Daniel Brand
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(Biological Molecules) Biology Test sobre Biological Molecules and Tests, creado por Daniel Brand el 16/02/2017.

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Daniel Brand
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Biological Molecules and Tests

Pregunta 1 de 22

1

Which of the following are among the MOST important functions of Calcium, biologically? Check all that apply.

Selecciona una o más de las siguientes respuestas posibles:

  • Ability to see clearly in low light.

  • Rigidity of structures such as teeth.

  • Conduction of action potentials.

  • Muscle contraction.

  • Osmotic pressure of cells.

  • Blood clotting.

  • Cell wall development.

  • Aid in lipid digestion and absorption.

Explicación

Pregunta 2 de 22

1

Rellena los espacios en blanco para completar el texto.

describes the phenomenon of when water molecules to stick together. is what describes when water is more attracted to itself than to surrounding media.

Explicación

Pregunta 3 de 22

1

Why is water's state at room temperature so essential to life? Check all that apply.

Selecciona una o más de las siguientes respuestas posibles:

  • It forms a habitat that animals can move through.

  • Tissues repel water so they don't become hypertonic.

  • It's a good solvent so a good reaction medium and transport medium.

  • It sinks when solidified.

Explicación

Pregunta 4 de 22

1

Rellena los espacios en blanco para completar el texto.

Water's high thermodynamic stability is illustrated in its specific heat , which means it heats up , and heat of , meaning it has a boiling temperature.

Explicación

Pregunta 5 de 22

1

Which of the following are among the MOST important functions of Sodium, biologically? Check all that apply.

Selecciona una o más de las siguientes respuestas posibles:

  • Maintenance of osmotic pressure.

  • Reabsorption of water from the nephron tubule.

  • Aid in carbohydrate absorption.

  • Aid in lipid absorption from the gut.

  • Electrical impulse transmission.

  • Glucose breakdown.

Explicación

Pregunta 6 de 22

1

Which of the following are among the MOST important functions of hydrogen ions, biologically? Check all that apply.

Selecciona una o más de las siguientes respuestas posibles:

  • Photosynthesis.

  • Establishing pH.

  • Respiration.

  • Maintaining free radicals.

  • Solvent.

Explicación

Pregunta 7 de 22

1

Selecciona la opción correcta de los menús desplegables para completar el texto.

Water molecules are held together by ( hydrogen bonds, weak intermolecular forces, ionic bonds, London forces ). This is thanks to oxygen's ( electronegativity, larger size, abundance in air, charge ), which means that the oxygen region of the molecule is slightly more ( negative, positive, thermodynamically stable, thermodynamically unstable ) than the hydrogen regions. Water is said to be a ( polar, reactive, electron-dense, nonpolar ) molecule.
( Hydrogen bonding, Electronegativity, Ionic bonding, Covalent bonding ) is the attraction between ( slightly negative oxygen, slightly larger oxygen, slightly negative hydrogen, slightly positive hydrogen, charged oxygen ) atoms and ( slightly positive hydrogen, slightly positive oxygen, slightly negative hydrogen, slightly smaller hydrogen ) atoms, and explains why water is a ( liquid, vapour, solid, gas ) at room temperature, despite its small size.

Explicación

Pregunta 8 de 22

1

Which of the following are among the MOST important functions of ammonium ions, biologically? Check all that apply.

Selecciona una o más de las siguientes respuestas posibles:

  • Protein synthesis

  • Present in chlorophyll

  • Nucleic acids

  • Hormone production

  • Vitamin absorption

  • Maintaining oncotic pressure

  • Recycling of plasma

Explicación

Pregunta 9 de 22

1

Which of the following are among the MOST important functions of nitrate ions, biologically? Check all that apply.

Selecciona una o más de las siguientes respuestas posibles:

  • Protein synthesis

  • Part of vitamins

  • Form nucleic acids

  • Important role in nitrogen cycle

  • Found in chlorophyll

  • Regulation of pH

  • Reabsorption of glucose from nephron tubule

  • Functional group in haemoglobin

Explicación

Pregunta 10 de 22

1

Water is at its most dense at 4 degrees C.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 11 de 22

1

Selecciona la opción correcta de los menús desplegables para completar el texto.

Not all ( disaccharides, monosaccharides ) are reducing sugars, but no non-reducing sugars are ( monosaccharides, disaccharides, polysaccharides ).

Explicación

Pregunta 12 de 22

1

Which of the following are among the MOST important functions of chloride ions, biologically? Check all that apply.

Selecciona una o más de las siguientes respuestas posibles:

  • Maintenance of pH in stomach

  • Production of urine in kidney

  • Protein synthesis

  • Nucleic acids

  • Hormone secretion and regulation

Explicación

Pregunta 13 de 22

1

Benedict's Solution is commonly used to test for reducing sugars.

