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 14, Problem 14.2CC
CONCEPT CHECK 14.2
Human sperm swim using a flagellum. They also have mitochondria at the base of the flagellum (see Figure 4.13). What advantage do you think this structure provides, based on what you know about flagella?
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Exercise 5
Membrane receptors are proteins that are incorporated in the cytoplasmic membrane of a cell, allowing the
detection of specific molecules such as (hormones, growth factor) and triggering a cascade of biochemical
Synthesis of protein
reactions.
The adjacent schema represents the steps of
the synthesis of these membrane receptors.
1. Label the structures from a to f.
In order to study the biosynthesis and
secretion of this protein (membrane
receptors), a solution containing radioactive
amino acid was injected in the blood of an
animal. Samples of certain cells were taken
at regular intervals of time. The intensity of
radioactivity was measured in different
cellular organelles.
2000
The table below represents the variations of the quantity of a membrane protein in different parts of the cell,
as function of time.
Time (min)
15
40
50
Structure X
26
12
2
1
Structure Z
0.
6.
10
6.
Structure Y
0.
10
24
2. Represent the obtained results in the form
3. 3.1. Analyze the obtained…
Molecular Biochemistry
Q. Why can’t Myosin V motor proteins “walk” towards the negative end of the actin molecule? Why do most myosins move toward the positive end? Why do most myosins move toward the positive end instead of the negative end? Explain
Participation Problem: Chapter 10, Problem 4: The lipid portion of a typical bilayer is about 30
Å thick.
(a) Calculate the minimum number of residues in an a-helix required to span this distance.
(b) Calculate the minimum number of residues in a ß-strand required to span this distance.
Skip part (c)
(d) The epidermal growth factor receptor (EGFR) has a single transmembrane helix. Find it in
this partial sequence.
...RGPKIPSIATGMVGALLLLVVALGIGILFMRRRH...
Table for reference (for parts a-b):
TABLE 6.1 Parameters of some polypeptide
secondary structures
Structure Type
B Strand (antiparallel)
B Strand (parallel)
a helix
310 helix
Polypeptide II helix
Residues
per Turn
2.0
2.0
3.6
3.0
3.0
Rise (h) per
Residue
3.4 Å
3.2 Å
1.5 Å
2.0 Å
4.7 Å
Pitch (p)
6.8 Å
6.4 Å
5.4 Å
6.0 Å
9.4 Å
Chapter 14 Solutions
Becker's World of the Cell (9th Edition)
Ch. 14 - If myosin V moved more like an inchworm (meaning...Ch. 14 - Kinesins and dyneins are both microtubule-based...Ch. 14 - CONCEPT CHECK 14.2 Human sperm swim using a...Ch. 14 - A single myosin II motor domain can exert about 15...Ch. 14 - Prob. 14.4CCCh. 14 - In addition to being found at the rear of...Ch. 14 - Ciliobrevins. Ciliobrevins were reported in 2012...Ch. 14 - Prob. 14.2PSCh. 14 - Prob. 14.3PSCh. 14 - Rigor Mortis and the Contraction Cycle. After...
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