Melanin pigment protects from which of the following radiations ?

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

Description : Melanin protects from

Last Answer : Melanin protects from A. UV rays B. Visible rays C. Infrared rays D. X-rays

Retina contains this photosensitive pigment: (A) Rhodopsin (B) Opsin (C) Retinol (D) Melanin

Description : Retina contains this photosensitive pigment: (A) Rhodopsin (B) Opsin (C) Retinol (D) Melanin

Last Answer : Answer : A

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

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 : (1) Melanin Explanation: Human skin color is primarily due to the presence of melanin in the skin. Skin color ranges from almost black to white with a pinkish tinge due to blood vessels underneath. In animals melanin pigments are derivatives of the amino acid tyrosine.

True statements about chloroquine include: a. is safer than hydroxychloroquine at equivalent dose b. can cause corneal deposition c. causes posterior subcapsular cataract d. chloroquine is bound to the melanin of the retinal pigment epithelium e. causes reversible toxic maculopathy

Description : True statements about chloroquine include: a. is safer than hydroxychloroquine at equivalent dose b. can cause corneal deposition c. causes posterior subcapsular cataract d. chloroquine is bound to the melanin of the retinal pigment epithelium e. causes reversible toxic maculopathy

Last Answer : can cause corneal deposition

Hormones thyroxine, adrenaline and the pigment melanin are formed from (a) tyrosine (b) proline (c) tryptophan (d) glycine.

Description : Hormones thyroxine, adrenaline and the pigment melanin are formed from (a) tyrosine (b) proline (c) tryptophan (d) glycine.

Last Answer : (a) tyrosine

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

Which pigment protects plants from UV damage ?

Description : Which pigment protects plants from UV damage ?

Last Answer : Which pigment protects plants from UV damage ? A. Chlorophyll B. Xanthophyll C. Carotenoids D. Phycocyanin.

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.

MSH causes (A) Dispersal of melanin granules in melanocytes (B) Increase in melanin concentration in melanocytes (C) Decerease in melanin concentration in melanocytes (D) Increase in number of melanocytes

Description : MSH causes (A) Dispersal of melanin granules in melanocytes (B) Increase in melanin concentration in melanocytes (C) Decerease in melanin concentration in melanocytes (D) Increase in number of melanocytes

Last Answer : Answer : B

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

Last Answer : Answer : D

Formation of melanin from tyrosine requires the action of (A) Dopa decarboxylation (B) Diamine oxidase (C) Peroxidase (D) Tyrosinase

Description : Formation of melanin from tyrosine requires the action of (A) Dopa decarboxylation (B) Diamine oxidase (C) Peroxidase (D) Tyrosinase

Last Answer : Answer : D

DOPA is an intermediate in the synthesis of (A) Thyroid hormones (B) Catecholamines (C) Melanin (D) Catecholamines and melanin

Description : DOPA is an intermediate in the synthesis of (A) Thyroid hormones (B) Catecholamines (C) Melanin (D) Catecholamines and melanin

Last Answer : Answer : D

All the following statements about phenylketonuria are correct except (A) Phenylalanine cannot be converted into tyrosine (B) Urinary excretion of phenylpyruvate and phenyllactate is increased (C) It can be controlled by giving a lowphenylalanine diet (D) It leads to decreased synthesis of thyroid hormones, catecholamines and melanin

Description : All the following statements about phenylketonuria are correct except (A) Phenylalanine cannot be converted into tyrosine (B) Urinary excretion of phenylpyruvate and phenyllactate is increased (C) It ... diet (D) It leads to decreased synthesis of thyroid hormones, catecholamines and melanin

Last Answer : Answer : D

Tryptophan could be considered as precursor of (A) Melanotonin (B) Thyroid hormones (C) Melanin (D) Epinephrine

Description : Tryptophan could be considered as precursor of (A) Melanotonin (B) Thyroid hormones (C) Melanin (D) Epinephrine

Last Answer : Answer : A

The fo l low ing substances are ce l l inclusions except (A) Melanin (B) Glycogen (C) Lipids (D) Centrosome

Description : The fo l low ing substances are ce l l inclusions except (A) Melanin (B) Glycogen (C) Lipids (D) Centrosome

Last Answer : D

Grey hair is caused due to – (1) aging of epidermal cells (2) death of dermal cells (3) loss of sebum in epidermal cells (4) loss of melanin in epidermal cells

Description : Grey hair is caused due to – (1) aging of epidermal cells (2) death of dermal cells (3) loss of sebum in epidermal cells (4) loss of melanin in epidermal cells

Last Answer : (4) loss of melanin in epidermal cells Explanation: loss of melanin in epidermal cells.

