Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
Publisher: PEARSON
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Textbook Question
Chapter 5.1, Problem 2CC
WHAT IF? How would the membrane lipid composition of a native grass found in very warm soil around hot springs compare with that of a native grass found in cooler soil? Explain.
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MAKE CONNECTIONS Aquaporins exclude passage ofhydronium ions (H3O+), but some aquaporins allow passage of glycerol, a three-carbon alcohol (see Figure 5.9),as well as H2O. Since H3O+is closer in size to water thanglycerol is, yet cannot pass through, what might be thebasis of this selectivity?
WHAT IF? Some membrane proteins diffuse faster in the plasma membrane when the cytoskeleton or the extracellular matrix is artificially removed than when cells are unperturbed. Explain why.
WHAT IF? Suppose a membrane surrounded an oildroplet, as it does in the cells of plant seeds and in someanimal cells. Describe and explain the form it might take
Chapter 5 Solutions
Campbell Biology in Focus
Ch. 5.1 - Plasma membrane proteins have carbohydrates...Ch. 5.1 - WHAT IF? How would the membrane lipid composition...Ch. 5.2 - What property allows O2 and CO2, to cross a lipid...Ch. 5.2 - Why is a transport protein needed to move many...Ch. 5.2 - MAKE CONNECTIONS Aquaporins exclude passage of...Ch. 5.3 - How do you think a cell performing cellular...Ch. 5.3 - WHAT IF? If a Paramecium caudatum cell swims from...Ch. 5.4 - Sodium-potassium pumps help nerve cells establish...Ch. 5.4 - Prob. 2CCCh. 5.4 - MAKE CONNECTIONS Review the characteristics of the...
Ch. 5.5 - As a cell grows, its plasma membrane expands. Does...Ch. 5.5 - Prob. 2CCCh. 5.5 - MAKE CONNECTIONS In Concept 4.7, you learned that...Ch. 5.6 - During an epinephrine-initiated signal in liver...Ch. 5.6 - When a signal transduction pathway involves a...Ch. 5.6 - WHAT IF? How can a target cells response to a...Ch. 5 - In what way do the membranes of a eukaryotic cell...Ch. 5 - Which of the following factors would tend to...Ch. 5 - Phosphorylation cascades involving a series of...Ch. 5 - Lipid-soluble signaling molecules, such as...Ch. 5 - Which of the following processes includes all the...Ch. 5 - Based on Figure 5.17.which of these experimental...Ch. 5 - Prob. 7TYUCh. 5 - SCIENCE, TECHNOLOGY, AND SOCIETY Extensive...Ch. 5 - FOCUS ON EVOLUTION Paramecium and other...Ch. 5 - FOCUS ON INTERACTIONS A human pancreatic cell...Ch. 5 - SYNTHESIZE YOUR KNOWLEDGE In the supermarket,...
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- WHAT IF? Given a liter of pure water and a liter solution of acetic acid, what would happen to the pH, ingeneral, if you added 0.01 mol of a strong acid to each?Use the reaction from question 3 to explain the result.arrow_forwardGiven: A 10,000L bioreactor may have 100 trillion cells. Let’s assume that this cell solution has the same density as water. (answer A, B, and C) A. What cell density is this (per kg)? B. What is the ratio of cell density in your body compared to that in a bioreactor? C. What is limiting cell densities in a bioreactor that your body has managed to overcome?arrow_forwardCheck the TRUE alternative in relation to amino acids and proteins: (a) the precipitation of a protein is always an irreversible process (b) the isoelectric point of amino acids with non-ionizable side chain is reached at neutral pH (= 7) (c) all the amino acids that make up our proteins have a chiral carbon whose configuration is (S) (d) denaturation affects all structural levels of proteins (e) all amino acids are soluble in water and have relatively high melting pointsarrow_forward
- CONSTRUCTIVE RESPONSE. Answer the following questions. What are the requirements for molecules to form hydrogen bond? (What atoms must be present and involved in such bonds?) How are hydrogen bonds involved in the transfer of genetic information? How does water dissolve polar and ionic compounds? Explain the process of these interactions. How does water affect the structure of biomolecules? What is the difference between a polar molecule, a non-polar molecule, and a dipole molecule? How do these molecules affect the intermolecular forces? Discuss the difference between hydrophobic, hydrophilic, amphipathic, and amphiphilic moleculearrow_forwardBiomembranes contain many different types of lipid molecules. What are the three main types of lipid molecules found in biomembranes? How are the three types similar, and how are they different?arrow_forwardWHAT IF? Predict what would happen if you mixedgastric juice with crushed food in a test tube.arrow_forward
- Solve correctly please. (Gpt/Ai wrong answer not allowed) Which property of water has had the MOST profound consequence for aquatic organisms? Question 33 options: a) Water has a high specific heat. b) Due to hydrogen bonding, solid water is less dense than liquid water. c) Nonpolar molecules are poorly soluble in water. d) Water has a high melting point. e) Water has a high heat of vaporization.arrow_forwardhttps://www.youtube.com/watch?v=YP8hYJcIRuo Explain how the experiment shown models a semi-permeable membrane. What direct, observable evidence do we have that starch was not able to diffuse through the membrane?arrow_forwardi just answered a hw question that i was a little confused on. i answered it but am not fully sure if it's correct. so can you take a look at check if my answer is correct and if it's not, then a explaintion would be helpful. Would you expect water molecules to move faster when there is a HIGH concentration gradient or a LOW concentration gradient? Water molecules would move faster when there is a high concentration gradient because the pressure for the molecules in the high concentration to reach equilibrium increases since there are more molecules there than in the low concentration. So as the molecules move down the concentration gradient faster to equalize the concentration on both sides due to the increased pressure, the rate of diffusion increases.arrow_forward
- VOLUTION CONNECTION This chapter explains how theemergent properties of water contribute to the suitabilityof the environment for life. Until fairly recently, scientistsassumed that other physical requirements for life includeda moderate range of temperature, pH, atmospheric pressure,and salinity, as well as low levels of toxic chemicals. Thatview has changed with the discovery of organisms knownas extremophiles, which have been found flourishing inhot, acidic sulfur springs, around hydrothermal ventsdeep in the ocean, and in soils with high levels of toxicmetals. Why would astrobiologists be interested in studyingextremophiles? What does the existence of life in suchextreme environments say about the possibility of life onother planets?arrow_forwardIn each of the three systems, determine the state of entropy (low or high) when comparing the first and second: i. the instant that a perfume bottle is sprayed compared with 30 seconds later, ii. an old 1950s car compared with a brand new car, and iii. a living cell compared with a dead cell. a. i. low, ii. high, iii. low b. i. low, ii. high, iii. high c. i. high, ii. low, iii. high d. i. high, ii. low, iii. lowarrow_forward1. Channel proteins used for the bulk passage of water molecules across the cell membrane?2. The tonicity of the extracellular fluid that maintains the turgid appearance of plant cells?3. The tonicity of the extracellular environment causing plasmolysis of plant cells?4. Plant cells are said to be flaccid in this type of cellular environment or solution?arrow_forward
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