| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.35 |
| Score | 0% | 67% |
Gametes have how many pairs of chromosomes?
46 |
|
2 |
|
23 |
|
4 |
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.
The Earth's rocks fall into three categories based on how they're formed. Which of the following is formed by the gradual depositing of small rocks?
metamorphic |
|
sedimentary |
|
igneous |
|
granite |
The Earth's rocks fall into three categories based on how they're formed. Igneous rock (granite, basalt, obsidian) is formed from the hardening of molten rock (lava), sedimentary rock (shale, sandstone, coal) is formed by the gradual despositing and cementing of rock and other debris, and metamorphic rock (marble, slate, quartzite) which is formed when existing rock is altered though pressure, temperature, or chemical processes.
A subatomic particle found in the nucleus of an atom. It carries a positive electric charge. This desribes which of the following?
proton |
|
atom |
|
electron |
|
neutron |
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
In the food chain, omnivores may be which of the following?
secondary or tertiary consumers |
|
secondary consumers or scavengers |
|
primary or secondary consumers |
|
primary or tertiary consumers |
Secondary or tertiary consumers may be omnivores.
The dwarf planet Pluto is located where?
in the asteroid belt |
|
outside the solar system |
|
in the Kuiper Belt |
|
between the orbits of Jupiter and Saturn |
The Kuiper Belt is similar to the asteroid belt but much larger. Extending beyond the orbit of Neptune, it contains objects composed mostly of frozen methane, ammonia, and water. Most notably, the Kuiper Belt is home to Pluto, a dwarf planet that, until a 2006 reclassification, was considered the ninth planet of the solar system.