Question 1

Unsaturated tails of lipids

Accepted Answer

A) are hydrophilic. 
B) are unstable and tend to break apart. 
C) interact with the tails of other phsopholipids . 
D) will break whenever exposed to phosphate ions. 
E) have all of these attributes. 
A) are hydrophilic. 
B) are unstable and tend to break apart. 
C) interact with the tails of other phsopholipids . 
D) will break whenever exposed to phosphate ions. 
E) have all of these attributes.

Question 2

During receptor-mediated endocytosis

Accepted Answer

A) plasma membrane receptors bind molecules to be enclosed. 
B) a small pit forms beneath the receptors. 
C) a pit closes back on itself. 
D) a vesicle forms. 
E) all of these occur. 
A) plasma membrane receptors bind molecules to be enclosed. 
B) a small pit forms beneath the receptors. 
C) a pit closes back on itself. 
D) a vesicle forms. 
E) all of these occur.

Question 3

The carrier molecules used in active transport are

Accepted Answer

A) calcium ions in the calcium pump. 
B) proteins. 
C) ATP molecules. 
D) carbohydrates. 
E) lipids. 
A) calcium ions in the calcium pump. 
B) proteins. 
C) ATP molecules. 
D) carbohydrates. 
E) lipids.

Question 4

Which of the following affects the rate of diffusion through a selectively permeable membrane? I.concentration gradient
II)temperature
III)molecular size

Accepted Answer

A) I only 
B) II only 
C) I and II 
D) II and III 
E) I, II, and III 
A) I only 
B) II only 
C) I and II 
D) II and III 
E) I, II, and III

Question 5

The sodium-potassium pump is an example of

Accepted Answer

A) simple diffusion. 
B) facilitated diffusion. 
C) osmosis. 
D) active transport. 
E) bulk flow. 
A) simple diffusion. 
B) facilitated diffusion. 
C) osmosis. 
D) active transport. 
E) bulk flow.

Question 6

Movement of a molecule against a concentration gradient is

Accepted Answer

A) simple diffusion. 
B) facilitated diffusion. 
C) osmosis. 
D) active transport. 
E) bulk flow. 
A) simple diffusion. 
B) facilitated diffusion. 
C) osmosis. 
D) active transport. 
E) bulk flow.

Question 7

A mutated form of the CFTR gene is associated with

Accepted Answer

A) recognition proteins. 
B) gap junction formation. 
C) peripheral proteins in plasma membranes. 
D) sinus problems. 
E) passive transporters. 
A) recognition proteins. 
B) gap junction formation. 
C) peripheral proteins in plasma membranes. 
D) sinus problems. 
E) passive transporters.

Question 8

The relative impermeability of membranes to water-soluble molecules is a result of the

Accepted Answer

A) nonpolar nature of water molecules. 
B) presence of large integral membrane proteins. 
C) presence of inorganic salt crystals scattered through some membranes. 
D) presence of cutin and lignin in the membranes. 
E) presence of phospholipids in the lipid bilayer. 
A) nonpolar nature of water molecules. 
B) presence of large integral membrane proteins. 
C) presence of inorganic salt crystals scattered through some membranes. 
D) presence of cutin and lignin in the membranes. 
E) presence of phospholipids in the lipid bilayer.

Question 9

Movement of matter or energy in nature may be the result of

Accepted Answer

A) concentration gradients. 
B) differential pressures. 
C) differences in electrical charges. 
D) the existence of thermal differentials. 
E) all of these. 
A) concentration gradients. 
B) differential pressures. 
C) differences in electrical charges. 
D) the existence of thermal differentials. 
E) all of these.

Question 10

If a plasma membrane were compared to a sandwich, __________ would be considered the filling.

Accepted Answer

A) cholesterol 
B) protein 
C) hydrophilic heads 
D) hydrophobic tails 
E) carbohydrates 
A) cholesterol 
B) protein 
C) hydrophilic heads 
D) hydrophobic tails 
E) carbohydrates

Exam 5: A Closer Look at Cell Membranes

Unsaturated tails of lipids

During receptor-mediated endocytosis

The carrier molecules used in active transport are

Which of the following affects the rate of diffusion through a selectively permeable membrane? I.concentration gradient II)temperature III)molecular size

The sodium-potassium pump is an example of

Movement of a molecule against a concentration gradient is

A mutated form of the CFTR gene is associated with

The relative impermeability of membranes to water-soluble molecules is a result of the

Movement of matter or energy in nature may be the result of

If a plasma membrane were compared to a sandwich, __________ would be considered the filling.

Invitation to Biology

Lifes Chemical Basis

Molecules of Life

Cell Structure and Function

Ground Rules of Metabolism

Where It Startsphotosynthesis

Energy-Releasing Pathways

How Cells Reproduce

Meiosis and Sexual Reproduction

Observing Patterns in Inherited Traits

Chromosomes and Human Inheritance

Dna Structure and Function

From Dna to Protein

Controls Over Genes

Recombinant Dna and Genetic Engineering

The Macroevolutionary Puzzle

Emergence of Evolutionary Thought

Organizing Information About Species

The Origin and Evolution of Life

Viruses and Prokaryotes

Protists the Simplest Eukaryotes

Plants

Fungi

Animals: the Invertebrates

Animal Evolution the Chordates

Human Evolution: a Case Study

Plant Tissues

Plant Nutrition and Transport

Plant Reproduction

Plant Growth and Development

Animal Tissues and Organ Systems

Neural Control

Sensory Perception

Endocrine Control

Protection, Support, and Movement

Circulation

Immunity

Respiration

Digestion and Human Nutrition

Maintaining the Internal Environment

Animal Reproductive Systems

Animal Development

Animal Behavior

Population Ecology

Community Structure and Biodiversity

Ecosystems

The Biosphere

Human Impacts on the Biosphere

Filters