biology lab chemical composition of cells

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Which of the following are components of a fatty acid?

A carboxyl group and a long hydrocarbon chain

Carbohydrates, like glycogen and cellulose, are examples of polymers. What is a polymer?

A chain of similar building blocks called subunits, or monomers

What is an emulsifier?

A substance that helps fat-soluble and water-soluble compounds mix together

Which enzyme catalyzes the breakdown of starch into sugars?

Amylase

Which of the following reagents is best suited for the detection of sugars?

Benedicts

Carbohydrate molecules consist of what three types of atoms?

Hydrogen,Carbon,Oxygen

How are lipids best defined?

Lipids are biological compounds that are not soluble in water.

A positive reaction for reducing sugar when detected with Benedict's reagent is indicated by

a change in color away from the blue of the reagent that varies.

What is a monomer?

a molecule that can be bonded to other identical molecules to form a polymer.

Proteins are polymers of ______.

amino acids

Why don't water and oil mix?

because water is polar and oil is non polar

The presence of proteins or peptides in a solution can be detected using _________ reagent.

biuret

Starch is best classified as a

carbohydrate

Proteins have many functions including

catalyst for chemical reactions, transport, support, motion, defense

Maltose is which type of carbohydrate?

disaccharide

Which of the following molecules can be formed when monosaccharides combine?

disaccharides,sucrose,polysaccharides,glycogen

Which of the following are examples of monomers?

fatty acids, monosaccharides, glycerol, amino acids

To test a solution for the presence of starch, ______ can be used

iodine

Which of the following molecules is completely insoluble in water?

lipids

Fructose is which type of carbohydrate?

monosaccharide

The three types of macromolecules that are used to build cells are carbohydrates, lipids, and

proteins

To test a solution for the presence of ______________ , Benedict's reagent can be used.

sugars

A positive reaction for protein with Biuret reagent is indicated by

the production of a purple color.

Triglycerides are composed of ___________ fatty acids and ___________ glycerol molecules.

three ; one

The difference between the structure of saturated fats and unsaturated fats is that ______.

unsaturated fats contain one or more double bonds between their carbon atoms

If an iodine test for starch is negative, what color would you expect to see in the tested sample?

yellow

Amylase is a(n)

enzyme

examples of proteins

enzymes, structural molecules, membrane channels, antibodies

The components of lipids that consist of long chains of carbon and hydrogen are called

fatty acids

Which of these occurs in both saturated and unsaturated forms?

fatty acids

What is the name given to a chain composed of many subunits, such as starch, cellulose, or a polypeptide?

polymer

Glycogen is which type of carbohydrate?

polysaccharide

Which type of molecule is starch?

polysaccharide

Varying shades of purple indicate a positive reaction for _____ when testing with Biuret reagent.

protein

Fatty acids without double bonds between their carbon and hydrogen molecules are called ______ fats

saturated

The difference between the structure of saturated fats and unsaturated fats is that ______.

saturated fats contain single bonds only between their carbon atoms

Fatty acids that contain double bonds between their carbon and hydrogen molecules are called ___________ fats.

unsaturated

Emulsifiers have a polar end and a nonpolar end that helps them to disperse lipids in ________ and other polar liquids.

water

A carbohydrate is a macromolecule that contains carbon, hydrogen, and oxygen in what ratio?

1:2:1

Which of these might be used to test for glucose in urine for a person with diabetes?

Benedict's reagent

Which of the following tests is best suited for the detection of fat and oils?

Brown Paper


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