AP Biology Unit

Amino acids are classified according to

• Sequence of amino acids

• If they are single stranded or double stranded

• The properties of the R group

• The properties of the carboxyl group

Which of the following statements correctly describes the difference between saturated and unsaturated fats?

• Saturated fats tend to be solid at room temperature; unsaturated fats are liquid at room temperature

• Saturated fats are cannot pack together closely because of their bent structure; unsaturated fats can pack together because they are flat

• Saturated fats come from plants and fish; unsaturated fats are from animals (except fish)

• Saturated fats are considered “healthy” fats; unsaturated fats may contribute to cardiovascular disease

Which of the following types of molecules has the most energy available per unit of carbon?

• carbohydrates

• lipids

• proteins

• nucleic acids

Pharmaceutical researchers are often interested in blocking particular receptor proteins on cell surfaces. What chemical property of a molecule would be most important for it to bind a receptor active site?

• The molecule's structural shape

• the type of bonding

• the number of double bonds in the molecule

• the number of valence electrons

Some insects can stand on the surface of calm water. Their feet push the surface of the water down slightly, but they do not break the surface. Why?

• The insects are light enough so they do not break the hydrogen bonds holding the water molecules together
  

• The insects actually use their wings to hover slightly above the water’s surface and they only skim it with their feet.

• The insect’s feet are non-polar, so they are repelled by the polar water molecules and are pushed away from the water’s surface.

• The insects are small enough to see the individual water molecules, so they are able to step carefully from one molecule to the next
  

Tags

NGSS.HS-PS2-1

The bonding of 2 amino acid molecules to form a larger molecule requires....

• the addition of a water molecule

• the addition of a nitrogen atom

• the release of a water molecule

• the release of CO₂

This image is of what type of macromolecule?

• lipid

• carbohydrate

• protein

• nucleic acid

Water is an excellent solvent. Select the property that justifies this statement.

• as a polar molecule, it can surround and dissolve ionic and polar molecules

• it forms ionic bonds with ions, hydrogen bonds with polar molecules, and hydrophobic interactions with non polar molecules

• it forms hydrogen bonds with itself so cohesion is possible

• it is liquid and will adhere to many substances

Which 4 elements make up most of all living matter?

• Carbon, Hydrogen, Oxygen, Nitrogen

• Carbon, Oxygen, Sodium, Potassium

• Carbon, Hydrogen, Calcium, Nitrogen

• Carbon, Oxygen, Nitrogen, Sulfur

Which biomolecule is found in fats, oils, and waxes and is a source of long-term energy? 

• Proteins

• Nucleic Acid

• Lipids

• Carbohydrate