/*! This file is auto-generated */ .wp-block-button__link{color:#fff;background-color:#32373c;border-radius:9999px;box-shadow:none;text-decoration:none;padding:calc(.667em + 2px) calc(1.333em + 2px);font-size:1.125em}.wp-block-file__button{background:#32373c;color:#fff;text-decoration:none} Problem 68 Mitochondria have DNA that encod... [FREE SOLUTION] | 91影视

91影视

Log out

Learning Materials

Features

Discover

Chapter 4: Problem 68

Mitochondria have DNA that encode proteins related to the structures and functions of the organelles. The replication appears to occur continuously, however, many questions about control of replication rate and segregation during mitosis are yet unanswered. Many diseases are caused by mitochondrial dysfunction. Mitophagy, as the name suggests, leads to the destruction of mitochondria. Predict whether or not cellular control mechanisms involving the regulation of mitochondrial DNA by the nucleus exist. Make use of what you know about selection and homeostasis as they apply to both the organism and to the organelle.

Short Answer

Expert verified
The nucleus likely regulates mitochondrial DNA to ensure cellular homeostasis and prevent dysfunction-related diseases.

Step by step solution

01

- Understand the concept of mitochondrial DNA

Mitochondria have their own DNA independent of the nuclear DNA. This mitochondrial DNA encodes for specific proteins related to the functions and structure of the mitochondria. Replication of mitochondrial DNA can occur continuously within the cell.
02

- Consider control mechanisms in cellular biology

Cells must regulate the replication rate and segregation of their contents during mitosis to maintain homeostasis. Examine how the cell regulates nuclear DNA replication and apply this knowledge to consider how the cell might regulate mitochondrial DNA.
03

- Evaluate selection and homeostasis principles

Selection ensures that functional and efficient organelles are favored within the cell. Homeostasis is the cell's ability to maintain internal balance. Given that mitochondria are essential for energy production, consider how failures in mitochondrial function could influence evolutionary pressures and homeostasis.
04

- Assess the need for regulation of mitochondrial DNA

Given the critical role of mitochondria, regulation mechanisms must exist to maintain mitochondrial integrity. Mitophagy, the process of destroying malfunctioning mitochondria, points to regulatory controls to ensure only healthy mitochondria persist.
05

- Predict the existence of regulatory control by the nucleus

Given the need to maintain cellular function and prevent diseases caused by mitochondrial dysfunction, predict that the nucleus does have mechanisms to regulate mitochondrial DNA. These mechanisms would help maintain selection and homeostasis within the cell.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Over 30 million students worldwide already upgrade their learning with 91影视!

Key Concepts

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

mitochondrial DNA
Mitochondrial DNA, often abbreviated as mtDNA, is unique as it is inherited maternally and exists separately from the nuclear DNA found in the nucleus. This DNA is critical because it encodes proteins important for the energy production and overall function of the mitochondria. Unlike nuclear DNA, mtDNA can replicate independently and continuously, thus constantly supporting the mitochondria's needs. This unique feature supports the cell's energy requirements and overall vitality. By understanding mtDNA, you get insight into how cells manage essential functions autonomously.
cellular homeostasis
Cellular homeostasis refers to the cell's ability to maintain a stable internal environment despite external changes. This stability is crucial for the cell's survival and efficient functioning. For instance, cells regulate the replication rate and segregation of their contents during processes such as mitosis. Homeostasis encompasses managing energy levels, balancing pH, and ensuring other cellular processes run smoothly. The cell continuously monitors internal conditions and makes adjustments as necessary. Mitochondria play a significant role in this process by generating ATP, the cell鈥檚 primary energy currency.
mitophagy
Mitophagy is the process by which cells selectively degrade and recycle damaged or dysfunctional mitochondria. This is a form of autophagy specific to mitochondria. Because mitochondria are critical for energy production, maintaining them in optimal condition is essential. When mitochondria become damaged or stressed, it can lead to cellular dysfunction. Mitophagy helps to remove these damaged mitochondria, preventing their harmful effects and supporting cellular health. This process ensures that only functional mitochondria are preserved, contributing to cellular homeostasis and efficient function.
mitosis segregation
During mitosis, which is the process of cell division, it is crucial that cellular contents, including mitochondria and their DNA, are properly segregated into the daughter cells. Proper segregation ensures that each new cell has the necessary components to function effectively. Mitochondria replicate their DNA independently of nuclear DNA, so their distribution during mitosis requires coordinated regulation. Though the exact mechanisms are not completely understood, it is believed that cellular control systems work to maintain proper segregation to ensure homeostasis and cellular health.
mitochondrial dysfunction
Mitochondrial dysfunction refers to the failure of the mitochondria to work effectively. This can arise from genetic mutations in the mitochondrial DNA, damage from oxidative stress, or other cellular stressors. Given the mitochondria's role in energy production, dysfunction can lead to numerous diseases and aging-related conditions. Cells have mechanisms, such as mitophagy, to mitigate these dysfunctions by removing the damaged mitochondria. By maintaining mitochondrial health, the cell supports its overall functionality and resilience. The nucleus likely plays a regulatory role to ensure the integrity of mitochondrial DNA and prevent dysfunction.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