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 : (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 ... layer of the skin almost waterproof, and along with collagen and elastin, gives skin its strength.

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

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

Last Answer : C. Melanin (Answer)

In the chemistry of vision in mammals, the photosensitive substance is called (a) rhodopsin (b) melanin (c) sclerotin (d) retinol.

Description : In the chemistry of vision in mammals, the photosensitive substance is called (a) rhodopsin (b) melanin (c) sclerotin (d) retinol.

Last Answer : (a) rhodopsin

Mast cells of connective tissue contain (a) vasopressin and relaxin (b) heparin and histamine (c) heparin and calcitonin (d) serotonin and melanin.

Description : Mast cells of connective tissue contain (a) vasopressin and relaxin (b) heparin and histamine (c) heparin and calcitonin (d) serotonin and melanin.

Last Answer : (b) heparin and histamine

Grey hair is caused due to (1) aging of epidermal cells (2) death of dermal cells (3) loss of sebum in epidermal cells (4) loss of melanin in epidermal cells

Description : Grey hair is caused due to (1) aging of epidermal cells (2) death of dermal cells (3) loss of sebum in epidermal cells (4) loss of melanin in epidermal cells

Last Answer : loss of melanin in epidermal cells

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

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

A black surface absorbs more heat radiations as compared to a white or a reflecting surface under identical conditions. List two solar devices which make use of this property in their design. -Science

Description : A black surface absorbs more heat radiations as compared to a white or a reflecting surface under identical conditions. List two solar devices which make use of this property in their design. -Science

Last Answer : Solar cooker, solar water heater.

Which of these radiations is used to study the black hole? -Space

Description : Which of these radiations is used to study the black hole? -Space

Last Answer : When our eyes look at the heavens we see the visible light from stars and other objects in the Universe. Thousands of years ago astronomers in Greece and other ancient cultures already built a detailed ... . We encounter radio waves often in our daily lives, for example in radios and cell phones.

Which human organ is most susceptible to harmful radiations? -Do You Know?

Description : Which human organ is most susceptible to harmful radiations? -Do You Know?

Last Answer : answer:

Which of the following pails constitute very similar radiations

Description : Which of the following pails constitute very similar radiations

Last Answer : Which of the following pails constitute very similar radiations A. Hard ultraviolet rays and solft X-ray B. Soil ... y-rays D. soft X-roys and y-rays

When more than one adaptive radiations appear in an isolated geographical area, thatn it is called.

Description : When more than one adaptive radiations appear in an isolated geographical area, thatn it is called.

Last Answer : When more than one adaptive radiations appear in an isolated geographical area, thatn it ... C. Divergent evlution D. Retrogressive evolution

Exposure of UV radiations causes

Description : Exposure of UV radiations causes

Last Answer : Exposure of UV radiations causes A. Formation of thyamine dimers B. Addition of base pairs C. Deletion of base pairs D. Methylation of bases.

Which is correct about statements X and Y statement X. DDT shows biological magnification Statement Y : UV radiations causes ozone depletion .

Description : Which is correct about statements X and Y statement X. DDT shows biological magnification Statement Y : UV radiations causes ozone depletion .

Last Answer : Which is correct about statements X and Y statement X. DDT shows biological magnification Statement Y : UV ... D. X is not correct, Y is correct.

Ultraviolet radiations from sunlight causes a reaction that produces:

Description : Ultraviolet radiations from sunlight causes a reaction that produces:

Last Answer : Ultraviolet radiations from sunlight causes a reaction that produces: A. Ozone B. `SO_(2)` C. CO D. Fluorides

UV radiations bring about

Description : UV radiations bring about

Last Answer : UV radiations bring about A. skin cancers B. Mouth cancer C. Lung cancer D. Liver cancer

Ultraviolet radiations from sunlight causes a reaction that produces:

Description : Ultraviolet radiations from sunlight causes a reaction that produces:

Last Answer : Ultraviolet radiations from sunlight causes a reaction that produces: A. `O_(3)` B. `SO_(2)` C. CO D. `CH_(4)`

UV radiations in the stratosphere are absorbed by

Description : UV radiations in the stratosphere are absorbed by

Last Answer : UV radiations in the stratosphere are absorbed by A. Oxygen B. ozone C. sulphur dioxide D. Argon.

