Answer:
A
Explanation:
Mario performed an experiment to determine if photosynthesis was affected by the amount of light that a plant received. The data from his experiment are shown in the table below. Amount of light (hours) Number of plants Average volume of oxygen produced (mL) 1 4 0.50 6 4 2.0 10 4 5.0 What could he have done to increase the validity of his data? Reduce the number of plants. Remove the 1 hour group. Add a 0 hours control. Measure the oxygen in liters.
Answer:
Add a 0 hour control
Explanation:
In an experiments, a control is what serves as a guide to measure the amount of change.
An experiment is made up of independent and dependent variable
the dependent variable is the variable to be measured that is varied and in this case its the number of light while the independent variable stands alone and been depended on by dependent variable. For more precision, the varied variable should have an experimental control that will serve as a check to know if indeed the varied number of light is of significance or not. If the control is having higher average performance than the experimental variable then it shows the control is more preferably but when the performance of the variable is higher than the control then its indicates that either one or some of the variable or all are equally better than the control and can be used.
Answer:
Add a 0 hour control
Explanation:
i did the test
You were preparing the slides and accidentally spilled some broth inoculated with unknown but potentially highly pathogenic bacteria over the table. Your partner did not notice that and put the marker on that spot while labeling the slides. Then he passed marker to the other working pair of students. Everybody routinely washed their hands with regular soap by the end of the lab and left home.
How many direct and indirect transmission episodes could you expect after all?
A. 1 direct and 3 indirect transmissions
B. 1 direct and 2 indirect transmissions
C. 3 indirect transmissions
D. Unknown number of direct and indirect transmissions
Answer:
C. 3 indirect transmissions
Explanation:
In epidemiology, direct transmission is considered to occur when an individual has direct contact with a pathogen, which infects him and develops a disease. Indirect infections, on the other hand, occur when individuals come into contact with the pathogen through a transmission vehicle.
In this case, we can conclude that in the question above, there were 3 cases of indirect transmission. This is because all people who had contact with the pathogen, established that contact through the contaminated marker. In this case, the marker is a transmission vehicle.
Identical twins are produced from the same sperm and egg (which splits after the first mitotic division), whereas fraternal twins are produced from separate sperm and separate egg cells. If two parents, one with brown eyes (a dominant trait) and the other with blue eyes (the recessive trait) produce one twin boy with blue eyes, what is the probability that a fraternal twin will transmit the blue eye allele to his or her offspring
Answer:
This is 25%
Explanation:
Analysis, Since the dominant brown eyed parents produce blue eye child, this shows they are heterozygote dominant
However,this fraternal twin is not genetically identical, due to the blue eye color,(recessive) but the fact remain that they are the parents.(because he inherited the recessive allele from each of the parent)Therefore the probability is 25%.
This is because he is the only one out of the 4 kids( based on Mendelian fashion) this is 1/4,25%
Fraternal tweens are produced from different maternal and paternal gametes. The blue-eyed tween has 100% probability of transmitting the blue-eyes allele to the offspring, while the brown-eyed tween has 50% probability.
Available data:Fraternal twins are produced from separate sperm and separate egg cells.Brown eyes ⇒ Dominant traitBlue eyes ⇒ Recessive traitWe will name B to the dominant allele that codes for brown, and b to the recessive allele that codes for blue eyes.
So, the possible genotypes and phenotypes are
Gentoype Phenotype
BB Brown eyes
Bb Brown eyes
bb Blue eyes
Solving the problemThe parent with blue eyes must be only bbThe parent with brown eyes must be either BB or BbFor the twin boy to have blue eyes, he must have received two recessive alleles, one from the mother and one from the father.
So the father is heter0zyg0us for brown eyes, Bb.
Cross: Bb x bb
F1) 1/2 of the progeny is expected to be brown-eyed, Bb
1/2 of the progeny is expected to be blue-eyed, bb.
So we have two genotypes for the tweens, Bb and bb.
bbThe bb tween has blue eyes and is h0m0zyg0us recessive for the trait. So the probability that this fraternal twin will transmit the blue eye allele to his or her offspring is 100% This tween can only provide recessive alleles to his or her progeny. BbThe Bb tween has brown eyes and is heter0zyg0us for the trait. So the probability that this fraternal twin will transmit the blue eye allele to his or her offspring is 50% This tween can provide one dominant or one recessive allele to his or her progeny.So, the blue-eyed tween has 100% probability of transmitting the blue-eyes allele to the offspring. The brown-eyed tween has 50% probability of transmitting the same allele to the descendants.
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what is the function of guard cells?
Answer:
Guard cells are adapted to their function by allowing gas exchange and controlling water loss within the leaf. The size of the stomatal opening is used by the plant to control the rate of transpiration and therefore limit the levels of water loss from the leaf. This helps to stop the plant from wilting .
