Across a membrane phospholipids act as carrier of (A) Organic compounds (B) Inorganic ions (C) Nucleic acids (D) Food materials

Across a membrane phospholipids act as carrier of (A) Organic compounds (B) Inorganic ions (C) Nucleic acids (D) Food materials
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Which one of the following structural formulae of two organic compounds is correctly identified along with its related function?(a) B : Adenine - A nucleotide that makes up nucleic acids (b) A : Triglyceride - Major source of energy (c) B : Uracil - A component of DNA (d) A : Lecithin - A component of cell membrane

Description : Which one of the following structural formulae of two organic compounds is correctly identified along with its related function? (a) B : Adenine - A nucleotide that makes up nucleic acids (b) A : Triglyceride - ... ) B : Uracil - A component of DNA (d) A : Lecithin - A component of cell membrane

Last Answer : (d) A : Lecithin - A component of cell membrane

Phosphorous is an essential component of a. Nucleotides b. Nucleic acids c. Phospholipids and Heichoic acids d. All the above

Description : Phosphorous is an essential component of a. Nucleotides b. Nucleic acids c. Phospholipids and Heichoic acids d. All the above

Last Answer : Ans: D

The importance of phospholipids as constituent of cell membrane is because they possess (A) Fatty acids (B) Both polar and nonpolar groups (C) Glycerol (D) Phosphoric acid

Description : The importance of phospholipids as constituent of cell membrane is because they possess (A) Fatty acids (B) Both polar and nonpolar groups (C) Glycerol (D) Phosphoric acid

Last Answer : Answer : B

A striking feature of living cells is a marked difference between the composition of the cytosol and the extracellular milieu. Which of the following statement(s) concerning the mechanisms of maintenance of these differences is/are true? a. The cell membrane is able to maintain a 10,000 fold gradient between the extracellular concentration of ionized calcium and the intracellular concentration b. The key to these differences is the fact that the plasma membrane is normally impermeable to sodium, potassium and calcium c. The selectivity of biologic membranes is highly consistent and seldom changes d. The selectivity of cell membranes relates only to ions and not organic compounds

Description : A striking feature of living cells is a marked difference between the composition of the cytosol and the extracellular milieu. Which of the following statement(s) concerning the mechanisms of maintenance ... d. The selectivity of cell membranes relates only to ions and not organic compounds

Last Answer : Answer: a The survival of the cell requires that cytosolic composition be maintained within narrow limits, despite the constant influx of nutrients and the simultaneous outflow of waste. A ... be altered drastically as a result of regulatory or signaling processes that occur within the cell

Which one of the following statements is true regarding digestion and absorption of food in humans? (a) Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like Na+. (b) Chylomicrons are small lipoprotein particles that are transported from intestine into blood capillaries. (c) About 60% of starch is hydrolysed by salivary amylase in our mouth. (d) Oxyntic cells in our stomach secrete the proenzyme pepsinogen.

Description : Which one of the following statements is true regarding digestion and absorption of food in humans? (a) Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions ... amylase in our mouth. (d) Oxyntic cells in our stomach secrete the proenzyme pepsinogen.

Last Answer : (a) Fructose and amino acids are absorbed through intestinal mucosa with the help of carrier ions like Na

Long chain fatty acids penetrate the inner mitochondrial membrane (A) Freely (B) As acyl-CoA derivative (C) As carnitine derivative (D) Requiring Na dependent carrier

Description : Long chain fatty acids penetrate the inner mitochondrial membrane (A) Freely (B) As acyl-CoA derivative (C) As carnitine derivative (D) Requiring Na dependent carrier

Last Answer : Answer : C

Insulin increases the permeability of glucose across the plasma membrane of muscle cells by (A) Acting on adenylate cycle (B) By loosening the integrity of the membrane (C) Through Ca2+ ions (D) By membrane cruting the hexose carries of intracellular organelles and making them fuse with the plasma membrane

Description : Insulin increases the permeability of glucose across the plasma membrane of muscle cells by (A) Acting on adenylate cycle (B) By loosening the integrity of the membrane (C) Through Ca2 ... membrane cruting the hexose carries of intracellular organelles and making them fuse with the plasma membrane

Last Answer : Answer : D

The correct sequence for the manufacture of molecules/organic compounds on the primitive earth is (a) NH3, nucleic acid, protein and carbohydrate (b) protein, carbohydrate, water and nucleic acid (c) NH3, protein, carbohydrate and nucleic acid (d) NH3, water, nucleic acid and protein.

