b) Identify a dependent variable in the experiments. Identify the reasoning of the scientists when they tested the number of colonies produced by strains C3-PBB and C6-PBB . The scientists also analyzed the number of colonies produced from each of the environmental and clinical isolate strains when the strains were plated on a growth medium lacking the toxic chemical. Justify this analysis.

Answers

Answer 1

A dependent variable is the number of colonies produced. The experiment gives a useful insight into the toxicity of the chemicals.

A scientific experiment must always have a dependent and an independent variable. A dependent variable is the variable whose outcome is being determined by manipulating the independent variable which in this case is the presence or absence of the chemicals.

Toxicity of chemical substances is a very important information to scientists as such this experiment is very important because it highlights the toxicity of the chemicals to living things.

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Related Questions

Turn all these sequences into Mrna instead of DNA

Amino Acid Sequence
MET-VAL- SER-LEU-STOP
MET-VAL-SER-LYS-STOP
MET-LEU-LEU-LEU-PRO-STOP
MET-LEU-LEU-SER-ALA-STOP
MET-ALA-VAL-VAL-STOP
MET-VAL- ALA-ALA-STOP

Answers

Answer:

use this to help you I'm sure you're teacher already reached you how to used this.

Can someone help me asappp

Answers

Answer:

im 90% sure its D

Explanation:

well

I think it’s D sir it’s easy

A student is observing a single-celled alga and knows that it undergoes photosynthesis and respiration. Which question could the student ask to find out how it can do both processes?

Answers

The options associated with the question is :

Are the inputs of photosynthesis the same as the outputs of respiration?

Are the inputs of photosynthesis the same as the inputs of respiration?

Is water needed for the processes of respiration and photosynthesis?

Is carbon dioxide needed for the process of photosynthesis?

Answer:

The correct answer is - Are the inputs of photosynthesis the same as the outputs of respiration?

Explanation:

To understand that it is able to perform both the process photosynthesis and cellular respiration by this single cell of alga it is required to understand the process of both processes and how they provided to the alga.

Photosynthesis is the process that converts water and carbon dioxide into glucose and oxygen as the output or products. Glucose is further used in the cellular respiration with oxygen to produce water and carbon dioxide. So it make balance of the inputs and outputs in the both reaction so it can be understand by asking if the inputs of photosynthesis the same as the outputs of respiration?

Photosynthesis and respiration both are shown by algae because they need light to make food.

Algae are a diverse group of predominantly photosynthetic organisms, including cyanobacteria, green algae, and other eukaryotes. They account for more than 50% of the photosynthesis that occurs on Earth. Photosynthetic efficiency is higher in algae than in higher plants. Algae use carbon dioxide for cellular respiration. It binds CO2 and reduces the amount in the atmosphere.

The questions which students can ask are :

Are the inputs to photosynthesis and the outputs to respiration the same?

Are the photosynthesis and respiration inputs the same thing?

Is it true that water is required for respiration and photosynthesis?

Is carbon dioxide required for photosynthesis?

what are algae?

A group of photosynthetic, aquatic, marine, true root stems leaves bearing organisms.

thus it concludes algae can perform both cellular respiration and photosynthesis.

To know about algae refers to the link:

How does the burning of fossil fuel affect the carbon cycle?

A.The more fossil fuels are burned, the less carbon dioxide enters the atmosphere, less than can be absorbed by plants or the ocean.

B.The more fossil fuels that are burned, the more carbon dioxide enters the atmosphere, more than can theoretically be absorbed by plants or the ocean.

C.The less fossil fuels are burned, the more carbon dioxide enters the atmosphere, more than can be absorbed by plants or the ocean.

D. The more fossil fuels are burned, the more oxygen enters the atmosphere, more than can be absorbed by plants or the ocean.

Answers

Answer:

B.The more fossil fuels that are burned, the more carbon dioxide enters the atmosphere, more than can theoretically be absorbed by plants or the ocean.

Explanation:

The most reasonable answer.

The more fossil fuels that are burned, the more carbon dioxide enters the atmosphere, more than can theoretically be absorbed by plants or the ocean.

What are fossil fuels?

Fossil fuels are made from decomposing plants and animals. Coal, oil, and natural gas are examples of fossil fuels.

When fossil fuels are burned they release a large number of carbon dioxide a greenhouse gas in the air. This leads to increases in the temperature of the globe. If the temperature of the earth increases it leads to the melting of icebergs.

Coal, oil, and petrol are some examples of fossil fuels. Oil releases a huge amount of carbon when burned, approximately one-third of the total carbon on earth.

Carbon dioxide is a greenhouse gas, this gas generally releases trapped heat in our atmosphere.

Therefore, The more fossil fuels that are burned, the more carbon dioxide enters the atmosphere, more than can theoretically be absorbed by plants or the ocean. Option B is correct.

