Which of the following makes the skin layer impervious to water? (1) Collagen (2) Melanin (3) Keratin (4) Chitin

Which of the following makes the skin layer impervious to water? (1) Collagen (2) Melanin (3) Keratin (4) Chitin
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(3) Keratin Explanation: Keratin is a family of fibrous structural proteins. Keratin is the key structural material making up the outer layer of human skin. It is also the key structural component of hair and nails. Keratin monomers assemble into bundles to form intermediate filaments, which are tough and insoluble and form strong unmineralized tissues found in reptiles, birds, amphibians, and mammals. Cells in the epidermis contain a structural matrix of keratin, which makes this outermost layer of the skin almost waterproof, and along with collagen and elastin, gives skin its strength.
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Which of the following makes the skin layer impervious to water ? (1) Collagen (2) Melanin (3) Keratin (4) Chitin

Description : Which of the following makes the skin layer impervious to water ? (1) Collagen (2) Melanin (3) Keratin (4) Chitin 

Last Answer : Keratin

The brown-black pigment of the skin that is transferred to other epidermal cells and gives the skin its color is called A. albumin B. collagen C. keratin D. melanin

Description : The brown-black pigment of the skin that is transferred to other epidermal cells and gives the skin its color is called A. albumin B. collagen C. keratin D. melanin

Last Answer : Ans: D

This major protein component of connective tissue in mammals comprises most of the organic matter of skin, tendons, bones, and teeth, and occurs as fibrous inclusions in most other body structures. Is this material: a) elastin b) collagen c) fatty acids d) keratin

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Last Answer : ANSWER: B -- collagen 

The highest concentration of cystine can be found in (A) Melanin (B) Chondroitin sulphate (C) Myosin (D) Keratin

Description : The highest concentration of cystine can be found in (A) Melanin (B) Chondroitin sulphate (C) Myosin (D) Keratin

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Of which tissue nails, hoofs and horns are made of – (1) Cuticle (2) Chitin (3) Keratin (4) Tunicin

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Last Answer : (3) Keratin Explanation: Keratin is a fibrous protein making up most cells found in our nails and hair and the epidermis layer of our skin. It also makes up fish scales and crustacean shells, bird feathers and beaks, and animal horns and hooves.

Of which tissue nails, hoofs and horns are made of (1) Cutide (2) Chitin (3) Keratin (4) Tunicin

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Last Answer : (A) Inhibitor of (i) Ricin catalytic activity

Marfan’s syndrome results from a mutation in the gene coding: (A) Collagen (B) Elastin (C) Fibrillin (D) Keratin

Description : Marfan’s syndrome results from a mutation in the gene coding: (A) Collagen (B) Elastin (C) Fibrillin (D) Keratin

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Description : Which of the following protein is rich in cysteine? (A) Elastine (B) Collagen (C) Fibrin (D) Keratin

Last Answer : Answer : D

A protein rich in cysteine is (A) Collagen (B) Keratin (C) Haemoglobin (D) Gelatin

Description : A protein rich in cysteine is (A) Collagen (B) Keratin (C) Haemoglobin (D) Gelatin

Last Answer : Answer : B

Which skin neoplasm is associated with an increase in the growth of cells in the keratin layer of the epidermis caused by pressure or friction? A. callus B. keloid C. keratosis D. leukoplakia

Description : Which skin neoplasm is associated with an increase in the growth of cells in the keratin layer of the epidermis caused by pressure or friction? A. callus B. keloid C. keratosis D. leukoplakia

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Pick up the correct statement from the following: (A) Perched aquifer is found in unconfined aquifer (B) The top surface of the water held in the perched aquifer, is known as perched water table (C) Perched aquifer is formed in unfined acquirer if an impervious layer exists (D) All the above

Description : Pick up the correct statement from the following: (A) Perched aquifer is found in unconfined aquifer (B) The top surface of the water held in the perched aquifer, is known as perched water table (C) Perched aquifer is formed in unfined acquirer if an impervious layer exists (D) All the above

Last Answer : Answer: Option D

The pigment which gives colour to the human skin is – (1) Melanin (2) Rhodopsin (3) Iodopsin (4) Anthocyanin

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Which among the following is responsible for producing color of human skin --? A. Insulin B. Vitamin K C. Melanin (Answer) D. DNA

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The pigment which gives colour to the human skin is (1) Melanin (2) Rhodopsin (3) Iodopsin (4) Anthocyanin

