Description : Rhodopsin contains opsin and (A) 11-cis-retinal (B) 11-trans-retinal (C) All-cis-retinal (D) All trans-retinal
Last Answer : Answer : A
Description : Prosthetic group in cone cell phototreceptors is (A) Iodine (B) Opsin (C) 11-cis-retinal (D) all-trans-retinal
Last Answer : Answer : C
Description : On exposure to light rhodopsin forms (A) All trans-retinal (B) Cis-retinal (C) Retinol (D) Retinoic acid
Description : Conversion of all-trans-retinal into alltrans-retinol requires (A) NAD (B) NADH (C) NADP (D) NADPH
Last Answer : Answer : D
Description : Retina contains this photo sensitive pigment. (A) Rhodopsin (B) Opsin (C) Retinol (D) Malanin
Description : Which of the following statements regarding Vitamin A is true? (A) It is not an essential Vitamin (B) It is related to tocopherol (C) It is a component of rhodopsin (D) It is also known as Opsin
Description : Retina contains this photosensitive pigment: (A) Rhodopsin (B) Opsin (C) Retinol (D) Melanin
Description : Photosensitive compound in human eye is made up of (a) opsin and retinol (b) transducin and retinene (c) guanosine and retinol (d) opsin and retinal.
Last Answer : (d) opsin and retinal.
Description : The following are true about dark adaptation: a. only regeneration of rhodopsin is responsible b. adaptation usually takes about 20 minutes c. dilatation of pupil plays a part in dark adaptation d. it is better with the fovea than the peripheral retina
Last Answer : dilatation of pupil plays a part in dark adaptation
Description : The non-protein part of rhodopsin is (A) Retinal (B) Retinol (C) Carotene (D) Repsin
Description : Retinal is a component of (A) Iodopsin (B) Rhodopsin (C) Cardiolipin (D) Glycoproteins
Last Answer : Answer : B
Description : Non-protein part of rhodopsin is (A) Retinal (B) Retinol (C) Carotene (D) Repsin
Description : When a photon strikes the rhodopsin: a. bleaching occurs b. retinal molecules are bound to rhodopsin c. the intracellular cGMP is increased d. the sodium ion channels are closed
Last Answer : the sodium ion channels are closed
Description : Which one of the following statements is not correct? (a) Retinal is the light absorbing portion of visual photopigments. (b) In retina the rods have the photopigment rhodopsin while cones have three ... a derivative of vitamin C. (d) Rhodopsin is the purplish red protein present in rods only.
Last Answer : (c) Retinal is a derivative of vitamin C.
Description : Rod cells possess a trans-membrane protein which is (A) Adenylate cyclase (B) Transducin (C) Rhodopsin (D) B as well as C
Description : Retinal is reduced to retinol by retinene reductase in presence of the coenzyme (A) NAD+ (B) NADP+ (C) NADH + H+ (D) NADPH + H+
Description : Conversion of retinal into ritonal requires the presence of (A) NADH (B) NADPH (C) FADH2 (D) Lipoic acid
Description : Retinol and retinal are interconverted requiring dehydrogenase or reductase in the presence of (A) NAD or NADP (B) NADH + H+ (C) NADPH (D) FAD
Description : Retinal is reduced to retinol in intestinal mucosa by a specific retinaldehyde reductase utilising (A) NADPH + H+ (B) FAD (C) NAD (D) NADH + H+
Description : When light falls on rod cells (A) All-cis-retinal is converted into all-trans-retinal (B) 11-cis-retinal is converted into 11-trans-retinal (C) 11-trans-retinal is converted into all-transretinal (D) 11-cis-retinal is converted into all-trans-retinal
Description : The retinal pigment epithelium (RPE): a. is sensitive to hypervitaminosis A b. isomerizes all-trans-retinal to 11-cis-retinol c. does not undergo mitosis in response to injury d. secrets the outer layer of the basal lamina that forms the Bruch's membrane.
Last Answer : isomerizes all-trans-retinal to 11-cis-retinol
Description : During phototransduction: a. hyperpolarisation occurs due to closure of the sodium channels b. 11-cis-retinal molecules are converted to all-trans-retinal c. transducin, a G protein converts GDP to GTP d. all above
Last Answer : all above
Description : Erythrocytes under normal conditions and microorganisms under anaerobic conditions may accumulate (A) NADPH (B) Pyruvate (C) Phosphoenolpyruvate (D) Lactate
Description : The following coenzyme is required for catabolism of pyrimidine bases: (A) NADH (B) NADPH (C) FADH2 (D) None of these
Description : A soluble system for synthesis of fatty acids have been isolated from avian liver, required for the formation of long chain fatty acids by this system is (A) ATP (B) Acetyl CoA (C) NADPH (D) All of these
Description : NADPH required for fatty acid synthesis can come from (A) Hexose monophosphate shunt (B) Oxidative decarboxylation of malate (C) Extramitochondrial oxidation of isocitrate (D) All of these
Description : For synthesis of sphingosine, all the following coenzymes are required except (A) Pyridoxal phosphate (B) NADPH (C) FAD (D) NAD
Description : Which of the following is required as a reductant in fatty acid synthesis? (A) NADH (B) NADPH (C) FADH2 (D) FMNH2
Description : Tissues are constructed from many distinct cell types that perform different functions in response to signals from each other and the extracellular matrix. During tissue development and tissue regeneration, ... that stem cells undergo when they are required to generate a particular type of cell?
