| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.07 |
| Score | 0% | 61% |
Which of the following is not a method of heat transfer?
conduction |
|
convection |
|
radiation |
|
reflection |
Heat is always transferred from warmer to cooler environments through conduction, convection, or radiation.
What prevents blood pumped out of the ventricles from flowing back into the heart?
platelets |
|
valves |
|
capillaries |
|
atria |
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.
DNA is encoded through a combination of which of the following?
genes |
|
helix |
|
gametes |
|
nucleotides |
Deoxyribonucleic acid (DNA) is the molecule that contains genetic information. DNA is encoded through a combination of nucleotides that bind together in a specific double helix pattern.
Blood pressure is generally highest in which of the following?
arteries |
|
veins |
|
capillaries |
|
heart |
Arteries are thick-walled because they carry oxygenated blood at high pressure, veins are comparatively thin-walled as they carry low-pressure deoxygenated blood.
The asteroids in the Kuiper belt are composed of which of the following?
frozen methane, ammonia, and water |
|
rock |
|
minerals |
|
gaseous methane, ammonia, and water |
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.