Question 1

Oxygen crosses a plasma membrane by

Accepted Answer

A) passive transport. 
B) active transport. 
C) pinocytosis. 
D) osmosis. 
A) passive transport. 
B) active transport. 
C) pinocytosis. 
D) osmosis.

Question 2

Which part of the ATP molecule breaks free of the rest when an ATP molecule is used for energy?

Accepted Answer

A) part A 
B) part B 
C) part C 
D) part D 
A) part A 
B) part B 
C) part C 
D) part D

Question 3

An energy barrier

Accepted Answer

A) is the amount of energy that must be produced by the reactants to end a chemical reaction. 
B) prevents the spontaneous breakdown of molecules in the cell. 
C) is higher than the activation energy of a reaction. 
D) can only be overcome with the use of enzymes. 
A) is the amount of energy that must be produced by the reactants to end a chemical reaction. 
B) prevents the spontaneous breakdown of molecules in the cell. 
C) is higher than the activation energy of a reaction. 
D) can only be overcome with the use of enzymes.

Question 4

If placed in tap water,an animal cell will undergo lysis,whereas a plant cell will not.What accounts for this difference?

Accepted Answer

A) the relative impermeability of the plant cell wall to water 
B) the expulsion of water by the plant cell's central vacuole 
C) the fact that plant cells are isotonic to tap water 
D) the relative inelasticity and strength of the plant cell wall 
A) the relative impermeability of the plant cell wall to water 
B) the expulsion of water by the plant cell's central vacuole 
C) the fact that plant cells are isotonic to tap water 
D) the relative inelasticity and strength of the plant cell wall

Question 5

Which figure depicts an animal cell placed in a solution hypotonic to the cell?

Accepted Answer

A) cell A 
B) cell B 
C) cell C 
D) cell D 
A) cell A 
B) cell B 
C) cell C 
D) cell D

Question 6

Which of the following statements about the ATP molecule is true?

Accepted Answer

A) It contains five phosphate groups. 
B) It releases energy when one phosphate group leaves ATP. 
C) Extremely stable bonds link the second and third phosphate groups. 
D) It contains the sugar glucose. 
A) It contains five phosphate groups. 
B) It releases energy when one phosphate group leaves ATP. 
C) Extremely stable bonds link the second and third phosphate groups. 
D) It contains the sugar glucose.

Question 7

Cells acquire LDLs by

Accepted Answer

A) receptor- mediated endocytosis. 
B) pinocytosis. 
C) diffusion. 
D) phagocytosis. 
A) receptor- mediated endocytosis. 
B) pinocytosis. 
C) diffusion. 
D) phagocytosis.

Question 8

Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline.This is an example of

Accepted Answer

A) irreversible inhibition. 
B) competitive inhibition. 
C) noncompetitive inhibition. 
D) feedback inhibition. 
A) irreversible inhibition. 
B) competitive inhibition. 
C) noncompetitive inhibition. 
D) feedback inhibition.

Question 9

In the lab,you use a special balloon that is permeable to water but not sucrose to make an "artificial cell." The balloon is filled with a solution of 20% sucrose and 80% water and is immersed in a beaker containing a solution of 40% sucrose and 60% water.The solution in the balloon is relative to the solution in the beaker.

Accepted Answer

A) hydrophilic 
B) hypotonic 
C) hypertonic 
D) isotonic 
A) hydrophilic 
B) hypotonic 
C) hypertonic 
D) isotonic

Question 10

Which of the following processes is endergonic?

Accepted Answer

A) the synthesis of glucose from carbon dioxide and water 
B) cellular respiration 
C) the burning of wood 
D) the breakdown of glucose 
A) the synthesis of glucose from carbon dioxide and water 
B) cellular respiration 
C) the burning of wood 
D) the breakdown of glucose

Question 11

Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell.The presence of these organelles tells you that the environment

Accepted Answer

A) contains a higher concentration of solutes than the protozoan. 
B) is isotonic to the protozoan. 
C) is hypotonic to the protozoan. 
D) is hypertonic to the protozoan. 
A) contains a higher concentration of solutes than the protozoan. 
B) is isotonic to the protozoan. 
C) is hypotonic to the protozoan. 
D) is hypertonic to the protozoan.

Question 12

A major function of glycoproteins and glycolipids in the cell membrane is to

Accepted Answer

A) glue cells together to form tissues. 
B) help the cell retain its shape. 
C) allow the cells of an embryo to sort themselves into tissues and organs. 
D) attach the cell membrane to the cytoskeleton. 
A) glue cells together to form tissues. 
B) help the cell retain its shape. 
C) allow the cells of an embryo to sort themselves into tissues and organs. 
D) attach the cell membrane to the cytoskeleton.

Question 13

When an enzyme catalyzes a reaction,

Accepted Answer

A) it raises the activation energy of the reaction. 
B) it acts as a reactant. 
C) it lowers the activation energy of the reaction. 
D) it is used once and discarded. 
A) it raises the activation energy of the reaction. 
B) it acts as a reactant. 
C) it lowers the activation energy of the reaction. 
D) it is used once and discarded.

