Question 1

The opening in the center of a connexon that allows the passage of solutes between cells is called a(n)________.

Accepted Answer

A) connexin 
B) annulus 
C) cumulous 
D) lunulus 
E) limulus 
A) connexin 
B) annulus 
C) cumulous 
D) lunulus 
E) limulus

Question 2

The basal lamina of which structure may thicken abnormally in long-term diabetics causing kidney failure?

Accepted Answer

A) the dermis 
B) the epidermis 
C) the glomerulus 
D) the bladder epithelium 
E) the pericardium 
A) the dermis 
B) the epidermis 
C) the glomerulus 
D) the bladder epithelium 
E) the pericardium

Question 3

Type I collagen mutations cause a potentially lethal condition characterized by extremely fragile bones,thin skin and weak tendons.This condition is called _______.

Accepted Answer

A) osteogenesis imperfecta 
B) Ehler-Danlos syndrome 
C) Alport syndrome 
D) dwarfism and skeletal deformities 
E) diabetes 
A) osteogenesis imperfecta 
B) Ehler-Danlos syndrome 
C) Alport syndrome 
D) dwarfism and skeletal deformities 
E) diabetes

Question 4

Which tissues below are typically derived from the single-celled epithelium on the dorsal surface of a chick embryo after gastrulation?

Accepted Answer

A) muscle 
B) skin,ectodermal tissues and nervous system 
C) only skin 
D) only ectodermal tissues 
E) only tissues of nervous system 
A) muscle 
B) skin,ectodermal tissues and nervous system 
C) only skin 
D) only ectodermal tissues 
E) only tissues of nervous system

Question 5

The activation of a membrane integrin by the binding of its cytoplasmic portion to molecules in the cytoplasm and the resultant increase in its affinity for an extracellular ligand is called ________.

Accepted Answer

A) inside-out signaling 
B) outside-in signaling 
C) right-side-out signaling 
D) simple signaling 
E) integrination 
A) inside-out signaling 
B) outside-in signaling 
C) right-side-out signaling 
D) simple signaling 
E) integrination

Question 6

Cell walls of young,undifferentiated plant cells must be able to grow along with the cells of which they are a part and thus exhibit extensibility.What are they known as?

Accepted Answer

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

Question 7

When tight junctions,gap junctions and desmosomes are arranged in a specific array,the assortment of surface specializations is called a(n)__________.

Accepted Answer

A) junctional array 
B) synaptonemal complex 
C) belt complex 
D) junctional complex 
E) spot complex 
A) junctional array 
B) synaptonemal complex 
C) belt complex 
D) junctional complex 
E) spot complex

Question 8

You disaggregate cells from two different developing organs and mix them together.Initially,they form a mixed clump.What happens next?

Accepted Answer

A) The clump stabilizes. 
B) The cells sort themselves out so that each cell adhered only to cells of the same type. 
C) The mixed clump persists. 
D) The clumped cells die. 
E) The clump forms a mesenchyme. 
A) The clump stabilizes. 
B) The cells sort themselves out so that each cell adhered only to cells of the same type. 
C) The mixed clump persists. 
D) The clumped cells die. 
E) The clump forms a mesenchyme.

Question 9

The bonds that selectins form with their ligands become _______ when the interaction is __________.

Accepted Answer

A) stronger,placed under mechanical stress 
B) weaker,placed under mechanical stress 
C) stronger,exposed to a higher temperature 
D) more elastic,exposed to a higher temperature 
E) more elastic,placed under mechanical stress 
A) stronger,placed under mechanical stress 
B) weaker,placed under mechanical stress 
C) stronger,exposed to a higher temperature 
D) more elastic,exposed to a higher temperature 
E) more elastic,placed under mechanical stress

Question 10

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 11

Which plant cell wall molecule is economically important as a component essential for the production of jams and jellies?

Accepted Answer

A) hemicellulose 
B) pectin 
C) amylopectin 
D) proteins 
E) desmotubulin 
A) hemicellulose 
B) pectin 
C) amylopectin 
D) proteins 
E) desmotubulin

Question 12

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 13

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 14

Which tissues below are not typically derived from the cells on the dorsal surface of a mammalian embryo after gastrulation that express N-cadherins and stop expressing E-cadherins?

Accepted Answer

A) skin 
B) brain 
C) spinal cord 
D) neural tube 
E) None of these are correct. 
A) skin 
B) brain 
C) spinal cord 
D) neural tube 
E) None of these are correct.

Question 15

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 16

Focal adhesions ________.

Accepted Answer

A) may act as a type of sensory structure 
B) collect information about the physical properties of the extracellular environment 
C) collect information about the chemical properties of the extracellular environment 
D) transmit information to the cell interior that may lead to changes in cell adhesion,proliferation or survival 
E) All of these are correct. 
A) may act as a type of sensory structure 
B) collect information about the physical properties of the extracellular environment 
C) collect information about the chemical properties of the extracellular environment 
D) transmit information to the cell interior that may lead to changes in cell adhesion,proliferation or survival 
E) All of these are correct.

