| Your Results | Global Average | |
|---|---|---|
| Questions | 5 | 5 |
| Correct | 0 | 3.47 |
| Score | 0% | 69% |
Which of the following is the narrowest classification of life?
species |
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family |
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genus |
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domain |
The narrowest classification of life, species, contains organisms that are so similar that they can only reproduce with others of the same species.
Materials like metals that transfer heat efficiently are called:
refractors |
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reflectors |
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conductors |
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insulators |
Heat is always transferred from warmer to cooler environments and conduction is the simplest way this transfer can occur. It is accomplished through direct contact between materials and materials like metals that transfer heat efficiently are called conductors while those that conduct heat poorly, such as plastic, are called insulators.
In the heart, the __________ artery and vein manage blood flow to the lungs.
pulmonary |
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atrial |
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aorta |
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capillary |
The two largest veins in the body, the venae cavae, pass blood to the right ventricle which pumps the blood to the lungs through the pulmonary artery. Blood picks up oxygen in the lungs and returns it to the left atrium via the pulmonary vein.
The pitch of the siren of an approaching ambulance changes as it approaches you. This is an example of which of the following?
reflection |
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sound radiation |
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refraction |
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Doppler effect |
The Doppler effect occurs when the source or listener (or both) of sound waves is moving. If they're moving closer together, the listener perceives the sound with a higher pitch and, when they're moving apart, the listener perceives the sound with a lower pitch.
In cell biology, what part of the cell contains organelles?
cell membrane |
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cytoplasm |
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cell wall |
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nucleus |
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles.