Podcast
Questions and Answers
What is the main function of contractile vacuoles in protists?
What is the main function of contractile vacuoles in protists?
- To regulate the internal water balance of the cell (correct)
- To produce energy for the cell
- To break down waste products in the cell
- To store food for the cell
How do amoebas use contractile vacuoles to expel waste and excess water?
How do amoebas use contractile vacuoles to expel waste and excess water?
- They use cilia to push the water out of the cell
- They convert the excess water into a solid waste product that is excreted
- They have specialized pores that allow the water to passively diffuse out
- They merge the contractile vacuole with the cell membrane to release the water (correct)
Why do most multicellular organisms lack contractile vacuoles?
Why do most multicellular organisms lack contractile vacuoles?
- Multicellular organisms have more complex osmoregulatory mechanisms (correct)
- Contractile vacuoles are only found in unicellular organisms
- Contractile vacuoles are too inefficient for larger organisms
- Multicellular organisms have no need to regulate water balance
How do the contractile vacuoles in paramecium differ from those in amoeba?
How do the contractile vacuoles in paramecium differ from those in amoeba?
Which of the following is true about the role of contractile vacuoles in fungi?
Which of the following is true about the role of contractile vacuoles in fungi?
What is the primary purpose of the protonephridia system in planaria (flatworms)?
What is the primary purpose of the protonephridia system in planaria (flatworms)?
Which process is primarily responsible for moving Na+ and K+ into the lumen of Malpighian tubules?
Which process is primarily responsible for moving Na+ and K+ into the lumen of Malpighian tubules?
What is the primary role of the Malpighian tubules in insect osmoregulation?
What is the primary role of the Malpighian tubules in insect osmoregulation?
How is water moved into the lumen of the Malpighian tubules?
How is water moved into the lumen of the Malpighian tubules?
What is the advantage of excreting uric acid instead of other nitrogenous wastes?
What is the advantage of excreting uric acid instead of other nitrogenous wastes?
What is the main difference between osmoconformers and osmoregulators?
What is the main difference between osmoconformers and osmoregulators?
Which process is responsible for reabsorbing essential ions from the Malpighian tubule fluid back into the hemolymph?
Which process is responsible for reabsorbing essential ions from the Malpighian tubule fluid back into the hemolymph?
Which of the following processes occurs in the proximal tubule?
Which of the following processes occurs in the proximal tubule?
What is the primary function of aquaporins in the descending loop of Henle?
What is the primary function of aquaporins in the descending loop of Henle?
For water to move out of the descending loop of Henle by osmosis, what condition must be met?
For water to move out of the descending loop of Henle by osmosis, what condition must be met?
Which of the following substances are actively transported from the peritubular capillaries into the proximal tubule?
Which of the following substances are actively transported from the peritubular capillaries into the proximal tubule?
What is the primary mechanism by which water is reabsorbed from the proximal tubule?
What is the primary mechanism by which water is reabsorbed from the proximal tubule?
Which of the following statements is true about the processes in the proximal tubule and descending loop of Henle?
Which of the following statements is true about the processes in the proximal tubule and descending loop of Henle?
