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

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
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Answer : D
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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

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

Prosthetic group in cone cell phototreceptors is (A) Iodine (B) Opsin (C) 11-cis-retinal (D) all-trans-retinal

Description : Prosthetic group in cone cell phototreceptors is (A) Iodine (B) Opsin (C) 11-cis-retinal (D) all-trans-retinal

Last Answer : Answer : C

Rhodopsin contains opsin and (A) 11-cis-retinal (B) 11-trans-retinal (C) All-cis-retinal (D) All trans-retinal

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Last Answer : Answer : A

On exposure to light rhodopsin forms (A) All trans-retinal (B) Cis-retinal (C) Retinol (D) Retinoic acid

Description : On exposure to light rhodopsin forms (A) All trans-retinal (B) Cis-retinal (C) Retinol (D) Retinoic acid

Last Answer : Answer : A

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.

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Last Answer : isomerizes all-trans-retinal to 11-cis-retinol

Rod: a. contains a cilium with a "9+0" configuration. b. contains 11-trans-retinaldehyde essential for the absorption of photons c. sheds its outer segment during the day d. depolarize in response to flashes of light

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Last Answer : contains a cilium with a "9+0" configuration.

The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone respons

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Last Answer : he a-wave is produced by the photoreceptors

The following are true about electroretinogram: a. the a-wave is produced by the photoreceptors b. the b-wave is produced by the ganglion cells c. c-wave is produced by the retinal pigment epithelium d. different light frequencies can be used to separate rod and cone response

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Last Answer : the a-wave is produced by the photoreceptors

Rod cells possess a trans-membrane protein which is (A) Adenylate cyclase (B) Transducin (C) Rhodopsin (D) B as well as C

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Last Answer : Answer : C

Conversion of all-trans-retinal into alltrans-retinol requires (A) NAD (B) NADH (C) NADP (D) NADPH

Description : Conversion of all-trans-retinal into alltrans-retinol requires (A) NAD (B) NADH (C) NADP (D) NADPH

Last Answer : Answer : D

Inducers and repressors are (A) Enhancer and silencer elements respectively (B) Trans-acting factors (C) Cis-acting elements (D) Regulatory proteins

Description : Inducers and repressors are (A) Enhancer and silencer elements respectively (B) Trans-acting factors (C) Cis-acting elements (D) Regulatory proteins

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Besides structural genes that encode proteins, DNA contains some regulatory sequences which are known as (A) Operons (B) Cistrons (C) Cis-acting elements (D) Trans-acting factors

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Folding of newly synthesized proteins is accelerated by (A) Protein disulphide isomerase (B) Prolyl cis-trans isomerase (C) Chaperonins (D) All of these

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Last Answer : Answer : D

Which of the statements is false regarding chiral compounds? (a) rotate the plane of polarized light (b) have cis and trans isomers (c) exist as enantiomers (d) can be detected with a polarimeter

Description : Which of the statements is false regarding chiral compounds? (a) rotate the plane of polarized light (b) have cis and trans isomers (c) exist as enantiomers (d) can be detected with a polarimeter

Last Answer : have cis and trans isomers

You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weight the same or that the dish that falls lower has heavier contents than the other. The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more. Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light -Riddles

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Last Answer : Most people seem to think that the thing to do is weight six coins against six coins, but if you think about it, this would yield you no information concerning the whereabouts of the only different coin. ... . The heavier one is the different coin. If they balance, then 2 is a different light coin.