The major role of the cell wall in bacteria is protecting the cell against changes in osmotic pressure, pressure caused by different solute concentrations in the environment. Bacterial cells swell, but do not burst, in low solute concentrations. What happens to bacterial cells if a compound that interferes with the synthesis of the cell wall is added to an environment with low solute concentrations? a. Bacterial cells will shrink due to the lack of cell wall material. b. Bacterial cells will shrink in size. c. Bacterial cells may burst due to the influx of water. d. Bacterial cells remain normal; they have alternative pathways to synthesize cell walls

What type of junctions prevent the movement of chemicals between two adjacent animal cells? a. desmosomes b. gap junctions c. plasmodesmata d. tight junctions

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.

What are the similarities and differences between the structures of centrioles and flagella? a. Centrioles and flagella are made of microtubules but show different arrangements. b. Centrioles are made of microtubules but flagella are made of microfilaments and both show the same arrangement. c. Centrioles and flagella are made of microfilaments. Centrioles have a 9 + 2 arrangement. d. Centrioles are made of microtubules and flagella are made of microfilaments and both have different structures

Mammalian red blood cells have no nuclei, must originate in other tissue systems, are relatively long-lived, are small with shapes that actively respond to their environment, and are metabolic anaerobes. Other vertebrates have red blood cells that are usually nucleated and are often relatively large, aerobic, self-replicating, and short-lived. To connect these facts to biology, questions need to be asked. The questions that you pose will depend on the path your class is taking through the curriculum. Begin by summarizing what you know: What are the functions of a eukaryotic cell nucleus? What is the approximate average size of a human red blood cell? What is the range of blood vessel diameters in adult humans? What is the range of red blood cell size in vertebrates? What is the average lifetime of a human red blood cell? How can you show how cell production is stimulated using examples from particular systems? How is cell death controlled? What biochemical cycles are associated with anaerobic and aerobic respiration, and what are the important differences between these? What process is involved in the transport of oxygen and carbon dioxide into and out of red blood cells? What behaviors and dynamic homeostatic processes might be associated with the properties of red blood cells in mammalian and nonmammalian organisms? What do you know about the evolutionary divergences among vertebrates? Your summary has revealed some similarities and differences among vertebrate erythrocyte and circulatory system structures. Scientific questions are testable. They can be addressed by making observations and measurements and analyzing the resulting data. A. Pose three scientific questions that arise from your summaries of what you know about erythrocytes and capillary size. B. For each question you pose, predict what you believe would be the answer and provide reasoning for your prediction. C. Describe an approach you think can be used to obtain data to test your prediction. D. In the production of mammalian red blood cells, erythrocytes that have not yet matured and are still synthesizing heme proteins are surrounded by a macrophage. Predict the role of the macrophage in the maturation of a red blood cell.
See all solutions

Recommended explanations on Biology Textbooks

Microbiology

Read Explanation

Plant Biology

Read Explanation

Astrobiological Science

Read Explanation

Ecological Levels

Read Explanation

Responding to Change

Read Explanation

Biological Molecules

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.