Concept explainers
Introduction: Aquaporins or water channels are the proteins that help in the movement of water across the membrane. They are integral membrane proteins that form pores in the membrane to allow the transfer of water and sometimes small solutes.
![Check Mark](/static/check-mark.png)
Answer to Problem 1TY
Correct answer: Aquaporins are the protein channels that allow the transfer of water across the plasma membrane. Hence, the correct answer is option c.
Explanation of Solution
Reason for correct answer:
Aquaporins are a part of major intrinsic proteins that result in the pore formation. This allow the exchange of water molecules, and in some cases, small solute particles across the plasma membrane.
Option c. is given as “a protein channel in plasma membranes that facilitates the diffusion of water”.
The intrinsic proteins that cause the exchange of water molecules across the membrane are called aquaporins. Hence, the correct answer is option c.
Reasons for the incorrect answer:
Option a. is given as, “a channel protein that allows the influx of K+ into cells, causing water to flow in between the phospholipids of the plasma membrane”.
The aquaporins only allow the transfer of water molecules from extracellular fluid to the cytoplasm and not ions. Hence, option a. is incorrect.
Option b. is given as, “a type of blue-colored pore in the epidermal surfaces of plants”.
The aquaporins are not blue colored and are present in the plasma membrane of the cells for the transport of water. Hence, option b. is incorrect.
Option d. is given as, “a transport protein, or transporter, in plasma membranes that use protons to co-transport water”.
Aquaporins are the primary channels for the transport of water, some small neutral solutes and carbon dioxide through the plant cell membrane. They transfer the water molecules based on the concentration gradient. Hence, option d. is incorrect.
Option e. is given as, “none of the above”.
The aquaporins serve as protein channels that are hydrophobic and allow the transfer of water molecules. Hence, option e. is incorrect.
Hence, the options a., b., d., and e. are incorrect.
Aquaporins are present on the plasma membrane of the plant, animal, and bacterial cells. These protein channels serve as the key transport route for the water molecules. They are hydrophobic and can also transfer some neutral solutes and carbon dioxide across the plasma membrane.
Want to see more full solutions like this?
Chapter 39 Solutions
BIOLOGY
- 18. Watch this short youtube video about SARS CoV-2 replication. SARS-CoV-2 Life Cycle (Summer 2020) - YouTube.19. What is the name of the receptor that SARS CoV-2 uses to enter cells? Which human cells express this receptor? 20. Name a few of the proteins that the SARS CoV-2 mRNA codes for. 21. What is the role of the golgi apparatus related to SARS CoV-2arrow_forwardState the five functions of Globular Proteins, and give an example of a protein for each function.arrow_forwardDiagram of check cell under low power and high powerarrow_forward
- a couple in which the father has the a blood type and the mother has the o blood type produce an offspring with the o blood type, how does this happen? how could two functionally O parents produce an offspring that has the a blood type?arrow_forwardWhat is the opening indicated by the pointer? (leaf x.s.) stomate guard cell lenticel intercellular space none of thesearrow_forwardIdentify the indicated tissue? (stem x.s.) parenchyma collenchyma sclerenchyma ○ xylem ○ phloem none of thesearrow_forward
- Where did this structure originate from? (Salix branch root) epidermis cortex endodermis pericycle vascular cylinderarrow_forwardIdentify the indicated tissue. (Tilia stem x.s.) parenchyma collenchyma sclerenchyma xylem phloem none of thesearrow_forwardIdentify the indicated structure. (Cucurbita stem l.s.) pit lenticel stomate tendril none of thesearrow_forward
- Identify the specific cell? (Zebrina leaf peel) vessel element sieve element companion cell tracheid guard cell subsidiary cell none of thesearrow_forwardWhat type of cells flank the opening on either side? (leaf x.s.) vessel elements sieve elements companion cells tracheids guard cells none of thesearrow_forwardWhat specific cell is indicated. (Cucurbita stem I.s.) vessel element sieve element O companion cell tracheid guard cell none of thesearrow_forward
- Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax CollegeBiology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
- Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning
![Text book image](https://www.bartleby.com/isbn_cover_images/9781938168116/9781938168116_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781305967359/9781305967359_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781337392938/9781337392938_smallCoverImage.gif)
![Text book image](https://www.bartleby.com/isbn_cover_images/9781305389892/9781305389892_smallCoverImage.gif)