Quiz
Biological Molecules and Tests
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Questions in this quiz (22)
1Which of the following are among the MOST important functions of Calcium, biologically? Check all that apply.
- AAbility to see clearly in low light.
- BRigidity of structures such as teeth.
- CConduction of action potentials.
- DMuscle contraction.
- EOsmotic pressure of cells.
- FBlood clotting.
- GCell wall development.
- HAid in lipid digestion and absorption.
2[blank_start]Cohesion[blank_end] describes the phenomenon of when water molecules to stick together. [blank_start]Surface tension[blank_end] is what describes when water is more attracted to itself than to surrounding media.
- ACohesion
- BSurface tension
3Why is water's state at room temperature so essential to life? Check all that apply.
- AIt forms a habitat that animals can move through.
- BTissues repel water so they don't become hypertonic.
- CIt's a good solvent so a good reaction medium and transport medium.
- DIt sinks when solidified.
4Water's high thermodynamic stability is illustrated in its [blank_start]high[blank_end] specific heat [blank_start]capacity[blank_end], which means it heats up [blank_start]slowly[blank_end], and [blank_start]latent[blank_end] heat of [blank_start]vaporisation[blank_end], meaning it has a [blank_start]high[blank_end] boiling temperature.
- Ahigh
- Bcapacity
- Cslowly
- Dlatent
- Evaporisation
- Fhigh
5Which of the following are among the MOST important functions of Sodium, biologically? Check all that apply.
- AMaintenance of osmotic pressure.
- BReabsorption of water from the nephron tubule.
- CAid in carbohydrate absorption.
- DAid in lipid absorption from the gut.
- EElectrical impulse transmission.
- FGlucose breakdown.
6Which of the following are among the MOST important functions of hydrogen ions, biologically? Check all that apply.
- APhotosynthesis.
- BEstablishing pH.
- CRespiration.
- DMaintaining free radicals.
- ESolvent.
7Water molecules are held together by [blank_start]hydrogen bonds[blank_end]. This is thanks to oxygen's [blank_start]electronegativity[blank_end], which means that the oxygen region of the molecule is slightly more [blank_start]negative[blank_end] than the hydrogen regions. Water is said to be a [blank_start]polar[blank_end] molecule.
[blank_start]Hydrogen bonding[blank_end] is the attraction between [blank_start]slightly negative oxygen[blank_end] atoms and [blank_start]slightly positive hydrogen[blank_end] atoms, and explains why water is a [blank_start]liquid[blank_end] at room temperature, despite its small size.- Ahydrogen bonds
- Bweak intermolecular forces
- Cionic bonds
- DLondon forces
- Eelectronegativity
- Flarger size
- Gabundance in air
- Hcharge
- Inegative
- Jpositive
- Kthermodynamically stable
- Lthermodynamically unstable
- Mpolar
- Nreactive
- Oelectron-dense
- Pnonpolar
- QHydrogen bonding
- RElectronegativity
- SIonic bonding
- TCovalent bonding
- Uslightly negative oxygen
- Vslightly larger oxygen
- Wslightly negative hydrogen
- Xslightly positive hydrogen
- Ycharged oxygen
- Zslightly positive hydrogen
- AAslightly positive oxygen
- ABslightly negative hydrogen
- ACslightly smaller hydrogen
- ADliquid
- AEvapour
- AFsolid
- AGgas
8Which of the following are among the MOST important functions of ammonium ions, biologically? Check all that apply.
- AProtein synthesis
- BPresent in chlorophyll
- CNucleic acids
- DHormone production
- EVitamin absorption
- FMaintaining oncotic pressure
- GRecycling of plasma
9Which of the following are among the MOST important functions of nitrate ions, biologically? Check all that apply.
- AProtein synthesis
- BPart of vitamins
- CForm nucleic acids
- DImportant role in nitrogen cycle
- EFound in chlorophyll
- FRegulation of pH
- GReabsorption of glucose from nephron tubule
- HFunctional group in haemoglobin
10Water is at its most dense at 4 degrees C.
- ATrue
- BFalse
11Not all [blank_start]disaccharides[blank_end] are reducing sugars, but no non-reducing sugars are [blank_start]monosaccharides[blank_end].
- Adisaccharides
- Bmonosaccharides
- Cmonosaccharides
- Ddisaccharides
- Epolysaccharides
12Which of the following are among the MOST important functions of chloride ions, biologically? Check all that apply.
- AMaintenance of pH in stomach
- BProduction of urine in kidney
- CProtein synthesis
- DNucleic acids
- EHormone secretion and regulation
13Benedict's Solution is commonly used to test for reducing sugars.