To learn more about greenhouse gases, refer to the link:

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hurry plz due in five min

Answers

Answer:

Its B the 2nd option

Explanation:

.......

A student conducted a comparative investigation to test the hypothesis that different areas of New York City have different levels of air pollution. Which is a likely benefit of this comparative investigation?

A It provides her with a large amount of information about air pollution in New York City.

B It provides her with results that are valid for a long time.

C It requires that she observe a limited number of variables.

D It allows her to learn about the causes and effects of air pollution in major cities.​

Answers

Answer: A. It provides her with a large amount of information about air pollution in New York City.

Explanation:

A comparative investigation is when data is collected in order to make a particular comparison.

With regards to the question, the student conducted a comparative investigation in order to test the hypothesis that different areas of New York City have different levels of air pollution.

The benefit of this study done by the students is that it will provide her with a large amount of information about air pollution in New York City. The area with the highest air pollution, what causes air pollution and other necessary information can be gotten.

Therefore, the option is A.

Evaluate Claims A student claims that the four types of macromolecules make up all of the important compounds of the human body. Provide evidence and reasoning to support or refute this claim.

Answers

Answer:Hi I’m sorry I’m not helping I just really need to answer something for points so I can ask a question

Explanation:

It’s due tomorrow and it’s for a grade so im freaking out

People have built canals and levees to divert water away from its natural flow and prevent floods in residential areas near Florida's Everglades.How have these changes affected the Everglades

Answers

Answer:

The everglades begins to start flooding

Explanation:

The everglades soon becomes a wetland and all the area has vast amounts of water making it harder to move on and why it has the wet season, which there is the most water.

Answer:

Areas of wetland have been filed in for houses

Explanation:

Which two elements are always found in amino acids?

Answers

Answer:

carbon and oxygen

Explanation:

hope this helps :)

Why does ice become less dense than water?

Answers

Ice actually has a very different structure than liquid water, in that the molecules align themselves in a regular lattice rather than more randomly as in the liquid form. It happens that the lattice arrangement allows water molecules to be more spread out than in a liquid, and, thus, ice is less dense than water.

Celula Conjunto de células especializadas que tienen una forma similar y una actividad determinada Conjunto de organos que trabajan de forma integrada y cumplen una función especifica en el organismo. Nivel de mayor complejidad. Constituido por sistemas, que realizan sus funciones en forma coordinada Estructura formada por diferentes tipos de tejidos, que coordinan sus funciones para realizar una tarea especifica Unidad básica de todos los organismos Sistema Tejido Organismo Organo

Answers

Answer:

Célula: Unidad básica de todos los organismos

Tejido: Conjunto de células especializadas que tienen una forma similar y una actividad determinada

Órgano: Estructura formada por diferentes tipos de tejidos, que coordinan sus funciones para realizar una tarea especifica

Sistema: Conjunto de órganos que trabajan de forma integrada y cumplen una función especifica en el organismo.

Organismo: Nivel de mayor complejidad. Constituido por sistemas, que realizan sus funciones en forma coordinada

Explanation:

Los organismos pueden ser unicelulares o pluricelulares. Estos últimos tiene muchas células, lo que hace que tengan estructuras mucho más complejas. En ellos hay distintos niveles de organización celular. Se le llama así porque es la célula la unidad básica de absolutamente todos los organismos. En el segundo nivel encontramos los tejidos, en el tercer lugar los órganos, luego en el cuarto nivel los sistemas y por último todos ellos constituyen un organismo, que es el quinto nivel de organización celular.

A su vez, cada uno de estos elementos mencionados en los distintos niveles de organización celular tienen sus propias características y funciones que hacen que se puedan clasificar y dividir en distintos tipos.

(2) Which of the following describes the movement of particles down/ with a concentration gradient and how ?
Question options:

a)

Osmosis

b)

active transport

c)

diffusion

d)

both osmosis and diffusion

Answers

Answer:

Both osmosis. And diffusion


Which type of seed do you think the ground finches preferred? Why do you think this?

Answers

Answer: soft seeds

Explanation:

Tiny, soft seeds that are easy to crush are preferred by the medium ground finch to feed. During droughts, however, they often consume the larger seeds on the island when small seeds are not as available.

30 POINTS!! HELP ME PLZZ I NEED HELP WITH THIS!!

Answers

Answer:

c

Explanation:

“every cell stems from another cell”

He observed how cell division produced two daughter cells hence all living cells come from pre-existing.

The structure below is used in agriculture. What could be a benefit of this
technology?
A. It can be used to grow food in areas with a shortage of land.
B. It can create food using more land than a traditional farm.
C. It can be used to grow food without sunlight.
D. It can create unemployment problems in the farming industry.

