Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
expand_more
expand_more
format_list_bulleted
Videos
Textbook Question
Chapter 23, Problem 23.5PS
The Eyes Have It. For this question, please consult Figure 23-21. Recall that each ommatidium in the compound eye contains a photoreceptor cell, R7, that must receive a signal from a neighboring cell, R8, to differentiate. This pathway depends on the Ras signaling pathway. Also, recall that mutants provide insight into this pathway. For each of the following situations, indicate whether the R7 cell would be expected to differentiate. In each case, clearly state your reasoning, based on your understanding of the molecular pathway involved.
- (a) R7 cells are mutated so that their Sevenless receptors lack the SH2-binding domain.
- (b) R7 cells are mutated so that they lack functional Sos but contain a constitutively active, dominant mutation in Ras.
- (c) R7 cells are mutated so that they have no functional MAP kinase.
- (d) R8 cells are mutated so that they produce too much of the Bride of sevenless ligand, and R7 cells lack Sevenless.
Expert Solution & Answer
Want to see the full answer?
Check out a sample textbook solution
Students have asked these similar questions
O Macmillan Learning
You have 0.100 M solutions of acetic acid (pKa = 4.76) and sodium acetate. If you wanted to prepare 1.00 L of 0.100 M acetate
buffer of pH 4.00, how many milliliters of acetic acid and sodium acetate would you add?
acetic acid:
mL
sodium acetate:
mL
How does the cost of food affect the nutritional choices people make?
Biopharmaceutics and Pharmacokinetics:Two-Compartment Model Zero-Order Absorption Questions
SHOW ALL WORK, including equation used, variables used and each step to your solution, report your regression lines and axes names (with units if appropriate) :Calculate a-q
a) B1,
b) B2,
c) hybrid rate constant (1)
d) hybrid rate constant (2)
e) t1/2,dist
f) t1/2,elim
g) k10
h) k12
i) k21
j) initial concentration (C0)
k) central compartment volume (V1)
l) steady-state volume (Vss)
m) clearance (CL) AUC (0→10 min) using trapezoidal rule
n) AUC (20→30 min) using trapezoidal rule
o) AUCtail (AUC360→∞)
p) total AUC (using short cut method)
q) volume from AUC (VAUC)
Chapter 23 Solutions
Becker's World of the Cell (9th Edition)
Ch. 23 - One effect of the hormone insulin is to cause...Ch. 23 - You are working on a new species of sea urchin...Ch. 23 - The Ca2+ concentration in unstimulated cells is...Ch. 23 - Prob. 23.3CCCh. 23 - Prob. 23.4CCCh. 23 - Prob. 23.5CCCh. 23 - Chemical Signals and Second Messengers. Fill in...Ch. 23 - QUANTITATIVE Pure agony. Agonists are drugs that...Ch. 23 - Heterotrimeric and Monomeric G Proteins. G...Ch. 23 - Calcium Chelators and Ionophores. In addition to...
