Question 1

Match each protein with the correct label in Figure 20-1.   Figure 20-1
-integrin

Accepted Answer

The answer of Match each protein with the correct label...

Question 2

Hemidesmosomes are important for

Accepted Answer

A) tubulation of epithelial sheets. 
B) linkages to glycosaminoglycans. 
C) forming the basal lamina. 
D) attaching epithelial cells to the extracellular matrix. 
A) tubulation of epithelial sheets. 
B) linkages to glycosaminoglycans. 
C) forming the basal lamina. 
D) attaching epithelial cells to the extracellular matrix.

Question 3

Match each name below with the best depiction of the type of epithelial sheet shown in Figure 20-2.Each name and each picture will only be used once. (A)

(B)

(C)

(D)
 
 Figure 20-2
-cuboidal __________

Accepted Answer

The answer of Match each name below with the best...

Question 4

Induced pluripotent stem (iPS) cells

Accepted Answer

A) can be created by the expression of a set of key genes in most somatic cell types, including cells derived from adult tissues. 
B) require a supply of donor egg cells, as is the case for embryonic stem cells. 
C) can differentiate into a greater variety of adult tissues than embryonic stem cells. 
D) have been used to create human clones. 
A) can be created by the expression of a set of key genes in most somatic cell types, including cells derived from adult tissues. 
B) require a supply of donor egg cells, as is the case for embryonic stem cells. 
C) can differentiate into a greater variety of adult tissues than embryonic stem cells. 
D) have been used to create human clones.

Question 5

Which of the following statements about animal connective tissues is TRUE?

Accepted Answer

A) Enzymes embedded in the plasma membrane synthesize the collagen in the extracellular matrix extracellularly. 
B) In connective tissue, the intermediate filaments within the cells are important for carrying the mechanical load. 
C) Cells can attach to a collagen matrix by using fibronectin, an integral membrane protein. 
D) Proteoglycans can resist compression in the extracellular matrix. 
A) Enzymes embedded in the plasma membrane synthesize the collagen in the extracellular matrix extracellularly. 
B) In connective tissue, the intermediate filaments within the cells are important for carrying the mechanical load. 
C) Cells can attach to a collagen matrix by using fibronectin, an integral membrane protein. 
D) Proteoglycans can resist compression in the extracellular matrix.

Question 6

Your friend is a pioneer in ES cell research.In her research, she uses an ES cell line that originated from an inbred strain of laboratory mice called FG426.She has just figured out methods that allow her to grow an entire liver from an ES cell and has successfully grown 10 livers.She demonstrates that the newly grown livers are functional by successfully transplanting one of the new livers into a FG426 laboratory mouse.
You are particularly excited about this, because you have a sick pet mouse called Squeaky.You are very attached to Squeaky, as you found him when you were out camping in New Hampshire.Unfortunately, Squeaky has developed liver disease and will not live much longer without a liver transplant.After you see your friend on TV talking about her new method for growing mouse livers, you immediately grab your cell phone to ask her whether Squeaky could have one of the newly grown livers.Just as you are about to dial your friend, you remember something you learned in cell biology and realize that instead, you should ask your friend about possibly creating mouse iPS cells for Squeaky's benefit.
A.Why do you think that one of the newly grown livers may not work in Squeaky?
B.Explain how the use of iPS cells could solve this problem.

Accepted Answer

A.For organ transplantation to be succes

Question 7

Which of the following statements about integrins is FALSE?

Accepted Answer

A) Integrins use adaptor proteins to interact with the microtubule cytoskeleton. 
B) Integrins can switch to an activated state by binding to an extracellular matrix molecule. 
C) Integrins can switch to an activated state by binding to an intracellular protein. 
D) An activated integrin molecule takes on an extended conformation. 
A) Integrins use adaptor proteins to interact with the microtubule cytoskeleton. 
B) Integrins can switch to an activated state by binding to an extracellular matrix molecule. 
C) Integrins can switch to an activated state by binding to an intracellular protein. 
D) An activated integrin molecule takes on an extended conformation.

Question 8

Which of the following statements is FALSE?

