What is the function of proteins like microtubules and actin filaments?

What is the function of proteins like microtubules and actin filaments?
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Give structure to cells.
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Endoskeleton of a cell is made up of (A) Microtubules (B) Microfilaments (C) Intermediate filaments (D) All of these

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Last Answer : (D) All of these

Which of the following are regularly assembled and disassembled during cell cycle. (A) Microtubules (B) Intermediate filaments (C) Both A and B (D) None of these

Description : Which of the following are regularly assembled and disassembled during cell cycle. (A) Microtubules (B) Intermediate filaments (C) Both A and B (D) None of these

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Microtubules consist of helically stacked molecules of the protein (A) Actin (B) Myosin (C) Keratin (D) Tubulin

Description : Microtubules consist of helically stacked molecules of the protein (A) Actin (B) Myosin (C) Keratin (D) Tubulin

Last Answer : (D) Tubulin

The activities of the cytoskeleton is dependent on which of the following types of filaments? a. Microtubules b. Intermediate filaments c. Actin filaments d. None of the above

Description : The activities of the cytoskeleton is dependent on which of the following types of filaments? a. Microtubules b. Intermediate filaments c. Actin filaments d. None of the above

Last Answer : Answer: a, b, c The cytoskeleton is a collection of filamentous protein structures that allow cells to assume and maintain a variety of shapes, to produce directed movement of ... activities depend upon three main types of filaments: actin filaments, intermediate filaments, and microtubules

which substance are microtubules made ?

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The three-dimensional network of protein filaments within the cytoplasm of eukaryotic cells is called the (A) Endoplasmic reticulum (B) Golgi apparatus (C) Cytoskeleton (D) None of these

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The microfilaments composed of (A) Actin protein (B) Gelatin protein (C) Keratin protein (D) Tubulin protein

Description : The microfilaments composed of (A) Actin protein (B) Gelatin protein (C) Keratin protein (D) Tubulin protein

Last Answer : (A) Actin protein

In many types of cancer, proteins that are crucial regulators of the cell cycle are often mutated and cannot function correctly. This leads to the evasion of apoptosis and to the loss of control of cell proliferation? For example, many cancer cells carry two mutant copies of the gene that codes for a tumor suppressor protein named p53. What is the normal function of p53 that is lost when it is mutated?

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Last Answer : Normally, p53 senses DNA damage and acts as a transcription factor for checkpoint control genes.

In order to function, CDKs must interact with members of a separate family of proteins named the cyclins. Do individual cyclins remain associated with the same CDKs throughout the entire cell cycle?

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Last Answer : No. Separate cyclins interact with specific CDKs only during defined periods of the cell cycle.

Multiple checkpoints in the eukaryotic cell cycle ensure that division occurs only after sufficient growth and faithful DNA replication, and only when favorable conditions exist. Of the many proteins involved in cell cycle control, cyclin-dependent kinases (CDKs) are among the most important. How do CDKs function to control the cell cycle?

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Typically proteins do not work in their simple amino acid chain structure but instead fold and form shapes that help in their function. Which of the structures is described as being in alpha helices and beta sheets?

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The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as (a) microtubules (b) microfilaments (c) intermediate filaments (d) lamins.

Description : The solid linear cytoskeletal elements having a diameter of 6 nm and made up of a single type of monomer are known as (a) microtubules (b) microfilaments (c) intermediate filaments (d) lamins.

Last Answer : (b) microfilaments

The H-disk in the skeletal muscle fibre is due to (a) the absence of myofibrils in the central portion of Aband (b) the central gap between myosin filaments in the Aband Questions (c) the central gap between actin filaments extending through myosin filaments in the A-band (d) birefringence of myosin filaments in the central portion of A-band

Description : The H-disk in the skeletal muscle fibre is due to (a) the absence of myofibrils in the central portion of Aband (b) the central gap between myosin filaments in the Aband Questions (c) the ... myosin filaments in the A-band (d) birefringence of myosin filaments in the central portion of A-band

Last Answer : Ans:(c)

With reference to the skeletal muscle myofilaments a. actin is the major constituent of thin filaments b. myosin and tropomyosin combine to form the thick filaments c. troponin is a constituents of thin filaments d. tropomyosin prevents the interaction of actin and myosin in the resting state

Description : With reference to the skeletal muscle myofilaments a. actin is the major constituent of thin filaments b. myosin and tropomyosin combine to form the thick filaments c. troponin is a constituents of thin filaments d. tropomyosin prevents the interaction of actin and myosin in the resting state

Last Answer : actin is the major constituent of thin filaments

During muscle contraction in humans, the (a) sarcomere does not shorten (b) A band remains same (c) A, H and I bands shorten (d) actin filaments shorten.