Description : The correct sequence for the manufacture of molecules/organic compounds on the primitive earth is (a) NH3, nucleic acid, protein and carbohydrate (b) protein, carbohydrate, water and nucleic acid (c) NH3, protein, carbohydrate and nucleic acid (d) NH3, water, nucleic acid and protein.

Last Answer : (d) NH3, water, nucleic acid and protein.

Carrier ions like Na+ facilitate the absorption of substances like (a) amino acids and glucose (b) glucose and fatty acids (c) fatty acids and glycerol (d) fructose and some amino acids.

Description : Carrier ions like Na+ facilitate the absorption of substances like (a) amino acids and glucose (b) glucose and fatty acids (c) fatty acids and glycerol (d) fructose and some amino acids.

Last Answer : (a) amino acids and glucose

The colloidal particles of organic materials formed in the primitive oceans are called a. Coacervates b. Protoplasm c. Cytoplasm d. Nucleic acid

Description : The colloidal particles of organic materials formed in the primitive oceans are called a. Coacervates b. Protoplasm c. Cytoplasm d. Nucleic acid

Last Answer : a. Coacervates

What are the two differences between organic compounds and inorganic compounds ?

Description : What are the two differences between organic compounds and inorganic compounds ?

Last Answer : The two differences between organic and inorganic compounds are mentioned below: 1. All organic compounds must have carbon in their molecules. Such as: CH 4, C 2 H 3 OH etc. But molecules of ... On the other hand, due to ionic bonds, the reaction of inorganic compounds is faster. Thank you!

Soap Organic Compounds or Inorganic Compounds ?

Description : Soap Organic Compounds or Inorganic Compounds ?

Last Answer : Soap is an organic compound because it is derived from organic compounds. Soap is made by adding caustic soda to organic compounds. . .. CH2-OCO-R .. | CH-OCO-R ............................................ ... .... CH2-OH oil or fat + caustic soda --- > soap + glycerol here R = Cn H 2n + 1 n = 12-18

What is the name of the first organic compound prepared from inorganic compounds ?

Description : What is the name of the first organic compound prepared from inorganic compounds ?

Last Answer : The first organic compound made from inorganic compound is called urea.

Sulphur can be utilized by bacteria in the form of a. Organic compounds b. Inorganic compounds c. Elemental compounds d. All of the above

Description : Sulphur can be utilized by bacteria in the form of a. Organic compounds b. Inorganic compounds c. Elemental compounds d. All of the above

Last Answer : Ans: A

Covalent bonds are mainly found in (a) Organic compounds (b) Inorganic compounds (c) Electrolytes (d) None of the above

Description : Covalent bonds are mainly found in (a) Organic compounds (b) Inorganic compounds (c) Electrolytes (d) None of the above

Last Answer : Ans:(a)

Mention the differences between organic and inorganic compounds.

Description : Mention the differences between organic and inorganic compounds.

Last Answer : Sl. No Property 2 Melting & Boiling points Nature of bonding 3 Solubility 4 5 Combustibility Nature of reaction Homology & Isomerism 1 6 Organic compounds Low, generally ... soluble in water, insoluble in organic solvents very few burn very fast reactions is not common

Who suggested the classification of chemical compounds as inorganic and organic?

Description : Who suggested the classification of chemical compounds as inorganic and organic?

Last Answer : J.J.Berzelius

The movement of water, from one cell of cortex to adjacent one in roots, is due to (a) accumulation of inorganic salts in the cells (b) accumulation of organic compounds in the cells (c) water potential gradient (d) chemical potential gradient.

Description : The movement of water, from one cell of cortex to adjacent one in roots, is due to (a) accumulation of inorganic salts in the cells (b) accumulation of organic compounds in the cells (c) water potential gradient (d) chemical potential gradient.

Last Answer : (c) water potential gradient

Enzymes are A- organic compounds produced by living organism B- .inorganic compounds C- organic as well as inorganic compounds D- all of these

Description : Enzymes are A- organic compounds produced by living organism B- .inorganic compounds C- organic as well as inorganic compounds D- all of these

Last Answer : organic compounds produced by living organism

Who among the following demonstrated experimentally that simple organic molecules like sugar s and amino acids could be produced from inorganic molecules if early earth atmosphere is created (a) Donald Brown (b) A.I. Oparin (c) Oscar Miller (d) Stanley Miller

Description : Who among the following demonstrated experimentally that simple organic molecules like sugar s and amino acids could be produced from inorganic molecules if early earth atmosphere is created (a) Donald Brown (b) A.I. Oparin (c) Oscar Miller (d) Stanley Miller

