Which of the following filaments have structural polarity? intermediate filaments actin filaments both intermediate filaments and...
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Which of the following filaments have structural polarity?
intermediate filaments
actin filaments
both intermediate filaments and actin filaments
neither intermediate filaments nor actin filaments
Homework Answers
ans-option 2) actin filaments
is correct, because every actin subunit faces in the same direction
with deffer ends.
Add Answer to:
Which of the following filaments have structural polarity?
intermediate filaments
actin filaments
both intermediate filaments and...
2. Actin filaments are polarized. Intermediate filaments are non-polar. Myosin thick filaments are bipolar. a. Explain...
2. Actin filaments are polarized. Intermediate filaments are non-polar. Myosin thick filaments are bipolar. a. Explain how the assembly of these filaments from their soluble monomers determines whether they are polar, nonpolar or bipolar. b. Why are the two ends of actin filaments designated as being ‘plus’ or ‘minus’? c. Why do intermediate filaments have such high tensile strength?
As actin and myosin filaments slide past each other during muscle contraction. actin filaments shorten, while...
As actin and myosin filaments slide past each other during muscle contraction. actin filaments shorten, while myosin filaments do not myosin filaments shorten, while actin filaments do not both actin and myosin filaments shorten neither actin nor myosin filaments shorten The Ca^2+ required for skeletal muscle contraction is released from the sarcoplasmic reticulum. enters the cell due to the opening of voltage regulated Ca^2+ channels from the T tubules. is actively transported into the cell. is released from mitochondria Myocardial...
For each of the following, decide whether it applies to actin filaments, intermediate filaments, and/or microtubules....
For each of the following, decide whether it applies to actin filaments, intermediate filaments, and/or microtubules. NOTE: there may be multiple answers for each statement. Found in the nucleus and cytoplasm ANSWER: Involved in the transport of vesicles and organelles ANSWER: Associate with proteins that help adhere cells to the extracellular matrix ANSWER: Their stability is influenced by nucleotide hydrolysis ANSWER: Directly involved in phagocytosis ANSWER: Can associate into bundles with the help of other proteins ANSWER:
a. Although not considered as dynamic as actin filaments or microtubules, intermediate filament assemble and disassembly...
a. Although not considered as dynamic as actin filaments or microtubules, intermediate filament assemble and disassembly is routinely regulated by cells. What mechanism is used to control assembly of intermediate filaments? b. Intermediate filaments are difficult to disassemble during purification but cells normally disassemble all types of intermediate filaments at the beginning of M phase? How is this done?
As actin and myosin filaments slide past each other during muscle contraction, i. actin filaments shorten,...
As actin and myosin filaments slide past each other during muscle contraction, i. actin filaments shorten, while myosin filaments do not ii. myosin filaments shorten, while actin filaments do not iii. both actin and myosin filaments shorten iv. neither actin nor myosin filaments shorten The Ca^2+ required for skeletal muscle contraction i. is released from the sarcoplasmic reticulum. ii. enters the cell due to the opening of voltage regulated Ca^2+ channels from the T tubules. iii. is actively transported into...
Which of the following is true concerning actin filaments and their associated proteins? Myosin can cause...
Which of the following is true concerning actin filaments and their associated proteins? Myosin can cause actin filament sliding. Actin has intrinsic ATPase activity. All of these ARPs are required for formation of actin bundles at structures called lamellipodia.
Actin Microtubules Intermediate Filaments Intracellular Preference Location Treadmilling in in Test ube Treadmilling in living cell...
Actin Microtubules Intermediate Filaments Intracellular Preference Location Treadmilling in in Test ube Treadmilling in living cell Any unique characteristics
Isolated bundles of actin filaments from the acrosomal processes of Limuluspolyphemus(horseshoe crab) sperm have readily distinguishable...
Isolated bundles of actin filaments from the acrosomal processes
of Limuluspolyphemus(horseshoe crab) sperm have readily
distinguishable plus ends (tapered) and minus ends
(blunt). Assembly at the ends of such bundles was used
to determine the mechanism of action of phalloidin, which has a
marked effect on actin assembly. When phalloidin is mixed with
actin in a molar ratio of at least 1:1, the growth rate increases
at both ends, as shown for minus ends in Fig.
16-11A. Because growth rate = kon[actin]...
How do intermediate filaments assemble from their subunits in a way that loses their polarity? ii...
How do intermediate filaments assemble from their subunits in a way that loses their polarity? ii FF • S B IU QiLearn Video
You have added a pure solution of formin to a solution of actin in ionic conditions...
You have added a pure solution of formin to a solution of actin in ionic conditions appropriate for actin polymerization (i.e. 100 mM K+, 2 mM Mg2+, and 1 mM ATP). What do you predict occurs to the rate of actin filament assembly? o The rate of actin filament assembly increases only on the plus ends of the actin filaments, on the minus end it is unchanged. The rate of actin filament assembly is unchanged at the minus end and...
As actin and myosin filaments slide past each other during muscle contraction. actin filaments shorten, while myosin filaments do not myosin filaments shorten, while actin filaments do not both actin and myosin filaments shorten neither actin nor myosin filaments shorten The Ca^2+ required for skeletal muscle contraction is released from the sarcoplasmic reticulum. enters the cell due to the opening of voltage regulated Ca^2+ channels from the T tubules. is actively transported into the cell. is released from mitochondria Myocardial...
As actin and myosin filaments slide past each other during muscle contraction, i. actin filaments shorten, while myosin filaments do not ii. myosin filaments shorten, while actin filaments do not iii. both actin and myosin filaments shorten iv. neither actin nor myosin filaments shorten The Ca^2+ required for skeletal muscle contraction i. is released from the sarcoplasmic reticulum. ii. enters the cell due to the opening of voltage regulated Ca^2+ channels from the T tubules. iii. is actively transported into...
Which of the following is true concerning actin filaments and their associated proteins? Myosin can cause actin filament sliding. Actin has intrinsic ATPase activity. All of these ARPs are required for formation of actin bundles at structures called lamellipodia.
Actin Microtubules Intermediate Filaments Intracellular Preference Location Treadmilling in in Test ube Treadmilling in living cell Any unique characteristics
Isolated bundles of actin filaments from the acrosomal processes
of Limuluspolyphemus(horseshoe crab) sperm have readily
distinguishable plus ends (tapered) and minus ends
(blunt). Assembly at the ends of such bundles was used
to determine the mechanism of action of phalloidin, which has a
marked effect on actin assembly. When phalloidin is mixed with
actin in a molar ratio of at least 1:1, the growth rate increases
at both ends, as shown for minus ends in Fig.
16-11A. Because growth rate = kon[actin]...
How do intermediate filaments assemble from their subunits in a way that loses their polarity? ii FF • S B IU QiLearn Video
You have added a pure solution of formin to a solution of actin in ionic conditions appropriate for actin polymerization (i.e. 100 mM K+, 2 mM Mg2+, and 1 mM ATP). What do you predict occurs to the rate of actin filament assembly? o The rate of actin filament assembly increases only on the plus ends of the actin filaments, on the minus end it is unchanged. The rate of actin filament assembly is unchanged at the minus end and...
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