If an unknown Gram-positive bacteria was streaked onto a MacConkey agar plate, the researcher would typically expect to find no growth or very limited growth after 24 hours.
MacConkey agar is a selective and differential medium primarily designed for the isolation and differentiation of Gram-negative bacteria.
MacConkey agar contains bile salts and crystal violet, which inhibit the growth of most Gram-positive bacteria and favor the growth of Gram-negative bacteria. It also contains lactose as a carbohydrate source and neutral red as a pH indicator.
Gram-negative bacteria capable of fermenting lactose produce acid as a byproduct, which lowers the pH of the medium and causes colonies to appear pink or red. Non-lactose fermenters, including most Gram-positive bacteria, do not produce acid and typically appear colorless or pale on MacConkey agar.
Therefore, if an unknown Gram-positive bacteria was streaked onto a MacConkey agar plate, the researcher would not expect to see significant growth or characteristic color changes on the plate after 24 hours, as the medium is not optimal for the growth and differentiation of Gram-positive bacteria.
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Which events are most common along tectonic plate boundaries
A) erosion and earthquakes
B) hurricanes and tsunamis
C) earthquakes and volcanoes
D) tidal waves and volcanoes
Answer:
C. Earthquakes and volcanoes
Explanation:
finished this topic in my class.
What is an extreme disturbance to any ecosystem? (1 point)
Elk overgrazing
Hurricanes
Coral bleaching
Extreme temperature change
When an ecosystem is disturbed by fire or toxic chemicals, it affects (1 point)
One type of habitat in the ecosystem
One type of food source in the ecosystem
Living things in that ecosystem
Only a particular species in that ecosystem
If deer are not hunted every season, a potential result is (1 point)
The predator population will decrease
The deer population will decrease
The plant population will increase will increase
The smaller herbivore population will decrease
An example of a severe disruption to an ecosystem is (1 point)
A seasonal flooding of a river
A thunderstorm that knocks down some trees
Repurposing a building in a downtown area
The loss of a river system due to contamination
If an ecosystem irreversibility destroyed, species unable to travel or adapt will (1 point)
Find a new food source
Die out in the area
Find additional mates
Grow in population
Answer:
1.) extreme temperature change
2.) living things in that ecosystem.
3.)the smaller herbivore population will decrease.
4.) the loss of a river system due to contamination.
5.) die out in the area.
Explanation:
Just took the QC
What can be considered as an extreme disturbance to any ecosystem is :extreme temperature change.
Whenever, there is a disturbance in terms of fire or toxic chemicals to ecosystem, then : living things in that ecosystem.
In a case, whereby no one hunt deer, then there would be decrease in smaller herbivore population.
loss of a river system due to contamination can be considered as a of a severe disruption to an ecosystem.
When there is irreversibility destroying of ecosystem, then :species unable to travel or adapt will die out in the area.
An ecosystem can be regarded as geographic area which encompass plants, animals as well as weather relate together.One of disturbance that occurs in an ecosystem is extreme temperature.Learn more at:
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Which part of the brain stem controls the heart rate and respiratory rate?
pons
thalamus
medulla oblongata
midbrain
Answer:Medulla
Explanation:
Answer:
Medulla Oblongata
Explanation:
The primary role of the medulla is regulating our involuntary life sustaining functions such as breathing, swallowing and heart rate. As part of the brain stem, it also helps transfer neural messages to and from the brain and spinal cord. It is located at the junction of the spinal cord and brain.
Despite his fear of germs, Howard Hughes neglected his own hygiene despite having those around him follow strict cleanliness practices. Hughes had these odd behaviors because __________.
A.
he believed he was unable to escape any infection
B.
he developed obsessive-compulsive disorder at an old age
C.
he thought he would be contaminated from the outside
D.
his paralysis at a young age prevented him from being self-sufficient
Answer: it’s c he thought he would be contaminated from the outside
Explanation:
I took the test
Howard Hughes neglected his own hygiene despite having those around him follow strict cleanliness practices. Hughes had these odd behaviors because he thought he would be contaminated from the outside.
