The following points about microfilaments are true except (A) They form cytoskeleton with microtubules (B) They provide support and shape (C) They form intracellular conducting channels (D) They are involved in muscle cell contraction

The following points about microfilaments are true except (A) They form cytoskeleton with microtubules (B) They provide support and shape (C) They form intracellular conducting channels (D) They are involved in muscle cell contraction
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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

Microfilaments may assist a. in the movement of fibroblasts in heart b. growth of axons c. contraction of all muscle d. all

Description : Microfilaments may assist a. in the movement of fibroblasts in heart b. growth of axons c. contraction of all muscle d. all

Last Answer : all

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.

Which one is apparato reticolare? (a) Golgi apparatus (b) Endoplasmic reticulum (c) Microfilaments (d) Microtubules

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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.

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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

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The most probable mechanism of action of mebendazole is: A. Depolarization of membrane and spastic paralysis of the worm B. Hyperpolarization of membrane and flaccid paralysis of the worm C. Loss of intracellular microtubules and inhibition of glucose uptake in the worm D. Tegument damage and leakage of contents of the worm

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Which of the following statements is not correct? (a) An action potential in an axon does not move backward because the segment behind is in a refractory phase. (b) Depolarisation of hair cells of cochlea results in the opening of the mechanically gated potassium-ion channels. (c) Rods are very sensitive and contribute to daylight vision. (d) In the knee-jerk reflex, stimulus is the stretching of muscle and response is its contraction.

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Microtubule is involved in the (a) muscle contraction (b) membrane architecture (c) cell division (d) DNA recognition

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An elaborate network of filamentous proteinaceous structures present in the cytoplasm which helps in the maintenance of cell shape is called (a) thylakoid (b) endoplasmic reticulum (c) plasmalemma (d) cytoskeleton.

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Last Answer : Answer : D

Depolarizing neuromuscular blockers differ from competitive blockers in the following attributes except: A. They induce contraction of isolated frog rectus abdominis muscle B. Ether anaesthesia intensifies block produced by them C. Tetanic nerve stimulation during partial depolarizing block produces well sustained contraction D. Neostigmine does not reverse block produced by them

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What are the functions of potassium? (A) In muscle contraction (B) Cell membrane function (C) Enzyme action (D) All of these

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A mouse cell is treated with a chemical that interferes with the activity of microfilaments. Which of the following will probably be affected the most

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Organic nitrates relax vascular smooth muscle by: A. Increasing intracellular cyclic GMP B. Increasing intracellular cyclic AMP C. Decreasing intracellular cyclic AMP D. Both ‘A’ and ‘C’ are correct

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In heart cells, which of the following serves as a secondary messenger, speeding up muscle cell contraction in response to adrenaline ?

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Which one of the following describes the mode of action of tetanospasmin? a. It inhibits muscle contraction. b. It damages and lyses red blood cells. c. It disrupts cell tissues. d. It inhibits muscle relaxation.

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One of the following statements about muscular responses is not true. Choose that one (a) A muscle fibre contracts in all-or-none fashion (b) There is a slight latent period that occurs between when the stimulus arrives at the muscle and when a muscle contracts. (c) Muscles will add motor units to a contraction, increasing the overall force of contraction (d) When a person is fully at rest, none of the muscles are contracting in the body

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The following are true: a. Kirschman's law: the greatest contrast in colour is seen when the luminosity differnece is small b. Emmbert's law: the perceived size of an object varies in proportion to the distance of the surface on which it is projected c. Hering's law: the contraction of a muscle is accompanied by simultaneous and proportional relaxation of the antagonist d. Troxler's phenomenon: an image in the periphery of the retina tends to fade or disappear during steady fixation of another objec

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The following are true about potassium: a. hypokalaemia decreases the time of cardiac repolarization b. hyperkalaemia decreases cardiac contraction c. hyperkalaemia relaxes vascular smooth muscle d. all

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The following are true about the smooth muscle cells: a. presence of a striated appearance b. do not contain actin and myosin c. spontaneous muscle contraction d. mitochondria are absent

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The following are true about the smooth muscle cells: a. presence of a striated appearance b. do not contain actin and myosin c. spontaneous muscle contraction d. mitochondria are absent

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The mean intracellular concentration of ATP in mammalian cell is about (A) 1 mM (B) 2 mM (C) 0.1 mM (D) 0.2 mM

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Prostaglandins decrease all of the following except (A) Gastric acid secretion (B) Blood pressure (C) Uterine contraction (D) Platelet aggregation

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As an antitubercular drug, isoniazid has the following advantages except: A. It is tuberculocidal B. It acts on both extra and intracellular bacilli C. Tubercle bacilli do not develop resistance against it D. It is cheap

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All of the following subserve as intracellular second messengers in receptor mediated signal transduction except: A. Cyclic AMP B. Inositol trisphosphate C. Diacyl glycerols D. G proteins

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All of the following subserve as intracellular second messengers in receptor mediated signal transduction except: A. Cyclic AMP B. Inositol trisphosphate C. Diacyl glycerols D. G proteins

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Muscle relaxants can be used for which of the following? A. To facilitate intubation. B. To provide optimal surgical conditions. C. To optimize ventilator support. D. To provide sedation.

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Exoskeletons DO NOT provide: a) sites for muscle attachment b) support for the organism c) unlimited growth potential d) protection of the organism

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Vitamin A over dosage causes injury to (A) Mitochondria (B) Microtubules (C) Lysosomes (D) E.R

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All statements regarding 3-OH-3 methyl glutaryl CoA are true except (A) It is formed in the cytoplasm (B) Required in ketogenesis (C) Involved in synthesis of Fatty acid (D) An intermediate in cholesterol biosynthesis

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Last Answer : Answer : B

When were microfilaments discovered? -Biology

Description : When were microfilaments discovered? -Biology

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Difference between microfilaments and intermediate filaments? -Biology

Description : Difference between microfilaments and intermediate filaments? -Biology

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When were microfilaments discovered? -Biology

Description : When were microfilaments discovered? -Biology

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