Answer the questions based on the following passage: To study chromatid adhesion, Paliulis mastered the high...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
Answer the questions based on the following passage: To study chromatid adhesion, Paliulis mastered the high art of manipulating two infinitesimal glass needles to impale each of two sister chromatids in cultured grasshopper cells at the appropriate time in cell division. Then, she would ever-so-gently apply force to pull them apart. Upon release, if they remained apart it revealed they were separated; but if they snapped back together the researchers would know the chromatids were still attached. Paliulis was a Duke graduate student when she performed the experiments, but is now a postdoctoral fellow at the University of North Carolina at Chapel Hill The experiments revealed that the chromatids are attached to one another, but that they initially separate at their centers, zipping apart until they are entirely separate. Then, they can be drawn to the opposite poles of the dividing cell. The experiments also revealed that it is the erosion of linkages between the chromatids, and not any tension exerted by the spindle, that causes the chromatids to separate. Also intriguing, found the researchers, was that the chromatids mysteriously remained stuck to one another at a time when biochemical analysis could not detect any cohesin proteins in the cell. Nicklas believes that the twin chromatids may still have some entanglements between the corresponding DNA strands on each chromatid. DNA, which makes up genes in the cell, replicates itself as a central process in chromosome duplication. "So, we're left with the mystery of what molecules hold the chromatids together at this point in cell division," Nicklas said. "But that's the usual outcome of work in my laboratory and a sign that we're doing good science since we raise new questions. We lay the mechanistic groundwork for the molecular explanations that have to be made. So, our colleagues who do molecular work are both provoked and challenged by us," he said. Source: http://www.sciencedaily.com/releases/2005/01/050111180610.htm a) Describe how these scientists believe the sister chromatids are separated. during mitosis. b) Explain why these scientists think that they are doing "good science". Answer the questions based on the following passage: To study chromatid adhesion, Paliulis mastered the high art of manipulating two infinitesimal glass needles to impale each of two sister chromatids in cultured grasshopper cells at the appropriate time in cell division. Then, she would ever-so-gently apply force to pull them apart. Upon release, if they remained apart it revealed they were separated; but if they snapped back together the researchers would know the chromatids were still attached. Paliulis was a Duke graduate student when she performed the experiments, but is now a postdoctoral fellow at the University of North Carolina at Chapel Hill The experiments revealed that the chromatids are attached to one another, but that they initially separate at their centers, zipping apart until they are entirely separate. Then, they can be drawn to the opposite poles of the dividing cell. The experiments also revealed that it is the erosion of linkages between the chromatids, and not any tension exerted by the spindle, that causes the chromatids to separate. Also intriguing, found the researchers, was that the chromatids mysteriously remained stuck to one another at a time when biochemical analysis could not detect any cohesin proteins in the cell. Nicklas believes that the twin chromatids may still have some entanglements between the corresponding DNA strands on each chromatid. DNA, which makes up genes in the cell, replicates itself as a central process in chromosome duplication. "So, we're left with the mystery of what molecules hold the chromatids together at this point in cell division," Nicklas said. "But that's the usual outcome of work in my laboratory and a sign that we're doing good science since we raise new questions. We lay the mechanistic groundwork for the molecular explanations that have to be made. So, our colleagues who do molecular work are both provoked and challenged by us," he said. Source: http://www.sciencedaily.com/releases/2005/01/050111180610.htm a) Describe how these scientists believe the sister chromatids are separated. during mitosis. b) Explain why these scientists think that they are doing "good science".
Expert Answer:
Answer rating: 100% (QA)
AnsaIn the excrept above we can find the rationale behind the conclusion by the scientists that the ... View the full answer
Related Book For
Posted Date:
Students also viewed these finance questions
-
Answer the questions based on these two annual reports. (Auckland Airport )https://corporate.aucklandairport.co.nz/investors/results-and-reports(2018 Financial Statements) (Air New Zealand)...
-
Answer the questions based on concept and your understanding of how the budget numbers are interrelated. Assume each of the following questions is an independent situation. A. what would be the...