Last Answer : Asymmetric cell division. After asymmetric division, each of the two resulting daughter cells has a unique life course. For example, one daughter cell may differentiate into a specific cell type ( ... cell), whereas the other daughter cell may remain a stem cell with unlimited proliferative ability.
Description : Is the same amount of energy that is lost in splitting an atom, required to put one together?
Last Answer : Atoms condensed from the plasma that followed the Big Bang, and the matter that composed the plasma condensed from the pure energy released from the Big Bang. Stars do produce new atoms, but ... relatively slowly, which means a lot of energy would be spent opposing the Strong Nuclear Force.
Description : A person deficient in Rhodopsin (visual pigment) should take -
Last Answer : A person deficient in Rhodopsin (visual pigment) should take - A. Tomatoes B. Radish C. Carrots D. Guavas
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.
Description : The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of the human eye, is a derivative of
Last Answer : The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of the human eye, is a ... Vitamin B 1 C. Vitamin C D. Vitamin D
Description : cAMP is so called because it is formed during (A) TCA cycle (B) Urea cycle (C) Rhodopsin cycle (D) It has a cyclic structure
Description : Retinoic acid is involved in the synthesis of (A) Rhodopsin (B) Iodopsin (C) Porphyrinopsin (D) Glycoproteins
Description : Retinoic acid participates in the synthesis of (A) Iodopsin (B) Rhodopsin (C) Glycoprotein (D) Cardiolipin
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.
Description : The ability of the eye to see in the dark, is due to the production of a purple pigment known as (1) Carotene (2) Rhodopsin (3)Iodopsin (4) Retinene
Last Answer : (4) Retinene Explanation: Retinene-1 is better known as retinaldehyde or simply retinal and is fundamental in the transduction of light into visual signals in the photoreceptor level of the retina (known as the visual cycle). Retinene-2 is more formally known as dehydroretinaldehyde.
Description : The ability of the Eye to see in the dark, is due to the production of a purple pigment known as----? A. Carotene B. Rhodopsin C. Iodopsin D. Retinene (Answer)
Last Answer : D. Retinene (Answer)
Description : Rhodopsin: a. is a red pigment b. is least sensitive to red light c. is regenerated when the eyes are closed d. all above
Description : Which of the following receptors does not span the cell membrane 7 times a. β-Adrenergic receptor b. Rhodopsin c. 5-HTic receptor d. Mineralocorticoid receptor
Last Answer : Mineralocorticoid receptor
Description : Which one of the following pairs of chemical substances, is correctly categorised? (a) Calcitonin and thymosin - Thyroid hormones (b) Pepsin and prolactin - Two digestive enzymes secreted in ... and myosin - Complex proteins in striated muscles (d) Secretin and rhodopsin - Polypeptide hormones
Last Answer : (c) Troponin and myosin - Complex proteins in striated muscles
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
Description : Which one of the following is the correct difference between rod cells and cone cells of our retina? Rod cells Cone cells (a) Overall Vision in poor Colour vision function light and detailed ... of retina all over retina (c) Visual acuity High Low (d) Visual pigment Iodopsin Rhodopsin contained
Last Answer : (a) Overall Vision in poor Colour vision function
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
Description : Which food should be eaten during deficiency of rhodopsin in eyes? (a) Carrot and ripe papayas (b) Guava, banana (c) Mango and potato (d) None of the above
Last Answer : (a) Carrot and ripe papayas
Description : Vitamin A is responsible for (a) Rhodopsin (b) Night blindness (c) Pellagra (d) Cirrhosis
Last Answer : (a) Rhodopsin
Description : The pigment which gives colour to the human skin is (1) Melanin (2) Rhodopsin (3) Iodopsin (4) Anthocyanin
Last Answer : Melanin
Description : The ability of the eye to see in the dark, is due to the production of a purple pigment known as (1) Carotene (2) Rhodopsin (3) Iodopsin (4) Retinene
Last Answer : Retinene
Description : Name the given reaction and enzyme involved in it. `alpha`-etoglutaric acid `+NH_(4)^(+)+NADPH overset("Enzyme")to"glutamate"+H_(2)O+NADP`
Last Answer : Name the given reaction and enzyme involved in it. `alpha`-etoglutaric acid `+NH_(4)^(+)+NADPH overset("Enzyme")to"glutamate"+H_(2)O+NADP`