ZuoTi.Pro
Question

a) Among the types of topoisomerase, whicnh require energy? b) Enumerate the differences in the mechanism...

a) Among the types of topoisomerase, whicnh require energy?

b) Enumerate the differences in the mechanism of action of the different types of topoisomerases. Why is it necessary for naturally occurring DNA molecules to be negatively supercoiled?

science   biology   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Answer #1

Topoisomerase is an enzyme that breaks and rejoins the DNA strands to relive torsional strain in the DNA duplex due to folding or unwinding.
There are two types of topoisomerases.
1. Type I topoisomerase:
It cleaves and rejoins a single strand.
It does not require ATP hydrolysis for its function.
It is found only in eukaryotes
Three subclasses: IA, IB, and IC

2. Type II topoisomerase:
It cleaves and rejoins two strands.
It requires ATP hydrolysis for its function.
It is found in both prokaryotes and eukaryotes
Two subclasses: IIA and IIB

Negative supercoiling is naturally prevalent because it prepares the molecule for several DNA processes that require strand separation.

0 0
Add a comment
Know the answer?
Add Answer to:
a) Among the types of topoisomerase, whicnh require energy? b) Enumerate the differences in the mechanism...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Not the answer you're looking for? Ask your own homework help question. Our experts will answer your question WITHIN MINUTES for Free.
Similar Homework Help Questions

  • -What are the different Process improvement types. Differences among and examples of: Automation, Streamlining, Business Process...

    -What are the different Process improvement types. Differences among and examples of: Automation, Streamlining, Business Process Reengineering, with examples? -What are the necessary Decision making & Information Systems to help with making decisions - operational, managerial and strategic - differences among level & examples? -How is project success measured: benchmarking, KPIs, CSFs, Efficiency vs Effectiveness and explain?

  • Learning Objective (8-7) What are the similarities and differences among the methods for protecting various types...

    Learning Objective (8-7) What are the similarities and differences among the methods for protecting various types of intellectual property? 2. The plaintiff, Lone Star Steakhouse, operates over 30 Lone Star Steakhouse & Sa loon restaurants in the U.S. The trademarks "Lone Star Cafe" and "Lone Star Steak house & Saloon" are owned by Lone Star Steakhouse. Clothing and accessories with the logo are sold in restaurants. In 1991 the defendant, Alpha, opened a restaurant named "Lone Star Grill" in Arlington,...

  • A company manufactures two types of DVD players, A and B. Although there are differences among...

    A company manufactures two types of DVD players, A and B. Although there are differences among the products, there are a number of common parts within each player. Each model A requires one subassembly C and two subassembly D’s. Each subassembly C requires two F’s and two G’s. Each subassembly D requires two units of F. Each F requires two units of raw material I, while each G requires one unit of raw material H. Each model B requires two...

  • identify your answer. (2 pts ea) 12) Which statement is NOT true? A) There are many different types of lipids. B)...

    identify your answer. (2 pts ea) 12) Which statement is NOT true? A) There are many different types of lipids. B) Lipids are found in cell membranes. C) Some hormones are lipids D) Lipids are soluble in organic solvents. E) All lipids contain fatty acids. 13) The process of building up new molecules in the coll is called A) glycolysis. B) catabolism. C) anabolism. D) metabolism E) transamination. 14) Which of the following does not require energy from ATP hydrolysis?...

  • 12) Which statement is NOT true? A) There are many different types of lipids. B) Lipids...

    12) Which statement is NOT true? A) There are many different types of lipids. B) Lipids are found in cell membranes. C) Some hormones are lipids. D) Lipids are soluble in organic solvents. E) All lipids contain fatty acids. 13) The process of building up new molecules in the coll is called A) glycolysis. B) catabolism. C) anabolism. D) metabolism. E) transamination 14) Which of the following does not require energy from ATP hydrolysis? A) digestion B) synthesis of an...

  • Which of the following statements is true? A. RNA polymerase has a proofreading activity B. Prokaryotic...

    Which of the following statements is true? A. RNA polymerase has a proofreading activity B. Prokaryotic RNA usually undergoes nuclear processing C. Polypeptides are synthesized by addition of amino acids to the amino terminus. D. The 3' end of mRNA corresponds to the carboxyl terminus of the protein. Grade 2. Which of the following A. It may be autocatalytic. B. Spliceosomes are present in organelles and nuclei C. It involves removal of exons is true regarding RNA processing? D. It...

  • 4. In a lake governed by the food web shown in the image to the right, 500 brown trout are added from fisheries. Which of the following outcomes would most likely be expected? A. Tadpole populat...

    4. In a lake governed by the food web shown in the image to the right, 500 brown trout are added from fisheries. Which of the following outcomes would most likely be expected? A. Tadpole population will increase B. Duck population will decrease C. Algae population will increase D. Lilly Pad population will decrease E. Caddis Fly larvae will increase 5. Which of the following pieces of evidence most strongly supports a common ancestor of all life on Earth? A....

  • Question 89 Gluconeogenesis is the A) Result of amylase activity B) Formation of glycogen C) Formation...

    Question 89 Gluconeogenesis is the A) Result of amylase activity B) Formation of glycogen C) Formation of starches D) Formation of glucose from simple two and three-carbon precursors Question 90 The only known regulatory mechanism for pyruvate carbora A) Activation by acetyl Co4 B) Activation by phosphorylation C) Activation by CAMP D) Activation by NADH 20 5 Question 87 Isozymes are enzymes A) From one species that catalyze the same reaction B) From different species that catalyze the same reaction...

  • Unit 3 Study Resource Meiosis • Process by which diploid cells create haploid cells NOT part...

    Unit 3 Study Resource Meiosis • Process by which diploid cells create haploid cells NOT part of the cell cycle > only some cells ever undergo meiosis During meiosis I, homologous chromosomes line up to allow them to be separated into two new cells o They can become "tangled" during this phase, which leads to crossing-over (rearranging the alleles) O Result of meiosis I is two non-identical haploid cells Meiosis Il looks very similar to mitosis, in that sister chromatids...

  • 29. Which of the following would be synthesized in and processed by the smooth endoplasmic reticulum...

    29. Which of the following would be synthesized in and processed by the smooth endoplasmic reticulum and Golgi apparatus? A. lipids and steroids B. DNA polymerase and RNA polymerase C. lysosomal enzymes D. cytoskeletal proteins 30. Which of the following are processed in the Golgi apparatus? A. integral membrane proteins of the plasma membrane B. proteins that are secreted from the cell C. proteins that will be broken down by lysosomes D. all of the above E. none of the...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT