VITAMINS AND COENZYMES QUIZ

If protein is made exclusively from nonpolar amino acids, then it will this protein interact with water?

It will act as a buffer and stabilize the pH

It will form a membrane in water

be repelled by water

It will be attracted to water

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H2O and CH4 are both examples of

molecules

none of these

ions

acids

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The elements oxygen, nitrogen, and carbon

can all form covalent bonds with other elements

are common elements in the molecules that make up living organisms

contain protons and neutrons in their atomic nuclei

All of these

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Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

covalent

noncovalent

ionic

hydrogen

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The main difference between an acid and a base is that

bases donate hydrogen ions in water while acids accept hydrogen ions

bases are polar molecules and acids are not

acids are polar molecules and bases are not

acids donate hydrogen ions in water while bases accept hydrogen ions

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A Bronsted acid becomes __________ upon losing a proton.

its conjugate base

highly reactive

a hydronium ion

its conjugate acid

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Which of the following acid/base pairs act as natural buffers in living systems?

H2PO4-/HPO42-

All of these

H2CO3/HCO3-

Histidine+/histidine

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Which of the following character does not apply to water?

The water molecule readily forms hydrophobic interactions

The water molecule is asymmetric

The covalent bonds in water are highly polarized

All three atoms in the water molecule readily form hydrogen bonds

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Which of the following alcohols would be most soluble in water?

butanol

octanol

methanol

ethanol

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The reactions of molecules

are the reactions of the functional groups

All of these

require an enzyme in all cases

are independent of the functional groups

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