AP Biology

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

Tags

NGSS.HS-LS1-6

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
  

This image is of what type of macromolecule?

• lipid

• carbohydrate

• protein

• nucleic acid

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

Tags

NGSS.MS-LS1-7

Nitrogenous bases are joined by which type of bond?

• polar bonds

• ionic bonds

• covalent bonds

• hydrogen bonds

Tags

NGSS.HS-LS1-1

Which is true for the lipids

• they are insoluble in water

• they are made from glycerol, fatty acids, and phosphate

• they contain less energy than proteins and carbs

• they contain nitrogen