Description : During muscle contraction in humans, the (a) sarcomere does not shorten (b) A band remains same (c) A, H and I bands shorten (d) actin filaments shorten.

Last Answer : (b) A band remains same

The H-zone in the skeletal muscle fibre is due to (a) the central gap between actin filaments extending through myosin filaments in the A-band (b) extension of myosin filaments in the central portion of the A-band (c) the absence of myofibrils in the central portion of A-band (d) the central gap between myosin filaments in the A-band.

Description : The H-zone in the skeletal muscle fibre is due to (a) the central gap between actin filaments extending through myosin filaments in the A-band (b) extension of myosin filaments in the central portion ... the central portion of A-band (d) the central gap between myosin filaments in the A-band.

Last Answer : (a) the central gap between actin filaments extending through myosin filaments in the A-band

Sliding filament theory can be best explained as (a) actin and myosin filaments do not shorten but rather slide pass each other (b) when myofilaments slide pass each other, myosin filaments shorten while actin filaments do not shorten (c) when myofilaments slide pass each other actin filaments shorten while myosin filaments do not shorten (d) actin and myosin filaments shorten and slide pass each other.

Description : Sliding filament theory can be best explained as (a) actin and myosin filaments do not shorten but rather slide pass each other (b) when myofilaments slide pass each other, myosin filaments shorten ... filaments do not shorten (d) actin and myosin filaments shorten and slide pass each other.

Last Answer : (a) actin and myosin filaments do not shorten but rather slide pass each other

How do the rough endoplasmic reticulum and the Golgi apparatus act in the production and releasing of proteins ?

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Without saturation of transport proteins and under same concentration gradient how can the speed of simple diffusion be compared to the speed of facilitated diffusion ?

Description : Without saturation of transport proteins and under same concentration gradient how can the speed of simple diffusion be compared to the speed of facilitated diffusion ?

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What are heterotrimeric G proteins?

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What are G proteins?

Description : What are G proteins?

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True or False: The vast majority of mitochondrial proteins are synthesized from genetic information encoded in the mitochondrial genome.

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Name the organelle that contains high levels of hydrolases and is responsible for digestion of proteins, sugars, nucleic acids and lipids.

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Describe how proteins that are synthesized in the endoplasmic reticulum (ER) are transported to their final destination.

Description : Describe how proteins that are synthesized in the endoplasmic reticulum (ER) are transported to their final destination.

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Name the type of proteins that work to catalyze metabolic reactions or can modify other proteins to switch their activity on or off.

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What types of proteins are involved in the packaging and condensing of DNA into tightly wound nucleosome structures of a chromosome?

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Metabolism is carried out by a large class of proteins that decrease the activation energy required for chemical reactions inside a cell. Therefore they only facilitate reactions that would naturally occur at a much slower rate. What is the name of these proteins that speed up biochemical reactions?

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A cell that is missing lysosomes would have difficulty doing what? (A) Digesting food (B) Storing energy (C) Packaging proteins (D) Moving cytoplasm

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Biochemically the ribosome consists of _______________ and some 50 structural . (A) mRNA, Carbohydrates (B) tRNA, lipids (C) mRNA, Proteins (D) rRNA, Proteins

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What is the function of the plant cell wall ?

Description : What is the function of the plant cell wall ?

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What is the function of Golgi complex?

Description : Q. What is the function of Golgi complex?

Last Answer : A. Maturation and processing of nascent proteins, glycosylation of proteins, secretion newly synthesised proteins

How do RTKs function?

Description : How do RTKs function?

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Briefly describe how ion channels function.

Description : Briefly describe how ion channels function.

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Which of the following structure-function pairs is mismatched? (A) Lysosome-intracellular digestion (B) Golgi body-secretion of cell products (C) Ribosome-protein synthesis (D) Glyoxysome-detoxification

Description : Which of the following structure-function pairs is mismatched? (A) Lysosome-intracellular digestion (B) Golgi body-secretion of cell products (C) Ribosome-protein synthesis (D) Glyoxysome-detoxification

Last Answer : (D) Glyoxysome-detoxification

It is a mesh of interconnected membranes that serve a function involving protein synthesis and transport. (A) Endoplasmic reticulum B) Cytoskeleton (C) Golgi apparatus (D) Both A and B

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Hydrogen peroxide degradation in a cell is a function of (A) Ribosomes (B) Mitochondria (C) Peroxisomes (D) Glyoxisomes

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Which of the following correctly matches an organelle with its function? (A) Mitochondrion . . . photosynthesis (B) Nucleus . . . cellular respiration (C) Ribosome . . . manufacture of lipids (D) Central vacuole . . . storage

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Microtubules and microfilaments are made from proteins that are shaped like?

