Dilution is necessary during pure culture preparation to reduce the bacterial load and allow readable colonies to grow.
Dilution of bacteria culture is carried out in comparison to McCfarlan standard so as to have a decent number of bacteria that will not be too numerous or too little to observe the growth of distinct colonies during culture preparation.
Without dilution, colonies may form but may be too numerous to count. Too much dilution may also lead to no growth in the culture plates.
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Which rock is an example of a chemical sedimentary rock?
-
a: coal
b: iron ore
c: shale
d: sandstone
Answer:
I think none of them since so far lime stone is the most know example of chemical sedimentary rock.
which blood vessel brings oxygenated blood from lungs to heart ?
Answer:
Pulmonary vein
Explanation:
This vein transports oxygenated blood from the lungs to the heart to be sent to other body parts.
Compared to other routes of administration, ________ is the most complicated way for a drug to enter the bloodstream.
Answer: the answer is oral consumption
Compared to other routes of administration, oral consumption is the most complicated way for a drug to enter the bloodstream.
How many ways can drugs enter the bloodstream?Substances can enter the body in different ways. Drugs can be smoked, inhaled, injected, swallowed (tablets, capsules, liquids), or applied transdermally (applied to the skin). Most of the drugs are taken orally and broken down in the gastrointestinal tract. Once the drug arrives, it is broken down by stomach acid before passing through the liver and into the bloodstream. Medicines can be taken in a variety of ways, including swallowing, inhaling, absorbing through the skin, and injecting. Each method has advantages and disadvantages, and not all methods can be used with all drugs. After the tablet is swallowed, it is usually absorbed through the stomach wall into the blood. These take effect within minutes, but usually take 1-2 hours to reach peak blood levels.To learn more about medication, refer
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How to Determine density from an experiment ?
Answer:
To find the total Volume displaced, subtract Initial Volume and Volume of Object. To calculate Density divide the Mass in grams by the Volume displaced in milliliters. Finally record whether the object floats or sinks.
Explanation:
An organism in its niche within an ecosystem is similar to?
A: a baseball player in his position on the baseball team.
B: the umpire not on a team.
C: the audience in the stands of a game.
D: the opposing team at a baseball game.
An organism in its niche within an ecosystem is similar to a baseball player in his position on the baseball team.
NICHE:Niche in biology refers to the specific role or position of an organism in its ecosystem or habitat.
The niche of an organism is specific or particular to that organism and this enables it to adapt and survive in its environment.
This explanation shows that niche can be likened to a baseball player in his specific position on the baseball team.
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Answer: A: a baseball player in his position on the baseball team.
Which statement is true?(1 point)
Mendelian traits cannot be shown on a bell curve.
Mendelian traits are controlled by multiple genes.
Mendelian traits follows a normal distribution.
Hair color and IQ are examples of Mendelian traits.
Answer:
Hair color and IQ are examples of Mendelian traits.
I don’t know how to do this. Help me please
*What is the relationship between DNA and gene expression? How do they depend on each other?*
Answer:
Gene expression is the process by which the instructions in our DNA are converted into a functional product, such as a protein. When the information stored in our DNA? is converted into instructions for making proteins? or other molecules, it is called gene expression
Explanation:
DNA makes genetic expression. DNA is a structure located in the nucleus that makes people themselves. DNA is unique to everyone, no two people are exactly the same. The way the DNA is structured and what instructions it was given affect one's genetic makeup.
Which process occurs at location W? precipitation evaporation condensation transpiration.
Answer:
Precipitation
Explanation:
If it's the graph that I am thinking of, then it is precipitation. This is where raining occurs in he picture.
The biogeochemical cycle where the water circulates from the atmosphere to the Earth surface in a continuous motion is called the water or hydrological cycle.
The process that occurs at location W is:
Option A. Precipitation
The water cycle can be explained as:
The water cycle has four main components that are evaporation. condensation, precipitation and runoff.When an atmospheric substance falls on the ground in the form of rain, snow hails etc. are called precipitation.When the water from surfaces turns into vapours and moves upwards in the atmosphere is called evaporation.The vapours in clouds turn into water droplets ready to fall as rain or snow is called condensation.Transpiration is a plant function in which surplus water is exhaled from the stomata of the leaf.Therefore, the water cycle shows precipitation.
