AP BIO TEST 1

The most likely explanation for the change in slope of the line between 3 and 5 minutes is ________

*A large amount of the substrate had been consumed* because once it has been consumed the reaction cannot continue

Which of the following pairs of functional groups characterizes the structure of an *AMINO ACID*?

*COOH* and *NH2*

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

*carbon atoms covalently bonded* to each other

The pathway for the transformation of cellular energy most likely evolved first from ________

*glycolysis* because it is the starting point for ALL cellular respiration

Which of the following is responsible for the cohesive property of water?

*hydrogen bonds* between the oxygen atoms on one water molecule and a hydrogen atom of another molecule.

Which of the following macromolecules is primarily responsible for the insolubility of cell membranes in water?

*phospholipid* because fats are nonpolar

The pH of a particular lake is 4.0. What is the hydroxide ion concentration of the lake?

10^-10 M

The nitrogenous base , adenine , is found in which three of the following?

ATP, RNA,and DNA

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

C2H4

Which of the following methods for *the transport of CO2* provides a *buffering system for blood*?

CO2 combines with H2O to form *carbonic acid* and then *bicarbonate*.

Includes *glycogen, chitin, cellulose and glucose*

Carbohydrates!

Which of the following is the most abundant carbon-containing compound in the atmosphere?

Carbon Dioxide!

The site of glucose synthesis is in the ________

Chloroplasts

*Steroid* affecting the fluidity of the plasma membrane

Cholesterol

Essential for synthesis of fats

Gly*cerol*

A storage form of of carbohydrates in muscle

Gly*cogen*

A nitrogen base of nucleic acids

Guanine

Most likely to be broken during replication

Hydrogen bonds

The final electron acceptor for cellular respiration is _________

Oxygen

*Pepsin*, digestive *enzyme* produced in mammalian stomachs

Protein

Animals produce most of their nitrogen-containing wastes during?

Protein digestion

Which of the following is an example of a hydrogen bond?

The attraction of the *hydrogen of one water molecule* *to the oxygen of another molecule*

The movement of water to the top of a 15 meter tree is best explained by

Transpiration and Cohesion

The major component of the bilayer of a cell membrane is the

phospholipid

The structural level of a protein least affected by a disruption in hydrogen bonding is the:

primary level

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 *breaking* of hydrogen bonds

Which of the following is a correct statement about the relationship between pH and the hydrogen-ion concentration of a solution?

the concentration of hydrogen ions in a solution with a pH of 7.0 is 100 times as great as that in a solution with a pH of 9.0

An example of active transport across a membrane is ___

the movement of Na+ into a neuron as a *nerve impulse is generated*