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Last Answer : Microtubules 50nm, make up the larger part of the cytoskeleton,and they are hollow, and larger. Microfilaments 8-10 nm aresmaller, they are in a double helix shape, different frommicrotubules.

$ Rhodopsin of rod cells and iodospin of cone cells of retina are proteins ! Myosine and Actin are contractile proteins

Description : $ Rhodopsin of rod cells and iodospin of cone cells of retina are proteins ! Myosine and Actin are contractile proteins

Last Answer : $ Rhodopsin of rod cells and iodospin of cone cells of retina are proteins ! Myosine and Actin are ... wrong D. If both As and R are wrong.

Myosin bridges can be prevented from combining actin by two regulator proteins in resting muscle by (a) troponin (b) myofibril (c) troponin and tropomyosin (d) natural inhibiting proteins

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Last Answer : Ans:(c)

The contractile proteins in a muscle are (1) Actin and Myosin (2) Actin and Tropomyosin (3) Myosin and Troponin (4)Troponin and Tropomyosin

Description : The contractile proteins in a muscle are (1) Actin and Myosin (2) Actin and Tropomyosin (3) Myosin and Troponin (4)Troponin and Tropomyosin

Last Answer : (1) Actin and Myosin Explanation: Muscle fibers or myofibrils are formed of three types of proteins which are (1) contractile, (2) regulatory, and (3) structural. Contractile proteins are the force ... are Actin which is part of thin filament and Myosin, which is part of the thick filament.

Which one of the following is the correct matching of three items and their grouping category? Items Group (a) Ilium, ischium, Coxal bones of pelvic girdle pubis (b) Actin, myosin, Muscle proteins rhodopsin (c) Cytosine, uracil, Pyrimidines thiamine (d) Malleus, incus, Ear ossicles cochlea

Description : Which one of the following is the correct matching of three items and their grouping category? Items Group (a) Ilium, ischium, Coxal bones of pelvic girdle pubis (b) Actin, myosin, Muscle proteins rhodopsin (c) Cytosine, uracil, Pyrimidines thiamine (d) Malleus, incus, Ear ossicles cochlea

Last Answer : (a) Ilium, ischium, Coxal bones of pelvic girdle pubis

The major fibrous proteins are: a) peptone and edestin b) glutelin and leucine c) valine and lysine d) myosin and actin

Description : The major fibrous proteins are: a) peptone and edestin b) glutelin and leucine c) valine and lysine d) myosin and actin

Last Answer : ANSWER: D -- Myosin and Actin

The organic portion of bone consists of which one of the following proteins. a) fibrin b) collagen c) actin d) myosin

Description : The organic portion of bone consists of which one of the following proteins. a) fibrin b) collagen c) actin d) myosin

Last Answer : ANSWER: B -- COLLAGEN

The myofilaments of muscles consist primarily of two proteins. These two proteins are called: a) actin and myosin b) progesterone and testosterone c) progesterone and estrogen

Description : The myofilaments of muscles consist primarily of two proteins. These two proteins are called: a) actin and myosin b) progesterone and testosterone c) progesterone and estrogen

Last Answer : ANSWER: A -- ACTIN AND MYOSIN

The contractile proteins in a muscle are (1) Actin and Myosin (2) Actin and Tropomyosin (3) Myosin and Troponin (4) Troponin and Tropomyosin

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Last Answer : Actin and Myosin 

The door to your house is like the __________________ of a cell membrane? (A) Phospholipid bilayer (B) Integral protein (C) Recognition protein (D) Peripheral protein

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Last Answer : (B) Integral protein

Can two normal individuals of the same species with sexual reproduction have identical genomes and identical karyotypes ? How the human karyotype is usually represented?

Description : Can two normal individuals of the same species with sexual reproduction have identical genomes and identical karyotypes ? How the human karyotype is usually represented?

Last Answer : Except for clones (individuals created from nucleus transplantation, like the Dolly sheep) and monozygotic twins, it is very improbable the genomes of two individuals of the same species and generated by sexual ... normal karyotype is represented by the formula 44+XX for women and 44+XY for men.

What is the difference between the concepts of karyotype and genome ?

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