Answer:
b
Explanation:
The correct answer would be 6.4 x [tex]10^6[/tex] cells/ul.
For 1 x 10-6 dilution, the plating factor is [tex]10^6[/tex]. To find the number of bacteria in the original sample, the plating factor is multiplied by the colony count per ul.
Number of viable bacteria = plating factor x colony count/ul
Since 10 ul gives 64 colonies. 1 ul will give:
64/10 = 6.4 colonies.
Therefore, the viable bacteria in the original sample = 6.4 x [tex]10^6[/tex] cells/ul
The correct option is b.
How does heat affect enzymes?
Answer:
Temperature
Explanation:
Raising temperature generally speeds up a reaction, and lowering temperature slows down a reaction. However, extreme high temperatures can cause an enzyme to lose its shape (denature) and stop working. pH: Each enzyme has an optimum pH range. Extreme pH values can cause enzymes to denature.
which is a characteristic of pseudoscience
resistance to change
continually changing
involves a step-by-step method
updated by new technology
Answer:
a
Explanation:
i took the test
Please solve this lab reportJohn had a science fair project that he needed to do. He wanted to test the effects that organic and chemical fertilizers had on plant growth. John predicted that the organic fertilizer would make the plants grow taller. He used three pots, three of the same type of seed, soil, organic fertilizer, chemical fertilizer, water, and a ruler. John put soil in the pots. He added chemical fertilizer to the first pot, organic fertilizer in the second pot, and no fertilizer in the third pot. He then planted one seed in each pot. John had to water the pots daily. He also checked for growth and took measurements for a period of 10 days. He measured the height of the plants. FIll out this templatePractice Writing a Lab Report Instructions: Use the lab example given to complete the Practice Writing a Lab Report activity. Please fill in this lab report with the appropriate information and data. Title: Include your name, instructor’s name, and the name of the lab Objecti
Answer:
This question is incomplete; the complete part is: what are the independent, dependent, and controlled variables?
Independent variable: ORGANIC AND CHEMICAL FERTILIZERS
Dependent variable: HEIGHT OF PLANT
Controlled variable: Same type of seed, water
Explanation:
Independent variable is the variable that is changed or manipulated by the experimenter. In this question, John wanted to test the effects that organic and chemical fertilizers had on plant growth. Hence, the independent variable is the ORGANIC AND CHEMICAL FERTILIZERS used.
Dependent variable is the variable that responds to changes made to the independent variable. The dependent variable is the variable that is measured in an experiment. In this case, the HEIGHT OF PLANTS MEASURED is the dependent variable.
Controlled variable or Constant is the variable that is kept unchanged throughout the experiment in order not to influence the experimental result or outcome. In this case, the controlled variable is the SAME TYPE OF SEED USED, WATER.
The process by which a modified stem or root of a parent plant grows offspring that remain attached is called(1 point)
A. vegetative reproduction.
B. fragmentation.
C. binary fission.
D. tuber reproduction.
Answer:
C
Explanation:
The process by which a modified stem or root of a parent plant grows offspring that remain attached is called vegetative reproduction.
From a single fertilized ovum undergoing a series of rapid cell divisions, a human infant develops. The embryonic cells become specialized for a variety of functions. Which of these statements best describes how different cell types develop?
A. Each cell type contains only the active parts of the DNA needed for that cell type.
B. Each cell has multiple copies of DNA that are affected in different ways by the environment to change the function of the cell at regular intervals.
C. Each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells.
D. Each cell type has only one chromosome containing thr DNA needed for that cell type.
Please help ill give you 5 star and brainliest.
Answer:
Answer is C
Explanation:
Each cell has an identical copy of DNA with enzymes controlling the expression of specific genes leading to a variety of cells
The statements 'each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells' BEST describes how different cell types develop (Option C).
Epigenetics refers to any change in gene expression that does not involve a change in the nucleotide sequence.In an organism, all somatic cells are genetically identical, thereby changes in gene expression are due to epigenetic modifications.These epigenetic modifications include DNA methylation and histone modifications (e.g., histone acetylation, histone methylation, etc).Enzymes that add specific epigenetic marks such as histone acetyltransferases alter the accessibility of transcription factors to chromatin, thereby activating or repressing gene expression.In conclusion, the statements 'each cell has an identical copy of DNA with enzymes controlling the expression of specific genes, leading to a variety of cells' BEST describes how different cell types develop (Option C).
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What effect does studying with music have on student test scores hypothesis?
