Ch. 3 The Cell

Amerman - Human Anatomy & Physiology 2nd Edition

Amerman2nd EditionHuman Anatomy & PhysiologyISBN: 9780136873822Not the one you use?Change textbook

Amerman 2nd Edition

Ch. 3 The Cell

Problem L3.A3

Chapter 3, Problem L3.A3

A hypothetical poison prevents transcription factors from binding to the gene for tubulin proteins. What impact would this have on mitosis, and why?

Verified step by step guidance

Understand the role of tubulin proteins in mitosis: Tubulin is a key component of microtubules, which form the mitotic spindle. The spindle is essential for separating chromosomes during cell division.

Recognize the importance of transcription factors: Transcription factors are proteins that bind to specific DNA sequences to regulate the expression of genes, including those coding for tubulin proteins.

Analyze the effect of the poison: If transcription factors cannot bind to the gene for tubulin proteins, the production of tubulin will be inhibited. This means microtubules cannot form properly, disrupting the mitotic spindle assembly.

Connect the disruption to mitosis: Without a functional mitotic spindle, chromosomes cannot be accurately separated during mitosis. This would lead to errors in cell division, such as unequal distribution of genetic material or failure of the cell to divide.

Conclude the impact: The poison would effectively halt or severely impair mitosis, preventing normal cell division and potentially leading to cell death or dysfunction.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Transcription Factors

Transcription factors are proteins that bind to specific DNA sequences, regulating the transcription of genes. They play a crucial role in initiating and controlling the expression of genes, including those necessary for cell structure and function. In the context of tubulin proteins, transcription factors are essential for producing the mRNA that encodes these proteins, which are vital for forming microtubules.

Tubulin Proteins

Tubulin proteins are the building blocks of microtubules, which are part of the cytoskeleton in eukaryotic cells. They are essential for various cellular processes, including maintaining cell shape, enabling intracellular transport, and facilitating mitosis by forming the mitotic spindle. Without adequate tubulin production, the formation of microtubules would be impaired, disrupting normal cell division.

Mitosis

Mitosis is the process of cell division that results in two genetically identical daughter cells. It involves several stages, including prophase, metaphase, anaphase, and telophase, during which the chromosomes are accurately segregated into the daughter cells. The proper formation of the mitotic spindle, which relies on tubulin proteins, is critical for ensuring that chromosomes are evenly distributed, making tubulin's role in mitosis vital.

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Related Practice

Textbook Question

A patient is admitted to the hospital and given intravenous (IV) fluids. Four hours later, the patient complains that his mouth and eyes feel dry. You notice that he displays signs of dehydration, and when you check his IV, you see that he was given the wrong kind of fluids. Were these fluids likely hypotonic, isotonic, or hypertonic? Explain.

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Textbook Question

Match the following terms with the correct functions.

_____Peroxisome

_____Ribosome

_____Smooth endoplasmic reticulum

_____Mitochondrion

_____Golgi apparatus

_____Lysosome

_____Rough endoplasmic reticulum

_____Vesicle

a. Modifies and folds proteins into the correct structure

b. Modifies, packages, and sorts proteins

c. Contains digestive enzymes

d. Granular organelle that makes proteins

e. Synthesizes most of a cell's ATP

f. Contains enzymes that oxidize toxins and fatty acids

g. Membrane-enclosed structure used to transport substances through the cell

h. Detoxifies certain chemicals, makes lipids, stores calcium ions

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Textbook Question

A popular science fiction program once had an episode that featured an 'intron virus' that 'turned on' the introns in the genes, causing the synthesis of abnormal proteins. The episode may have been entertaining, but its premise had a large flaw about the nature of introns. What was the flaw?

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Textbook Question

Write a single sentence, using no more than 25 words, to summarize each of the following cellular processes:

Primary active transport

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Textbook Question

Write a single sentence, using no more than 25 words, to summarize each of the following cellular processes:

DNA synthesis

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