Chemical Basis for Life

A water molecule is made up of

• two atoms of oxygen and one of hydrogen
• one oxygen atom and one hydrogen atom
• one atom of chlorine and one atom of sodium
• one oxygen atom and two hydrogen atoms

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NGSS.MS-PS1-1

An ionic bond is formed as the result of

• sharing electrons
• sharing protons
• transferring protons
• transferring electrons

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NGSS.HS-PS1-2

An covalent bond is formed as the result of

• sharing electrons
• sharing protons
• transferring protons
• transferring electrons

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NGSS.HS-PS1-2

Ice floats because

• of cohesion
• ice has a higher density than the liquid form
• water shrinks when it freezes
• water expands when it freezes

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NGSS.MS-PS1-4

Characteristics of a polar water molecule include

• oxygen side is slightly positive, hydrogen side slightly negative
• oxygen and hydrogen sides partially positive
• oxygen and hydrogen sides partially negative
• oxygen side negative, hydrogen side slightly positive

Which substance dissolves in water

• nonpolar solute
• solvent
• solution
• polar solute

nucleotide is to nucleic acid as

• glucose is to starch
• amino acid is to protein
• glycerol and fatty acid is to lipid
• all of the above

Classify which of the following is a polysaccharide

• glucose
• fructose
• glycogen
• glycerol

Which organic compound is the main source of energy for living things?

• nucleic acids
• lipids
• carbohydrates
• proteins

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NGSS.HS-LS1-7

Which is not a function of proteins?

• speed up chemical reactions
• short-term energy source
• fight pathogens
• build tissues