Chemistry of Life Test

How many different kinds of polypeptides each composed of 5 amino acids, could be synthesized using the 20 common amino acids?

20^5

This regulates blood glucose by forcing cells to release or produce MORE glucose

Glucagon

Which of the following is TRUE of BOTH starch and cellulose? a. They are both polymers of glucose b. they are geometric isomers of each other c. they can both be digested by humans d. they are both used for energy storage in plants

a. They are both polymers of glucose

An organic compound is one that a. contains carbon and hydrogen b. is slightly acidic c. forms long chains d. is soluble in water

a. contains carbon and hydrogen

One gram of this will release 9 calories when burned a. fate b. protein c. carbohydrate d.nucleic acids

a. fat

All of the following are carbohydrates except: a. polypeptide b. glycogen c. polysaccharide d. glucose

a. polypeptide

Which would NOT be an expected consequence of changing one amino acid in a particular protein? a. the genetic material would all remain the same b. the primary structure would be changed c. the tertiary structure might be changed d. the biological activity of this protein might be altered

a. the genetic material would all remain the same

What is a fat or triglycerol? a. a protein with tertiary structure b. a lipid made of three fatty acids and glycerol c. a kind of lipid that makes up much of the plasma membrane d. a molecule formed from three alcohols

b. a lipid made of three fatty acids and glycerol

The primary structure of a protein is a. an alpha helix or a pleated sheet b. the amino acid sequence of the polypeptide chain c. composed of two or more polypeptide chains d. maintained by hydrogen bonds

b. amino acid sequence of the polypeptide chain

What of the following is not a protein? a. hemoglobin b. cholesterol c. an antibody d. an enzyme

b. cholesterol

Each of the following is a polymer except: a. protein b. glucose c. cellulose d. starch

b. glucose

Glucose + Galactose = a. Fructose b. Lactose c. Maltose d. sucrose

b. lactose

The tertiary structure of a protein is the a. bonding together of several polypeptides chains by weak bonds b. three dimensional shape c. order in which amino acids are joined in a peptide chain

b. three dimensional shape

Bonded glucose that composes cell walls and is not easily digested a. chitin b. insulin c. cellulose

c. cellulose

The cohesion of water is caused by: a. ionic bonds b. hydrophobic compounds c. hydrogen bonds d. covalent bonds

c. hydrogen bonds

Glucose + Glucose = a. Fructose b. Lactose c. Maltose d. sucrose

c. maltose

A simple ring of sugars (example glucose) a. dissaccharides b. pentose c. monosaccharides d. polysaccharides

c. monosaccharides

Which type of lipid is most important in biological membranes a. fat b. wax c. phospholipid d. oil

c. phospholipid

Most hormones are classified as a. proteins b. insulin c. steroids d. estrogen

c. steroids

Hydrophillic properties are characteristics of all the following except: a. polar molecules b. molecules soluble in water c. the long hydrocarbon chain components of some molecules d. all are hydrophillic properties

c. the long hydrocarbon chain components of some molecules

Which of the following is not a hormone type: a. steroids b. amines c. peptides d. ATP

d. ATP

Which of the following are polysaccharides? a. RNA & DNA b. Glucose & Sucrose c. Cholesterol d. Glucagon & Starch e. Uracil & Thymine

d. Glycogen and Starch

altering which of the following levels of structure organization could change the function of the protein? a. primary b. secondary c. tertiary d. all of the above

d. all of the above

All of the following are carbohydrates except: a. starch b. glycogen c. chitin d. cholesterol

d. cholesterol

Carbohydrates normally function in animals as a. the functional units of lipids b. enzymes in the regulation of metabolic processes c. a component of triglycerides d. energy-storage molecules

d. energy-storage molecules

What is the highest level of protein structure shown by a molecule of hemoglobin> a. tertiary b. primary c. secondary d. quaternary

d. quaternary

This regulates blood glucose by forcing body cells to absorb and use glucose

insulin