Biology STAAR 9A 9B 9C

Which is NOT a function of Protiens?

• Chemical reactions of enzymes
• Short term energy
• Immune responce
• cell signaling 

Why is DNA important?

• it is very small and very complicated
• it's in everything
• it serves as the blueprint for traits of all living things
• because we eat it every day for energy

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The differences between two molecules include the type of sugar that forms a section of the molecules and the identity of one of the four nitrogenous bases that make up another section of the molecules. These two molecules are —

• proteins

• lipids

• nucleic acids

• complex carbohydrates

An advertisement for a health supplement for dogs claims to build lean muscle and strengthen tendons and ligaments, as well as provide energy. Which two biomolecules must the supplement contain to provide these benefits?

• Carbohydrates and lipids

• Proteins and carbohydrates

• Nucleic acids and carbohydrates

• Lipids and nucleic acids

Macromolecules which are both hydrophobic and hydrophilic and are a major component of cell membranes are –

• polysaccharides

• proteins

• phospholipids

• inorganic

Many plants have waxy coatings on some surfaces. This coating reduces water loss because it is not water-permeable. This waxy coating is which of the following types of organic molecule?

• carbohydrate

• lipid

• nucleic acid

• protein

The enzymes that catalyze cellular reactions are macromolecules made of organic compounds composed of carbon, hydrogen, oxygen, and nitrogen. These types of macromolecules are known as

• starches

• sugars

• proteins

• fats

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Why are enzymes considered reusable?

• Enzymes are constantly renewed
• Enzymes are made of unusually strong materials.
• Enzymes are constantly regenerated by respiration.
• Enzymes are not changed when they catalyze a chemical reaction.

What is the purpose  of an enzyme?

• give permission for the reaction
• raise activation energy
• speed up reactions
• control how many reactions occur

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Enzymes are capable of increasing the rate of a chemical reaction within a living cell.  Enzymes accomplish this through which of the following means?

• reducing the number of products   
• reducing the activation energy
• increasing the temperature of the cell
• increasing the concentration of reactants 

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