Last Answer : Ans:(d)

Phospholipids occur in (A) Myelin sheath (B) Stabilizes chylomicrans (C) Erythrocyte membrane (D) All of these

Description : Phospholipids occur in (A) Myelin sheath (B) Stabilizes chylomicrans (C) Erythrocyte membrane (D) All of these

Last Answer : Answer : D

Phospholipids are important cell membrane components since (A) They have glycerol (B) Form bilayers in water (C) Have polar and non-polar portions (D) Combine covalently with proteins

Description : Phospholipids are important cell membrane components since (A) They have glycerol (B) Form bilayers in water (C) Have polar and non-polar portions (D) Combine covalently with proteins

Last Answer : Answer : C

Phospholipids are important cell membrane components because (A) They have glycerol (B) They can form bilayers in water (C) They have both polar and non polar potions (D) They combine covalently with proteins

Description : Phospholipids are important cell membrane components because (A) They have glycerol (B) They can form bilayers in water (C) They have both polar and non polar potions (D) They combine covalently with proteins

Last Answer : Answer : C

All the following processes occur rapidly in the membrane lipid bilayer except (A) Flexing of fatty acyl chains (B) Lateral diffusion of phospholipids (C) Transbilayer diffusion of phopholipids (D) Rotation of phospholipids around their long axes

Description : All the following processes occur rapidly in the membrane lipid bilayer except (A) Flexing of fatty acyl chains (B) Lateral diffusion of phospholipids (C) Transbilayer diffusion of phopholipids (D) Rotation of phospholipids around their long axes

Last Answer : C

Which of the following phospholipids is localized to a greater extent in the outer leaflet of the membrane lipid bilayer? (A) Choline phosphoglycerides (B) Ethanolamine phosphoglycerides (C) Inositol phosphoglycerides (D) Serine phosphoglycerides

Description : Which of the following phospholipids is localized to a greater extent in the outer leaflet of the membrane lipid bilayer? (A) Choline phosphoglycerides (B) Ethanolamine phosphoglycerides (C) Inositol phosphoglycerides (D) Serine phosphoglycerides

Last Answer : A

Through ‘Photosynthesis’ green plants generate - (1) inorganic materials (2) minerals (3) organic materials (4) nutrients

Description : Through ‘Photosynthesis’ green plants generate - (1) inorganic materials (2) minerals (3) organic materials (4) nutrients

Last Answer : (3) organic materials Explanation: Photosynthesis is the process by which green plants and certain other organisms transform light energy into chemical energy. Photosynthesis in green plants harnesses the energy of sunlight to ... + 12H2O (water) -> C6H12O6 (glucose) + 6O2 (oxygen) + H2O (water).

(2) Nitrogen, Phosphorous and Sodium Explanation: Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a soil to supply one or more plant nutrients essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen.

Description : (2) Nitrogen, Phosphorous and Sodium Explanation: Fertilizer (or fertiliser) is any organic or inorganic material of natural or synthetic origin (other than liming materials) that is added to a ... essential to the growth of plants. The three elements most needed in common fertilisers are Nitrogen.

Last Answer : Metal are good conductors, because – (1) they contain free electrons (2) the molecules in them are very close to each other (3) the molecules in them collide very freely (4) they contain reflecting surface

In detritus tanks, A. Flow velocity is kept 0.09 m/sec B. Detention period is kept 3 to 4 minutes C. Organic and inorganic materials are separated D. All the above

Description : In detritus tanks, A. Flow velocity is kept 0.09 m/sec B. Detention period is kept 3 to 4 minutes C. Organic and inorganic materials are separated D. All the above

Last Answer : ANS: D

Through ‘Photosynthesis’ green plants generate (1) inorganic materials (2) minerals (3) organic materials (4) nutrients

Description : Through ‘Photosynthesis’ green plants generate (1) inorganic materials (2) minerals (3) organic materials (4) nutrients

Last Answer : organic materials

Which one of the following compounds is a key intermediate in the synthesis of both triacyl glycerols and phospholipids? (A) CDP Choline (B) Phosphatidase (C) Triacyl glyceride (D) Phosphatidyl serine

Description : Which one of the following compounds is a key intermediate in the synthesis of both triacyl glycerols and phospholipids? (A) CDP Choline (B) Phosphatidase (C) Triacyl glyceride (D) Phosphatidyl serine

Last Answer : Answer : B

Which of the following statements is correct? (a) Sporopollenin can be degraded by enzymes. (b) Sporopollenin is made up of inorganic materials. (c) Sporopollenin can withstand high temperatures as well as strong acids and alkalis. (d) Sporopollenin can withstand high temperatures but not strong acids.