Answer:
It helps them to focus
Explanation:
some people focus better when listening to music
Answer:
For some students it can help and for some it cant
Explanation:
Robert Hooke discovered cells in the 18th century.
true or false
Answer:
False it is in the 17th century (1665)
Explanation:
He named the little blocks after cells (little rooms)
PLEASE HELP ME WITH THIS QUESTION
Answer:
Animal- Eukaryotic
Plant- Eukaryotic
Bacteria- Prokaryotic
Fungi- Prokaryotic
Protist- Prokaryotic
I'm not 100% happy with my answers so don't take my word on it that they will be 100% correct.
But anyway, Hope this is good.
Which carbon footprint solution does this picture try to reinforce?
a.
Recycling
c.
Using solar power
b.
Driving less
d.
Only using the washer for a full load pzzzzzz help
Answer:
Ig b
Explanation:
it usually means it's a bike only lane, but since it's not an option I would go with b
Answer:
b. Driving less
Explanation:
This photo demonstrates driving less as a carbon footprint solution because riding your bicycle not only provides a wonderful cardiovascular workout but also emits less Carbon Dioxide into the air than a car does.
What are the 3 domains and 6 kingdoms
The three domains are Archaea, Bacteria, and Eukarya, and the six kingdoms are Archaea, Bacteria, Protista, Fungi, Plantae, and Animalia.
In biological classification, the three domains are the highest level of organization for categorizing living organisms. They represent broad groups based on fundamental differences in cell structure, biochemistry, and evolutionary history.
Archaea: This domain includes prokaryotic microorganisms known as archaea. They are distinct from bacteria and eukaryotes, and often live in extreme environments like hot springs, deep-sea vents, and salt flats. Archaea have unique molecular and genetic features that distinguish them from other organisms.
Bacteria: This domain consists of prokaryotic microorganisms called bacteria. They are found in a wide range of habitats and exhibit diverse metabolic capabilities. Bacteria play important roles in various ecological processes and have both beneficial and harmful impacts on humans.
Eukarya: This domain includes all eukaryotic organisms, which are characterized by having cells with a membrane-bound nucleus and other membrane-bound organelles. Eukarya encompasses a wide variety of organisms, including protists, fungi, plants, and animals.
The six kingdoms further classify organisms within the Eukarya domain:
Archaea: This kingdom consists of archaea, which are prokaryotic microorganisms that live in extreme environments.Bacteria: This kingdom includes bacteria, which are prokaryotic microorganisms found in various habitats.Protista: This kingdom encompasses diverse eukaryotic organisms that do not fit into other kingdoms. It includes unicellular organisms like amoebas, paramecia, and algae.Fungi: This kingdom comprises multicellular eukaryotic organisms that obtain nutrients through absorption. It includes organisms like mushrooms, yeasts, and molds.Plantae: This kingdom includes multicellular eukaryotic organisms that are capable of photosynthesis. It consists of plants, including mosses, ferns, gymnosperms, and flowering plants.Animalia: This kingdom encompasses multicellular eukaryotic organisms that are heterotrophic and capable of locomotion. It includes a vast array of animals ranging from sponges to insects, fish, birds, mammals, and humans.These domains and kingdoms provide a hierarchical framework for classifying and organizing the incredible diversity of life on Earth based on shared characteristics and evolutionary relationships.
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Which of the following is a biotic factor?
Α. Starfish
B. Salt
C. Sea water
D. Sand
Answer:
It would be Α. Starfish
A man has extra digits (six fingers on each hand and six toes on each foot). His wife and their daughter have the normal number of digits (five fingers on each hand and five toes on each foot.) The couple's second child has extra digits. What is the probability that their next (third) child will have extra digits?a. 9/16.
b. 3/4.
c. 1/16.
d. 1/2.
e. 1/8.
Answer:
The correct answer is - option D. 1/2
Explanation:
Extra digits on hands and feet mean an individual has six fingers in each hand and feet, this is known as polydactyly. Polydactyly shows an autosomal dominant type of inheritance pattern.
In this case, the mother is normal so she must be recessive alleles and the first daughter is normal so the father must have a recessive allele which means he is heterozygous.
Cross:
Man = Dd
Woman = dd
Their children :
D d
d Dd dd
d Dd dd
Probability of polydactyl child = 2/4 or 1/2 or 50%
name six harmful substance in food production
Answer:
Expired food and drugs; expired food and drinks that has stayed beyond the appropriate time
Impure water; impure water is dirty water that is not fit for the body system
Unripe fruits; fruits that is not yet due for...
Infested food
Poorly cooked food
Cigarette
Explanation:
Suppose we stock a pond with 100 fish and note that the population doubles in the first year (with no harvesting), but after a number of years, the population stabilizes at what we think must be the carrying capacity of the pond: 2,000 fish. Growth seems to have followed a logistic curve. a. What population size should be maintained to achieve maximum yield, and what would be the maximum sustainable fish yield? b. If the population is maintained at 1,500 fish, what would be the sustainable yield?