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Please help! Multiple choice question.
Answer: A is the correct answer
Hope this helps :)
agonists generally _______ activity at the synapse while antagonists generally ______ activity at the synapse.
Agonists activate the receptor thereby increasing activity at the synapse while antagonists generally prevent agonists from activating the receptors thereby decreasing activity at the synapse.
An agonist is the component that has the ability to increase the activity carried out by another substance.The agonists work from their faculty of coupling to a cell-type receptor, in this way, they manage to generate a certain action in the cell.The antagonists are the compounds that cause the opposite when they bind to the receptor, they cause a blockade by decreasing the activation of a synaptic receptor.Therefore, we can conclude that agonists are compounds capable of increasing the action of synapse and blockers (antagonists) decrease activity at the synapse.
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these diverticula are lined with transitional cell epithelium.
Answer:
calyceal diverticula
Explanation:
there is no explanation
HELP!!! WILL GIVE MAX POINTS!! Doing a Lab Report on Natural Selection about beans. For example 20 dark red beans and 35 light red beans (kidney beans) Sample Response: When the volcano erupted, the dark red walking beans were easier to see. Thus, more dark red beans were eaten during days four, five, and six. If the pollution continued, there would be fewer and fewer dark red walking beans over time.
Questions being asked are:
1. What is the purpose of the lab?
2. What is your hypothesis for this experiment?
3. What methods are you using to test this hypothesis? (Outline the steps of the procedure in full sentences.)
4. 4. What graphs would clearly represent the trends in your data?
Your Student Guide includes information on which graphs to construct. Each graph should have the following items:
a. An appropriate title
b. Appropriate labels for each axis
c. An appropriate scale for each axis
d. The correct units for the data
Complete a rough sketch of each graph.
5. What do the data in your graphs tell you? (Explain in one or two sentences what trend is shown in each of your graphs.)
6. What does the data tell you about your hypothesis? (State how your hypothesis is either supported OR refuted by the data)
7. How does the data support your claim above? (Explain your statement above. Be sure to refer to specific pieces of data from your experiment that supports your argument)
8. 8. If you could repeat the experiment and make it better, what would you do differently and why?
There are always ways that experiments can be improved. Now that you are a veteran of this experiment and have experience with the procedure, offer some advice to the next scientist about what you suggest and why.
Answer:
During the days four through six the population of the dark red beans changed. The change was negative meaning that there was less dark red beans that light red beans. This happened because it was harder to see the light red beans because the color of the air changed. In result of that the zocco ate mostly dark red beans.
Explanation:
please help need answer.
Answer:
Non-use of drugs:
1. A teen is with family and friends.
2. A teen is a healthy student and athlete
3. A teen is focused and living life free and happy.
Use of drugs:
1. A teen doesn't socialize and doesn't around too many people due to social anxiety caused by the use of drugs.
2. A teen has health problems in his liver and kidney due to the abuse of drugs and is not able to play any sports due to this permanent health condition.
3. A teen is in jail due to being caught in possession of drugs and failing a drug test and being unhappy with anxiety and addiction.
what energy carrying molecule is created when the chemical bonds of glucose are broken
By oxidizing glucose and other dietary molecules in a step-by-step manner, ATP and NADH are produced as chemical energy.
What is ATP?
A vital "energy molecule" present in all living things is adenosine 5′-triphosphate, also known as ATP and typically written without the 5′-. In particular, it is a coenzyme that transfers energy to cells by releasing its phosphate groups when it interacts with enzymes like ATP triphosphatase.
By adding a phosphate group to another molecule, ATP can drive biological operations (a process called phosphorylation). Special enzymes are responsible for carrying out this transfer, which connects the cellular processes that need energy to the release of energy from ATP.