Description : Which of the following statements is correct? (a) Sporopollenin can be degraded by enzymes. (b) Sporopollenin is made up of inorganic materials. (c) Sporopollenin can withstand high temperatures ... strong acids and alkalis. (d) Sporopollenin can withstand high temperatures but not strong acids.

Last Answer : (c) Sporopollenin can withstand high temperatures as well as strong acids and alkalis

Which of the following gives a positive Ninhydrin test? (A) Reducing sugar (B) Triglycerides (C) α-amino acids (D) Phospholipids

Description : Which of the following gives a positive Ninhydrin test? (A) Reducing sugar (B) Triglycerides (C) α-amino acids (D) Phospholipids

Last Answer : Answer : C

Fatty liver is caused due to accumulation of (A) Fatty acids (B) Cholesterol (C) Phospholipids (D) Triacylglycerol

Description : Fatty liver is caused due to accumulation of (A) Fatty acids (B) Cholesterol (C) Phospholipids (D) Triacylglycerol

Last Answer : Answer : D

Very low density lipoproteins are relatively rich in (A) Cholesterol (B) Triacyl glycerol (C) Free fatty acids (D) Phospholipids

Description : Very low density lipoproteins are relatively rich in (A) Cholesterol (B) Triacyl glycerol (C) Free fatty acids (D) Phospholipids

Last Answer : Answer : B

CTP is required for the synthesis of (A) Fatty acids (B) Proteins (C) Phospholipids (D) Cholesterol

Description : CTP is required for the synthesis of (A) Fatty acids (B) Proteins (C) Phospholipids (D) Cholesterol

Last Answer : Answer : C

Phospholipids help the oxidation of (A) Glycerol (B) Fatty acids (C) Glycerophosphates(D) None of these

Description : Phospholipids help the oxidation of (A) Glycerol (B) Fatty acids (C) Glycerophosphates(D) None of these

Last Answer : Answer : B

Lipids are stored in the body mainly in the form of (A) Phospholipids (B) Glycolipids (C) Triglycerides (D) Fatty acids

Description : Lipids are stored in the body mainly in the form of (A) Phospholipids (B) Glycolipids (C) Triglycerides (D) Fatty acids

Last Answer : Answer : C

The major lipid in chylomicrons is (A) Triglycerides (B) Phospholipids (C) Cholesterol (D) Free fatty acids

Description : The major lipid in chylomicrons is (A) Triglycerides (B) Phospholipids (C) Cholesterol (D) Free fatty acids

Last Answer : Answer : A

Unsaturated fatty acids is known as (A) Non-essential fatty acids (B) Essential fatty acids (C) Cerebrosides (D) Phospholipids

Description : Unsaturated fatty acids is known as (A) Non-essential fatty acids (B) Essential fatty acids (C) Cerebrosides (D) Phospholipids

Last Answer : Answer : B

Amino acids provide the nitrogen for the synthesis of (A) The bases of the phospholipids (B) Uric acid (C) Glycolipids (D) Chondroitin sulphates

Description : Amino acids provide the nitrogen for the synthesis of (A) The bases of the phospholipids (B) Uric acid (C) Glycolipids (D) Chondroitin sulphates

Last Answer : Answer : A

There are two properties of the cell necessary to maintain nonequilibrium cellular composition; the first is selectivity and the second is energy conversion. Which of the following statement(s) is/are true concerning energy converting transport? a. The site of energy conversion and transport in the plasma membrane involves the phospholipid component b. The Na+-K++-ATPase derives energy from hydrolysis of extracellular ATP c. In some systems, energy inherent in the transmembrane ion gradient can be used to drive transport of a second species d. Examples of species transported via secondary active transport include hydrogen ions, calcium, amino acids and glucose

Description : There are two properties of the cell necessary to maintain nonequilibrium cellular composition; the first is selectivity and the second is energy conversion. Which of the following statement(s ... transported via secondary active transport include hydrogen ions, calcium, amino acids and glucose

Last Answer : Answer: c, d The selectivity of the plasma membrane, although impressive, cannot account for the nonequilibrium composition of living cells. A cell can be maintained in a nonequilibrium state only by ... to drive the transport of a second species such as protons, calcium, amino acids, or glucose

Substances insoluble in a membrane are carried across the membrane with the concentration gradient by means of a carrier molecule in a process known as: a) osmosis. b) diffusion. c) active transport. d) facilitated diffusion.