The following are true about electroretinogram (ERG): a. the a-wave has negative deflection b. a wave is generated by the retinal pigment epithelium c. amacrine cells are responsible for the oscillatory potential d. it is possible to separate the cone and rod ERG

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Last Answer : t is possible to separate the cone and rod ERG

The following are true: a. the ratio of rod to cone is about 20:1 b. there are more ganglion cells in the retina than photoreceptors c. the rod density is the highest nasal to the optic disc d. the retinal artery is the main supply of nutrients to the photoreceptors

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Retinal is converted into retinoic acid in the presence of (A) Retinal oxidase (B) Retinal carboxylase (C) Retinene reductase(D) Spontaneously

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Last Answer : Answer : D

Which can show the cis-trans isomerism:

Description : Which can show the cis-trans isomerism:

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Which of the following combination of axial & equitorial bonds show Cis or Trans orientation in Dimethyl cyclohexane. (i) 1e, 2e (ii) 1e, 3e (iii) 1e,

Description : Which of the following combination of axial & equitorial bonds show Cis or Trans orientation in Dimethyl cyclohexane. (i) 1e, 2e (ii) 1e, 3e (iii) 1e,

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In which compound, Cis-Trans nomenclature cannot be used?

Description : In which compound, Cis-Trans nomenclature cannot be used?

Last Answer : In which compound, Cis-Trans nomenclature cannot be used? A. `CH_(3)-CH=CH-CH_(3)` B. `CH_(3)-CH=CH-COOH` C. D. `C_(6)H_(5)-CH=CH-CHO`

Cis-trans isomerism is found in square planar complexes of molecular formula: (a and b are monodentate ligands)

Description : Cis-trans isomerism is found in square planar complexes of molecular formula: (a and b are monodentate ligands)

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Why cis isomers are polar and trans are not?

Description : Why cis isomers are polar and trans are not?

Last Answer : Need answer

what is indicated by the prefixes cis- and trans-?

Description : what is indicated by the prefixes cis- and trans-?

Last Answer : The type of stereoisomer

Among Cis and Trans structure of Hex-2-ene which has higher boiling point and why?

Description : Among Cis and Trans structure of Hex-2-ene which has higher boiling point and why?

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Two dominant nonallelic genes are 50 map units apart. The linkage is (a) cis type (b) trans type (c) complete (d) absent/incomplete.

Description : Two dominant nonallelic genes are 50 map units apart. The linkage is (a) cis type (b) trans type (c) complete (d) absent/incomplete.

Last Answer : (d) absent/incomplete.

When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be (a) multiple alleles (b) the parts of same gene (c) pseudoalleles (d) different genes

Description : When two genetic loci produce identical phenotypes in cis and trans position, they are considered to be (a) multiple alleles (b) the parts of same gene (c) pseudoalleles (d) different genes

Last Answer : (c) pseudoalleles

What is the term used for isomers that are in rapid equilibrium? (a) keto-enol tautomers (b) constitutional isomers (c) conformational isomers (d) cis-trans isomers

Description : What is the term used for isomers that are in rapid equilibrium? (a) keto-enol tautomers (b) constitutional isomers (c) conformational isomers (d) cis-trans isomers

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Predict which of the following alkenes reacts the fastest with HCl? (a) CH3CH2CH2CH2CH=CH2 (b) cis-CH3CH2CH=CHCH2CH3 (c) trans-CH3CH2CH=CHCH2CH3 (d) (CH3)2C=CHCH2CH3

Description : Predict which of the following alkenes reacts the fastest with HCl? (a) CH3CH2CH2CH2CH=CH2 (b) cis-CH3CH2CH=CHCH2CH3 (c) trans-CH3CH2CH=CHCH2CH3 (d) (CH3)2C=CHCH2CH3

Last Answer : (CH3)2C=CHCH2CH3

What is(are) the product(s) in the Pd-catalyzed hydrogenation of 1,2- dimethylcyclopentene? (a) trans-1,2-dimethylcyclopentane (b) cis-1,2-dimethylcyclopentane (c) a mixture of trans and cis-1,2-dimethylcyclopentane (d) 1,1-dimethylcyclopentane

Description : What is(are) the product(s) in the Pd-catalyzed hydrogenation of 1,2- dimethylcyclopentene? (a) trans-1,2-dimethylcyclopentane (b) cis-1,2-dimethylcyclopentane (c) a mixture of trans and cis-1,2-dimethylcyclopentane (d) 1,1-dimethylcyclopentane

