unit 1 ap exam

if 30% of the nucleotides in a single stranded RNA/RNA molecule are adenine, then what percent are expected to be thymine?

30%

which of the following best represents the amount of starch, water, and glucose in the dialysis bag over the course of the investigation?

A (maybe fix later)

which of the following correctly illustrates a dipeptide and an amino acid in the optimal position to form a tripeptide?

A (starts with H)

which of the following represents saturation of the carrier proteins?

D (the highest point)

amylase is an enzyme that converts carbohydrate polymers into monomers. glycogen synthase is one of the enzyme involved in converting carbohydrate monomers into polymers. which of the following best explains the reactions of these enzymes?

amylase aids in the addition of a water molecule to break down covalent bonds whereas glycogen synthesis aids in the removal of a water molecule to break covenant bonds

according to the graph, as the number of glucose molecules increases, the rate of diffusion

increases until a plateau is reached

When a severely dehydrated patient is brought to the hospital, an IV of normal saline is started immediately. Distilled water is not used because

it would cause the patient's blood cells to swell and eventually burst

A typical bag of fertilizer contains high levels of nitrogen, phosphorus, and potassium but trace amounts of magnesium and calcium. Which of the following best matches the fertilizer component with the molecule in which it will be incorporated by organisms in the area?

nitrogen will be incorporated into nucleic acids

when planting crops, farmers rotate the types of plants that are planted for harvest in order to prevent the soil from being leached of essential minerals. if a farmer plants a crop that leaches the soil of phosphorus, which of the following biomolecules will subsequent plants be unable to synthesize?

phospholipids

Many mammals control their body temperature by sweating. Which property of water is most directly responsible for the ability of sweat to lower body temperature?

the absorption of heat by the breaking of hydrogen bonds

Paramecia are unicellular protists that have contractile vacuoles to remove excess intracellular water. In an experimental investigation, paramecia were placed in salt solutions of increasing osmolarity. The rate at which the contractile vacuole contracted to pump out excess water was determined and plotted against osmolarity of the solutions, as shown in the graph. Which of the following is the correct explanation for the data?

the concentration rate increases as the osmolarity decreases because the amount of water entering the paramecia by osmosis increases

humans produce sweat as a cooling mechanism to maintain a stable internal temperature. which of the following best explains how the properties of water contribute to this psychological process?

the heat hight of vaporization of water allows the body to removed excess heat through a phase change of water from liquid to gas

the central dogma of molecular biology states that

the information flow in a cell is from DNA to protein

how do amino acids affect the tertiary structure of a protein?

the r-group of the last amino acid that is added to a growing polypeptide chain determines the next amino acid that is added to the chain

which of the following best predicts which diagrammed microscope view the laboratory worker would see and explains why?

view 2 because the rate of water movement into the RBC's equals the rate of water movement out of the cells