What is importance of cleanliness?Cleanliness gives rise to a good character by keeping body, mind, and soul clean and peaceful. The cleanliness only which helps to improve our personality by keeping clean externally and internally.
Thus, option "C" is correct.
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Briefly describe the impacts of climate change on ecosystem
.
Answer:
can alter where species live, how they interact, and the timing of biological events, which could fundamentally transform current ecosystems and food webs. Climate change can overwhelm the capacity of ecosystems to mitigate extreme events and disturbance, such as wildfires, floods, and drought.
Explanation:
In living things, cells must be in a _____________________ solution where water leaves and enters the cell at _________________________________________.
Answer:
isotonic; the same rate
Explanation:
Cell Theory as as commonly known gives the best definition for cells. All organisms that ever existed are made up of one or more cells. The theory state that the cell is a basic unit, that is of all living things, and that all cells come from cells that have existed.
For cell that is in an isotonic solution,no net flow of water into or out of the cell will be experienced, the volume of the cell is at a state of stability. When the level or concentration of solute in and out of the cell is at the same pace or level, the the cell membrane does not allow solutes to cross, leading to the solution being isotonic to the cell.
A student has several pet hermit crabs. He wants to determine how the hermit crabs choose which shell they inhabit. He thinks that the crabs choose their shells based on the shells' color and wants to design an experiment to test this. Which of these steps should the student include in his experiment? A. He should add shells that are different colors, but the same size and type, to the tank and observe which shells the hermit crabs choose. B. He should observe hermit crabs in their natural environments and determine how shells help protect them from predators. C. He should place the hermit crabs in different tanks and change the temperatures in the tanks to see if it effects their shell selection. D. He should gather shells that are different sizes and different colors, place them in the tank with the hermit crabs, then observe which shells they choose. Reset Next Question
Which small-scale mutation would be most likely to have the least negative effect on the function of a protein?
A substitution of one base for another within the sequence
A base deletion near the start of a gene
A base deletion near the end of the coding sequence, but not in the terminator codon
A deletion of three bases near the start of the coding sequence, but not in the initiator codon
Answer:
substitution
Explanation:
has a chance to cause silent mutation, which doesnt do anything to a protein.
The small-scale mutation that would most likely have the least negative effect on the function of a protein is ; ( A ) A substitution of one base for another within the sequence.
A substitution of one base for another within the sequence of a protein will cause an insignificant/silent mutation within the protein sequence and this mutation will not be evident in the protein.
When a base is deleted either near the start of a gene or near the end of the coding sequence, it will have a significant effect because this will change the sequence of the DNA ( due to the deletion of at least one nucleotide ).
Hence we can conclude that the small-scale mutation that would most likely have the least negative effect on the function of a protein is ; A substitution of one base for another within the sequence.
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Please help me I beg you please help
Answer:
A-T
T-A
T-A
C-G
A-T
G-C
G-C
C-G
T-A
A-T
Answer:
ATTCAGGCTA= TAAGTCCGAT
Explanation:
adenine pairs with thymine with 2 hydrogen bond in DNA and cytosine pairs with Guanine with 3 hydrogen bonds .
Explain how a semi-permeable membrane works.
Semipermeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by diffusion—or occasionally by more specialized processes of facilitated diffusion, passive transport or active transport.
______ is the transfer of energy through spaces as electromagnetic waves in all directions?
A. Conduction
B. Radiation
C. Fission
D. Convection
Answer:
electromagnetic radiation Transfer of energy by electromagnetic waves across space or through matter.
Answer:
radiation
Explanation:
ii Why can you not produce plumcot seeds through reproduction between two plumcot plants?
Answer:
It's a great tree for small properties because you only need one to produce fruit. Pluots are similar fruits. ... The seeds from the cross-pollinated fruit produce a different type of tree that has some characteristics of both trees.
Explanation:
sorry
A plumcot plant is produced from the cross breeding between a plum and an apricot tree. It is hybrid fruit tree.
