Unit 2 Mini-Exam

Which statements best compare the function of an ATP molecule to a DNA molecule?

• ATP carries and transmits the genetic information of organisms and DNA serves as a biological catalyst that speeds up the rates of chemical reactions
• ATP provides energy for chemical reactions and DNA carries and transmits the genetic information of organisms
• ATP serves as a biological catalyst that speeds up the rates of chemical reactions and DNA acts as structural sugar in the cell walls of plants
• ATP acts as structural sugar in the cell walls of plants and DNA provides energy for chemical reactions

A student makes a Venn diagram to compare the functions of carbohydrates and lipids. Which cellular function of carbohydrates and lipids should be placed in the shared section of the Venn diagram?

• Hormone production
• Structural support of cell walls
• Energy storage
• Catalyst for chemical reactions

Four different nucleotides are used as building blocks of DNA. Which of the following can be used to distinguish one nucleotide from another?

• The nitrogenous base
• The shape of the deoxyribose sugar
• the length of the phosophate group
• the type of fatty acid

Fill in the blank box with the right answer. A macromolecule that is composed of glycerol and fatty acids and functions as a hormone is called

How do enzymes speed up chemical reactions?

• The presence of enzymes increase kinetic energy
• enzymes lower the activation energy
• enzymes store long term energy
• enzymes increase the activation energy

In living organisms, lipids function mainly as -

• sources of stored energy and transmitters of genetic information
• sources of stored energy and main component of cell membranes
• transmitters of genetic information and catalysts of chemical reactions
• catalysts of chemical reactions and components of cell membrane

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

Select all of the statements about enzymes that are correct.

• Enzymes are specific because of their shape and catalyze certain reactions
• Enzymes are destroyed when they are used and synthesize a reaction
• Enzymes lower the activation energy
• Enzymes are made of protein

Proteins and lipids carry several functions in the body of organisms. Specific proteins and lipids do specific tasks. Below is a chart that provides an example of a specific protein and lipid. Below is a chart that provides an example of a specific protein and lipid. Explain how ceramide and collagen are similar in their function for an organism.

Many land plants store energy in starch. When energy is needed, the starch molecules can be broken down quickly. Which of the following is the biomolecule responsible for providing quick energy?

• proteins
• carbohydrates
• amino acids
• peptide chains