Becker's World of the Cell (9th Edition)
9th Edition
ISBN: 9780321934925
Author: Jeff Hardin, Gregory Paul Bertoni
Publisher: PEARSON
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Chapter 2, Problem 2.6PS
It’s All About Membranes. Answer each of the following questions about biological membranes in 50 words or less:
(a) What is an amphipathic molecule? Why are amphipathic molecules important constituents of membranes?
(b) Why are membranes lipid bilayers and not monolayers?
(c) What does “selectively permeable” mean?
(d) If a lipid bilayer is at least 108 times less permeable to K+ ions than it is to water, how do the K+ ions that are needed for many cellular functions get into the cell?
(e) It is often possible to predict the number of times a membrane protein crosses the membrane by determining how many short sequences of hydrophobic amino acids are present in the amino acid sequence of the protein. Explain.
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Image analysis.
The outer boundary of the cell is the plasma membrane.In the image below,
molecules that cannot cross the membrane are glucose and ions.Why can't they
cross the membrane? [MA]
(c)
(d)
(a)
Small uncharged
molecules
(b)
Lipid-soluble Water-soluble
substances
lons
substances
Glucose
Hydrocarbon
Nat
K+
H20
CO2
H+
cF Cat+
NH3
O They are hydrophobic
O They are hydrophilic
O large
O Na, K, Ca and H ions will bind with phosphate
Chloride ions will be repelled by phosphate
they are small in size
to
Please ASAP. Thanku.
Which of the following can undergo simple diffusion through a phospholipid bilayer?
K+
H2O
CO2
Glucose
Please help me with this question. More than one answer may be correct.
Intermediate filaments
Options:
A)
are larger than 10nm in diameter
B)
have a hollow core
C)
include microtubules
D)
uses a filamentous monomers
E)
have multiple types of monomers they can be composed of.
Chapter 2 Solutions
Becker's World of the Cell (9th Edition)
Ch. 2 - What properties of the carbon atom make it...Ch. 2 - QUESTION: Compare the flights of the ionized...Ch. 2 - How would the properties of water change if the...Ch. 2 - Why is the amphipathic nature of membrane...Ch. 2 - Problem Set CONCEPT CHECK 2.4 What characteristics...Ch. 2 - Problem Set CONCEPT CHECK 2.5 TMV is an...Ch. 2 - The Fitness of Carbon. Each of the properties that...Ch. 2 - The Fitness of Water. For each of these statements...Ch. 2 - Wrong Again. For each of the following false...Ch. 2 - Prob. 2.4PS
Ch. 2 - Drug Targeting. Your company has developed a new...Ch. 2 - Its All About Membranes. Answer each of the...Ch. 2 - The Polarity of Water. Defend the assertion that...Ch. 2 - QUANTITATIVE Bond Energies. A single covalent bond...Ch. 2 - TMV Assembly. Each of these statements is an...Ch. 2 - Mars Is Alive? Imagine this futuristic scenario:...
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