Unit 3 Review

Which statement is true about nucleic acids

• They are found only in the nucleus of cells

• They serve as the subunits of proteins

• They are composed of sugar, glucose, and nitrogen base

• They store and transmit genetic information

What happens when and organism has more carbohydrates than needed to meet its energy requirements?

• The organism begins to break down fats

• The organism begins to break down protein

• The extra energy is converted to protein and stored

• The extra energy is converted to fat and stored until needed

Which carbohydrate gives strength to the plant's cell wall?

• Starch

• Cellulose

• Monosaccharide

• Glycogen

Which list of elements represent the repeating subunit of a nucleic acid

• Hydrogen

  Amine Group

  Glycerol

• Hydrogen

  Amine Group

  Carboxyl

• Phosphorus

  Sugar

  Fatty Acid

• Phosphorus

  Sugar

  Nitrogenous Base

How does the change in the ph effects the activity of an enzyme

• It alters the density of the the enzyme

• It alters the enzymes shape

• It alters the solubility of the enzyme

• It alters the concentration of the enzyme

An enzyme catalyzes and breaks down lactose sugar. How is it classified

• Carbohydrate

• Lipid

• Protein

• Nucleic Acid

What affects why enzymes catalyz reactions involving some types of molecules but not others

• the temperature of the environment

• the shape of the molecules involved

• the amount of available for the reaction

• the number of molecules present in the reactants

Lactose is a sugar found in milk. Which statement correctly explains what happens to lactose?

• Lactase catalyzes the breakdown of lactose into glucose and galactose

• Lactase helps combine glucose and galactose to form lactose

• lactase utilizes lactose to breakdown glucose into galactose

• Lactase is converted to lactose in the presence of glucose and galactose

How is an enzyme able to speed up a chemical reaction

• by lowering the start up energy

• by keeping the temperature constant during the reaction

• by altering the structure of the substrate in the chemical reaction

• by changing the ph of the system in which the reaction takes place

Which of the words below is a type of enzyme

• galactose

• glucose

• lactase

• lactose