AP Bio Test Questions

Which of the following statements best describes how organisms such as rabbits obtain the carbon necessary for building biological molecules?

Rabbits eat plants and break down plant molecules to obtain carbon and other atoms that they rearrange into new carbon-containing molecules.

The atomic number tells you the

number of protons in the atoms & number of its electrons if the atom is neutral

Which of the following best describes the structures of carbohydrates?

They occur as monomers, chains of monomers, and branched structures.

In order for a monomer like glucose to join with another monomer of glucose to produce a two molecule sugar (disaccharide) called maltose a dehydration reaction must occur. If the molecular formula for glucose is C6H12O6, what is the molecular formula of maltose?

C12H22O11

Which of the following is hydrocarbons has a double bond in its carbon skeleton?

C2H4

Many molecules of glucose that are joined together through a dehydration reaction can take on many different structures. Which polymer of glucose IS NOT digestible by humans?

Cellulose

Hydroxyl, carboxyl, amino, phosphate, sulfhydryl, methyl; these are all examples of what part of an organic molecule

Functional groups that influence the properties of the molecule.

Which of the following statements best distinguishes hypotheses from theories in science?

Hypotheses usually are relatively narrow in scope; theories have a broad explanatory power

The molecular structures of linoleic acid and palmitic acid, two naturally occurring substances, are shown in the figure. Based on the molecular structures shown in the figure, which molecule is likely to be solid at room temperature?

Palmitic acid, because the presence of carbon-carbon double bonds prevents the molecules from packing closely together.

Which statement is true regarding phospholipids?

Phospholipids are composed of three fatty acids attached to a glycerol

The carbohydrates glucose, galactose, and fructose have the same chemical formula (C6H12O6) but different structural formulas, as represented in the figure. Which of the following statements is most likely true?

The carbohydrates have different properties because they have different arrangements of carbon, hydrogen, and oxygen atoms.

Which of the following has the GREATEST impact on the creation of polar covalent bonds between hydrogen atoms and the oxygen atom in a water molecule?

The high electronegativity of an oxygen atom compared to a hydrogen atom.

Water and ammonia interact to form hydrogen bonds, as represented in the figure. Which statement best helps explain the formation of the hydrogen bond represented in the figure?

The nitrogen has a partial negative charge, and the hydrogen attached to the oxygen has a partial positive charge.

Which of the following terms describes the relationship between the molecules in the diagram below.

They are isomers of each other.

The synthesis of protein or carbohydrate polymers always produces which of the following as a byproduct?

Water

Which of the following categories includes all others in the list? monosaccharides disaccharides starch carbohydrate polysaccharides

carbohydrate

A feature of organic compounds NOT found in inorganic compounds is the presence of

carbon atoms covalently bonded to each other

Which subatomic particles contributes almost no weight to an atom?

electrons at various energy levels.

When a atom gains electrons , it

forms a negatively charged ion

Which of these properties of water cannot be attributes to hydrogen bonding between water molecules?

ice floats on liquid water

Which of the following is most directly responsible for water's unique properties?

it forms hydrogen bonds

An atom that has two electrons in the outer shell, such as magnesium, would most likely

lose these two electrons and become a positively charged ion

Measurements show that the pH of a particular lake is 4.0. How would you describe the lake?

mildly acidic

Used to carry the genetic code

nucleic acids

A covalent bond is indicated by

overlapping electron shells or a straight line between atomic symbols

A controlled experiment is one that

tests experimental and control groups in parallel

The atomic number tells you the

the number of protons in the atom

Organic chemistry is currently defined as

the study of carbon compounds

Which of the following statements concerning unsaturated fats is true?

they have double bonds in the carbon chain of their fatty acids

In DNA, what nucleotide pairs up with adenosine?

thymine

All nucleotides are made of 3 types of molecules. Which one below is NOT part of a nucleotide?

water

Which of the following is a hydrophobic material?

wax