Accepted Answer

A) Proteoglycans can act as filters to regulate which molecules pass through the extracellular medium. 
B) The negative charge associated with proteoglycans attracts cations, which cause water to be sucked into the extracellular matrix. 
C) Proteoglycans are a major component of compact connective tissues but are relatively unimportant in watery tissues such as the jellylike substance in the interior of the eye. 
D) Glycosaminoglycans are components of proteoglycan. 
A) Proteoglycans can act as filters to regulate which molecules pass through the extracellular medium. 
B) The negative charge associated with proteoglycans attracts cations, which cause water to be sucked into the extracellular matrix. 
C) Proteoglycans are a major component of compact connective tissues but are relatively unimportant in watery tissues such as the jellylike substance in the interior of the eye. 
D) Glycosaminoglycans are components of proteoglycan.

Question 9

Which of the following statements about cellulose is FALSE?

Accepted Answer

A) Cellulose synthase enzyme complexes are integral membrane proteins. 
B) An array of microtubules guides the cellulose synthase complex as it moves in the membrane. 
C) The sugar monomers necessary for the synthesis of a cellulose polymer are transported across the plasma membrane. 
D) Microtubules are directly attached to the outside surface of the plasma membrane to form tracks that help orient the cellulose polymers. 
A) Cellulose synthase enzyme complexes are integral membrane proteins. 
B) An array of microtubules guides the cellulose synthase complex as it moves in the membrane. 
C) The sugar monomers necessary for the synthesis of a cellulose polymer are transported across the plasma membrane. 
D) Microtubules are directly attached to the outside surface of the plasma membrane to form tracks that help orient the cellulose polymers.

Question 10

Tight junctions

Accepted Answer

A) allow small, water-soluble molecules to pass from cell to cell. 
B) interact with the intermediate filaments inside the cell. 
C) are formed from claudins and occludins. 
D) are found in cells in connective tissues. 
A) allow small, water-soluble molecules to pass from cell to cell. 
B) interact with the intermediate filaments inside the cell. 
C) are formed from claudins and occludins. 
D) are found in cells in connective tissues.

Question 11

Figure 20-17 shows a sequence of mutations that might underlie the development of colorectal cancer.Explain why the loss of p53 is advantageous to cancerous cells.   
Figure 20-17

Accepted Answer

When DNA is damaged, the protein p53 is

Question 12

Which of the following statements about gap junctions is FALSE?

Accepted Answer

A) Gap junctions are made of connexons. 
B) Molecules up to 1000 daltons in molecular mass can move across gap junctions. 
C) Because gap junctions only allow uncharged molecules to pass through, they are not used for electrically coupling cells. 
D) Gap junctions can close in response to extracellular signals. 
A) Gap junctions are made of connexons. 
B) Molecules up to 1000 daltons in molecular mass can move across gap junctions. 
C) Because gap junctions only allow uncharged molecules to pass through, they are not used for electrically coupling cells. 
D) Gap junctions can close in response to extracellular signals.

Question 13

People who inherit one copy of the Rb (retinoblastoma) gene that is normal and one copy that is mutated-that is, people who are heterozygous for Rb-have a greatly increased risk of cancer.
Given this information, do you agree or disagree with the following statement? Explain your answer.
The Rb mutation must have a dominant effect, which means that it must result in an increase in Rb function.Thus, Rb in its mutant form must be an oncogene.

Accepted Answer

Disagree.It is true that the Rb mutation

Question 14

The plasmodesmata in plants are functionally most similar to which animal cell junction?

Accepted Answer

A) tight junction 
B) adherens junction 
C) gap junction 
D) desmosome 
A) tight junction 
B) adherens junction 
C) gap junction 
D) desmosome

Question 15

Cells that are terminally differentiated

Accepted Answer

A) will undergo apoptosis within a few days. 
B) can no longer undergo cell division. 
C) are unable to move. 
D) no longer produce RNAs. 
A) will undergo apoptosis within a few days. 
B) can no longer undergo cell division. 
C) are unable to move. 
D) no longer produce RNAs.