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, biology and related others by exploring similar questions and additional content below.Similar questions
- What are some external influences that keep people from making healthy eating decisions?arrow_forwardWhat type of structure(s) would you expect to see in peripheral membrane proteins? (mark all that apply) A. Amphipathic alpha helix (one side is hydrophilic and one side is hydrophobic) B. A hydrophobic beta barrel C. A hydrophobic alpha helix D. A chemical group attached to the protein that can anchor it to the membranearrow_forwardTemporal flexibility (the ability to change over time) of actin structures within a cell is maintained by… A. The growth/shrinkage cycle B. Periodic catastrophe C. GTP hydrolysis D. Treadmilling E. None of the abovearrow_forward
- During in vitro polymerization of actin and microtubule filaments from their subunits, what causes the initial delay in filament growth? A.Nucleation B.Reaching homeostasis C.Nucleotide exchange D.ATP or GTP hydrolysis E.Treadmillingarrow_forwardYou expect to find which of the following in the Microtubule Organizing Center (MTOC)...(mark all that apply) A. Gamma tubulin B. XMAP215 C. Centrioles D. Kinesin-13arrow_forwardThe actin-nucleating protein formin has flexible “arms” containing binding sites that help recruit subunits in order to enhance microfilament polymerization. What protein binds these sites? A.Thymosin B.Profilin C.Cofilin D.Actin E.Tropomodulinarrow_forward
- While investigating an unidentified motor protein, you discover that it has two heads that bind to actin. Based on this information, you could confidently determine that it is NOT... (mark all that apply) A. A myosin I motor B. A dynein motor C. A myosin VI motor D. A kinesin motorarrow_forwardYou isolate the plasma membrane of cells and find that . . . A. it contains regions with different lipid compositions B. it has different lipid types on the outer and cytosolic leaflets of the membrane C. neither are possible D. A and B both occurarrow_forwardYou are studying the mobility of a transmembrane protein that contains extracellular domains, one transmembrane domain, and a large cytosolic domain. Under normal conditions, this protein is confined to a particular region of the membrane due to the cortical actin cytoskeletal network. Which of the following changes is most likely to increase mobility of this protein beyond the normal restricted region of the membrane? A. Increased temperature B. Protease cleavage of the extracellular domain of the protein C. Binding to a free-floating extracellular ligand, such as a hormone D. Protease cleavage of the cytosolic domain of the protein E. Aggregation of the protein with other transmembrane proteinsarrow_forward
- Topic: Benthic invertebrates as an indicator species for climate change, mapping changes in ecosystems (Historical Analysis & GIS) What objects or events has the team chosen to analyze? How does your team wish to delineate the domain or scale in which these objects or events operate? How does that limited domain facilitate a more feasible research project? What is your understanding of their relationships to other objects and events? Are you excluding other things from consideration which may influence the phenomena you seek to understand? Examples of such exclusions might include certain air-born pollutants; a general class of water bodies near Ottawa, or measurements recorded at other months of the year; interview participants from other organizations that are involved in the development of your central topic or issue. In what ways do your research questions follow as the most appropriate and/or most practical questions (given the circumstances) to pursue to better understand…arrow_forwardThe Esp gene encodes a protein that alters the structure of the insulin receptor on osteoblasts and interferes with the binding of insulin to the receptor. A researcher created a group of osteoblasts with an Esp mutation that prevented the production of a functional Esp product (mutant). The researcher then exposed the mutant strain and a normal strain that expresses Esp to glucose and compared the levels of insulin in the blood near the osteoblasts (Figure 2). Which of the following claims is most consistent with the data shown in Figure 2 ? A Esp expression is necessary to prevent the overproduction of insulin. B Esp protein does not regulate blood-sarrow_forwardPredict the per capita rate of change (r) for a population of ruil trees in the presence of the novel symbiont when the soil moisture is 29%. The formula I am given is y= -0.00012x^2 + 0.0088x -0.1372. Do I use this formula and plug in 29 for each x variable?arrow_forward
arrow_back_ios
SEE MORE QUESTIONS
arrow_forward_ios
Recommended textbooks for you
BiochemistryBiochemistryISBN:9781305577206Author:Reginald H. Garrett, Charles M. GrishamPublisher:Cengage Learning
Biology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStax
Biology: The Dynamic Science (MindTap Course List)BiologyISBN:9781305389892Author:Peter J. Russell, Paul E. Hertz, Beverly McMillanPublisher:Cengage Learning
Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning
Biochemistry
Biochemistry
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Cengage Learning
Biology 2e
Biology
ISBN:9781947172517
Author:Matthew Douglas, Jung Choi, Mary Ann Clark
Publisher:OpenStax
Biology: The Dynamic Science (MindTap Course List)
Biology
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Cengage Learning
Biology Today and Tomorrow without Physiology (Mi...
Biology
ISBN:9781305117396
Author:Cecie Starr, Christine Evers, Lisa Starr
Publisher:Cengage Learning
Human Heredity: Principles and Issues (MindTap Co...
Biology
ISBN:9781305251052
Author:Michael Cummings
Publisher:Cengage Learning
Biology (MindTap Course List)
Biology
ISBN:9781337392938
Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. Berg
Publisher:Cengage Learning
What are Mutations and what are the different types of Mutations?; Author: Science ABC;https://www.youtube.com/watch?v=I16YlE8qTBU;License: Standard youtube license