| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.42 |
| Score | 0% | 68% |
Within DNA, a variety of a particular gene is called a(n):
heterozygous |
|
allele |
|
homozygous |
|
chromosome |
The gene is the base unit of inheritance and is contained within DNA. A gene may come in several varieties (alleles) and there are a pair of alleles for every gene. If the alleles are alike, a person is homozygous for that gene. If the alleles are different, heterozygous.
Which of the following is not a terrestrial planet?
Jupiter |
|
Venus |
|
Mercury |
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Earth |
The four planets closest to the Sun (Mercury, Venus, Earth, and Mars) are called terrestrial (Earth-like) planets because, like the Earth, they're solid with inner metal cores covered by rocky surfaces.
Saturated fats can __________ LDL ("bad") cholesterol while unsaturated fats can __________ it.
decrease, stabilize |
|
stabilize, raise |
|
decrease, raise |
|
raise, decrease |
Saturated fats can raise LDL ("bad") cholesterol while unsaturated fats can decrease it.
The two heart chambers that pump blood called:
atria |
|
ventricles |
|
aorta |
|
valves |
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.
The envelope of gases surrounding the planet is called the:
atmosphere |
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hydrosphere |
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geosphere |
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lithosphere |
The biosphere is the global ecological system integrating all living beings and their relationships. This includes their interactions with the lithosphere (the rigid outer part of the earth, consisting of the crust and upper mantle), hydrosphere (all surface water), and atmosphere (the envelope of gases surrounding the planet).