Question 1

Which of the following proteins are known to be associated with focal adhesions?

Accepted Answer

A) actin 
B) aconitase 
C) myosin 
D) malin 
E) actin and myosin 
A) actin 
B) aconitase 
C) myosin 
D) malin 
E) actin and myosin E

Question 2

You genetically engineer nonadhesive cells to express one variety of cadherins and then mix the cells in various combinations.You then monitor their interactions.What do you observe?

Accepted Answer

A) The genetically engineered cells adhered preferentially to cells expressing one of the other cadherins. 
B) The genetically engineered cells adhered preferentially to cells expressing the same cadherins. 
C) The genetically engineered cells did not stick to any other cells. 
D) The genetically engineered cells died. 
E) The genetically engineered cells migrated to a different location. 
A) The genetically engineered cells adhered preferentially to cells expressing one of the other cadherins. 
B) The genetically engineered cells adhered preferentially to cells expressing the same cadherins. 
C) The genetically engineered cells did not stick to any other cells. 
D) The genetically engineered cells died. 
E) The genetically engineered cells migrated to a different location. B

Question 3

If experimentally linked $\alpha$/$\beta$ heterodimer integrin subunits are separated,what happens?

Accepted Answer

A) The molecules bind their ligand tightly 
B) The molecules are unable to bind a ligand. 
C) The molecules are cleaved. 
D) The molecules denature their ligand. 
E) The molecules are denatured and degraded. 
A) The molecules bind their ligand tightly 
B) The molecules are unable to bind a ligand. 
C) The molecules are cleaved. 
D) The molecules denature their ligand. 
E) The molecules are denatured and degraded. B

Question 4

Mutations in other collagen genes can lead to a variety of distinct but related defects in collagen matrix structure,one of which causes hyperflexible joints and highly extensible skin.These defects are usually referred to as ______.

Accepted Answer

A) osteogenesis imperfecta 
B) Ehler-Danlos syndromes 
C) Alport syndromes 
D) Cushing's syndrome 
E) diabetes 
A) osteogenesis imperfecta 
B) Ehler-Danlos syndromes 
C) Alport syndromes 
D) Cushing's syndrome 
E) diabetes

Question 5

What ion is not known to bind to integrins?

Accepted Answer

A) calcium 
B) magnesium 
C) sodium 
D) divalent cations 
E) manganese 
A) calcium 
B) magnesium 
C) sodium 
D) divalent cations 
E) manganese

Question 6

What lines the plasmodesmata?

Accepted Answer

A) integral membrane proteins 
B) peripheral proteins 
C) carbohydrates 
D) the plasma membrane 
E) DNA 
A) integral membrane proteins 
B) peripheral proteins 
C) carbohydrates 
D) the plasma membrane 
E) DNA

Question 7

One small region of a human kidney tubule known as the thick ascending limb (or TAL)has tight junctions that are permeable to magnesium (Mg2+)ions.What is thought to account for the permeability of this tight junction to magnesium ions?

Accepted Answer

A) The membrane in this region is leaky because of special phospholipids. 
B) Loops of claudin molecules that extend into the extracellular space form pores in the TAL. 
C) Loops of claudin molecules that extend into the cytoplasm form pores in the TAL. 
D) Loops of claudin molecules fully embedded in the TAL membrane form pores in the TAL. 
E) Claudin molecules form gap junctions that allow the passage of magnesium ions. 
A) The membrane in this region is leaky because of special phospholipids. 
B) Loops of claudin molecules that extend into the extracellular space form pores in the TAL. 
C) Loops of claudin molecules that extend into the cytoplasm form pores in the TAL. 
D) Loops of claudin molecules fully embedded in the TAL membrane form pores in the TAL. 
E) Claudin molecules form gap junctions that allow the passage of magnesium ions.

Question 8

You coat a Petri dish with fibronectin and proteoglycans and culture cells on the dish.The cells adhere to the dish.You repeat the experiment but this time add RGD tripeptides to the culture dish as the cells are added.What happens?