A variety of cellular functions, such as ion transport, muscular contraction, the transmission of nerve impulses, substrate phosphorylation, and chemical synthesis, all require energy and hence use ATP. A large demand for ATP is generated not just by these processes but also by others.
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can someone pls help ill mark u the brainlest and no LINKS!!
Answer:
yeah ill help
Explanation:
Why is Sodium stored in oil?
in the odorant cells of mammals, specific odorants are detected by binding to ________.
Answer:
protein-coupled receptors.
true or false? local biogeochemical cycles are isolated within their particular ecosystem and all ions and molecules remain in that ecosystem permanently.
pls answer these 2 questions
Answer:
A1, they use one minute for each experiment to give them time collect and record the data so it may be saved, thus being their dependent variable
A2 "As the distance between the light and water plant increases, the number of gas bubbles decreases.
Explanation:
I pretty much put in the awnser
Write the names of the eight planets in our solar system in order starting with the planet who’s orbit is the most elliptical the planet who’s orbit is most round?
Answer:
Mercury, Mars, Saturn, Jupiter, Uranus, earth, Neptune, Venus
Explanation:
planets with orbits from most elliptical to least elliptical.
The suncoast tree of northwest Africa is known for 2 traits that are said to show simple dominance. The 2 traits are height and bark color. In height, tall is dominant to short, and in bark color blue is dominant to purple. What would the genotypes be of a suncoast tree that is pure bred purple and tall and a suncoast tree that is heterozygous for both traits?
A. bbTT X BbTt
B. BBtt X BBTT
C. bbtt X bbtt
D. BbTt X BbTt
The genotypes would be bbTT X BbTt
Assuming that bark color is represented by B (b) allele and height is represented by T (t) allele.
Since the traits show simple dominance: blue (B) of dominant over purple (b) and tall (T) is dominant over short (t)
The genotype of a tree that is purebred purple (bb) and tall (TT) would be bbTTThe genotype of a tree that is heterozygous for both trait would be BbTtThus, the cross would be bbTT x BbTtMore on genotypes can be found here: https://brainly.com/question/20730322?referrer=searchResults
Which nucleic acid carries genetic information from the cell nucleus to the
ribosomes?
*
DNA
messenger RNA
transfer RNA
the kidneys filter blood
Drag each label to the correct location on the image.
The image below shows the process of DNA replication. Identify the components of the process.
Answer:
Edmentum
Explanation:
Got it right
QUESTION 1 What technique allows you to cut hair very close to the scalp and create a flat top or square shape
Answer:
Buzz cut= razor
technique= going up with the razor to slightly create a certain look
Explanation:
Cross a heterozygous black rabbit with a heterozygous black rabbit. What is the
Genotype Percentages? What is the Phenotype Percentages? (How many will be
black, How many white? Percentages of BB Bb & bb)
Explanation:
Bb x Bb
1BB, 2Bb, and 1 bb
Let B=black fur allele(dominant) and b=white fur allele(recessive),
¾ of the rabbit will be black while ¼ will be white.
Hence,
¾×100%=75%
¼×100%=25%
The current human population growth rate is 1.12% per year. At this rate, how many years will it take for our population to double in size?
Answer:
62.5
Explanation:
The solution for doubling time is 70/(current % growth rate)
15. The
results when pollutants trap radiant energy from the sun
resulting in a warming trend in the atmosphere.
A. greenhouse effect
B. acid rain
C. radioactivity
D. extinction
Answer:
A. greenhouse effect
Explanation:
The greenhouse effect is a process that occurs when gases in Earth's atmosphere trap the Sun's heat. This process makes Earth much warmer than it would be without an atmosphere. Climate change results from the shedding of gases like CO2 into the atmosphere where it can trap more heat.
in which part of cell are calcium ions usually found?
Answer:
The endoplasmic reticulum
Explanation:
becuase im smart
what do most spaniards and cubans eat when the clock strikes midnight
Answer:
12 grapes
Explanation: When the clock strikes midnight, people across various Spanish-speaking countries like Cuba and Spain make sure to eat 12 grapes -- one for good luck in each month of the new year.