| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 2.92 |
| Score | 0% | 58% |
Within DNA, a variety of a particular gene is called a(n):
heterozygous |
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chromosome |
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homozygous |
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allele |
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.
During digestion, after proteins are broken down where does the undigested food go next?
stomach |
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esophagus |
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small intestine |
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large intestine |
Food is mixed with gastric acid and pepsin in the stomach to help break down protein.
The two heart chambers that collect blood are called:
ventricles |
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atria |
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aorta |
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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.
All surface water is part of the:
atmosphere |
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hydrosphere |
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lithosphere |
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geosphere |
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).
Reproductive haploids are also known as:
diploids |
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sperm |
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gametes |
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ovum |
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.