Question 16

Match each name below with the best depiction of the type of epithelial sheet shown in Figure 20-2.Each name and each picture will only be used once. (A)

(B)

(C)

(D)
 
 Figure 20-2
-squamous __________

Accepted Answer

The answer of Match each name below with the best...

Question 17

Which type of junction contributes the most to the polarization of epithelial cells?

Accepted Answer

A) adherens junctions 
B) desmosomes 
C) tight junctions 
D) gap junctions 
A) adherens junctions 
B) desmosomes 
C) tight junctions 
D) gap junctions

Match each protein with the correct label in Figure 20-1. Figure 20-1 -integrin

Hemidesmosomes are important for

Match each name below with the best depiction of the type of epithelial sheet shown in Figure 20-2.Each name and each picture will only be used once. (A) (B) (C) (D) Figure 20-2 -cuboidal __________

Induced pluripotent stem (iPS) cells

Which of the following statements about animal connective tissues is TRUE?

Which of the following statements about integrins is FALSE?

Which of the following statements is FALSE?

Which of the following statements about cellulose is FALSE?

Tight junctions

Figure 20-17 shows a sequence of mutations that might underlie the development of colorectal cancer.Explain why the loss of p53 is advantageous to cancerous cells. Figure 20-17

Which of the following statements about gap junctions is FALSE?

The plasmodesmata in plants are functionally most similar to which animal cell junction?

Cells that are terminally differentiated

Match each name below with the best depiction of the type of epithelial sheet shown in Figure 20-2.Each name and each picture will only be used once. (A) (B) (C) (D) Figure 20-2 -squamous __________

Which type of junction contributes the most to the polarization of epithelial cells?

Cells: The Fundamental Units of Life

Chemical Components of Cells

Energy, Catalysis, and Biosynthesis

Protein Structure and Function

DNA and Chromosomes

DNA Replication and Repair

From DNA to Protein

Control of Gene Expression

How Genes and Genomes Evolve

Analyzing the Structure and Function of Genes

Membrane Structure

Transport Across Cell Membranes

How Cells Obtain Energy From Food

Energy Generation in Mitochondria and Chloroplasts

Intracellular Compartments and Protein Transport

Cell Signaling

Cytoskeleton

The Cell-Division Cycle

Sexual Reproduction and the Power of Genetics

Filters

Exam 20: Cell Communities: Tissues, Stem Cells, and Cancer

Match each protein with the correct label in Figure 20-1. Figure 20-1 -integrin

Hemidesmosomes are important for

Match each name below with the best depiction of the type of epithelial sheet shown in Figure 20-2.Each name and each picture will only be used once. (A) (B) (C) (D) Figure 20-2 -cuboidal __________

Induced pluripotent stem (iPS) cells

Which of the following statements about animal connective tissues is TRUE?

Which of the following statements about integrins is FALSE?

Which of the following statements is FALSE?

Which of the following statements about cellulose is FALSE?

Tight junctions

Figure 20-17 shows a sequence of mutations that might underlie the development of colorectal cancer.Explain why the loss of p53 is advantageous to cancerous cells. Figure 20-17

Which of the following statements about gap junctions is FALSE?

The plasmodesmata in plants are functionally most similar to which animal cell junction?

Cells that are terminally differentiated

Match each name below with the best depiction of the type of epithelial sheet shown in Figure 20-2.Each name and each picture will only be used once. (A) (B) (C) (D) Figure 20-2 -squamous __________

Which type of junction contributes the most to the polarization of epithelial cells?

Cells: The Fundamental Units of Life

Chemical Components of Cells

Energy, Catalysis, and Biosynthesis

Protein Structure and Function

DNA and Chromosomes

DNA Replication and Repair

From DNA to Protein

Control of Gene Expression

How Genes and Genomes Evolve

Analyzing the Structure and Function of Genes

Membrane Structure

Transport Across Cell Membranes

How Cells Obtain Energy From Food

Energy Generation in Mitochondria and Chloroplasts

Intracellular Compartments and Protein Transport

Cell Signaling

Cytoskeleton

The Cell-Division Cycle

Sexual Reproduction and the Power of Genetics

Filters