Answer:
Explanation:
From the given information,
The first process is to determine the initial growth rate by using the formula:
[tex]R_o = \dfrac{In(2)}{t_d}[/tex]
where;
The initial growth rate(constant) = [tex]R_o[/tex] ; &
the doubling time = [tex]t_d[/tex] = 1 year
[tex]R_o = \dfrac{In(2)}{1 \ year}[/tex]
[tex]R_o[/tex] = 0.693 / year
Now, we move up to the net stage to find the growth constant by using the formula:
[tex]r = \dfrac{R_o}{(1 - \dfrac{N_o}{K})}[/tex]
where;
[tex]N_o[/tex] = population of fish in the pond = 100
[tex]R_o[/tex] = The initial growth rate(constant) = 0.693 /year
K = carrying capacity = 2000
Then;
[tex]r = \dfrac{0.693 \ /year }{(1 - \dfrac{100}{2000})}[/tex]
[tex]r = \dfrac{0.693 \ /year }{(1 - 0.05)}[/tex]
[tex]r = \dfrac{0.693 \ /year }{(0.95)}[/tex]
r = 0.730 / year
a)
Now, the maximum yield can be evaluated by using the expression:
[tex]= \dfrac{rk}{4}[/tex]
[tex]= \dfrac{0.730 \times 2000}{4}[/tex]
= 365 fish per year
Also, the maximum sustainable yield is said to be half of the carrying capacity suppose that the population growth obeys logistic curve;
i.e.
[tex]N' = \dfrac{1}{2} \times 2000[/tex]
N' = 1000 fish
b)
If the population is maintained at 1500 fish;
The sustainable yield can be calculated by using the formula:
The Sustainable yield = [tex]r\times N (1 - \dfrac{N}{K})[/tex]
The Sustainable yield = [tex](0.730/ year ) (1500) (1 - \dfrac{1500}{2000})[/tex]
The Sustainable yield = 1095 × 0.25
The Sustainable yield = 273.75 fish per year
The Sustainable yield ≅ 274 fish per year
Population size should be maintained to achieve maximum yield and Sustainable yield if population is maintained at 1,500 fish are 364.7 , 273.525 fish per year
Sustainable yield:Given that;
Stock in start = 100 fish
Double in 1 year
Capacity of pond = 2000 fish
Find:
Population size should be maintained to achieve maximum yield
Sustainable yield if population is maintained at 1,500 fish
Computation:
Growth rate = ln₂ / 1
Growth rate = 0.693 per year
With no growth constraint r = [tex]\frac{0.693}{1-\frac{100}{2000} }[/tex]
With no growth constraint r = 0.7294 per year
A. Population size should be maintained to achieve maximum yield = [tex]\frac{0.7294 \times 2000}{4}[/tex]
Population size should be maintained to achieve maximum yield = 364.7 fish per year
B. Sustainable yield if population is maintained at 1,500 fish = [tex][(0.7294))(1500)][1-\frac{1500}{2000} ][/tex]
Sustainable yield if population is maintained at 1,500 fish = 273.525 fish per year
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Which helps in the production of eggs?
testosterone
estrogen
semen
fallopian tube
Answer:
Semen helps in the production of eggs!
answer:
... semen...
explanation:
i'd be embarrassed to explain that bit
CAN SOMEONE HELP!!!!!
Answer:
B and i think D
Explanation:
For a single-gene trait with alleles A and a, a certain mating produces offspring that are 1/4 AA : 1/2 Aa : 1/4 aa. What is the mating?
Answer:
Random mating
Explanation:
Random mating is a type of mating that allows individual to have equal chance of been mated to.
AA genotye is mated with aa from a population and they produce
Four individuals with Aa
AA × aa
!
F1: Aa Aa Aa Aa
This individuals then intermate in the next generation to produce an offspring with three difference genotype AA, Aa, aa in ratio 1:2:1 this is called segregation of genes. This allow to see the variation and hidden features of the individual mated.
Aa × Aa
!
AA Aa Aa aa
F2: 1/4 AA, 1/2 Aa, 1/4 aa
A marble has a mass of 11.8 g. It has a volume of 3.7 cm3. What is the density of the marbl
Answer:
11.8/3.7= 3.1891891892
Explanation:
Divide 11.8 by 3.7 and instead of putting all of the numbers, just put 3.18
Please select the word from the list that best fits the definition
Brings dry, clear weather
Answer:
conduction?
Explanation:
Answer:
anticyclone/2nd one down
Why might there be more dissolved oxygen in a lake in Vermont than in a similar sized lake in Florida in summer? (20 points)
A.) The sandy bottoms of Florida lakes absorb dissolved oxygen better than the rocks in Vermont.