Explanation:
Explanation:
regulates the entry of materials needed for the process of photosynthesis. can contain chloroplast which can also make them a site of photosynthesis
Sleet forms from which type of precipitation?
snowflakes
ice crystals
rain droplets
Snow
I NEED TO KNOW ASAP
Answer:
rain droplets
Explanation:
Answer:
rain droplets
Explanation:
Why is the Calvin cycle considered a dark reaction
Answer:
because it's the part that doesn't need energy from the sun to happen. The Calvin cycle takes place within the stroma of the chloroplast.
Explanation:
Answer:
The Calvin cycle can occur in the absence of light.
The Calvin cycle requires ATP and NADPH.
Explanation: See Above
uses of gene cloning in the production of human insulin
Answer:
what's gone cloning tho?
A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative. Rh positive is a trait that shows simple dominance over Rh negative and is designated by the alleles R and r, respectively. A third gene for the MN blood group has codominant alleles M and N. If both children are of blood type M, list all of the possible parental phenotypes
Answer:type A
Explanation:
Possible parental phenotypes could be mother with blood type A Rh positive and MN or MM while the father will have blood type B Rh negative and MN or MM type.
What is blood typing in humans?Blood typing is a method to tell what type of blood group or blood an individual has. Blood typing is done so a person can safely donate hos or her blood or receive a blood transfusion from another person. It is also done to see if a person have a substance called as the Rh factor on the surface of the red blood cells.
Blood typing in humans is an example of codominance and multiple allelism. Blood group A and B are codominant and O is recessive allele. Rh negative is recessive over Rh positive blood group. A third gene for the MN blood group is codominant, in which M and N are codominant.
In the given question, both the children are of blood type M. In this case, M and N are codominant over each. Therefore, the possible parental combinations can be MN × MN or MM × MN.
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Why are plant leaves green? Select one: a. They absorb only green wavelengths of light. b. They absorb only yellow and blue wavelengths of light. c. They reflect nearly all wavelengths of light. d. They reflect green wavelengths of light. e. They reflect yellow and blue wavelengths of light.
Answer: Option D.
They reflect green wavelengths of light
Explanation:
Plant leaves are green because they have chlorophyii in their chloroplast. Chloroplast is a organelle that contain the green pigment chlorophyii. The plant contain chlorophyii a and b. The Chlorophyii absorb blue and red wavelengths and other wavelengths are reflected including green are reflected so that the leaves appear green.
Many traditional household appliances, including clothes dryers, use an
excessive amount of electricity. One solution is to replace older appliances
with modern appliances that are more energy-efficient.
Which of the following behaviors could further refine this solution?
OA. Use the energy-efficient appliances instead of more conservative
tactics.
B. Use additional conservation tactics, like sometimes hanging
clothes outside to dry.
OC. Use energy-efficient appliances and traditional appliances at the
same time.
OD. Use the energy-efficient appliances more often than you need to.
Answer:
B. Use additional conservation tactics, like sometimes hanging
clothes outside to dry.
Explanation:
Ap3x
Using extra energy-saving techniques, such as occasionally hanging clothes outside to dry them, could improve the solution of replacing outdated equipment with newer, more energy-efficient appliances. So, the correct option is B.
What are energy-saving techniques?Energy-saving technology, commonly referred to as green technology, is innovation that enhances upon or replaces current systems in order to save energy. Technology of this kind often helps operators save money while reducing the negative effects of human interference with the environment.
Instead of leaving appliances on standby, turn off the power source to conserve the maximum energy. As you leave the house or go to bed, turn off the heater, air conditioner, and other equipment. Turn off the computer and any other devices, including printers and Wi-Fi routers, at night or while we're away.
Using extra energy-saving techniques, such as occasionally hanging clothes outside to dry them, could improve the solution of replacing outdated equipment with newer, more energy-efficient appliances.
Therefore, the correct option is B.
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Which of the following is not a method of heat transfer? Conduction Insulation Radiation Convection
Answer:
insulation is the correct answer
The method that is not one of the heat transfer method is insulation.
Heat transfer can be regarded a term in thermal engineering use to describe the generation as well as the use and conversion, exchange of thermal energy that exist between physical systems. Heat transfer can be done with different mechanismsThese are: conductionconvectionRadiationConvection can be regarded as the flow of heat in fluids, these fluids could be warmed gas, water.Conduction can be regarded as the movement of heat through objects that are in physical contact, like two metalsRadiation can be regarded as the energy which appears from a source then travels through space, this do contain wave-like properties. Insulation can be regarded as setting up a barrier between two objects, usually between hot and the cold object , so that heat reduction can be achieved.Therefore, Insulation is not heat transfer mechanism, it i a way to reduce heat loss.
