Cell Structure and Tonicity Quiz

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In which environment would you expect a protist's contractile vacuole to be most active?

Neutral environment

Hypotonic environment

Hypertonic environment (correct)

Isotonic environment

Why do protists with cell walls not have contractile vacuoles?

Cell walls actively pump out excess water, bypassing the need for vacuoles

Cell walls provide structural support, eliminating the need for vacuoles

Cell walls maintain osmotic balance, making vacuoles redundant

Cell walls prevent water from entering, reducing the need for vacuoles (correct)

If a plant cell changes the osmolarity of its central vacuole, lowering its water potential, what will happen to the vacuole?

Gain water (correct)

Explode

Maintain water level

Lose water

How would a cell lower its water potential?

Increase solute concentration Signup and view all the answers

Why would a cell want to lower the water potential of its vacuole?

To maintain turgor pressure and structural integrity Signup and view all the answers

Which of these beakers has the lowest solute potential?

1 molar solution of NaCl Signup and view all the answers

In which direction does water move by osmosis?

From areas of high water potential to low water potential Signup and view all the answers

What effect does a hypertonic solution have on a red blood cell?

It causes the cell to shrink Signup and view all the answers

Where does water move in a hypotonic solution in relation to a cell's internal environment?

Into the cell Signup and view all the answers

Which cellular organelle in plant cells is involved in maintaining turgor pressure and regulating water content?

Central vacuole Signup and view all the answers

What happens to a red blood cell placed in an isotonic solution?

It remains the same Signup and view all the answers

How does a hypotonic external environment compare to a cell's internal environment in terms of water potential?

The hypotonic environment has higher water potential than the cell's internal environment Signup and view all the answers

Which organelles in a plant cell are believed to have once been free-living prokaryotes?

Mitochondria and chloroplasts Signup and view all the answers

What is the main process by which mitochondria and chloroplasts would have lived on their own?

Photosynthesis Signup and view all the answers

What is the relationship between endosymbiotic organelles and their free-living ancestral counterparts?

Endosymbiotic organelles originated from free-living prokaryotic cells. Signup and view all the answers

Which of the following is NOT a piece of evidence that supports the Endosymbiotic theory?

Absence of ribosomes in mitochondria and chloroplasts Signup and view all the answers

What do mitochondria primarily provide to the cell?

Energy in the form of ATP Signup and view all the answers

Which cellular process involves the movement of water across cell membranes to maintain cell volume?

Osmosis Signup and view all the answers