-
Answer all the questions based on IKEA`s annual report 2017. 1. Does Report contain the company`s mission statement? How would you characterize the company`s approach to communicating its mission...
-
The ordinary share capital of PP Ltd (a trading company) is owned 32% by QQ Ltd, 35% by RR Ltd and 23% by SS Ltd. The remaining 10% is owned by various individuals, none of whom own more than 1%. All...
-
Pedro purchases 50 shares of Piper Company stock on February 19, 2008, at a cost of $4,300. He sells the 50 shares on July 2, 2011, for $9,000. On March 14, 2011, Pedro purchases 100 shares of Troxel...
-
What is the difference between the voting paradox and the Arrow impossibility theorem?
-
Use the data in Short Exercise 16-12 to prepare Little People Learning Center's (LPLC) statement of cash flows for the year ended June 30, 2005. LPI.C uses the direct method for operating activities....
-
Parandah Electronics Ltd., located in England, assembles a standard electrical component from parts it purchases from various suppliers. The production process consists of several steps, starting...
-
ABC Ltd. has two divisions. The Compound Division makes A2C2, an industrial compound, which is then transferred to the Processing Division. The Processing Division further processes the A2C2 and...
-
Dave is considering quitting smoking. Assume that Dave lives three periods (indexed by 0,1,2), and that he might quit in period 0 or in period 1. If he does not quit, he will receive a consumption...
-
Suppose the government increases the sales tax, affecting restaurants, hotels, and other products purchased by tourists. Explain the impact on tourists, local consumers, and local businesses.
-
The lifetime of a light bulb in a certain application is normally distributed with mean \(\mu=1400\) hours and standard deviation \(\sigma=200\) hours. a. What is the probability that a light bulb...
-
Purse Corporation owns 70 percent of Scarf Companys voting shares. On January 1, 20X3, Scarf sold bonds with a par value of $600,000 at 98. Purse purchased $400,000 par value of the bonds; the...
-
Pistol Corporation purchased 100 percent ownership of Scope Products on January 1, 20X6, for $56,000, at which time Scope Products reported retained earnings of $10,000 and capital stock outstanding...
-
In Problems 47-56, decide whether you would use a permutation, a combination, or neither. Next, write the solution using permutation notation or combination notation, if possible, and, finally,...
-
In Problems 47-56, decide whether you would use a permutation, a combination, or neither. Next, write the solution using permutation notation or combination notation, if possible, and, finally,...
-
Below are some cases. LIST THE ALGORITHM, PSEUDOCODE AND FLOW CHART OF THE FOLLOWING CASES. -THE PROGRAM LANGUAGE IS JAVA - FOLLOW THE GIVEN EXAMPLE BELOW -PLEASE PROVIDE AN IMAGE FOR FLOW CHART...
-
Pearl Medavoy will invest $10,240 a year for 20 years in a fund that will earn 10% annual interest. . If the first payment into the fund occurs today, what amount will be in the fund in 20 years? If...
-
The reduced row echelon form of a system of linear equations is given. Write the system of equations corresponding to the given matrix. Use x, y; or x, y, z; or x 1 , x 2 , x 3 , x 4 as variables....
-
Identify each conic without completing the square or rotating axes. 3x 2 xy + 2y 2 + 3y + 1 =
-
In problem, P = (x, y) is the point on the unit circle that corresponds to a real number t. Find the exact values of the six trigonometric functions of t. (22/3, -1/3)
-
Of all the registered automobiles in Colorado, 8% fail the state emissions test. Twelve automobiles are selected at random to undergo an emissions test. a. Find the probability that exactly three of...
-
In Exercises 2732, determine whether the table represents a discrete probability distribution. If not, explain why not. x P(x) -4 0.35 -1 0.25 0 0.15 2 0.25
-
The Centers for Disease Control and Prevention reports that 25% of baby boys 68 months old in the United States weigh more than 20 pounds. A sample of 16 babies is studied. a. What is the probability...
Study smarter with the SolutionInn App