Accepted Answer

A) The cells adhere as they normally do. 
B) The cells die immediately. 
C) The cells lyse immediately. 
D) The cells do not adhere to the dish. 
E) The cells immediately change their phenotype. 
A) The cells adhere as they normally do. 
B) The cells die immediately. 
C) The cells lyse immediately. 
D) The cells do not adhere to the dish. 
E) The cells immediately change their phenotype.

Question 9

Which of the following tissues are typically not derived from mesenchymal cells?

Accepted Answer

A) mesodermal tissues 
B) ectodermal tissues 
C) blood 
D) muscle 
E) bone 
A) mesodermal tissues 
B) ectodermal tissues 
C) blood 
D) muscle 
E) bone

Question 10

What can be described as solitary,nonadhesive,nonpolarized migratory cells?

Accepted Answer

A) a mesenchyme 
B) cartilage 
C) an epithelium 
D) a mesothelium 
E) an endothelium 
A) a mesenchyme 
B) cartilage 
C) an epithelium 
D) a mesothelium 
E) an endothelium

Question 11

What can be described as a tightly adherent,polarized cell layer?

Accepted Answer

A) a mesenchyme 
B) cartilage 
C) an epithelium 
D) a mesothelium 
E) mesoderm 
A) a mesenchyme 
B) cartilage 
C) an epithelium 
D) a mesothelium 
E) mesoderm

Question 12

The enzyme embedded in the plant cell membrane that catalyzes the growth of a cellulose molecule is called _________.

Accepted Answer

A) cellulase 
B) cellulose synthase 
C) Rubisco 
D) PEP carboxylase 
E) cellulose transferase 
A) cellulase 
B) cellulose synthase 
C) Rubisco 
D) PEP carboxylase 
E) cellulose transferase

Question 13

Attachment of an integrin to its ligand can induce which of the following responses within a cell?

Accepted Answer

A) changes in cytoplasmic pH 
B) changes in cytoplasmic C2+ ion concentration 
C) protein phosphorylation 
D) gene expression 
E) All of these are correct. 
A) changes in cytoplasmic pH 
B) changes in cytoplasmic C2+ ion concentration 
C) protein phosphorylation 
D) gene expression 
E) All of these are correct.

Question 14

In the corneal stroma,the uniformity of collagen fiber size and the ordered packing of the fibers confers what property on the corneal stroma?

Accepted Answer

A) strength 
B) flexibility 
C) extensibility 
D) transparency 
E) opacity 
A) strength 
B) flexibility 
C) extensibility 
D) transparency 
E) opacity

Question 15

How is the structure of the mature plant cell wall similar to the structure of the corneal stroma of the chicken embryo?

Accepted Answer

A) Both contain cellulose. 
B) Both contain adjacent layers of fibers that run parallel to each other. 
C) Both contain phospholipids. 
D) Both contain adjacent layers of fibers that are arranged perpendicular to each other. 
E) Both are composed of collagen. 
A) Both contain cellulose. 
B) Both contain adjacent layers of fibers that run parallel to each other. 
C) Both contain phospholipids. 
D) Both contain adjacent layers of fibers that are arranged perpendicular to each other. 
E) Both are composed of collagen.

Question 16

From the apical surface to the basal surface of an epithelial cell,what is the order of cell junctions observed in the junctional complex?

Accepted Answer

A) tight junction,belt desmosome,spot desmosomes,gap junctions 
B) tight junction,gap junction,belt desmosome,spot desmosomes 
C) belt desmosome,tight junction,gap junctions,spot desmosomes 
D) belt desmosome,gap junctions,tight junctions,spot desmosomes 
E) gap junctions,spot desmosomes,belt desmosome,tight junction 
A) tight junction,belt desmosome,spot desmosomes,gap junctions 
B) tight junction,gap junction,belt desmosome,spot desmosomes 
C) belt desmosome,tight junction,gap junctions,spot desmosomes 
D) belt desmosome,gap junctions,tight junctions,spot desmosomes 
E) gap junctions,spot desmosomes,belt desmosome,tight junction

Question 17

The thicker walls seen in mature plants that no longer allow extensive growth of the cell wall are known as _______.

