| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.16 |
| Score | 0% | 63% |
When two air masses meet and neither is displaced, what kind of front is present?
occluded |
|
stationary |
|
cold |
|
warm |
When two air masses meet and neither is displaced, a stationary front is created. Stationary fronts often cause persistent cloudy wet weather.
Which of these is matter than cannot be separated into different types of matter by ordinary chemical methods?
element |
|
compound |
|
molecule |
|
atom |
An element is matter than cannot be separated into different types of matter by ordinary chemical methods.
Within DNA, a variety of a particular gene is called a(n):
heterozygous |
|
homozygous |
|
allele |
|
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 blood component fights infection?
red blood cells |
|
white blood cells |
|
platelets |
|
plasma |
Blood is created in bone marrow and is made up of cells suspended in liquid plasma. Red blood cells carry oxygen, white blood cells fight infection, and platelets are cell fragments that allow blood to clot.
Which of these does not contain oxygenated blood?
pulmonary vein |
|
right atrium |
|
aorta |
|
left ventricle |
To provide oxygen to the body, blood flows through the heart in a path formed by the right atrium → right ventricle → lungs → left atrium → left ventricle → body. When blood enters the right side of the heart it is deoxygenated. It enters the left side of the heart oxygenated after traveling to the lungs.