Description : Substances insoluble in a membrane are carried across the membrane with the concentration gradient by means of a carrier molecule in a process known as: a) osmosis. b) diffusion. c) active transport. d) facilitated diffusion.

Last Answer : ANSWER: D -- FACILITATED DIFFUSION.

Which of the following statement(s) is/are true concerning cellular ion channels? a. Ion channels are transmembrane proteins that form pores that can conduct ions across the plasma membrane b. Ion channels are formed by membrane-spanning peptides that are arranged so that polar moieties line a central core c. Ion channel proteins undergo conformational changes between open states and closed states d. Ion channels can be blocked

Description : Which of the following statement(s) is/are true concerning cellular ion channels? a. Ion channels are transmembrane proteins that form pores that can conduct ions across the plasma membrane b. ... undergo conformational changes between open states and closed states d. Ion channels can be blocked

Last Answer : Answer: a, b, c, d Ion channels are transmembrane proteins that form pores that can conduct ions across the plasma membrane. Ion channels are formed by membrane-spanning peptides that are arranged ... be blocked by ions or organic compounds that enter the channel, bind there, and occlude the pore

Select the correct statement from the following regarding cell membrane. (a) Na+ and K+ ions move across cell membrane by passive transport. (b) Proteins make up 60 to 70% of the cell membrane. (c) Lipids are arranged in a bilayer with polar heads towards the inner part. (d) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Description : Select the correct statement from the following regarding cell membrane. (a) Na+ and K+ ions move across cell membrane by passive transport. (b) Proteins make up 60 to 70% of the cell ... towards the inner part. (d) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Last Answer : (d) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson.

A key process in metabolism is the transport of hydrogen ions (H+) across a membrane to create a concentration gradient. Explain which arrangement of hydrogen ions (unequal concentration or equal concentration) allows work to be done.

Description : A key process in metabolism is the transport of hydrogen ions (H+) across a membrane to create a concentration gradient. Explain which arrangement of hydrogen ions (unequal concentration or equal concentration) allows work to be done.

Last Answer : It is clear that an unequal concentration, not an equal one, would be the only possibility that work will be done; the unequal concentration of hydrogen ions would allow them to flow across the membrane and increase not only entropy but also work.

Select the correct statement from the following regarding cell membrane (1) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson (2) Na+ and K+ ions move across cell membrane by passive transport (3) Proteins make up 60 to 70% of the cell membrane (4) Lipids are arranged in a bilayer with polar heads towards the inner part

Description : Select the correct statement from the following regarding cell membrane (1) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson (2) Na+ and K+ ions move across cell membrane by ... of the cell membrane (4) Lipids are arranged in a bilayer with polar heads towards the inner part

Last Answer : (1) Fluid mosaic model of cell membrane was proposed by Singer and Nicolson

Which one of the following pairs is matched correctly? a. Ions - covalent bonds b. Carbon - organic compounds c. Glucose - enzyme d. Thymine - amino acid

Description : Which one of the following pairs is matched correctly? a. Ions - covalent bonds b. Carbon - organic compounds c. Glucose - enzyme d. Thymine - amino acid

Last Answer : b. Carbon - organic compounds

What statement about Arrhenius acids is FALSETheir aqueous solutions are electrolytesTheir water solutions are called aqueous acids They increase the concentration of hydroxide ions in aqueous solutionThey are molecular compounds with hydrogen ions?

Description : What statement about Arrhenius acids is FALSETheir aqueous solutions are electrolytesTheir water solutions are called aqueous acids They increase the concentration of hydroxide ions in aqueous solutionThey are molecular compounds with hydrogen ions?

Last Answer : The answer is: They increase the concentration of hydroxide ions in aqueous solution.

Nucleic acids can be detected by means of their absorption maxima near 260 nm. Their absorption in this range is due to (A) Proteins (B) Purines and pyrimidines (C) Ribose (D) Deoxyribose

Description : Nucleic acids can be detected by means of their absorption maxima near 260 nm. Their absorption in this range is due to (A) Proteins (B) Purines and pyrimidines (C) Ribose (D) Deoxyribose

Last Answer : Answer : B

Nucleotides required for the synthesis of nucleic acids can be obtained from (A) Dietary nucleic acids and nucleotides (B) De novo synthesis (C) Salvage of pre-existing bases and nucleosides (D) De novo synthesis and salvage

Description : Nucleotides required for the synthesis of nucleic acids can be obtained from (A) Dietary nucleic acids and nucleotides (B) De novo synthesis (C) Salvage of pre-existing bases and nucleosides (D) De novo synthesis and salvage

Last Answer : Answer : D