Accepted Answer

A) primary walls 
B) secondary walls 
C) nonexpandophiles 
D) complete walls 
E) incomplete walls 
A) primary walls 
B) secondary walls 
C) nonexpandophiles 
D) complete walls 
E) incomplete walls

Question 18

What type of cell adhesion molecule is associated with cells being held together by adherens junctions at the site of the junction?

Accepted Answer

A) adherins 
B) selectins 
C) IgSFs 
D) integrins 
E) cadherins 
A) adherins 
B) selectins 
C) IgSFs 
D) integrins 
E) cadherins

Question 19

What is thought to promote the release of future mesoderm cells from an epithelium and their transformation into mesenchymal cells?

Accepted Answer

A) a stoppage in the expression of E-cadherin genes 
B) an increase in the expression of E-cadherin genes 
C) degradation of the cell membrane 
D) the cytoplasm taking on an anti-adhesive character 
E) autophagy of the nucleus 
A) a stoppage in the expression of E-cadherin genes 
B) an increase in the expression of E-cadherin genes 
C) degradation of the cell membrane 
D) the cytoplasm taking on an anti-adhesive character 
E) autophagy of the nucleus

Question 20

Filaments connected to the dense plaque underlying the membrane in a hemidesmosome course outward into the cytoplasm.These filaments are composed of the protein _____ and are best known as ______.

Accepted Answer

A) actin,microfilaments 
B) keratin,microfilaments 
C) actin,intermediate filaments 
D) keratin,intermediate filaments 
E) tubulin,intermediate filaments 
A) actin,microfilaments 
B) keratin,microfilaments 
C) actin,intermediate filaments 
D) keratin,intermediate filaments 
E) tubulin,intermediate filaments

Which of the following proteins are known to be associated with focal adhesions?

You genetically engineer nonadhesive cells to express one variety of cadherins and then mix the cells in various combinations.You then monitor their interactions.What do you observe?

If experimentally linked $\alpha$ / $\beta$ heterodimer integrin subunits are separated,what happens?

Mutations in other collagen genes can lead to a variety of distinct but related defects in collagen matrix structure,one of which causes hyperflexible joints and highly extensible skin.These defects are usually referred to as ______.

What ion is not known to bind to integrins?

What lines the plasmodesmata?

One small region of a human kidney tubule known as the thick ascending limb (or TAL)has tight junctions that are permeable to magnesium (Mg²⁺)ions.What is thought to account for the permeability of this tight junction to magnesium ions?

You coat a Petri dish with fibronectin and proteoglycans and culture cells on the dish.The cells adhere to the dish.You repeat the experiment but this time add RGD tripeptides to the culture dish as the cells are added.What happens?

Which of the following tissues are typically not derived from mesenchymal cells?

What can be described as solitary,nonadhesive,nonpolarized migratory cells?

What can be described as a tightly adherent,polarized cell layer?

The enzyme embedded in the plant cell membrane that catalyzes the growth of a cellulose molecule is called _________.

Attachment of an integrin to its ligand can induce which of the following responses within a cell?

In the corneal stroma,the uniformity of collagen fiber size and the ordered packing of the fibers confers what property on the corneal stroma?

How is the structure of the mature plant cell wall similar to the structure of the corneal stroma of the chicken embryo?

From the apical surface to the basal surface of an epithelial cell,what is the order of cell junctions observed in the junctional complex?

The thicker walls seen in mature plants that no longer allow extensive growth of the cell wall are known as _______.

What type of cell adhesion molecule is associated with cells being held together by adherens junctions at the site of the junction?

What is thought to promote the release of future mesoderm cells from an epithelium and their transformation into mesenchymal cells?

Filaments connected to the dense plaque underlying the membrane in a hemidesmosome course outward into the cytoplasm.These filaments are composed of the protein _ and are best known as __.