Question 17

The dense central structure that is derived from the smooth endoplasmic reticulum and usually seen in the plasmodesmata is called a(n)________.

Accepted Answer

A) desmosome 
B) desmotubule 
C) hemidesmosome 
D) annulus 
E) desmoglein 
A) desmosome 
B) desmotubule 
C) hemidesmosome 
D) annulus 
E) desmoglein

Question 18

Which disease is an inherited blistering disease that can occur in patients with genetic alterations in any one of a number of hemidesmosomal proteins,including the $\alpha$6 or $\beta$4 integrin subunit,collagen VII or laminin-5?

Accepted Answer

A) epidermolysis bullosa 
B) bullous pemphigoid 
C) blisterosis 
D) hemidesmosomosis 
E) eczema 
A) epidermolysis bullosa 
B) bullous pemphigoid 
C) blisterosis 
D) hemidesmosomosis 
E) eczema

Question 19

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.

Question 20

Animals lacking the claudin-1 gene suffered from ___________.

Accepted Answer

A) uncontrolled water loss 
B) high salt loading 
C) low salt loading 
D) Mg2+ ion permeability 
E) constant,unremitting pain 
A) uncontrolled water loss 
B) high salt loading 
C) low salt loading 
D) Mg2+ ion permeability 
E) constant,unremitting pain

The opening in the center of a connexon that allows the passage of solutes between cells is called a(n)________.

The basal lamina of which structure may thicken abnormally in long-term diabetics causing kidney failure?

Type I collagen mutations cause a potentially lethal condition characterized by extremely fragile bones,thin skin and weak tendons.This condition is called _______.

Which tissues below are typically derived from the single-celled epithelium on the dorsal surface of a chick embryo after gastrulation?

The activation of a membrane integrin by the binding of its cytoplasmic portion to molecules in the cytoplasm and the resultant increase in its affinity for an extracellular ligand is called ________.

Cell walls of young,undifferentiated plant cells must be able to grow along with the cells of which they are a part and thus exhibit extensibility.What are they known as?

When tight junctions,gap junctions and desmosomes are arranged in a specific array,the assortment of surface specializations is called a(n)__________.

You disaggregate cells from two different developing organs and mix them together.Initially,they form a mixed clump.What happens next?

The bonds that selectins form with their ligands become _ when the interaction is ____.

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

Which plant cell wall molecule is economically important as a component essential for the production of jams and jellies?

What lines the plasmodesmata?

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

Which tissues below are not typically derived from the cells on the dorsal surface of a mammalian embryo after gastrulation that express N-cadherins and stop expressing E-cadherins?

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

Focal adhesions ________.

The dense central structure that is derived from the smooth endoplasmic reticulum and usually seen in the plasmodesmata is called a(n)________.

Which disease is an inherited blistering disease that can occur in patients with genetic alterations in any one of a number of hemidesmosomal proteins,including the $\alpha$ ₆ or $\beta$ ₄ integrin subunit,collagen VII or laminin-5?

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?

Animals lacking the claudin-1 gene suffered from ___________.

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

The opening in the center of a connexon that allows the passage of solutes between cells is called a(n)________.

The basal lamina of which structure may thicken abnormally in long-term diabetics causing kidney failure?

Type I collagen mutations cause a potentially lethal condition characterized by extremely fragile bones,thin skin and weak tendons.This condition is called _______.

Which tissues below are typically derived from the single-celled epithelium on the dorsal surface of a chick embryo after gastrulation?

The activation of a membrane integrin by the binding of its cytoplasmic portion to molecules in the cytoplasm and the resultant increase in its affinity for an extracellular ligand is called ________.

Cell walls of young,undifferentiated plant cells must be able to grow along with the cells of which they are a part and thus exhibit extensibility.What are they known as?

When tight junctions,gap junctions and desmosomes are arranged in a specific array,the assortment of surface specializations is called a(n)__________.

You disaggregate cells from two different developing organs and mix them together.Initially,they form a mixed clump.What happens next?

The bonds that selectins form with their ligands become _______ when the interaction is __________.

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

Which plant cell wall molecule is economically important as a component essential for the production of jams and jellies?

What lines the plasmodesmata?

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

Which tissues below are not typically derived from the cells on the dorsal surface of a mammalian embryo after gastrulation that express N-cadherins and stop expressing E-cadherins?

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

Focal adhesions ________.

The dense central structure that is derived from the smooth endoplasmic reticulum and usually seen in the plasmodesmata is called a(n)________.

Which disease is an inherited blistering disease that can occur in patients with genetic alterations in any one of a number of hemidesmosomal proteins,including the α\alphaα 6 or β\betaβ 4 integrin subunit,collagen VII or laminin-5?

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?

Animals lacking the claudin-1 gene suffered from ___________.

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

The bonds that selectins form with their ligands become _ when the interaction is ____.

Which disease is an inherited blistering disease that can occur in patients with genetic alterations in any one of a number of hemidesmosomal proteins,including the $\alpha$ ₆ or $\beta$ ₄ integrin subunit,collagen VII or laminin-5?