As the plants is a hybrid fruit tree, it is not possible to produce plumcot plants through fertilization of their seeds.
A plumcot plant is derived from the reproduction between a plum and an apricot. It takes skill and planning to be able to carry out the cross pollination. Most of the time this occurs when they are found growing near each other.
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please HELP MEEEEEEEEEEEEEEEEEEEEEE
Answer:
Yes tell the question brooooooooooooooooooooo
Explanation:
where 's your question ??:))
Biology - need ASAP. will mark brainliest
Describe the main ways in which the blood helps you to avoid infection. Include a description of the parts of the blood involved.
(6 marks)
Answer:
Blood brings oxygen and nutrients to all the parts of the body so they can keep working. Blood carries carbon dioxide and other waste materials to the lungs, kidneys, and digestive system to be removed from the body. Blood also fights infections, and carries hormones around the body.
Explanation:
What other cell types does skeletal muscle cell
associate with? How do they interact?
Explanation:
Skeletal muscle cells
Muscle cells, commonly known as myocytes, are the cells that make up muscle tissue. There are 3 types of muscle cells in the human body; cardiac, skeletal, and smooth. Skeletal muscle cells are long, cylindrical, multi-nucleated and striated
According to atomic theory, all matter is made up of particles called atoms Why is this considered to be a theory and not a law?
A. Atomic theory may change when new evidence is found that does not support the theory. A law has been proved with scientific evidence.
B. Atomic theory is a description based on observations. A law is based on mathematical calculations.
C. Atomic theory is an explanation of the nature of atoms. A law describes natural events but does not attempt to explain them.
D. Atomic theory is supported by research. A law is merely an educated guess
B
hope thats correct, not too sure tho:(
Which of the following statements is correct about air temperature?
When air temperature is higher, the weather is warmer.
Warm air falls to the ground.
Freezing air temperatures increase the chances of rain.
When air temperature is higher, the weather is colder.
Answer:
Answer is freezing air temperatures increases the chances of rain
Explanation:
Answer:
When air temperature is higher, the weather is warmer
How is food produced?
Answer:
Most food produced for the food industry comes from commodity crops using conventional agricultural practices. Agriculture is the process of producing food, feeding products, fiber, and other desired products by the cultivation of certain plants and the raising of domesticated animals. On average, 83% of the food consumed by humans is produced using terrestrial agriculture.
Explanation:
Answer:
Explanation:
Most food produced for the food industry comes from commodity crops using conventional agricultural practices. Agriculture is the process of producing food, feeding products, fiber, and other desired products by the cultivation of certain plants and the raising of domesticated animals.
What happens during the pathway of glycolysis?
A. Glucose is broken down into private
B. Carbon dioxide is produced
C. More ATP is consumed than is produced.
D. Lactic acid is produced
Answer:
the correct answer is A :Glucose is broken down into pyruvate
Answer:
If I'm correct, the glucose is broken down into pyruvate and energy.
Explanation:
I hope this helps! ^^
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How do free energy machines work?
Explanation:
The machine is plugged into an electrical source,which gets plugged the motor's wheel spinning.The machine is then unplugged and the wheel keeps spinning under its own interia. Then electrical energy is extracted from the spinning wheel.
I hope it's helpful!
Which type of organism gets energy from the sun?
Producers
All Types of Consumers
Herbivores
Carnivores
Omnivores
Decomposers
In a sex linked trait, the recessive phenotype is most often found in males because...
Answer:
X-linked recessive diseases most often occur in males. Males have only one X chromosome. A single recessive gene on that X chromosome will cause the disease. The Y chromosome is the other half of the XY gene pair in the male.
Explanation:
Why are you learning this stuff anyways.Girl????????
Earth follows an orbit as it makes a revolution around the Sun. What is the relationship between a revolution and an orbit?
Answer:
An orbit is essentially the motion of an object (be it a planet, a moon, a spacecraft) around a star, moon, or planet. Now a revolution is the movement of an object around an axis of rotation, or a centre, or another object. So the earth revolves around the sun, but the earth is also in orbit around the sun.