- ATrue
- BFalse
14When testing for a reducing sugar with alkaline copper(II) sulphate, the reducing agent is [blank_start]the reducing sugar[blank_end]. At a temperature of [blank_start]80[blank_end] degrees C, for a duration of [blank_start]3 minutes[blank_end], [blank_start]Cu2+[blank_end] is is reduced to [blank_start]Cu+[blank_end], by gaining [blank_start]an electron[blank_end]. The new, reduced ion forms [blank_start]copper oxide[blank_end], which precipitates. The colour change is from [blank_start]blue[blank_end] to [blank_start]red[blank_end], and the degree of colour change is proportional to the concentration of reducing sugar.
- Athe reducing sugar
- Bstarch
- Ccopper(II) sulphate
- Dhydrogen ions
- E80
- F100
- G75
- H25
- I3 minutes
- J1 minute
- K20 seconds
- L45 seconds
- Man electron
- Ntwo electrons
- Oa protons
- PCu2+
- QCu3+
- RCu+
- SCu+
- TCu2+
- UCu3+
- VCu
- Wcopper oxide
- Xcopper hydroxide
- Ycopper(I) sulphate
- Zcopper
- AAblue
- ABcolourless
- ACwhite
- ADorange
- AEgreen
- AFred
- AGorange
- AHgreen
- AIblue
- AJcolourless
15You 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?
- AIodine is forming triiodide ions.
- BStarch is present in the sample.
- CThe lights have been dimmed.
- DThere are reducing sugars in the sample.
- EIodine is forming diiodide ions.
16Which of the following are among the MOST important functions of phosphate ions, biologically? Check all that apply.
- ARigidity of structures such as teeth.
- BPresent in phospholipids.
- CPresent in nucleic acids.
- DMaintenance of pH.
- ECell wall development in plant cells.
- FHormone secretion and regulation.
- GPresent in important enzymes.
- HRequired for root growth.
- IRequired for leaf health.
17A biuret test is used to detect the presence of...
- AProteins
- BReducing sugars
- CNon-reducing sugars
- DLipids
- EAlcohols
18Lipids are tested for by the [blank_start]emulsion[blank_end] test.
- Aemulsion
19Before testing for non-reducing sugars, you should test for [blank_start]reducing sugars[blank_end]. Next, boiling the sample [blank_start]with hydrochloric acid[blank_end] ensures [blank_start]hydrolysis[blank_end] of the sugars. Then, cool and neutralise with [blank_start]sodium hydrogen carbonate[blank_end] solution.
If there were any non-reducing sugars in the sample, they will have been converted into [blank_start]reducing sugars[blank_end], which you can now test for. A [blank_start]positive[blank_end] result will indicate the presence of non-reducing sugars in the original sample.- Areducing sugars
- Blipids
- CpH
- Dactin and/or myosin
- Ewith hydrochloric acid
- Fin water
- Gin alkaline solution
- Hwith Benedict's Solution
- Ihydrolysis
- Jpolymerisation
- Kcondensation
- Lsodium hydrogen carbonate
- Msodium hydroxide
- Nsodium chloride
- Oreducing sugars
- Pglucose
- Qwater and carbon dioxide
- Renergy in the form of ATP
- Spositive
- Tnegative
20A colorimeter works by...
- AMeasuring the light absorption of a specific wavelength by a sample.
- BMeasuring the light emittance of a specific wavelength by a sample.
- CMeasuring the amount of white light that can pass an opaque sample.
21To test for lipids, first mix thoroughly with [blank_start]ethanol[blank_end]. Then, after [blank_start]filtering[blank_end], pour the mixture into [blank_start]water[blank_end]. A positive result is indicated by a [blank_start]cloudy white[blank_end] emulsion.
- Aethanol
- Bwater
- Chydrocarbon solvent
- Dammonium solution
- Efiltering
- Fdecanting
- Gdistilling
- Hextraction
- Iwater
- Jethanol
- Khydrocarbon solvent
- LTollens Reagent
- Mcloudy white
- Ncloudy red
- Oclear blue
- Pclear and colourless
22The two reagents needed to test for proteins are [blank_start]sodium hydroxide[blank_end] and [blank_start]copper sulphate[blank_end]. The goal is to see whether [blank_start]copper[blank_end] ions form a complex with [blank_start]peptide[blank_end] bonds. A colour change from [blank_start]blue[blank_end] to [blank_start]purple[blank_end] indicates a positive result.
- Asodium hydroxide
- Bsodium hydrogen carbonate
- Chydrochloric acid
- Dethanol
- Ecopper sulphate
- Fammonia
- Gbenzoic acid
- Hmagnesium sulphate
- Icopper
- Jammonium
- Khydroxide
- Lmagnesium
- Mpeptide
- Namine
- Oester
- Ppolymer
- Qblue
- Rcolourless
- Spurple
- Tpale yellow
- Upurple
- Vdark blue
- Wbrown
- Xlight blue
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- Biology (Biological Molecules) Quiz on Biological Molecules and Tests, created by Daniel Brand on 16/02/2017.
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- Daniel Brand
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- English
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