Selecciona uno de los siguientes:

  • VERDADERO
  • FALSO

Explicación

Pregunta 14 de 22

1

Selecciona la opción correcta de los menús desplegables para completar el texto.

When testing for a reducing sugar with alkaline copper(II) sulphate, the reducing agent is ( the reducing sugar, starch, copper(II) sulphate, hydrogen ions ). At a temperature of ( 80, 100, 75, 25 ) degrees C, for a duration of ( 3 minutes, 1 minute, 20 seconds, 45 seconds ), ( Cu2+, Cu3+, Cu+ ) is is reduced to ( Cu+, Cu2+, Cu3+, Cu ), by gaining ( an electron, two electrons, a protons ). The new, reduced ion forms ( copper oxide, copper hydroxide, copper(I) sulphate, copper ), which precipitates. The colour change is from ( blue, colourless, white, orange, green ) to ( red, orange, green, blue, colourless ), and the degree of colour change is proportional to the concentration of reducing sugar.

Explicación

Pregunta 15 de 22

1

You have a biological sample, which has been ground up into a uniform consistency. You then add iodine solution in potassium iodide, and notice that the mixture goes from a yellow colour to a dark blue/black. What conclusions can you draw from the reaction?

Selecciona una o más de las siguientes respuestas posibles:

  • Iodine is forming triiodide ions.

  • Starch is present in the sample.

  • The lights have been dimmed.

  • There are reducing sugars in the sample.

  • Iodine is forming diiodide ions.

Explicación

Pregunta 16 de 22

1

Which of the following are among the MOST important functions of phosphate ions, biologically? Check all that apply.

Selecciona una o más de las siguientes respuestas posibles:

  • Rigidity of structures such as teeth.

  • Present in phospholipids.

  • Present in nucleic acids.

  • Maintenance of pH.

  • Cell wall development in plant cells.

  • Hormone secretion and regulation.

  • Present in important enzymes.

  • Required for root growth.

  • Required for leaf health.

Explicación

Pregunta 17 de 22

1

A biuret test is used to detect the presence of...

Selecciona una o más de las siguientes respuestas posibles:

  • Proteins

  • Reducing sugars

  • Non-reducing sugars

  • Lipids

  • Alcohols

Explicación

Pregunta 18 de 22

1

Rellena el espacio en blanco para completar el texto.

Lipids are tested for by the test.

Explicación

Pregunta 19 de 22

1

Selecciona la opción correcta de los menús desplegables para completar el texto.

Before testing for non-reducing sugars, you should test for ( reducing sugars, lipids, pH, actin and/or myosin ). Next, boiling the sample ( with hydrochloric acid, in water, in alkaline solution, with Benedict's Solution ) ensures ( hydrolysis, polymerisation, condensation ) of the sugars. Then, cool and neutralise with ( sodium hydrogen carbonate, sodium hydroxide, sodium chloride ) solution.
If there were any non-reducing sugars in the sample, they will have been converted into ( reducing sugars, glucose, water and carbon dioxide, energy in the form of ATP ), which you can now test for. A ( positive, negative ) result will indicate the presence of non-reducing sugars in the original sample.

Explicación

Pregunta 20 de 22

1

A colorimeter works by...

Selecciona una de las siguientes respuestas posibles:

  • Measuring the light absorption of a specific wavelength by a sample.

  • Measuring the light emittance of a specific wavelength by a sample.

  • Measuring the amount of white light that can pass an opaque sample.

Explicación

Pregunta 21 de 22

1

Selecciona la opción correcta de los menús desplegables para completar el texto.

To test for lipids, first mix thoroughly with ( ethanol, water, hydrocarbon solvent, ammonium solution ). Then, after ( filtering, decanting, distilling, extraction ), pour the mixture into ( water, ethanol, hydrocarbon solvent, Tollens Reagent ). A positive result is indicated by a ( cloudy white, cloudy red, clear blue, clear and colourless ) emulsion.

Explicación

Pregunta 22 de 22

1

Selecciona la opción correcta de los menús desplegables para completar el texto.

The two reagents needed to test for proteins are ( sodium hydroxide, sodium hydrogen carbonate, hydrochloric acid, ethanol ) and ( copper sulphate, ammonia, benzoic acid, magnesium sulphate ). The goal is to see whether ( copper, ammonium, hydroxide, magnesium ) ions form a complex with ( peptide, amine, ester, polymer ) bonds. A colour change from ( blue, colourless, purple, pale yellow ) to ( purple, dark blue, brown, light blue ) indicates a positive result.

Explicación

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