Ask Question, Ask an Expert

+1-415-315-9853

info@mywordsolution.com

Ask Biology Expert

The Ames test is used to determine if an external agent (such as a chemical) can act as a mutagen. In this test, several different his- strains of Salmonella typhimurium are used. Each strain contains a different class of mutation in the his gene. Each mutant is exposed to the chemical to determine if the chemical can revert the mutation back to wild type (his+), and at what frequency.

(a) How can such prototrophic revertants be identified?

(b) In this experiment, three different strains of Salmonella were used to determine the mutagenic properties of three different chemicals. The following table lists the type of mutation in each his mutant and the number of revertants obtained with the addition of each of the three chemicals. Are any of the chemicals putative mutagens? If so, what type of mutations do they cause? Justify your answer.

Strain Type of his-mutation Water Chemical1 Chemical2 Chemical3
Strain1 T to G base substitution 2 2000 3 5
Strain 2 G to A base substitution 1 1 4 1700
Strain 3 Single base deletion 3 2 4 3

Biology, Academics

  • Category:- Biology
  • Reference No.:- M926587

Have any Question? 


Related Questions in Biology

Hans had had a strep throat two weeks before he was to

Hans had had a strep throat two weeks before he was to start anew job. He had to complete some work before he could resign fromhis old position so he ignored the bacterial infection. In thefirst week of his new job he no ...

Which phylloclade commonly found in xerophytic plants that

Which phylloclade commonly found in xerophytic plants that is modified?

What fundamental assumption underlies the concept of an

What fundamental assumption underlies the concept of an ocean commons?

Differentiate between ectoderm mesoderm and endoderm and

Differentiate between ectoderm, mesoderm and endoderm and list what tissues arise from each.

Lake stratificationhow does heat affect the tripariat

Lake Stratification: How does heat affect the tripariat thermal structure of a lake (epiliminion, thermocline and hypolimnion) during the summer and does the application of wind change this?

Do some research and describe at least one specific example

Do some research and describe at least one specific example where antibiotic overuse has resulted in a negative effect. What was the effect of this overuse? How could this have been prevented? What do you think about ant ...

Dolly dolly and more dollyit all started with a sheep named

Dolly, Dolly, and More Dolly It all started with a sheep named Dolly. In the mid-1990s, scientists proved convincingly that after decades of trying, we could, indeed, clone mammals - and even possibly, human beings. Unsu ...

A cell undergoing meiosis produces a daughter cell during

A cell undergoing meiosis produces a daughter cell, during which one nondisjunction event occurs. If the number of chromosomes in a normal diploid cell of this organism (not undergoing cell division) is 38, how many chro ...

List and describe different sediments that can be seen in

List and describe different sediments that can be seen in urine and differentiate between normal and abnormal sediments.

Annie is a new district attorney da for her county and she

Annie is a new district attorney (DA) for her county and she has her first day in court. She walks into the courtroom and sits at the plaintiff's table. She feels pretty relaxed and is excited about her first case as a D ...

  • 4,153,160 Questions Asked
  • 13,132 Experts
  • 2,558,936 Questions Answered

Ask Experts for help!!

Looking for Assignment Help?

Start excelling in your Courses, Get help with Assignment

Write us your full requirement for evaluation and you will receive response within 20 minutes turnaround time.

Ask Now Help with Problems, Get a Best Answer

WalMart Identification of theory and critical discussion

Drawing on the prescribed text and/or relevant academic literature, produce a paper which discusses the nature of group

Section onea in an atwood machine suppose two objects of

SECTION ONE (a) In an Atwood Machine, suppose two objects of unequal mass are hung vertically over a frictionless

Part 1you work in hr for a company that operates a factory

Part 1: You work in HR for a company that operates a factory manufacturing fiberglass. There are several hundred empl

Details on advanced accounting paperthis paper is intended

DETAILS ON ADVANCED ACCOUNTING PAPER This paper is intended for students to apply the theoretical knowledge around ac

Create a provider database and related reports and queries

Create a provider database and related reports and queries to capture contact information for potential PC component pro