Biology Review (Week 5)

Being able to maintain stable internal systems is called ___.

• homeostasis

• metabolism

• excretion

• sustenance

What type of feedback does the body use to maintainain heart rate, blood glucose, and blood pressure?

• Positive feedback
• Negative feedback
• Neutral feedback
• No feedback

Which of these would cause your heart rate to increase?

• increased oxygen in the blood

• Increased carbon dioxide in the blood

• Increased nitrogen in the blood

• Increased hydrogen levels in the blood

Which of these is NOT a way that natural waterways help humans to survive?

• carry diseases that require new medications

• draw herds of animals which can help with hunting

• allow transportation of goods and food

• encourage immigration of people to new areas

Overall, atmospheric carbon dioxide levels are increasing. But during a given year, they decrease in the spring and increase in the fall. What might account for that seasonal change in CO2 levels?

• people are more active in spring and less active in fall

• plants grow in the spring and die in the fall

• tourism is higher in the spring then the fall

• natural disasters are more common in the spring than the fall

Tissues in the body work together to form ___.

• organelles

• organs

• organic structures

• organ systems

A student noticed that placing wilted lettuce in a bowl of cool water caused the lettuce to become more crisp and firm. What is the best explanation for his observation?

• Water moved into the lettuce cells by active transport.
• Water moved into the lettuce cells by osmosis.
• Salt moved into the lettuce cells by diffusion.
• Water moved out of the lettuce cells by osmosis.

If a cell containing 5% salt is placed into a glass of water with 20% salt, the solution is _______ compared to the cell.

• hypertonic

• hypotonic

• isotonic

• neotonic

If an animal cell containing 5% salt is placed into a glass of water with 20% salt. The cell is going to __.

• take in water

• lose water

• lose salt

• gain salt

Which of these organelles is found in plant cells, but not in animal cells?

• cell membrane

• nucleus containing DNA

• mitochondria

• large vacuole