Introduction to the Study of Cell and Molecular Biology

The Chemical Basis of Life

Bioenergetics, Enzymes, and Metabolism

The Structure and Function of the Plasma Membrane

Aerobic Respiration and the Mitochondrion

Photosynthesis and the Chloroplast

Cytoplasmic Membrane Systems: Structure, Function, and Membrane Trafficking

The Cytoskeleton and Cell Motility

The Nature of the Gene and the Genome

Gene Expression: From Transcription to Translation

Control of Gene Expression

Dna Replication and Repair

Cellular Reproduction

Cell Signaling and Signal Transduction: Communication Between Cells

Cancer

The Immune Response

Techniques in Cell and Molecular Biology

Filters

Exam 7: Interactions Between Cells and Their Environment

Which of the following proteins are known to be associated with focal adhesions?

You genetically engineer nonadhesive cells to express one variety of cadherins and then mix the cells in various combinations.You then monitor their interactions.What do you observe?

If experimentally linked α\alphaα / β\betaβ heterodimer integrin subunits are separated,what happens?

Mutations in other collagen genes can lead to a variety of distinct but related defects in collagen matrix structure,one of which causes hyperflexible joints and highly extensible skin.These defects are usually referred to as ______.

What ion is not known to bind to integrins?

What lines the plasmodesmata?

One small region of a human kidney tubule known as the thick ascending limb (or TAL)has tight junctions that are permeable to magnesium (Mg2+)ions.What is thought to account for the permeability of this tight junction to magnesium ions?

You coat a Petri dish with fibronectin and proteoglycans and culture cells on the dish.The cells adhere to the dish.You repeat the experiment but this time add RGD tripeptides to the culture dish as the cells are added.What happens?

Which of the following tissues are typically not derived from mesenchymal cells?

What can be described as solitary,nonadhesive,nonpolarized migratory cells?

What can be described as a tightly adherent,polarized cell layer?

The enzyme embedded in the plant cell membrane that catalyzes the growth of a cellulose molecule is called _________.

Attachment of an integrin to its ligand can induce which of the following responses within a cell?

In the corneal stroma,the uniformity of collagen fiber size and the ordered packing of the fibers confers what property on the corneal stroma?

How is the structure of the mature plant cell wall similar to the structure of the corneal stroma of the chicken embryo?

From the apical surface to the basal surface of an epithelial cell,what is the order of cell junctions observed in the junctional complex?

The thicker walls seen in mature plants that no longer allow extensive growth of the cell wall are known as _______.

What type of cell adhesion molecule is associated with cells being held together by adherens junctions at the site of the junction?

What is thought to promote the release of future mesoderm cells from an epithelium and their transformation into mesenchymal cells?

Filaments connected to the dense plaque underlying the membrane in a hemidesmosome course outward into the cytoplasm.These filaments are composed of the protein _____ and are best known as ______.

Introduction to the Study of Cell and Molecular Biology

The Chemical Basis of Life

Bioenergetics, Enzymes, and Metabolism

The Structure and Function of the Plasma Membrane

Aerobic Respiration and the Mitochondrion

Photosynthesis and the Chloroplast

Cytoplasmic Membrane Systems: Structure, Function, and Membrane Trafficking

The Cytoskeleton and Cell Motility

The Nature of the Gene and the Genome

Gene Expression: From Transcription to Translation

Control of Gene Expression

Dna Replication and Repair

Cellular Reproduction

Cell Signaling and Signal Transduction: Communication Between Cells

Cancer

The Immune Response

Techniques in Cell and Molecular Biology

Filters

If experimentally linked $\alpha$ / $\beta$ heterodimer integrin subunits are separated,what happens?

One small region of a human kidney tubule known as the thick ascending limb (or TAL)has tight junctions that are permeable to magnesium (Mg²⁺)ions.What is thought to account for the permeability of this tight junction to magnesium ions?

Filaments connected to the dense plaque underlying the membrane in a hemidesmosome course outward into the cytoplasm.These filaments are composed of the protein _ and are best known as __.