Plz mark me brainliest
PLZZ HELP IM DOING A UNIT ASSESMENT!!!!
What types of cells would contain cell walls and what types of cells would contain a cell membrane?
Answer:
I agree with the other person
have a good day :)
Explanation:
if epigenetic changes take place above the level of the genome , what would be an example of a change at the level of the genome ?
Answer:
epigenetics chamges take place.
Epigenetics is the examination of the way cells manipulate gene interest without converting the DNA series." Epi-"approach on or above in Greek, and "epigenetic" describes elements past the genetic code.
Epigenetic changes are adjustments to DNA that modify whether or not genes are grown to become on or off. These adjustments are connected to DNA and do now no longer alternate the series of DNA constructing blocks. Within the entire set of DNA in a (genome), all the adjustments that modify the interest (expression) of the genes are referred to as the epigenome.
Because epigenetic changes assist decide whether or not genes are grown to become on or off, they affect the manufacturing of proteins in cells. This law facilitates making sure that everyone produces the handiest proteins which might be essential for its function. For example, proteins that sell bone boom aren't produced in muscle cells.
What is the epigenetic pattern?Patterns of epigenetic change range amongst individuals, in one-of-a-kind tissues inside an individual, or even in one-of-a-kind cells inside a tissue. Environmental influences, together with a person’s food plan and publicity to pollutants, can affect the epigenome. Epigenetic adjustments may be maintained from cell to as cells divide and, in a few cases.
Hence concluded that Epigenetics changes and causes cancers, by changing the genome, epigenome, or both.
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how to control diarrhoea
Answer:
Diarrhea should go away in a few days without treatment. until you feel better, rest, drink enough fluids, and watch what you eat.
an example of prokaryotic cell is a ___ cell
Answer:
A bacterium
Explanation:
Prokaryotic cells lack a nuclear envelope, so what would be their nucleus is just kind of floating around inside of them.
Right now we have the ability for genetic modification (plants, animals, diseases, or humans). Discuss a positive or a negative use and whether you agree or disagree with it.
Answer:
There are pros and cons in genetic modification.
Explanation:
Pros: It will help with plant growth and because of global warming it can help keep the plants alive. It can also help cure some diseases and help humans stay alive with what is coming for us in the future.
Cons: If we do this, we would gain more diseases and have new mutations going on in the world. The Plants may mutate and we may lose some types of animals to new diseases.
If a cell has 40% solute and is placed in a solution with 60% water what will happen to the cell
There will be no net movement of water in or out of the cell.
Water moves out of the cell when a cell is placed in a hypertonic solution. This is a solution that contains more solute than does the cell. When a cell is placed in a hypotonic solution, water enters into the cell from the solution until the cell finally bursts. However, if the cell and the solution contain the same amount of solute, there is no net movement in or out of the cell.
We can see here that the cell has 40% solute and is placed inside a solution that has 60% water. This means that the solution also contains 40% solute. There will be no net movement of water in or out of the cell.
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A group of four students is participating in a marble race. Each marble has a different mass and the same force is applied to each marble.
Marble Data
Marble
А
Mass
(9)
30
50
70
Force Applied
(N)
60
60
60
F
H:T:
mxa
B
С
D
90
60
Which marble will experience the least acceleration?
O Marble A
O Marble B
Marble C
Marble D
Answer:
Marble D
Explanation:
According to this question, a group of four students is participating in a marble race. Each marble is said to have different mass but the same force were applied to each of them.
The relationship between the mass, force and acceleration of an object has been explained with the equation: F (force) = mass (m) × acceleration (a).
F = ma
Hence, a = F/m
Based on this, with a constant force, the acceleration is inversely proportional to the mass of an object. This means that when the mass increases, the acceleration decreases and vice versa. Based on the table showing the value for mass and uniform force for each marble, the marble with the highest mass (90) will have the least acceleration (0.66666). This marble is MARBLE D.