B.) The cooler water in a Vermont lake would be able to hold more dissolved oxygen.
C.) Water evaporates more slowly from Vermont lakes, leaving more dissolved oxygen in them.
D.) More rain falls in Florida in summer, diluting the dissolved oxygen in the lake.
Answer:
B
Explanation:
In summer, the temperature of Vermont is lower than that in Florida. When temperature increases, the ability will decrease. So there is more dissolved oxygen in Vermont's lake.
Answer:
B.) The cooler water in a Vermont lake would be able to hold more dissolved oxygen.
Explanation:
What functions share the animal tissues and the plant tissue
Answer:
hope it's help you...............
SOMEONE PLZ HELP!!!!!!!!!!!!!!!
Answer:
A
Explanation:
Human protein X is encoded by human gene X. Gene X consists of 4 exons of 200 bp each, interspersed with introns of 1,000 bp each.
An mRNA cap will be found on ____________.
a. the primary transcript
b. the mRNA
c. at least one of the lariats
d. the poly(A) tail.
e. exon 1
f. all exons
g. some introns
Answer:
a. the primary transcript
Explanation:
The first step in RNAm maturation is the modification of the 5' end of the transcript via the addition of a structure called a cap or 7-methyl guanosine cap. The enzymes responsible for the formation of this cap are recruited to the phosphorylated C-terminal domain after the addition of the first twenty to thirty nucleotides of ARN. The formation of the cap is started by the addition of a GTP molecule oriented inversely to the 5' end nucleotide on RNA. Then methyl groups are added to this G residue and to the ribose forms of one or two nucleotides located on the 5' end. All these reactions take place in the nucleus when the mRNA is found as a primary transcript.
Is cellulose a monosaccharide, disaccharide, or polysaccharide.
Answer:
Monosaccharide.
Explanation:
The major component in the rigid cell walls in plants is cellulose and is a linear polysaccharide polymer with many glucose monosaccharide units. This is the storage form of glucose in animals and humans which is analogous to the starch in plants.
Answer:
It is a polysaccharide
Explanation:
Please mark me as Branliest!!
SOMEONE PLZ HELP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Answer:
Explanation:
the nucleus , it contain chromatin reticulum which later forms the DNA
Natural _______is a mechanism for the evolution of a population to become better adapted for survival in a specific environment.
Answer:
natural selection
Explanation:
Which statement is evidence that the components of the genetic code are common to all organisms?
A. All animals have the same four nitrogenous bases in common with each other.
B. All eukaryotes have the same four nitrogenous bases in common with each other.
C. All living organisms have the same four nitrogenous bases in common with each other.
D. All prokaryotes have the same four nitrogenous bases in common with each other.
Answer:
C. All living organisms have the same four nitrogenous bases in common with each other.
Explanation:
Because all living organisms have the same 4 nitrogenous bases in common with each other but different sequences.
Brainly! For the first one to answer! Answer in one paragraph.
Do you solar cells, wind farms, tidal power, hydropower and thermal energy will solve our future energy needs?
Yes, according to my point of view I strongly believes that solar cells, wind farms, tidal power, hydropower and thermal energy will solve future energy needs.
Which source of energy is common now a days?The most common energy now a days is coal and by burning fossils fuels, we are risking climate change as well as limiting our resources. Supplies won’t last forever especially at the rate we are going. By using sun, wind, and water as sources of energy, we have renewable energy which would not run out anytime as soon as we required. Those energy charges are low cost and solves pollution issues too.
Heat energy has been transferred from one place to another by three main processes and in convection, heat energy has been carried by the movement of particles of matter. In conduction, heat is transferred by particles vibrating. In radiation, heat is carried directly by electromagnetic waves.
Therefore, Yes, according to my point of view I strongly believes that solar cells, wind farms, tidal power, hydropower and thermal energy will solve future energy needs.
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Please select the word from the list that best fits the definition
process in which liquid turns to vapor
Answer:
i think its vapporization
Answer:
evaporation
Explanation:
its the process in which water gets heated up to a point where it turns into steam or vapor
This illustration shows a kind of animal that is a free-living organism.
What is the common name of the group that contains this organism?
flatworms
tapeworms
cnidarians
annelids
Answer:
Gotta picture? That would help... Cause it says there's an illustration or something... But either way I just looked it up and found an illustration and the illustration showed a wormy lookin' thing and that wormy lookin' thing look like a flat worm. So I'ma say A. Flat worm. Tall me if I'm wrong! Thanks!
Answer:
Answer. This illustration shows a kind of animal that is a free-living organism. Phylum ( Platyhelminthes ) term is the common name of this organism. The phylum is either free-living or parasitic
Explanation: