The statement ''If this macconkey agar plate was inoculated with well water, you would report the presence of coliforms in the water.'' is true because if a MacConkey agar plate inoculated with well water shows the presence of red/pink colonies, it indicates the presence of coliforms in the water,
MacConkey agar is a selective and differential medium commonly used in microbiology to isolate and differentiate Gram-negative bacteria, particularly members of the Enterobacteriaceae family, including coliforms.
Coliforms are a group of bacteria that are commonly found in the intestines of warm-blooded animals and are used as indicators of fecal contamination in water.
MacConkey agar contains lactose as a carbohydrate source, which coliforms can ferment to produce acid. The agar also contains bile salts and crystal violet, which inhibit the growth of Gram-positive bacteria.
Furthermore, the pH indicator in the agar turns red when acid is produced during lactose fermentation, allowing for the differentiation of lactose-fermenting (coliform) bacteria from non-fermenters.
Therefore, if a MacConkey agar plate inoculated with well water shows the presence of red/pink colonies, it indicates the presence of coliforms in the water, suggesting potential fecal contamination.
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What is a simple diffusion?
Answer:
movement of a solute from an area of high concentration to an area of low concentration
Explanation:
You do a serial dilution in the same manner as the one in the video. A plate with a sample volume of 10-6 mL produced 43 colonies. What was the original cell density (CFU)?
Answer: 43 x 10^6 CFU.
Explanation:
Plate count is a method used to determine the number of viable microorganisms in a sample. When the bacterial concentration is high, serial dilutions are carried out in a 1:10 sequence. Then, the dilutions are successive dilutions keeping the dilution factor constant at each step. Small aliquots of these dilutions are seeded in medium contained in a Petri dish where the bacteria grow forming colonies. Then the plates are incubated and colonies develop both within the agar and on the surface.
If the concentration of the seeded aliquot is too high, the bacteria will grow too much and it will not be possible to distinguish the colonies. However, if the concentration is very low, the number of colony forming units (CFU) may be very low and thus can be counted.
Colony forming units are calculated:
CFU = Number of colonies / (volume seeded on the plate * dilution).
The dilution is 10^-6, the number of colonies counted is 43, and usually the volume plated is 0.1 mL, so we replace that in the equation:
CFU= 43 / (0.1 mL * 10^-6)
CFU= 43000000 = 43 x 10^6
process of gathering information about events or processes in an orderly way
Answer:
Observation is the process of gathering information about events or processes in an orderly way
Are physical characteristics of an organism not genetically passed down?
PHET skate park . Consider this equation: Kinetic Energy = ½ mv2. Which of those variables is changing as the skater moves up and down the track?
Velocity is the variable which is changing during motion of skater.
Impact of velocity on energyVelocity is the variable which is changing when the skater moves up and down the track because moving upward on the slope decrease the speed of the skater while on the other hand, velocity increases when moving downward on the slope.
Mass of the body which is skating remain constant or can't change with height. Mass is the amount of matter present inside the body so we can conclude that velocity is the variable which is changing during motion of skater.
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A mouse are 380 calories worth of cherries. A fox catches it . How many calories does the fox obtain?
Answer:
The correct answer would be - 38 calories.
Explanation:
____is a restriction to the flow of electrons
Answer:
Impedance.
Explanation:
Conductors allows the flow of electrons and Impedance restricts it.
Which configuration and conditions helped the perfume molecules diffuse better?
Answer:
Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion
Explanation:
As the density of a solvent increases, the rate of diffusion decreases. yep i know
In a food chain that includes, in order, plants, markhors, and snow leopards, what roles do markhors play? (Select all that apply.)
Answer:
-They are eaten by snow leopards
-They eat plants
Explanation:
how can we control bacterial disease?
Answer:
Bacterial diseases are treated with antibiotics. Antibiotics work by killing the harmful bacteria or by stopping them from reproducing and spreading. Different types of antibiotics are effective for treating specific types of bacteria.
Explanation:
Answer:
by using antibiotics, antibiotics are harvested from fungi because they have a gene that kills the bacteria, i think it only works on bacterial infections, most of the antibiota said are used on animals and live stock.
Explanation:
Can someone please help me please
Answer:
I think so answer is D
Explanation:
I hope it helps you
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If one DNA strand reads CCGTAATGCAT, what will be the sequence of the complimentary strand?
PLEASE HELP!!!!! I NEED PERSON GOOD WITH AP BIOLOGY!! I WILL GIVE BRAINLIEST PLS!!!
Answer:
if crossing over does not occur, the products are parental gametes. If crossing over occurs, the products are recombinant gametes. Meaning they are mixed.
Explanation:
If crossing over doesn't occurs then you wouldn't really mix the 2 parental alleles so you couldn't have a genotype without mixing.
Sorry if im wrong!
Which of the following is a macronutrient?
A) iron B) boron C) Calcium D) Manganese
Mitosis and budding are similar beu
O
Both processes are components of sexual reproduction
The offspring produced by both are genetically diverse
In both, the genetic material comes from a single parent.
O O
Both processes are more common in animals than in plants.
Answer:
animals would be your awnser you are welcome
Explanation:
How do our social groups and social interactions impact our behavior?
Answer:
it makes us addict to fame and people would do anything to be higher up in the social groups
In which soil horizon do we find organic material?
Answer:
We can find organic material in
Top soilHope it will help :)
7. A man sitting outside a restaurant on a park bench is smoking a cigarette while reading a newspaper. Which answer best describes the mutagen to which the man is exposed?
O The newspaper
The cigarette
The oxygen he is breathing
The park bench
harles Darwin had a hobby of ______________ domestic pigeons.
Answer:
breeding
Explanation:
please give brainlest need 2
How would the presence of cilia, flagella, and pseudopods improve the chances of survival of a unicellular protist?
A.
by increasing the likelihood of obtaining nutrients
B.
by increasing the rate of water exchange
C.
by decreasing the rate of cell division
D.
by decreasing the energy needs of the organism
Answer:
i really dont know but I need the answer too :(
Explanation:
The presence of cilia, flagella and pseudopods improve the chances of survival of a protist by increasing the likelihood of obtaining nutrients. Thus, the correct option is A.
What is locomotion?
Locomotion is the basic act or ability of something to transport or move itself from one place to another. Many protist species have the presence of some type of locomotory organelles on their body which are easily visible under a light microscope. A protists can move by gliding or floating, and by use of organelles such as flagella or cilia.
Protists use these locomotory organelles to find food, a mate, a suitable habitat or to survive and escape form the predators. Types of Movements involved in locomotion include axial and appendicular.
Therefore, the correct option is A.
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Which of the following statements is NOT part of the cell theory? a All cells originate from other cells. b The most basic component of any organism is the cell. c All living things are made up of one or more cells. d All cells have a nucleus and a cell membrane.
Answer:
d) All cells have a nucleus and a cell membrane.
Explanation:
Prokaryotes do not have a nucleus
I need help on these questions please.
True or False
a. The sinus node generates an electrical impulse.
b. The bundle of His transfers the impulse to the AV node.
c. The fiber group stimulates only the right ventricles.
d. The cardiac cycle represents one complete heartbeat.
e. Relaxation events are referred to as diastole.
Answer:
Explanation:
A-true
B-false
C-false
D-true
E- true
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Explain the importance/need for homeostasis.
Answer:
look
Explanation:
So ur body can work properly and without it you can die (: Hope I helped im not the best at this.
Why is it important to know the average mutation rate when using DNA comparisons to determine
how long ago lineages split?
Answer:
mutation rates can be used to design molecular clocks in order to estimate divergence times among species
Explanation:
In evolutionary biology, the substitution rates (also known as mutation rates) are used for the development of 'molecular clocks' which allow estimating the divergence times among species or among taxonomic groups. Molecular clocks can be designed by estimating the divergence rate of nucleotide sequences (either DNA or RNA) and amino acid (protein) sequences. These substitution rates can also be used to track how quickly viruses evolve (for example, in a pandemic situation).
keep it cool ansd answer my question if u can! :))
design your own, you can use the Browse feature to attach and upload your document. 5. Design your own experiment based on one of your questions from question 1, above. Include the question, hypothesis, independent and dependent variables, and safety precautions. 6. What are three major branches of Earth science?
Answer:
three major branches of earth science are Geology, oceanography, meteorology.
Which gland is located closest to the human brain?
A The thyroid
B The pituitary
C The adrenal
D The ovaries
Answer:
B. The pituitary gland
Explanation:
Can't be the ovaries, they're down by the hips!
Can't be adrenal glands, they're on top of the kidneys!
Can't be the thyroid, that's low on the front of the neck or something like that!
It's B, the pituitary; it's on the base of the brain.
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PLS HELP ILL MARK BRAILIEST
Spend one minute writing an explanation of
the FUNCTION of enzymes. YOU MUST USE
THE WORDS CATALYST, ACTIVATION
ENERGY, RECYCLABLE
Answer:
Enzymes help speed up chemical reactions in the human body. They bind to molecules and alter them in specific ways. They are essential for respiration, digesting food, muscle and nerve function, among thousands of other roles.
What is the function of an enzyme? They allow chemical reactions to occur at normal body temperature fast enough to sustain life. They reduce the activation energy needed to start a chemical reaction.
There are four steps in the process of an enzyme working. (1) An enzyme and a SUBSTRATE are in the same area. The substrate is the biological molecule that the enzyme will work on. (2) The enzyme grabs onto the substrate with a special area called the ACTIVE SITE.
There are four steps in the process of an enzyme working. (1) An enzyme and a SUBSTRATE are in the same area. The substrate is the biological molecule that the enzyme will work on. (2) The enzyme grabs onto the substrate with a special area called the ACTIVE SITE.
Enzymes create chemical reactions in the body. They actually speed up the rate of a chemical reaction to help support life. The enzymes in your body help to perform very important tasks. These include building muscle, destroying toxins, and breaking down food particles during digestion.
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Answer:
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Explanation: