Caenorhabditis elegans is an approximately 1 mm long nematode (worm) that lives in the soil and eats bacteria such as Pseudomonas. Scientists have determined that when C. elegans is hunting for food, the worms have different patterns of movement that depend on the location and quality of the food source. Scientists hypothesized that C. elegans might be attracted to certain chemicals produced by Pseudomonas. They tested this hypothesis by placing 100 C. elegans in the center of each of a series of petri dishes containing a layer of agar over which the worms could move. A drop of a test chemical diluted in ethanol was placed at one edge of each dish and an equal-sized drop of ethanol was placed at the opposite edge of the dish. The scientists determined the number of worms to reach each spot over a period of time.
(a) Describe why the location and quality of food sources in the soil are sometimes likely to stimulate random movements by C. elegans, but at other times are more likely to stimulate directed movements
(b) Justify the scientists’ use of two different spots on each petri dish and the counting of worms at each of the two spots.
(c) Under harsh environmental conditions, C. elegans produces a pheromone, a complex of molecules that affects other C. elegans. One effect of the pheromone is to cause developing larvae to temporarily arrest as larvae rather than mature to reproductive adults. Predict the relative amount of pheromone most likely produced by C. elegans that are only weakly attracted to one of the test chemicals.
(d) Provide reasoning to justify your prediction with respect to how the predicted amount of pheromone is beneficial to the worms that are only weakly attracted to the chemical.

Answers

Answer 1

Answer:

a)The response indicates that if C. Elegans doesn't find an adequate food source, it would stimulate random movement as they hunt. However, if they find an adequate food source, it would stimulate directed movement.

c)The relative amount of pherome produced by C. elegans that is only weakly attracted to one of the test chemcials is reduced

d)The response indicates that weak attraction to a chemical signals that the chemical is not produced by a good food source indicating that food is lacking in the environment. It also indicates that if food is lacking, it is beneficial for some larvae to undergo temporary developmental arrest until increased food can support more C. Elegans.

Explanation:

Above


Related Questions

Hi ANSWER FAST
PLESE

Answers

Answer: Swarms of ants accomplish tasks by working together

Explanation:

In the passage we are shown the existence of ''Swarm intelligence'' which is the tendency of insects like ants and termites to work in a group towards a certain goal without being told what to do each step of the way.

We are given an example of how ants accomplish tasks by working together in swarms when the ants form a bridge to get from a leaf to a tree branch. Ants are very small creatures but because they work in swarms, they are able to get things done more efficiently and effectively.

How do you identify yourself in terms of race and ethnicity? Are there special occasions or situations in which you are more likely to display your ethnicity or race? Do you identify with more than one racial or ethnic group or know anyone who does? What does this tell you about the origin of these categories?

Answers

The correct answer to this open question is the following.

How do you identify yourself in terms of race and ethnicity?

I identify myself as a Hispanic-American individual.

Are there special occasions or situations in which you are more likely to display your ethnicity or race?

Yes. I feel very proud of my Hispanic heritage. And at the same time, I have full respect for American culture. So it is very possible to love both cultures. I do.

I do not hide my Hispanic background. It is part of me. So it is part of my traits as an individual.

Do you identify with more than one racial or ethnic group or know anyone who does?

As I have said, I am very proud to be a Hispanic-American person. I feel good having friends from other races and ethnicities. I do not care what the color of the skin is in other people. For me, they are interesting people that deserve my full respect.

What does this tell you about the origin of these categories?

Unfortunately, these categories were created to dive. And as we see by the recent events regarding race segregation, some people still think race is an important issue.

I support diversity and welcome any form of thinking.

What weather condition often happens at the same time as lightning?

Answers

Answer:

I'm pretty sure the answer is Thunder

Three Links between unemployment and crime?

Answers

Can you be more specific?
A one percent increase in the unemployment rate will increase the violent crime rate by 14.3 per 100,000 inhabitants. ... Surprisingly, a unit increase in GDP per capita will increase the violent crime rate by . 0051 per 100,000 inhabitants, and is statistically significant at the 5% level.

What is the legacy of Jim Crow laws on the Civil Rights Movement in Louisiana?

Answers

Answer:

Jim Crow laws and Jim Crow state constitutional provisions mandated the segregation of public schools, public places, and public transportation, and the segregation of restrooms, restaurants, and drinking fountains between white and black people.

Which person is showing media literacy?

Answers

Answer:

Leonardo shows the best media literacy

Answer: C. Leonardo using the internet to analyze something he saw in film

Define sexual inequality in various societies

Answers

Answer:

Sexual inequality refers to the unequal position of individuals based on their gender. Thus, this concept refers to the different possibilities, rights and prerogatives that men and women have in their daily lives, according to their gender condition, where generally men are in a better position than women in this regard.

In recent decades, gender equality between men and women in relationships has grown. But still most of the power in a relationship lies with the man.  In addition, although more and more women have entered paid work from the second half of the twentieth century onwards, traditional gender roles are still present. Women choose (or are forced to choose) to play a greater role in the household and in the education of the children.

As a result, women who also have a paid job work approximately 18 hours a week more in the household than men. It turns out that modern couples are trying to justify this. Arguments are that women would be better at housework than men, or that the man has a tougher job that makes great demands on him.

Please showcase your problem solving abilities by answering the following:

Detective Schaunke gathered up Alex, Taylor, and Peyton yesterday, because one of them was suspected of having stolen Charlie's bicycle. The trio of suspects made the following statements during questioning: Alex: I'm innocent. Taylor: I'm innocent. Peyton: Taylor stole the bike. If only one of these statements is true, who stole the bike? How do you know?

Answers

Answer:

I believe Taylor stole the bike because 1) he followed the exact response of the first person brave enough to answer and Peyton did not say he was innocent. He tried to comply with the police.

Explanation: the guilty party often at a loss for words to decriminalize himself will simply mimic another’s response. Taylor had the longest time to realize the severity of the crime and therefore told the Police the truth.. the words “ I’m innocent coming from boys is a little rare.. they would have blurted out, it wasn’t me..or I didn’t steal it.. to say I’m innocent, is a highly verbose word that one would use in a court of justice..

why does country need healthy active and educated citizens ?​

Answers

So the future is protected. We need educated citizens to run the country and help everyone else. For ex. If we didn’t have doctors, we wouldn’t have cures to diseases or anyone to help us when we’re sick.

Which of the following information would be found in the Georgia constitution but NOT in the United States Constitution? 43a *
A Information on the structure of the Legislative Branch
B Information on the titles of the officers in the Executive Branch
C Information on how taxes will be used to fund education
D Information on how to create courts for the Judicial Branch

Answers

Answer:

c

the constitution outlines the other 3. but I don't think it mentions education

Answer:

A

Explanation:

the point Word can You won't look

mention two characteristic of multiculturalism?​

Answers

multicultural society, cultural diversities (cultural varieties), native language, schooling educational programs. Today many contemporary countries are characterized by multiculturalism (cultural varieties), multilingualism, and different ethnic and confessional views.

Complete this for brainliest and 100 points. No answers against the rules. If you put one that is against the rules, you will be reported and your account will receive notification of that.

Answers

Answer:

Number 1 and 2 are correct. Number 3 is "yes". Number 4 is "yes". Number 5 is "no". Number 6 is "no". Number 7 is "yes". Number 8 is "no".

Explanation:

Number one isn't fair because the juvenile wouldn't know what to say and would be confused about what's happening or going to happen because they didn't have enough time to prepare. Number 2 isn't fair because she might say something that she didn't know she was/wasn't supposed to say that the lawyer would have told her. Number 3 is fair because they aren't supposed to lie in court and the judge needs to know what happened to know how much trouble the person gets and who gets it. Number 4 is fair because since the person is underage and doesn't have enough money to buy a lawyer, the court should assign one to the juvenile. Number 5 is no because the judge or the person going against the juvenile could say something that never happened or never been said at the hearing. Number 6 is no because there's nothing against the juvenile about what happened and he/she could be innocent. Number 7 is yes because the court needs all the evidence and proof about what happened so the judge knows what to do. Number 8 is no because the parents might not be able to make it because they might forget the date of the hearing and they need writing for when the date is and where the hearing is, incase they forgot. I really hope i helped.

Answer:

efefefefef

Explanation:

what's the full form of ccmc

Answers

Answer:

CCMC. Commission for Case Manager Certification.

Explanation:

hope it helps

The sun's gravitational pull:

HINT: THERE IS ONLY ONE CORREC ANSWER I WILL GIVE BRAINLIEST IF UR CORRECT PLS HELP ASAP!!!!!

1. is less than that of the earth
2. causes the phases of the moon
3. keeps the planets in orbit
4. is very weak

Answers

Number 3 keeps the planets in orbit.

The process of settlement formation, expansion, and change is called
A) suburbanization.
B) urbanization..
C) post modern expansion.
D) city growth
E) all of the above.

Answers

The answer is b


The process of settlement formation, expansion, and change is called urbanization
I think it’s C Bc I just read it so yeahhhhhhhhhh please sorry if it’s wrong

Do you think race is biologically real?

Answers

Answer:

yes

Explanation:

by biological nature, race is real. you are born with ties to your country. where youre from, you can see it in your personality and looks.

although its real, theres no reason to discriminate.

Can someone help me with question 7 pls?!

Answers

The first one Consume resources faster than we can replenish them

What country was the source of contention between Germany and France and why? (Site 1)

Answers

Answer:

Russia

Answer: Germany was planning to attack Russia and Germans knew that France would honor the alliance with Russia. Since a war on two fronts was certain they decided to strike first so they would keep the initiative

Which is an example of active listening during a formal discussion?
a.creating questions to ask
b.using relevant evidence c.presenting ideas clearly
d.responding to questions

Answers

Answer:

A, creating questions to ask

Explanation:

Which term best describes the agricultural technique shown below?'
A. Terracing
B. Irrigation
C. Bioengineering
D. Monoculture

Answers

Answer: A. Terracing

3 possible solutions to rise above unemployment​

Answers

Answer:

entrepreneurship

choose course that are more needed in a country

Individuals seem to fare worse psychologically after ending a less contentious marriage than those ending a very contentious marriage.
Group of answer choices

Answers

Answer: True

Explanation:

When individuals end a very contentious marriage, they fare better because they will feel a sense of relief at not having to experience the conflict they went through in the marriage and they will be less likely to miss their ex-partners as a result.

When individuals in less contentious marriages end it however, they tend to fare worse in general because they may still harbor feeling for the other as they did not experience a lot of conflict. This makes getting over the ex-partner harder.

Round 1.4279 to the nearest thousandth

Answers

Answer:

1.428

Explanation:

Place value can be defined as the numerical value representing a digit owing to its position in a number. Some examples of the various place values used in representing each digit are tenths, hundredths, thousandths, unit, tens, hundreds, thousands etc.

For example, in the number 1.4279;

The place value of 1 is units.

The place value of 4 is tenths.

The place value of 2 is hundredths.

The place value of 7 is thousandths.

The place value of 9 is ten thousandths.

The digit representing thousandths in 1.4279 is 7.

Therefore, rounding up to the nearest thousandth, we have;

1.4279 = 1.428.

Based on psychological research, which has found a biological basis for sexual orientation, which of the following people are less likely to identify as gay?


1. Aziz, whose adoptive parents are a married gay couple

2. Guanyu, who has three gay cousins on his mother’s side of the family

3. Jamal, whose identical twin brother is gay

Answers

Answer:

3

Explanation:

Because his twin brother is gay and no one else

Answer:

2. Guanyu, who has three gay cousins on his mother’s side of the family

Explanation:

Just because Guanyu's cousins are gay doesn't mean they are too.

4. Where did the British
explore and colonize?

Answers

Answer:

The first permanent British colony was established in Jamestown, Virginia in 1607. Over the next several centuries more colonies were established in North America, Central America, South America, and the Caribbean.

Explanation:

I hope this helps and pls mark me brainliest :)

6. The U.S. gained unrestricted access to the Mississippi River and New Orleans, thus helping the
American economy by?
A. sending troops across the river into Spanish territory
B. signing an alliance with France against Spain
C. negotiating the Pinckney Tifeaty with Spain
D. none of the above

Answers

Answer:

C. It negotiated the Pinckney Treaty with Spain.

Explanation:

Why were the zhou able to overthrow the Shang dynasty with little trouble?

Answers

Answer:

The Zhou created the Mandate of Heaven: the idea that there could be only one legitimate ruler of China at a time, and that this ruler had the blessing of the gods. They used this Mandate to justify their overthrow of the Shang, and their subsequent rule

Explanation:

help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answers

Answer:B

Explanation:

The brakes of the train that Casey Jones is driving have just failed. There are five people on the track ahead of the train. There is no way that they can get off the track before the train hits them. The track has a side track leading off to the right, and Casey can hit a button to direct the train onto it. Unfortunately, there is one person stuck on the side track. Casey can turn the train, killing one person, or he can allow the train to continue onwards, killing five people.
What would Kant say to do and why? (Be sure to use his concepts of duty and categorical imperative.)

Answers

Answer: Kant would say that Casey should not turn the train, because, even if she could save the lives of five people by killing one person, she would be violating that one person´s right to live.

Explanation:

In Kant´s deontological ethical theory, the basic law is the categorical imperative, which dictates that an action should be considered good based on the motive behind it, despite the actual outcome of such action. Right and wrong depend on the duties and obligations people have. For example, our duty is not to kill. However, the inflexibility of this philosophy leads to counterintuitive conclusions, such as the decision to allow five people to die instead of only one.

HELP PLEASE

Look at the map and select the correct answer.


Which region’s natural resources make it a good place to farm?


A. 2

B. 3

C. 4

D. 1

Answers

B is the correct answer because farming is common due to the fertile soils; cattle, goat and sheep ranching are all thriving industries in the region as well as rivers escarpments, grasslands, hardwood trees are only some of the many beautiful geographic topographies this region has to offer.
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