Last Answer : cis-1,2-dimethylcyclopentane

What is the product when 3-heptyne reacts with the Lindlar catalyst? (a) 2-methyl-2-heptene (b) trans-3-heptene (c) cis-2-methyl-3-hexene (d) cis-3-hexene

Description : What is the product when 3-heptyne reacts with the Lindlar catalyst? (a) 2-methyl-2-heptene (b) trans-3-heptene (c) cis-2-methyl-3-hexene (d) cis-3-hexene

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Rank the following dienes in order of increasing stability : trans-1, 3-pentadiene, cis-1,3-pentadiene, 1,4-pentadiene and 1,2-pentadiene

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Which of the following is the most stable alkene? (a) trans-3-hexene(b) cis-3-hexene(c) 1-hexene(d) (Z)-3-hexene

Description : Which of the following is the most stable alkene? (a) trans-3-hexene (b) cis-3-hexene (c) 1-hexene (d) (Z)-3-hexene

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Which of the following statements about propene, CH3CH=CH2, is correct? (a) All nine atoms lie in the same plane. (b) The compound has a cis and trans isomer. (c) There is a total of eight sigma bonds. (d) All the carbon atoms are sp2 hybridized

Description : Which of the following statements about propene, CH3CH=CH2, is correct? (a) All nine atoms lie in the same plane. (b) The compound has a cis and trans isomer. (c) There is a total of eight sigma bonds. (d) All the carbon atoms are sp2 hybridized

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Which of the following compounds will have zero dipole moment? (a) cis-1,2-dibromoethylene (b) 1,1-dibromoethylene (c) trans-1,2-dibromoethylene (d) all of these

Description : Which of the following compounds will have zero dipole moment? (a) cis-1,2-dibromoethylene (b) 1,1-dibromoethylene (c) trans-1,2-dibromoethylene (d) all of these

Last Answer : trans-1,2-dibromoethylene

Why do trans isomers of alkenes have lower boiling points than cis isomers? (a) trans isomers have better symmetry (b) cis isomers have better symmetry (c) trans isomers are less polar (d) cis isomers are less polar

Description : Why do trans isomers of alkenes have lower boiling points than cis isomers? (a) trans isomers have better symmetry (b) cis isomers have better symmetry (c) trans isomers are less polar (d) cis isomers are less polar

Last Answer : trans isomers are less polar

How do the melting points of trans isomers compare to the cis isomers for alkenes? (a) cis isomers have higher melting points (b) trans isomers have higher melting points (c) both have similar melting points (d) no consistent trend is observed

Description : How do the melting points of trans isomers compare to the cis isomers for alkenes? (a) cis isomers have higher melting points (b) trans isomers have higher melting points (c) both have similar melting points (d) no consistent trend is observed

Last Answer : trans isomers have higher melting points

. A and B are stereoisomers. They are nonsuperimposable and are mirror images of one another. Which of the following best describes the relationship between A and B? (a) structural isomers (b) enantiomers (c) cis-trans isomers (d) diastereomers

Description : . A and B are stereoisomers. They are nonsuperimposable and are mirror images of one another. Which of the following best describes the relationship between A and B? (a) structural isomers (b) enantiomers (c) cis-trans isomers (d) diastereomers

Last Answer : enantiomers

Which of the following is capable of exhibiting cis-trans isomerism? (a) 1-butene (b) 1-pentene (c) ethene (d) 2-butene

Description : Which of the following is capable of exhibiting cis-trans isomerism? (a) 1-butene (b) 1-pentene (c) ethene (d) 2-butene

Last Answer : 2-butene

Which of the following compounds may exist as cis-trans isomers? (a) 1-Butene (b) 2-Butene (c) Cyclopropane (d) Acetone

Description : Which of the following compounds may exist as cis-trans isomers? (a) 1-Butene (b) 2-Butene (c) Cyclopropane (d) Acetone

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Which of the following compounds will show dipole moment? (a) cis-1,2-dichloroethylene (b) o-dichlorobenzene (c) trans-1,2-dichloroethylene (d) p-dichlorobenzene

Description : Which of the following compounds will show dipole moment? (a) cis-1,2-dichloroethylene (b) o-dichlorobenzene (c) trans-1,2-dichloroethylene (d) p-dichlorobenzene

Last Answer : cis-1,2-dichloroethylene o-dichlorobenzene

Describe the location of the cis-Golgi and trans-Golgi in relation to the ER.

Description : Describe the location of the cis-Golgi and trans-Golgi in relation to the ER.

Last Answer : The cis-Golgi is closest to the ER, where it is uniquely positioned to receive vesicles that bud off from the ER. The trans-Golgi is located farthest from the ER, and functions to help ... vesicles for delivery to their final destination (e.g. lysosomes, storage vesicles, or the plasma membrane).

Point group C2h belong to the molecule a. H2O b. BeH2 c. Cis C2H4 d. Trans C2H4

Description : Point group C2h belong to the molecule a. H2O b. BeH2 c. Cis C2H4 d. Trans C2H4

Last Answer : d. Trans C2H4

What are the two faces of the Golgi body? (A) Funny face and goofy face (B) Coated face and non-coated face (C) Saving face and loosing face (D) Cis face and Trans face

Description : What are the two faces of the Golgi body? (A) Funny face and goofy face (B) Coated face and non-coated face (C) Saving face and loosing face (D) Cis face and Trans face

Last Answer : (D) Cis face and Trans face

The transport vesicles from the Endoplasmic Reticulum(ER) fuse with the ____of the Golgi apparatus. (A) Cis face (B) Trans face (C) Coated face (D) Both A and B

Description : The transport vesicles from the Endoplasmic Reticulum(ER) fuse with the ____of the Golgi apparatus. (A) Cis face (B) Trans face (C) Coated face (D) Both A and B

Last Answer : (A) Cis face

What is the name given to the non-superimposable mirror image forms of chiral compounds? w) cis-trans x) enantiomers y) functional isomers z) diasteriomers

Description : What is the name given to the non-superimposable mirror image forms of chiral compounds? w) cis-trans x) enantiomers y) functional isomers z) diasteriomers

Last Answer : ANSWER: X -- ENANTIOMERS

The following conditions are required for rhodopsin regeneration: a. NADPH b. darkness c. splitting of all trans-retinal from the opsin d. all above

Description : The following conditions are required for rhodopsin regeneration: a. NADPH b. darkness c. splitting of all trans-retinal from the opsin d. all above

Last Answer : all above

True statement about dark adaptation include: a. the threshold for light intensity falls b. it is biphasic c. the initial adaptation is due to rod adaptation d. the change in the light intensity threshold is usually around 100 folds

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Last Answer : the threshold for light intensity falls

With regard to the blood retina barrier: a. the outer blood retina is formed by the retinal pigment epithelium cells and their junctions b. the blood retina barrier is typically defective in the immediate perpapillary region c. the retinal vascular endothelial cells can actively transport fluid and anions from the extracellular space of the retina into the circulation d. all above

Description : With regard to the blood retina barrier: a. the outer blood retina is formed by the retinal pigment epithelium cells and their junctions b. the blood retina barrier is typically defective in the ... fluid and anions from the extracellular space of the retina into the circulation d. all above

Last Answer : all above

Conversion of retinal into ritonal requires the presence of (A) NADH (B) NADPH (C) FADH2 (D) Lipoic acid

Description : Conversion of retinal into ritonal requires the presence of (A) NADH (B) NADPH (C) FADH2 (D) Lipoic acid

Last Answer : Answer : B