Quiz #3

_________ occurs when a substance produced by a cell inhibits an enzyme required for synthesizing the substance. A) Feedback regulation B) Delayed inhibition C) Noncooperative inhibition D) Irreversible inhibition

A) Feedback regulation

Simple diffusion requires: A) a concentration gradient. B) the use of energy. C) protein channels. D) membrane proteins.

A) a concentration gradient.

The region of an enzyme to which a substrate binds is called the ________ site. A) active B) substrate C) enzymatic D) inactive

A) active

A process that requires energy to move a substance against its concentration gradient is called: A) active transport. B) passive transport. C) facilitated transport. D) osmosis

A) active transport.

Glucose molecules provide energy to power the swimming motion of sperm. In this example, the sperm are changing ________. A) chemical energy into kinetic energy B) chemical energy into potential energy C) kinetic energy into potential energy D) kinetic energy into chemical energy

A) chemical energy into kinetic energy

Which of the following is a measure of randomness in a system? A) entropy B) kinetic energy C) potential energy D) chemical energy

A) entropy

When two solutions that differ in solute concentration are placed on either side of a selectively permeable membrane, and osmosis is allowed to take place, the water will ________. A) exhibit a net movement to the side with lower water concentration B) exhibit a net movement to the side with higher water concentration C) exhibit a net movement to the side with lower solute concentration D) exhibit an equal movement in both directions across the membrane

A) exhibit a net movement to the side with lower water concentration

The CORRECT sequence of stages of mitosis is ________. A) prophase, metaphase, anaphase, telophase B) telophase, prophase, anaphase, metaphase C) anaphase, interphase, prophase, metaphase, telophase D) interphase, prophase, metaphase, anaphase, telophase

A) prophase, metaphase, anaphase, telophase

You have a 2-kg bottle of liquid water at 0°C. About how many Calories are needed to heat up the water to 100°C? A) 100 Calories B) 200 Calories C) 2,000 Calories D) 10,000 Calories

B) 200 Calories

Humans convert approximately ________ of the energy stored in food to useful work. A) 22% B) 34% C) 55% D) 99.9%

B) 34%

What compound directly provides energy for cellular work? A) sugar B) ATP C) DNA D) fat

B) ATP

What is the name of the microtubule-organizing center found in animal cells? A) centriole B) centrosome C) centromere D) kinetochore

B) centrosome

Examine the cells below. Cells with a higher concentration of ions than the surrounding medium tend to ________. CH 5- #67 A) stay about the same size and shape B) expand C) shrink D) divide

B) expand

A cell engulfing small amounts of extracellular fluid will likely utilize ________. A) phagocytosis B) pinocytosis C) receptor-mediated endocytosis D) exocytosis

B) pinocytosis

What kinds of molecules pass through a cell membrane most easily? A) large and hydrophobic B) small and hydrophobic C) large polar D) small and ionic

B) small and hydrophobic

Which statement best describes enzyme function? A) One enzyme can work on thousands of different substrates. B) Enzymes can perform dehydration reactions only. C) Enzymes speed chemical reactions by lowering the activation energy. D) Enzymes chemically alter both the reactants and products.

C) Enzymes speed chemical reactions by lowering the activation energy.

Chromosomes are copied during which phase of the cell cycle? A) M phase B) G1 C) S D) G2

C) S

Ordinary cell division produces two daughter cells that are genetically identical. This type of cell division is important for all of the following functions EXCEPT ________. A) growth of a multicellular organism B) cell replacement C) production of sperm and eggs D) asexual reproduction

C) production of sperm and eggs

The energy stored in an ATP molecule is located in the ________ part of the molecule. A) adenine B) pentose sugar C) terminal phosphate group D) none of the above answers is correct

C) terminal phosphate group

The mitotic cell cycle results in the production of ________. A) four cells, each with the same amount of genetic material and the same genetic information B) two cells, each with the same amount of genetic material but with different genetic information C) two cells, each with the same amount of genetic material and the same genetic information D) four cells, each with the same amount of genetic material but with different genetic information

C) two cells, each with the same amount of genetic material and the same genetic information

Which of the following statements correctly describes the normal tonicity conditions for typical plant and animal cells? The animal cell is in ________. A) a hypotonic solution, and the plant cell is in an isotonic solution B) an isotonic solution, and the plant cell is in a hypertonic solution C) a hypertonic solution, and the plant cell is in an isotonic solution D) an isotonic solution, and the plant cell is in a hypotonic solution

D) an isotonic solution, and the plant cell is in a hypotonic solution

Movement of sodium ions across a plasma membrane requires a concentration gradient and a membrane transport protein. Which type of membrane transport is used to transport these sodium ions? A) simple diffusion B) active transport C) osmosis D) facilitated diffusion E) phagocytosis

D) facilitated diffusion

The sum total of all the chemical reactions that occur in organisms is called ________. A) hydrolysis B) cellular synthesis C) conservation of energy D) metabolism

D) metabolism

The act of a white blood cell engulfing a bacterium is ________. A) osmosis B) diffusion C) exocytosis D) phagocytosis

D) phagocytosis

What is energy? a) the capacity to cause movement b) the capacity to cause change c)a measure of calories d) a measure of disorder

b) the capacity to cause change