Concept explainers
Videos
In what way do the membranes of a eukaryotic cell vary?
- A. Phospholipids are found only in certain membranes.
- B. Certain proteins are unique to each kind of membrane.
- C. Only certain membranes of the cell are selectively permeable.
- D. Only certain membranes are constructed from amphipathic molecules.
Introduction:
The lipid bilayer model of the membrane consists of proteins and lipids with triacylglycerols. This structure maintains the fluidity of membrane. Various phospholipids are present in the membrane. They consist of a hydrophilic head and a hydrophobic tail. The presence of the lipid cholesterol provides flexibility to the membrane at various temperatures. Various unique proteins are present in the membrane like cell signaling proteins and growth receptors.
Answer to Problem 1TYU
Correct answer:
The membrane is unique and consists of lipids and proteins. The proteins present in the membrane are specific and form an essential part of cell signaling and growth receptor signaling response. Therefore, option (B) is correct.
Explanation of Solution
Reason for the correct statement:
The membrane of the cells contains unique proteins. The proteins are present in the membrane are specific and help in the signaling inside the cells by the activation of the protein growth factor receptors.
Option (B) is given as “Certain proteins are unique to each kind of membrane”.
As, “the proteins present in the membrane of a eukaryotic cell are unique and perform specific functions according to the type of proteins present in the cell”, it is the right answer.
Hence, option (B) is correct.
Reasons for the incorrect statements:
Option (A) is given as “Phospholipids are found only in certain membranes”. Phospholipids are present in the membranes, but the proteins present in the membrane are unique, specific and diverse. So, it is the wrong answer.
Option (C) is given as “Only certain membranes of the cell are selectively permeable”. The cell membranes are selectively permeable to the movement of the various solutes like glucose and ions, which cross the membrane across the protein channels. They are unique and specific to the membrane. So, it is a wrong answer.
Option (D) is given as “Only certain membranes are constructed from amphipathic molecules”.
The membrane molecules are amphipathic, but the proteins formed in the membrane are specific and unique. So, it is a wrong answer.
Hence, options (A), (C), and (D) are incorrect.
The proteins present in the membrane are unique, specific and are of various types. These include the cell signaling proteins, growth factor receptor proteins, post-translationally modified proteins, blood group proteins, and cluster of differentiation receptor proteins.
Want to see more full solutions like this?
Chapter 5 Solutions
Campbell Biology In Focus, Loose-leaf Edition (3rd Edition)
Additional Science Textbook Solutions
Chemistry: Structure and Properties (2nd Edition)
Campbell Biology: Concepts & Connections (9th Edition)
Chemistry: An Introduction to General, Organic, and Biological Chemistry (13th Edition)
Cosmic Perspective Fundamentals
Microbiology with Diseases by Body System (5th Edition)
Chemistry & Chemical Reactivity
- Molecular Biology Please help with question. Thank you in advance. Discuss, compare and contrast the structure of promoters inprokaryotes and eukaryotes.arrow_forwardMolecular Biology Please help with question. Thank you You are studying the expression of the lac operon. You have isolated mutants as described below. In the absence of glucose, explain/describe what would happen, for each mutant, to the expression of the lac operon when you add lactose AND what would happen when the bacteria has used up all of the lactose (if the mutant is able to use lactose).1. Mutations in the lac repressor gene that would prevent the binding of lactose2. Mutations in the lac repressor gene that would prevent release of lactose once lactose hadbound3. Normally the lac repressor gene is located next to (a few hundred base pairs) and upstreamfrom the lac operon. Mutations in the lac repressor gene that move the lac repressor gene 100,000base pairs downstream.4. Mutations in the lac operator that would prevent binding of lac repressorarrow_forwardYou have returned to college to become a phylogeneticist. One of the first things you wish to do is determine how mammals, birds, and reptiles are related. Like any good scientist, you need to consider all available data objectively and without a preconceived “correct” answer. In pursuit of that, you should produce a phylogenetic tree based only on morphological features that show birds and mammals are more closely related. You will then produce a totally different tree, also using morphological features, that shows birds and reptiles are more closely related. Do not forget to include all three groups in both your trees. Based solely off the trees you produce, which relationship would you consider the more likely and why? Once you have answered that question, provide a brief summary of the “modern” understanding of the relationship between these three groups.arrow_forward
- true or false, the reason geckos can walk on walls is hydrogen bonding between their foot pads and the moisture on the wall.arrow_forwardBiology laboratory problem Please help. thank you You have 20 ul of DNA solution and 6X DNA loading buffer solution. You have to mix your DNA solution and DNA loading buffer before load DNA in an agarose gel. The concentration of the DNA loading buffer must be 1X in the DNA and DNA-loading buffer mixture after you mix them. For that, I will add _____ ul of 6X loading buffer to the 20 ul DNA solution.arrow_forwardBiology lab problem To make 20 ul of 5 mM MgCl2 solution using 50 mM MgCl2 stock solution and distilled water, I will mix ________ ul of 50 mM MgCl2 solution and ________ ul of distilled water. Please help . Thank youarrow_forward
- Biology Please help. Thank you. Biology laboratory question You need 50 ml of 1% (w/v) agarose gel. Agarose is a powder. How would you make it? You can ignore the volume of agarose powder. Don't forget the unit.TBE buffer is used to make an agarose gel, not distilled water. I will add _______ of agarose powder into 50 ml of distilled water (final 50 ml).arrow_forwardAn urgent care center experienced the average patient admissions shown in the Table below during the weeks from the first week of December through the second week of April. Week Average Daily Admissions 1-Dec 11 2-Dec 14 3-Dec 17 4-Dec 15 1-Jan 12 2-Jan 11 3-Jan 9 4-Jan 9 1-Feb 12 2-Feb 8 3-Feb 13 4-Feb 11 1-Mar 15 2-Mar 17 3-Mar 14 4-Mar 19 5-Mar 13 1-Apr 17 2-Apr 13 Forecast admissions for the periods from the first week of December through the second week of April. Compare the forecast admissions to the actual admissions; What do you conclude?arrow_forwardAnalyze the effectiveness of the a drug treatment program based on the needs of 18-65 year olds who are in need of treatment by critically describing 4 things in the program is doing effectively and 4 things the program needs some improvement.arrow_forward
- I have the first half finished... just need the bottom half.arrow_forward13. Practice Calculations: 3 colonies were suspended in the following dilution series and then a viable plate count and microscope count was performed. Calculate IDF's, TDF's and then calculate the CFU/mL in each tube by both methods. Finally calculate the cells in 1 colony by both methods. Show all of your calculations in the space provided on the following pages. 3 colonies 56 cells 10 μL 10 μL 100 μL 500 με m OS A B D 5.0 mL 990 με 990 με 900 με 500 μL EN 2 100 με 100 μL 118 colonies 12 coloniesarrow_forwardDescribe and give a specific example of how successionary stage is related to species diversity?arrow_forward
Concepts of BiologyBiologyISBN:9781938168116Author:Samantha Fowler, Rebecca Roush, James WisePublisher:OpenStax College
Biology Today and Tomorrow without Physiology (Mi...BiologyISBN:9781305117396Author:Cecie Starr, Christine Evers, Lisa StarrPublisher:Cengage Learning
Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage Learning