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Chapter 4: Problem 43

How does the structure of a plasmodesma differ from that of a gap junction? a. Gap junctions are essential for transportation in animal cells and plasmodesmata are essential for the movement of substances in plant cells. b. Gap junctions are found to provide attachment in animal cells and plasmodesmata are essential for attachment of plant cells. c. Plasmodesmata are essential for communication between animal cells and gap junctions are necessary for attachment of cells in plant cells. d. Plasmodesmata help in transportation and gap junctions help in attachment, in plant cells.

Short Answer

Expert verified
Option (a) is correct; gap junctions transport in animal cells, plasmodesmata move substances in plant cells.

Step by step solution

01

Identify Key Terms

Understand the definitions of plasmodesmata and gap junctions. Plasmodesmata are microscopic channels that traverse the cell walls of plant cells and enable transport and communication between them. Gap junctions are specialized intercellular connections between animal cells that allow for the direct transfer of ions, nutrients, and other molecules.
02

Compare Functions

Analyze the role of each structure in their respective types of cells. Plasmodesmata are primarily involved in communication and transportation between plant cells. Gap junctions, on the other hand, serve a similar function in animal cells by allowing for essential substance movement between adjacent cells.
03

Match Statements with Functions

Evaluate each option based on the identified roles of plasmodesmata and gap junctions. Option (a) states that gap junctions are essential for transportation in animal cells and plasmodesmata for the movement of substances in plant cells, which aligns with their functions. The other options incorrectly describe the roles or mix up the cell types where these structures occur.
04

Select the Correct Answer

Based on the comparisons and evaluations, conclude that option (a) is the correct answer as it accurately describes the functions of plasmodesmata and gap junctions in their respective types of cells.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Plasmodesmata
Plasmodesmata are tiny channels that allow communication and transport between plant cells. These microscopic channels traverse the cell walls, making it possible for plant cells to exchange ions, nutrients, and other vital molecules. Plasmodesmata ensure that plant cells can work together seamlessly.
Think of them as small tunnels between plant cells. They help the plant function as a cohesive unit, allowing the movement of essential substances and enabling plants to grow and respond to their environment.
Gap Junctions
Gap junctions play a similar role in animal cells. They are specialized intercellular connections that connect the cytoplasm of two cells, allowing for direct communication. Through these junctions, ions, nutrients, and signaling molecules can pass freely between adjacent animal cells.
Gap junctions are crucial for maintaining the health and function of tissues by ensuring that cells can communicate quickly and efficiently. These structures are essential for processes like the heartbeat, where rapid cell communication is vital.
Plant Cells
Plant cells have unique structures to meet their specific needs. One of these structures is plasmodesmata, which are necessary for the movement and communication between cells. Plant cells also have rigid cell walls that provide structural support.
Another distinctive feature of plant cells is chloroplasts, which are involved in photosynthesis. This process allows plants to convert light energy into chemical energy. Understanding these characteristics helps explain why certain structures, like plasmodesmata, are so vital for plant life.
Animal Cells
Animal cells differ from plant cells in several ways. They do not have cell walls but have flexible cell membranes. This difference makes structures like gap junctions essential for cell communication. Animal cells often need to respond quickly to their environment, and gap junctions facilitate this rapid communication.
Animal cells also have other unique organelles like lysosomes and centrioles, which are not found in plant cells. These differences underline why animal cells rely on gap junctions to maintain coordinated functions across tissues.
Cell Communication
Cell communication is fundamental to the functioning of both plant and animal cells. It involves the transfer of information between cells to maintain homeostasis and respond to environmental changes. In plant cells, plasmodesmata fulfill this role by allowing materials to move between cells.
In animal cells, gap junctions serve a similar purpose. They enable cells to share ions, nutrients, and signaling molecules directly. Effective cell communication is essential for growth, development, and functioning of all multicellular organisms.

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Most popular questions from this chapter

Louis Sullivan described architectural design as 鈥渇orm follows function.鈥� For example, a window is designed to add light to a space without heat transport. A door is designed to allow access to a space. Windows and doors have different functions and so take different forms. Biological systems are not designed, but selected from random trials by interaction with the environment. Apply Sullivan鈥檚 principle to explain the relationship of function and form for each pair of cellular structures below. a. Plasma membrane and endoplasmic reticulum b. Mitochondrion and chloroplast c. Rough endoplasmic reticulum and smooth endoplasmic reticulum d. Flagella and cilia e. Muscle cells and secretory cells

In which human tissues would you find desmosomes? Think of tissues that undergo strong mechanical stress and must be held together with some flexibility. a. bone cells and cartilage cells b. muscle cells and skin cells c. nerve cells and muscle cells d. secretory cells and muscle cells

What happens to the proteins that are synthesized on free ribosomes in the cytoplasm? Do they go through the Golgi apparatus? a. These proteins move through the Golgi apparatus and enter in the nucleus. b. These proteins go through the Golgi apparatus and remain in the cytosol. c. The proteins do not go through the Golgi apparatus and move into the nucleus for processing. d. The proteins do not go through the Golgi apparatus and remain free in the cytosol.

Which of the following is true regarding the surface-tovolume ratios of the cube and the sphere? a. The sphere will have a higher surface area than the cube. b. The sphere will have a higher volume than the cube. c. The sphere will have a higher surface area-tovolume ratio than the cube. d. Their surface area-to-volume ratios will be equal. e. The sphere will have a lower surface area-tovolume ratio than the cube.

What is a difference between prokaryotic and eukaryotic cells? a. Both cells have a nucleus but prokaryotic cells lack cytoplasm. b. Both cells have cytoplasm but prokaryotic cells lack a nucleus. c. Both cells have DNA but prokaryotic cells lack a cell membrane. d. Both cells have a cell membrane but prokaryotic cells lack DNA.
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