| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.00 |
| Score | 0% | 60% |
The rows of the Periodic Table of the Elements are called:
groups |
|
periods |
|
shells |
|
families |
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.
Which of these is not a phase in cell division?
anaphase |
|
cytokinesis |
|
interphase |
|
megaphase |
Cell division is the process by which cells replicate genetic material in the nucleus and consists of several phases, beginning with interphase and ending with cytokinesis.
Which of the following is the primary difference between a comet and an asteroid?
asteroids have a coma |
|
asteroids contain frozen water |
|
comets orbit the Sun |
|
comets have an atmosphere |
A comet is a loose collection of ice, dust, and small rocky particles that, in contrast to an asteroid, has an extended atmosphere surrounding the center. When passing close to the Sun, this atmosphere warms and begins to release gases forming a visible coma or tail.
Generally, an atom has __________ negative electrons orbiting the nucleus as it does positive protons inside.
more |
|
equal numbers of |
|
fewer |
|
double the number of |
An electron is a subatomic particle that orbits the nucleus of an atom. It carries a negative electric charge. Generally, an atom has the same number of negative electrons orbiting the nucleus as it does positive protons inside.
Reproductive haploids are also known as:
sperm |
|
gametes |
|
ovum |
|
diploids |
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.