Question 14

Which of the following is a coenzyme?

Accepted Answer

A) iodine 
B) vitamin B6 
C) iron 
D) zinc 
A) iodine 
B) vitamin B6 
C) iron 
D) zinc

Question 15

The transfer of a phosphate group to a molecule or compound is called

Accepted Answer

A) carboxylation. 
B) hydrogenation. 
C) ionization. 
D) phosphorylation. 
A) carboxylation. 
B) hydrogenation. 
C) ionization. 
D) phosphorylation.

Question 16

Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach.This enzyme is a protein.Which of the following processes could be responsible for its secretion?

Accepted Answer

A) pinocytosis 
B) diffusion 
C) endocytosis 
D) exocytosis 
A) pinocytosis 
B) diffusion 
C) endocytosis 
D) exocytosis

Question 17

Which of the following examples is classified as a metabolic pathway?

Accepted Answer

A) osmosis 
B) passive diffusion 
C) protein synthesis 
D) cell lysis 
A) osmosis 
B) passive diffusion 
C) protein synthesis 
D) cell lysis

Question 18

The cholesterol associated with animal cell membranes

Accepted Answer

A) is attached to membrane proteins and extends into the watery environment surrounding the cell. 
B) is an abnormality resulting from a diet high in cholesterol. 
C) helps solidify the membranes when the room temperature is below freezing. 
D) helps to stabilize the cell membrane at body temperature. 
A) is attached to membrane proteins and extends into the watery environment surrounding the cell. 
B) is an abnormality resulting from a diet high in cholesterol. 
C) helps solidify the membranes when the room temperature is below freezing. 
D) helps to stabilize the cell membrane at body temperature.

Question 19

A plant cell in a hypotonic solution

Accepted Answer

A) becomes turgid because of an inflow of water. 
B) bursts because of an inflow of water. 
C) wilts because of an outflow of water. 
D) shrivels because of an outflow of water. 
A) becomes turgid because of an inflow of water. 
B) bursts because of an inflow of water. 
C) wilts because of an outflow of water. 
D) shrivels because of an outflow of water.

Question 20

The energy required to initiate an exergonic reaction is called

Accepted Answer

A) input energy. 
B) the activation energy. 
C) exergonic energy. 
D) endergonic energy. 
A) input energy. 
B) the activation energy. 
C) exergonic energy. 
D) endergonic energy.

Exam 5: The Working Cell

Oxygen crosses a plasma membrane by

Which part of the ATP molecule breaks free of the rest when an ATP molecule is used for energy?

An energy barrier

If placed in tap water,an animal cell will undergo lysis,whereas a plant cell will not.What accounts for this difference?

Which figure depicts an animal cell placed in a solution hypotonic to the cell?

Which of the following statements about the ATP molecule is true?

Cells acquire LDLs by

Bacterial production of the enzymes needed for the synthesis of the amino acid tryptophan declines with increasing levels of tryptophan and increases as tryptophan levels decline.This is an example of

Which of the following processes is endergonic?

Some protozoans have special organelles called contractile vacuoles that continually eliminate excess water from the cell.The presence of these organelles tells you that the environment

A major function of glycoproteins and glycolipids in the cell membrane is to

When an enzyme catalyzes a reaction,

Which of the following is a coenzyme?

The transfer of a phosphate group to a molecule or compound is called

Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the stomach.This enzyme is a protein.Which of the following processes could be responsible for its secretion?

Which of the following examples is classified as a metabolic pathway?

The cholesterol associated with animal cell membranes

A plant cell in a hypotonic solution

The energy required to initiate an exergonic reaction is called

Biology: Exploring Life

The Chemical Basis of Life

The Molecules of Cells

A Tour of the Cell

How Cells Harvest Chemical Energy

Photosynthesis: Using Light to Make Food

The Cellular Basis of Reproduction and Inheritance

Patterns of Inheritance

Molecular Biology of the Gene

How Genes Are Controlled

Dna Technology and Genomics

How Populations Evolve

The Origin of Species

Tracing Evolutionary History

Microbial Life: Prokaryotes and Protists

The Evolution of Plant and Fungal Diversity

The Evolution of Invertebrate Diversity

The Evolution of Vertebrate Diversity

Unifying Concepts of Animal Structure and Function

Nutrition and Digestion

Gas Exchange

Circulation

The Immune System

Control of Body Temperature and Water Balance

Hormones and the Endocrine System

Reproduction and Embryonic Development

Nervous Systems

The Senses

How Animals Move

Plant Structure,growth,and Reproduction

Plant Nutrition and Transport

Control Systems in Plants

The Biosphere: an Introduction to Earths Diverse Environments

Behavioral Adaptations to the Environment

Population Ecology

Communities and Ecosystems

Conservation Biology

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