Answers

Answer:

A. It can be used to grow food in areas with a shortage of land.

Explanation:

Answer:

A

Explanation:

A yellow-skinned CHNOPS meets the blue-skinned CHNOPS of their dreams. They get married and have a green-skinned CHNOPS baby. What type of inheritance (Complete dominance, Incomplete dominance, or Co-dominance) is illustrated by this example? Pick the best answer with the correct justification
A.Complete dominance, because it blends
B.Incomplete dominance, because you see two traits
C.Co-Dominance - because it blends D.Co-Dominance, because you see two traits
E.Incomplete dominance, because it blends
F.Complete dominance, because you see two traits​

Answers

Answer:

uwiwiwuwwieh

Explanation:

Answer

co-dominance

recessive

Explanation:

100 on edge trust me!!

Graves’ Disease is an autoimmune disorder that causes an overproduction of the hormone produced in the thyroid. These hormones are responsible for cellular metabolism. What would this disorder probably result in?

Answers

Answer:

Explanation:

Graves' disease is an autoimmune disorder in which antibodies produced by your immune system stimulate your thyroid to produce too much T4. It's the most common cause of hyperthyroidism. Hyperfunctioning thyroid nodules (toxic adenoma, toxic multinodular goiter or Plummer's disease).

What gives a male widowbird greater reproductive success?

Answers

Answer:

Food and feeding

The long-tailed widowbird's diet generally consists of seeds, supplemented occasionally by arthropods. The birds do most of their foraging in flocks on the ground, though they are occasionally observed hawking insects airily.

What best describes the role of molecular oxygen (O2) in aerobic respiration?

A. It accepts electrons when reacting to form water.
B. It combines with carbon and hydrogen to form glucose.
C. It is released when glucose breaks apart.
D. It reacts to form carbon dioxide and water.

Answers

B
Expiation

Sorry if it’s wrong

Aerobic respiration involves the reaction of oxidation which involves the acceptance of electrons when the molecular oxygen reacts with protons to form water molecules. Thus, the correct option is A.

What is Aerobic respiration?

Aerobic respiration is the chemical process in which molecular oxygen is used to make the energy in the form of ATP from carbohydrates. It is also called as aerobic metabolism, and oxidative metabolism.

Aerobic organisms can use molecular oxygen (O₂) to generate energy in the form of adenine triphosphate (ATP). The role of molecular oxygen in the process of cellular respiration is to act as the end acceptor of electron. As the electrons are dropped off at the inner mitochondrial membrane during the process of cellular respiration, they travel through the electron transport chain and  are finally accepted by the molecular oxygen to form water.

Therefore, the correct option is A.

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Help!!!
What are the tools and technology used to carry out PCR tests ????

Answers

Answer:

Equipment: Thermal cycler is a technology that can change the temperature of the DNA segment. A thermal cycler can raise and reduce the temperature quickly. This allows the PCR process to happen over and over again.

Tools:

Taq polymerase build complementary DNA strands

DNA primers attach to each end of the target sequence

DNA nucleotides or dNTPs make up the DNA

Explanation:

How far is the sun from the earth and how long does it take to get to the sun from earth?

Answers

Answer:

Earth's closest approach to the sun, called perihelion, comes in early January and is about 91 million miles (146 million km), just shy of 1 AU. The farthest from the sun Earth gets is called aphelion. It comes in early July and is about 94.5 million miles (152 million km), just over 1 AU.

Which type of fossils is MOST helpfu
in understanding what the climate w
like for a region in the past?
A.fossils of plants
B. fossils of microorganisms
C. fossils of birds
D. fossils of animals

Answers

Answer:

I would say A). The animals in an area can fluctuate and diversify, while plants can't move and will die if conditions are too intense, leaving only the ones accustomed to the climate to survive.

(pic attached) can anyone help me?

Answers

Muscular and Skeletal





Advances in technology have helped many industries, including agriculture. Which agricultural application is most likely

to be affected by new advances in DNA technology from the Human Genome Project?

O a researcher who is investigating selective breeding of livestock

O a farmer who is planning a harvest schedule for genetically modified crops

O a plant scientist who is modifying the genetic information of crop plants in a laboratory

O a conservationist who wants to find water sources in drought-prone places

Answers

Answer:

O a researcher who is investigating selective breeding of livestock

Explanation:

The Human Genome Project (HGP) aims at determining the full nucleotide sequence of the human genome, which can be used for the identification, characterization and mapping of the human genes. The livestock genome sequence exhibits a high level of conservation with the genomes of many mammals including humans. In consequence, the information obtained by mapping genes from the HGP can be of help to map livestock genes. The livestock genome mapping projects have greatly been helped by the increasing availability of human and murine genome sequences, which has been used in comparative genomics for the identification of candidate genes involved in animal traits.