Description : The pigment which gives colour to the human skin is (1) Melanin (2) Rhodopsin (3) Iodopsin (4) Anthocyanin

Last Answer : Melanin

The colour of human skin is produced by (1) Haemoglobin(2) Insulin (3) Adrenaline (4) Melanin

Description : The colour of human skin is produced by (1) Haemoglobin(2) Insulin (3) Adrenaline (4) Melanin 

Last Answer : Melanin

Exine layer of pollen grain is made up of : a) sporopollenin b)Pectin c) cellulose d)chitin

Description : Exine layer of pollen grain is made up of : a) sporopollenin b)Pectin c) cellulose d)chitin

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The outer skin most of the crustaceans are made up of a carbohydrate. This carbohydrate is (1) cellulose (2) galactose (3) chitin (4) starch

Description : The outer skin most of the crustaceans are made up of a carbohydrate. This carbohydrate is (1) cellulose (2) galactose (3) chitin (4) starch

Last Answer : chitin

The major constituent of the proteins of hair and keratin of skin: (A) Arginine (B) Cysteine (C) Glycine (D) Arginine

Description : The major constituent of the proteins of hair and keratin of skin: (A) Arginine (B) Cysteine (C) Glycine (D) Arginine

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The following are true about the cornea: a. the stroma contains collagen fibrils of regular thickness b. the Bowman's layer contains randomly arranged collagen fibrils c. the Bowman's layer is the basement layer of the epithelium d. type I collagen is the main type of collagen found in the cornea

Description : The following are true about the cornea: a. the stroma contains collagen fibrils of regular thickness b. the Bowman's layer contains randomly arranged collagen fibrils c. the Bowman's layer is the ... layer of the epithelium d. type I collagen is the main type of collagen found in the cornea

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Which of the following statements is correct? (a) Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye. (b) Cornea is an external, transparent and protective proteinacious covering of the eye-ball. (c) Cornea consists of dense connective tissue of elastin and can repair itself. (d) Cornea is convex, transparent layer which is highly vascularised.

Description : Which of the following statements is correct? (a) Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye. (b) Cornea is an external, transparent and protective ... elastin and can repair itself. (d) Cornea is convex, transparent layer which is highly vascularised.

Last Answer : (a) Cornea consists of dense matrix of collagen and is the most sensitive portion of the eye.

In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is 1. a hydrophilic monomer that wets the dentinal surface 2. a hydrophilic resin that forms a ”hybrid” layer by chemically reacting the intertubular dentin. 3. a hydrophilic monomer that alters collagen to promote cross linking of collagen to dentin. 4. a bifunctional molecule resin that copolymerizes to bis-GMA resins. a. 1,2 b. 1,4 c. 2,3 d. 1,3 e. 3,4

Description : In 3rd generation dentin bonding agents, HEMA (Hydroxyethylmethacrylate) is 1. a hydrophilic monomer that wets the dentinal surface 2. a hydrophilic resin that forms a hybrid layer by chemically reacting the intertubular dentin. 3. a hydrophilic ... a. 1,2 b. 1,4 c. 2,3 d. 1,3 e. 3,4

Last Answer : b. 1,4

What exactly does a collagen cream do to my skin?

Description : What exactly does a collagen cream do to my skin?

Last Answer : Collagen cream is used to maintain a youthful appearance. Collagen creams have anti aging, anti wrinkle, and collagen holds your skin together to make you look younger.

Which of the following statement(s) is/are true concerning the remodeling phase of wound healing? a. Total collagen content increases steadily through this phase b. The normal adult ratio of collagen is approximately 4:1 of type I to type III collagen. c. Eventually a scar will achieve the strength of unwounded skin d. The proteoglycans are responsible for the ground substance of the extracellular matrix

Description : Which of the following statement(s) is/are true concerning the remodeling phase of wound healing? a. Total collagen content increases steadily through this phase b. The normal adult ratio ... unwounded skin d. The proteoglycans are responsible for the ground substance of the extracellular matrix

Last Answer : Answer: b, d The transition from the proliferative phase to the remodeling phase of wound healing is defined by reaching collagen equilibrium. Collagen accumulation within the wound becomes maximal by ... in strength for six months or more, eventually reaching 70% of the strength of unwounded skin

Which of the following is/are true? A. Because of its thickness, the tensile strength of a healing wound on the eyelid is much less than one on the thick skin of the back. B. By 2 days, the experimental burst strength of skin is minimal since collagen has been formed in the wound but has not yet cross-linked. C. Wound strength reaches a plateau by 3 weeks. D. Wounds rarely, if ever, regain the strength of intact tissues.