Earth is protected from ultra-violet radiations by means of

Description : Earth is protected from ultra-violet radiations by means of

Last Answer : Earth is protected from ultra-violet radiations by means of A. Ozone layer B. nitrogen C. oxygen D. carbon dioxides

An animal that uses ultra-violet radiations for locating food and boundary of its territory is

Description : An animal that uses ultra-violet radiations for locating food and boundary of its territory is

Last Answer : An animal that uses ultra-violet radiations for locating food and boundary of its territory is A. desert ... desert frog C. kangaroo rat D. sea snake.

Exposure of UV radiations causes

Description : Exposure of UV radiations causes

Last Answer : Exposure of UV radiations causes A. Damage to eye sight B. Sunburn C. Skin cancer D. All the above

Exposure of UV radiations causes

Description : Exposure of UV radiations causes

Last Answer : Exposure of UV radiations causes A. Damage to eye sight B. Sunburn C. Skin cancer D. All the above

Non-ionising radiations damaging to DNA are

Description : Non-ionising radiations damaging to DNA are

Last Answer : Non-ionising radiations damaging to DNA are A. X-rays B. U.V. rays C. Gamma rays D. Beta rays

Ultraviolet radiations produce the photo oxidant

Description : Ultraviolet radiations produce the photo oxidant

Last Answer : Ultraviolet radiations produce the photo oxidant A. `SO_(2)` B. Flouride C. CO D. `O_(3)`

A freshely prepared radioactive source of half 2 hours emits radiations of intensity which is 64 times the permissible safe level. The minimum time af

Description : A freshely prepared radioactive source of half 2 hours emits radiations of intensity which is 64 times the permissible safe level. The minimum time af

Last Answer : A freshely prepared radioactive source of half 2 hours emits radiations of intensity which is 64 times the ... 12 hours C. 24 hours D. 48 hours

The alpha particles are A)High`-` energy electrons B)Positively charged hydrogen ions C) High`-` energy `X-` rays radiations D)Double positively charg

Description : The alpha particles are A)High`-` energy electrons B)Positively charged hydrogen ions C) High`-` energy `X-` rays radiations D)Double positively charg

Last Answer : The alpha particles are A)High`-` energy electrons B)Positively charged hydrogen ions C) ... ray radiations D. double positively charged helium nuclei

which of the following radiations have least effect on both the photographic plate and zinc sulphide screen?

Description : which of the following radiations have least effect on both the photographic plate and zinc sulphide screen?

Last Answer : which of the following radiations have least effect on both the photographic plate and zinc sulphide ... `gamma-decays D. All have equal effect

Which, of the following radiations has the least wavelength?

Description : Which, of the following radiations has the least wavelength?

Last Answer : γ – rays

The radiations emitted by the sun and responsible for the cause of skin cancer

Description : The radiations emitted by the sun and responsible for the cause of skin cancer

Last Answer : Ans. Ultra-violet

Which of the following types radiations is absorbed by the upper layer of the atmosphere? A. Radio-waves B. Infrared C. Visible D. Ultraviolet

Description : Which of the following types radiations is absorbed by the upper layer of the atmosphere? A. Radio-waves B. Infrared C. Visible D. Ultraviolet

Last Answer : ANSWER: B

The ultra violet radiations of the Sun do not reach the Earth because the upper layers of the atmosphere contain (a) oxygen (b) helium (c) ozone (d) hydrogen

Description : The ultra violet radiations of the Sun do not reach the Earth because the upper layers of the atmosphere contain (a) oxygen (b) helium (c) ozone (d) hydrogen

Last Answer : Ans:(c)

The increasing amount of CO2 in the atmosphere is slowly raising its temperature because it absorbs (a) the infrared part of the solar radiation (b) the ultraviolet part of the solar radiation (c) all the solar radiations (d) the water vapour of the air

Description : The increasing amount of CO2 in the atmosphere is slowly raising its temperature because it absorbs (a) the infrared part of the solar radiation (b) the ultraviolet part of the solar radiation (c) all the solar radiations (d) the water vapour of the air

Last Answer : Ans:(a)