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A scientist is trying to determine the population size of western fence lizards (Sceloporus occidentalis) in the Sycamore Canyon Park in Riverside using the mark-recapture method. During her first sampling event, she caught and marked 50 lizards which she then released back into the population. A week later she caught a total of 45 lizards, 7 of which were marked. What is the estimated population size of the western fence lizard?
Answer:
approximately 321
Explanation:
Using the mark recapture method formula, we can estimate the population size of the western fence lizard from this.
N = (M*C)/R
Where N is the estimated pop size
M is the first capture marked
C is the total second capture
R is the marked recaptured
Thus, N = (50*45) / 7
N =2250/7 = approximately 321
The mark-recapture method is an indirect method to estimate population sizes. In this example, the estimated population size of the western fence lizard is N = 321.42 individuals.
------------------------------
There are different methods to study population density.
There are direct methods and indirect methods.
Among these last ones, we might find the Mark-Recapture technique.
The Mark-Recapture technique assumptions are
A closed population during the sampling season, with no mortality nor natality. Random distribution of individuals in the population, All the individuals have the same probability of being sampled.Marks in the individual last the whole sampling season, Marks do not affect the individuals or their behavior.The method consists of
1) Capturing a first sample of individuals belonging to the population under study, in this case, lizard's population.
2) Marking the captured individuals and releasing them again.
3) Taking a second sample where a new capture is done
4) Counting the number of individuals that are already marked. These marked individuals belong to the first sample.
5) Calculating the population size by using the Lincoln Index or any other index.
The Lincolns Index estates that to estimate the total number of individuals in this population, N, the following equation must be considered:
N = (n1 x n2) / m
1) The initial sample has n1 number of individuals
2) The second sample has n2 number of individuals
4) The number of already marked individuals is m
5) The total number of individuals in the population is N
In the exposed example,
n1 = 50 lizardsn2 = 45 lizardsm = 7 lizardsN = (n1 x n2) / m
N = ( 50 x 45 ) / 7
N = 2250 / 7
N = 321.428 ≅ 321.42 individuals
The estimated population size of the western fence lizard is N = 321.42 individuals.
------------------------
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lipids ae made of C H O, C H O N
Answer:
cho
Explanation:
Answer:
Sorry that I am late, but.... I can still give you the answer for future references( this can really help k12 users too!)
Explanation:
I provided a screenshot... hopefully this helps! Have a great day! see you next time!
Advantages of attached algae
Answer:
Algae is a non flowering plant and found in very most and wet areas.
The Importance of algae include mopping up of the Carbon dioxide present in waterbodies and producing some amount of oxygen to the water through photosynthesis and this helps in the survival of sea animals.
It also helps in pollution control and degradation of hard toxic substances.
They also serve as source of food of sea animals.
what is the importance of mastication during digestion
Mastication is the process by which food is crushed and ground by teeth. It increases the surface area of foods to allow a more efficient break down by enzymes.
freshwater biomes have
Answer:
c. A salinity of less than 1%
Explanation:
Court witnesses are asked "to tell the truth, the whole truth, and nothing but the truth." Research shows, however, that eyewitness accounts of crimes often are unreliable because even the most conscientious witnesses misremember details of what they observed. What other factors that might affect the "truth" a court witness presents?
Answer:
Check explanation
Explanation:
The testimony presented by an eyewitness is unreliable for a number of reasons, a few of which are listed below:
1. The witness may give false details about the incident out of fear or pressure.
2. The witness may misidentify a convict and ruin an innocent person's life by putting them in jail.
3. Events are not stored perfectly in one's memory, as research has shown, making eye witness accounts inaccurate.
the frequency of down syndrom increase with
the age of parents ?
Answer:
See below
Explanation:
Researchers found that the rate of Down syndrome among parents over 40 was 60 per 10,000 births, which is six times higher than the rate found among couples under 35 years old.
The sum of the Genetic traits in a population is called its
Answer and Explanation:
The gene pool is the sum of all the alleles in a population. Sometimes, allele frequencies within a population change randomly with no advantage to the population over existing allele frequencies. This phenomenon is called genetic drift.
Answer:
gene pool
Explanation:
Which of the following hormones is synthesized in hypothalmus and secreted from pitutary? Vasopressi or adrenocorticotropic hormones
Answer:
Vasopressin
It is synthesized in the hypothalamus and then secreted by the posterior lobe of pituitary gland
What is the smallest or most specific level of organization organization you and your neighbors all have in common
Answer:
The cell
Explanation:
The smallest or most specific level of organization that all living organisms (including myself and my neighbors) have in common is the cell.
This is in accordance with the cell theory which has three basic components, including:
1. The cell is the basic unit of life
2. All living organisms are made up cells
3. Cells arose from pre-exsiting cells.
Other levels of organisation include tissues which are group of cells specialized for a certain function, organs which are group of tissues serving similar function, and systems which are group of organs working together as a unit.
Answer:
Population
Explanation: got it right sis !