Description : Which of the following is/are true? A. Because of its thickness, the tensile strength of a healing wound on the eyelid is much less than one on the thick skin of the back. B. By 2 days, ... strength reaches a plateau by 3 weeks. D. Wounds rarely, if ever, regain the strength of intact tissues.

Last Answer : Answer: BD DISCUSSION: Tensile strength measures load per cross-section area at rupture, whereas burst strength measures load required to break a wound, regardless of dimension. Therefore, skin wounds have ... a slower rate for more than a year. Wounds do not regain the strength of normal tissue

In contrast to adult wound healing with scar formation, which of the following are characteristic of scarless fetal skin repair? A. Matrix rich in hyaluronic acid. B. Increased inflammatory response. C. Increased production of TGF-b. D. No collagen deposition. E. Minimal angiogenesis.

Description : In contrast to adult wound healing with scar formation, which of the following are characteristic of scarless fetal skin repair? A. Matrix rich in hyaluronic acid. B. Increased inflammatory response. C. Increased production of TGF-b. D. No collagen deposition. E. Minimal angiogenesis.

Last Answer : Answer: AE DISCUSSION: The ability of a fetus to heal without scar formation depends on its gestational age at the time of injury and the size of the wound defect. In ... repair has possible clinical applications in the modulation of adult fibrotic diseases and abnormal scar-forming conditions

Which of the following connective tissue disorders is characterized by insoluble collagen being formed and accumulating excessively in the tissues? a) Scleroderma Scleroderma occurs initially in the skin but also occurs in blood vessels, major organs, and body systems, potentially resulting in death.

Description : Which of the following connective tissue disorders is characterized by insoluble collagen being formed and accumulating excessively in the tissues? a) Scleroderma Scleroderma occurs initially in the ... In polymyalgia rheumatic, immunoglobulin is deposited in the walls of inflamed temporal arteries.

Last Answer : a) Scleroderma Scleroderma occurs initially in the skin but also occurs in blood vessels, major organs, and body systems, potentially resulting in death.

Which one among the following is not a reason for practising tank irrigation in the Peninsular India? [NDA 2011] (a) The undulating relief and hard rocks (b) little percolation of rain water due to impervious rock structure (c) Most of the rivers of Peninsular India are perennial (d) There are many streams which become torrential during rainy season

Description : Which one among the following is not a reason for practising tank irrigation in the Peninsular India? [NDA 2011] (a) The undulating relief and hard rocks (b) little percolation of rain ... of Peninsular India are perennial (d) There are many streams which become torrential during rainy season

Last Answer : Ans: (c)

An aquiclude is (A) A non artesian aquifer (B) An artesian aquifer (C) A confined bed of impervious material between aquifers (D) A large water body underground

Description : An aquiclude is (A) A non artesian aquifer (B) An artesian aquifer (C) A confined bed of impervious material between aquifers (D) A large water body underground

Last Answer : (C) A confined bed of impervious material between aquifers

Pick up the correct statement from the following: (A) A confined bed of impervious material laid over an aquifer, is known as an aquiclude (B) The top most water bearing strata having no aquifer, is known as non-artesian aquifer (C) The ordinary gravity wells which supply water from the top most water bearing strata, are called water table wells (D) All the above

Description : Pick up the correct statement from the following: (A) A confined bed of impervious material laid over an aquifer, is known as an aquiclude (B) The top most water bearing strata having no aquifer, is ... water from the top most water bearing strata, are called water table wells (D) All the above

Last Answer : Answer: Option D

Why are kernels of corn so impervious to the digestive process?

Description : Why are kernels of corn so impervious to the digestive process?

Last Answer : They are cellulose.Cellulose is not digestible by humans. It is by cows.

What animal is impervious to the venom of a poisonous dart frog?

Description : What animal is impervious to the venom of a poisonous dart frog?

Last Answer : My mother-in-law…

Coating of solid waste with impervious material is known as – (1) Encapsulation (2) Chemical fixation (3) Landfill (4) Capping

Description : Coating of solid waste with impervious material is known as – (1) Encapsulation (2) Chemical fixation (3) Landfill (4) Capping

Last Answer : (1) Encapsulation Explanation: Containment of toxic or hazardous constituents in industrial solid wastes is currently being accomplished using: (i) coating grains of waste material with an ... coating blocks of waste material with an inert, non-reactive impervious material (macroencapsulation).

Stone ware pipes are A. Highly resistant to sulphide corrosion B. Highly impervious C. Hydraulically efficient because of their smooth interior surface D. Especially suited to pressure pipes

Description : Stone ware pipes are A. Highly resistant to sulphide corrosion B. Highly impervious C. Hydraulically efficient because of their smooth interior surface D. Especially suited to pressure pipes

Last Answer : ANS: D

Which of the following additives are added to plastics to make it impervious to X-rays? (A) Asbestos (B) Barium salt (C) Carborundum (D) Phthalic acid

Description : Which of the following additives are added to plastics to make it impervious to X-rays? (A) Asbestos (B) Barium salt (C) Carborundum (D) Phthalic acid

Last Answer : (B) Barium salt

The tank irrigation is more popular in peninsular plateau because of, A. There are hard and impervious rocks. B. Undulating land. C. Most of the rivers are seasonal in that region. D. All the above.

Description : The tank irrigation is more popular in peninsular plateau because of, A. There are hard and impervious rocks. B. Undulating land. C. Most of the rivers are seasonal in that region. D. All the above.

Last Answer : D. All the above.

Ozone is (A) A primary pollutant (B) A secondary pollutant (C) Impervious to ultra-violet rays (D) Both (B) and (C)

Description : Ozone is (A) A primary pollutant (B) A secondary pollutant (C) Impervious to ultra-violet rays (D) Both (B) and (C)

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If there is no impervious boundary at the bottom of a hydraulic structure, stream lines tend to follow: (A) A straight line (B) A parabola (C) A semi-ellipse (D) A semi-circle

Description : If there is no impervious boundary at the bottom of a hydraulic structure, stream lines tend to follow: (A) A straight line (B) A parabola (C) A semi-ellipse (D) A semi-circle

Last Answer : (C) A semi-ellipse

A structure is erected on an impervious clay whose thickness is 12 m. Drainage is possible both at upper and lower surfaces. Coefficient of consolidation is 0.015 cm2 per minute. For attaining 50% consolidation with a time factor 0.20, the number of days required (A) 3233 (B) 3123 (C) 33331 (D) 3313

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Last Answer : Answer: Option C

Seepage through foundation in an earthen dam is controlled by providing (A) Rock toe (B) Horizontal blanket (C) Impervious cut off (D) Chimney drain

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Last Answer : Answer: Option C

The most suitable material for the central impervious core of a zoned embankment type dam is (A) Clay (B) Coarse sand (C) Silty clay (D) Clay mixed with fine sand

Description : The most suitable material for the central impervious core of a zoned embankment type dam is (A) Clay (B) Coarse sand (C) Silty clay (D) Clay mixed with fine sand

Last Answer : Answer: Option D

Glazing is used to make earthenware (A) Hard (B) Soft (C) Porous (D) Impervious

Description : Glazing is used to make earthenware (A) Hard (B) Soft (C) Porous (D) Impervious

Last Answer : Answer: Option D

Pick up the correct statement from the following: (A) D.P.C. should be continuous (B) D.P.C. should be of good impervious material (C) D.P.C. may be horizontal or vertical (D) All the above

Description : Pick up the correct statement from the following: (A) D.P.C. should be continuous (B) D.P.C. should be of good impervious material (C) D.P.C. may be horizontal or vertical (D) All the above

Last Answer : Option D

Coating of solid waste with impervious material is known as (1) Encapsulation (2) Chemical fixation (3) Landfill (4) Capping

Description : Coating of solid waste with impervious material is known as (1) Encapsulation (2) Chemical fixation (3) Landfill (4) Capping

Last Answer : Encapsulation

What is Melanin ?

Description : What is Melanin ?

Last Answer : Melanin is a type of pigment. It is located under human skin and determines the color of human skin. If the amount of melanin is high then the color of the skin becomes black and if the amount is low ... pale. The amount of melanin in the body can be controlled to some extent if away from the sun.

What is the main function of melanin in the body ?

Last Answer : The main function of melanin in the body is to protect the body from the harmful effects of sunlight.

Melanin pigment protects from which of the following radiations ?

Description : Melanin pigment protects from which of the following radiations ?

Last Answer : Melanin pigment protects from which of the following radiations ? A. X-rays B. Infra-red rays C. Visible rays D. UV rays