Campbell Biology
12th Edition
ISBN: 9780135188743
Author: Urry
Publisher: PEARSON
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Chapter 12.2, Problem 4CC
Compare the roles of tubulin and actin during eukaryotic cell division with the roles of tubulin-like and actin-like proteins during bacterial binary fission.
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You discover a substance that prevents the motor protein in a centromere from attaching to a spindle fiber. What would be a consequence of adding this substance to a cell during mitosis?
Group of answer choices
A) the chromatin would not coil up to form condensed chromosomes
B) the nuclear membrane would not break down
C) sister chromatids would not form
D) sister chromatids would fail to separate
List and describe the three main types of cytoskeleton. If you wanted to do immunocytochemistry to specifically stain each type of cytoskeleton, what is a protein that could be used for each cytoskeletal type (in other words, what is a unique protein for each cytoskeletal type)?
What are three types of actin structures? Describe the involvement of actin structures in cell migration.
How is the growth and shrinking of microtubules regulated? Then describe the roles of microtubules in: chromosomal separation during mitosis and the movement of organelles and vesicles within a cell.
Describe a possible mechanism on how signaling pathways might impact the cytoskeleton, so that cell migration could be regulated in a localized manner within a multicellular organism. (hint: think about the possible transcriptional regulation of the G-protein regulators)
What are 2 main challenges of protein targeting? Then describe one way these challenges are overcome during signal-based targeting and one way…
The nucleus
a) has a single membrane and compartmentalizes the genetic material
b) has a double membrane joined by nuclear pores, is continuous with the endoplasmic reticulum membrane, and compartmentalizes the nuclear genetic material
c) has a double membrane joined by nuclear pores, is continuous with the smooth endoplasmic reticulum membrane only, and compartmentalizes the nuclear genetic material
d) None of these are accurate
Chapter 12 Solutions
Campbell Biology
Ch. 12.1 - How many chromosomes are drawn in each part of...Ch. 12.1 - WHAT IF? A chicken has 78 chromosomes in its...Ch. 12.2 - How many chromosomes are shown in the illustration...Ch. 12.2 - Compare cytokinesis in animal cells and plant...Ch. 12.2 - During which stages of the cell cycle does a...Ch. 12.2 - Compare the roles of tubulin and actin during...Ch. 12.2 - A kinetochore has been compared to a coupling...Ch. 12.2 - MAKE CONNECTIONS What other functions do actin...Ch. 12.3 - In Figure 12.14, why do the nuclei resulting from...Ch. 12.3 - How does MPF allow a cell to pass the G2 phase...
Ch. 12.3 - MAKE CONNECTIONS Explain how receptor tyrosine...Ch. 12 - Differentiate between these terms: chromosome,...Ch. 12 - In which of the three phases of interphase and the...Ch. 12 - Explain the significance of the G1, G2, and M...Ch. 12 - Through a microscope, you can see a cell plate...Ch. 12 - Vinblastine is a standard chemotherapeutic drug...Ch. 12 - One difference between cancer cells and normal...Ch. 12 - The decline of MPF activity at the end of mitosis...Ch. 12 - In the cells of some organisms, mitosis occurs...Ch. 12 - Which of the following does not occur during...Ch. 12 - Cell A has half as much DNA as cells B, C, and D...Ch. 12 - The drug cytochalasin B blocks the function of...Ch. 12 - VISUAL SKILLS The light micrograph shows dividing...Ch. 12 - DRAW IT Draw one eukaryotic chromosome as it would...Ch. 12 - EVOLUTION CONNECTION The result of mitosis is that...Ch. 12 - SCIENTIFIC INQUIRY Although both ends of a...Ch. 12 - WRITE ABOUT A THEME: INFORMATION The continuity of...Ch. 12 - SYNTHESIZE YOUR KNOWLEDGE For selected answers,...
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Problem Set
True or False? Indicate whether each of the following statements about membrane transport is true (...
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- In some eukaryote organisms, myocytes are a type of stem cell that become Muscle cells. These cells filled with a protein called myosin. Such cell products are stored in cell structures that are formed from: A) the nucleus, B) from the smooth ER as vesicles, C) are engulfed into the cell by phagocytosis, D) are released from the cell by the process of Exocytosis, E) the lysosomes.arrow_forwardThe nucleus is the largest of the eukaryotic organelles and contains the genome of the organism. a) describe the proteins and process of nuclear import and export. b) describe, in general terms, an experiment that could be conducted to show that there are specific signals for nuclear import or export.arrow_forwardGive the respective structural descriptions and functions of the following: 1. Cell Membrane 2. Nucleus 3. Nucleolus 4. Smooth Endoplasmic Reticulum 5. Rough Endoplasmic Reticulum 6. Nuclear Membrane 7. Mitochondria 8. Golgi Apparatus 9. Cytoskeletonarrow_forward
- 50. Cell motility involves the coordination of many events in the cell. In cells lacking flagella/cilia, which of the following are NOT required for cell motility? a) extension of actin filaments b) transmembrane proteins associating with extracellular matrix proteins in the underlying surface c) myosin-mediated contraction at the rear of the moving cell d) formation of a microtubule array in the leading edge of the cell e) formation of plasma membrane extensions such as pseudopodia or filopodiaarrow_forwardThe biological process shown in Figure 1 occurs in a eukaryotic cell’s nucleus. d) Name X and state how it functions in a protein synthesis. e) Give three differences between molecules X and Y.arrow_forwardThe cell division process that cells in culture undergo includes the following stages in temporal order: O a) Telophase, anaphase, prophase, metaphase O b) Anaphase, metaphase, prophase, telophase O c) Metaphase, prophase, telophase, anaphase O d) Prophase, metaphase, anaphase, telophasearrow_forward
- Answer the Guide Question: a) Each cell in an organism has all of the basic parts. Each has a function that benefits the other cells, how might the presence of different cell structures in plant and animal help them perform their functions as an organism. Explain. b) Why is the cell membrane considered as the guard of the cell? c) Why is the lysosome considered as the suicide bag of the cell?arrow_forwardWhich is true of Prokaryote cells? A) Because their DNA exists in a nucleoid area, the synthesis of proteins depends on random interactions between mRNA and rRNA, B) They contain membrane-bounded compartments or organelles. C) A true nucleus contains the DNA in the form of chromosomes D) Some contain mitochondria E) They contain many organelles in the cytoplasmarrow_forwardThe endosymbiotic theory pertains to which organelle within eukaryotes because of the presence of 70S ribosomes, circular DNA, and the replication of this organelle independent from mitosis? O 1) nucleus O 2) lysosomes. O 3) golgi 4) endoplasmic reticulum 5: O 5) mitochondriaarrow_forward
- Explain in detail how cytoskeletal elements function at a molecular level to bring about movement in eukaryotic cells.arrow_forwardName the two places in the eukaryotic cell where the cell component Ribosome, mRNA, tRHA and rRNA are found?arrow_forwardBriefly describe the structure and function of each of the following: plasma membrane, chromatin, nucleus, nucleolus, rough endoplasmic reticulum (rough ER), Golgi complex, lysosomes, mitochondria, microfilaments, microtubules, intermediate filaments, centrioles, basal body (kinetosome), tight junction, gap junction, desmosome, glycoprotein, microvilli.arrow_forward
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