eventually develop into a fetus.