Molecules of Life

​Molecules of

Life

​What your body made of?

​•The human body is mostly water

–Lean muscle: 75% water

–Blood: 83% water

–Body fat: 25% water

–Bone: 22% water

Water​

​

​•Water is a polar molecule

– Each atom has a partial charge

–Molecule has zero net charge

​Properties of Water

​

​Molecules of LIfe

​Special Properties of Water

•Polar molecules have special properties

–Good solvents

–Bond with each other (cohesion)

–Take longer to heat and cool

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•Water molecules are attracted to molecules of solid surfaces (adhesion)

•Adhesion allows water to move through very small pores or tubes against gravity (capillary action)

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​Learning Check-up

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Multiple Choice

How many percent is water in our lean muscle?

• 78%

• 75%

• 83%

• 25%

Multiple Choice

What is the net charge of water molecule?

• 100

• -1

• +2

• 0

Multiple Choice

Water molecules are attracted to molecules of solid surfaces. What do you call this property?

• Surface tension

• adhesion

• cohesion

• capillary action

​Macromolecules

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​Main source of energy in our body.

​​Carbohydrates

​

​Stores energy and make up biological membranes and waterproof coverings.

​​Lipids

​

​Stores and transmit genetic information

​​Nucleic acid

​

​Control rate of chemical reactions through enzymes. Makes up bones and muscles.

​Protein

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Learning Check-up​

Multiple Choice

Which of the following is considered the main source of energy?

• Lipids

• Proteins

• Carbohydrates

• Nucleic acids

Multiple Choice

Which of the following macromolecules has carbon, hydrogen, oxygen and nitrogen in its formula?

• Lipids

• Proteins

• Carbohydrates

• Nucleic acids

Match

Match the following

• Carbohydrates

• Proteins

• Lipids

• Nucleic acid

monosaccharides

amino acids

fatty acid and glycerol

nucleotides

• monosaccharides

• amino acids

• fatty acid and glycerol

• nucleotides

Multiple Choice

DNA and RNA are good examples of what macromolecule?

• Proteins

• Lipids

• Nucleic acid

• Carbohydrates

Match

Match the following

• Glucose, Fructose, Starch

• Beans and peanuts

• Fats, Oils, Waxes

• DNA, RNA

Carbohydrates

Proteins

Lipids

Nucleic acids

• Carbohydrates

• Proteins

• Lipids

• Nucleic acids

Open Ended

In 5 sentences, write a summary of the lesson molecules of life.

Awesome!​