Answer:

A

Explanation:

Whats the difference between a mixture and a compound? Mixtures are impure and compounds are pure, but how are mixtures formed? Are they formed with elements combined are something else? Please help! Dont copy and paste

Answers

Answer:

A compound is chemically bonded whereas mixtures are not. Compounds have a set amount of atoms that are conjoined, maybe through the process of heat, acid, water, etc, but, mixtures two things roughly mixed together, not chemically bonded.

Explanation:

Hi rosanna, im rlly bad at science lol

The giant african land snail is an invasive species that is also the largest snail ons earth what is most likely consequence of introducing this invasive species into a stable ecosystem?

A. The native snail species will change their diet therefore destabilizing the ecosystem.

B. The native snail species will move to another area allowing the ecosystem to remain stable.

C. The native snail species will share their food with the invasive species stabilizing the ecosystem.

D. The native snail species will compete for resources with the invasive species and destabilize the ecosystem ​

Answers

Answer:

D. The native snail species will compete for resources with the invasive species and destabilize the ecosystem ​

Explanation:

In Ecology, an invasive species refers to a species of organism that is foreign i.e. non-native to a particular habitat or environment. They are characterized by the ability to proliferate in growth and compete for space and nutrients with the native species in the habitat they are introduced to.

In this case, the giant african land snail, which is an invasive species, if introduced into a stable ecosystem will compete for resources with the native species of that ecosystem leading to the destabilization of the ecosystem.

I don't understand this. Can someone help me?

Answers

Answer:

I just got points for being useless

Explanation:

LOL

H is the correct graph hope this helps

DNA and RNA are both types of —
A. enzymes
B. polysaccharides
C. proteins
D. nucleic acids

Answers

both DNA & RNA are the main types of nuclei acids so D
Answer:
D. DNA and RNA are both types of nucleic acids

Kelvin's cow is showing signs of poor health. The cow is staying away from the herd and not alert in its environment. The veterinarian believes
that the cow is affected by some type of infection. He also states that the lack of white blood cells in the cow is making it less resistant to the
infection. Which system of Kelvin's cow is not functioning properly?
ОА
muscular system
OB
endocrine system
Ос.
nervous system
OD
circulatory system

Answers

Answer:

D. circulatory system

Answer:

D. circulatory system

Explanation:

pls help
Molecules move in and out of a cell by DIFFUSION. The picture shows a cell and molecules both inside and outside the cell. How will the molecules in this illustration move as a result of diffusion?

Answers

Answer:

They will move into an external environment

Explanation:

I had this question on my test last week

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En el siguiente diagrama, Midtown se encuentra exactamente a mitad de camino entre Uptown y Downtown. Cul es la distancia entre Midtown y Lower East Side?A-2.6 kmB-1.5 kmC-2.1 kmD-90 grados A potter's wheel is a uniform disk of mass of 10.0 kg and radius 20.0 cm. A 2.0-kg lump of clay, roughly cylindrical with radius 3.0 cm, is placed at the center of the wheel. The wheel initially rotates at 30.0 rev/min. The clay then flattens into a disk of radius 8.0 cm. What is the final angular speed of the wheel?a. 29.6 rev/min b. 29.2 rev/min c. 30.8 rev/min d. 30.4 rev/min e. 30.0 rev/min what is downpayment? 2.4x + 4.6x = 28 Could someone help me with this problem I need it. Twice the sum of a number and five is equal to six You are interviewing a new member of the psychology department for the university newspaper. The faculty member states, "Psychology has historically devoted too much attention to pathology, weakness, and suffering." This faculty members views are MOST similar to the views held by a mass of 25kg on a ramp at an angle of inclination 30 degrees to the horizontal, is oulled with a force of 75 kg an angle of 20 degrees to the ramp what is the frictional force if it is pulled up the ramp at constant speed 30 POINTS! PLEASE HELP WITH THIS QUESTION! Self-portraits are typically done by looking at a picture of yourself or by looking in the mirror.TrueFalse What is the slope of (10, 10) and (2, 1). Can anyone help me ? Find the values of x and y. Line v has an equation of y=10/7x + 8. Line W is perpendicular to line v and passes through (-7,4). What is an equation of line w? Need some help with this question!! Into a mixed number btw. Marcos talks to his grandfather in Alabama for about 95 minutes per month about how long does her talk each day on average? (Hint: use 1 month=30 days) How are graphs used to represent and analyze acceleration? please help! Linda's account has a balance of $45.50. If she owes the bank more than $30, her account gets closed. Which of the following is true about Linda's account? find H.C.F of 2x+4 and x^2-4 Does the graph represent a function? Y=-6x+10. Y=-6x+3Solve the system of equations