Answers
i think that it is c because of the picther showes
Isotopic notation for a potassium ion which has 19 protons, 20 neutrons, and 18 electrons can be correctly denoted as ³⁹K₁₉⁺¹ or ³⁹₁₉K⁺¹. Thus, the correct option is A.
What is Isotope notation?
Isotopes can also be defined in standard notation (AZE) where, A is the mass number of the atom, Z is the atomic number, and E is the symbol of the atomic element. The mass number "A" is indicated with a superscript to the left of the chemical symbol "E" while the atomic number "Z" is indicated with a subscript.
The isotope for a potassium ion which has 19 protons (atomic number), 20 neutrons and 18 electrons. A (mass number) is the sum of number of protons and neutrons in the atom. Therefore, the correct isotopic notation is ³⁹K₁₉⁺¹ or ³⁹₁₉K⁺¹.
Therefore, the correct option is A.
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Related Questions
How did the evolution of coral reefs affect the evolution of new life-forms?
Answers
Answer:
The trio determined the environment where 6615 genera of marine species originated,based on where the fossil first appeared
They determined the environment where 6615 genera of marine species originated, based on where the fossil first appeared.
How did the evolution of corals create reefs?Proof indicates that they began as simple, solo organisms but, in opposite to alter in their backdrop, later evolved into the coral reefs we know today.
It is also learned that over the 500 million years, during which corals are known to have lived, they have shared a number of end events.
Thus, It is also learned that over the 500 million years, during which corals are known to have lived.
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Some cells contain large numbers of mitochondria while others have relatively few or none. This suggests that Some cells contain large numbers of mitochondria while others have relatively few or none. This suggests that:_________.
a) cells with large numbers of mitochondria are short-lived.
b) some cells are older than others.
c) cells with large numbers of mitochondria have a high energy demand.
d) cells with large numbers of mitochondria have a low energy demand.
e) cells with small numbers of mitochondria have a large ATP supply.
Answers
Cells with large numbers of mitochondria have a high energy demand.
Cells that have a high mitochondria content, such as skeletal muscle cells, have a high energy demand.Respiration takes place in the mitochondria of cells in order to provide the cell with energy.What is mitochondria?Mitochondria are membrane-bound cell organelles (mitochondrion, singular) that generate most of the chemical energy needed to power the cell's biochemical reactions. Chemical energy produced by the mitochondria is stored in a small molecule called adenosine triphosphate (ATP)To know more about mitochondria here
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Place the events of a fracture repair in order.
A. A hematoma will form and will form a temporary connection between the ends of the bones.
B. Fibroblasts and chondroblasts migrate from the periosteum and begin to produce fibrocartilage to connect the ends of the bones.
C. Osteoclasts resorb dead portions of the new bony area, and compact bone replaces spongy bone.
D. Osteoprogenitor cells differentiate into osteoblasts and produce spongy bone.
E. Phagocytes and osteoclasts begin to remove dead and damaged tissue.
A) A,B,E,C,D.B) A,E,B,D,C.C) E,A,B,D,C.D) A,E,D,B,C.
Answers
Answer:
The correct answer is: C) E,A,B,D,C.
Explanation:
Bone fractures occur when a trauma generated a breach in the continuity of the bone. When a bone fractures, a process called secondary healing starts.
The first step in fracture repair is the removal of dead tissues - this is done by specialized cells called phagocytes and osteoclasts, that proceed by "eating" the damaged tissues.
Next, a hematoma forms because the blood vessels surrounding the fractured bone were ruptured. This hematoma clots and forms the temporary frame for the process of healing that is happening.
Mesenchymal stem cells migrate to the area and begin to differentiate into fibroblasts and chondroblasts, which is important for the production of fibrocartilage, a tissue that will connect the ends of the broken bone.
Then, osteoprogenitor cells differentiate into osteoblasts, which are the cells that synthesize bone tissue. These osteoblasts will produce spongy bone. The newly-formed fibrocartilage tissue becomes calcified.
Finally, osteoclasts begin with a process called resorption, which consists of resorbing the dead portions of the new bony area. This resorption is coupled with osteoblasts' bone synthesis. These two processes that occur together are fundamental for bone remodeling, which will end up with the spongy bone being transformed into compact bone.
Which image shows a metal?
Answers
Answer:
i believe it is the middle one. "Gold" is a part of the metal group 11
Answer:
2nd one gold is the metal
is there a type of carbohydrate that cannot undergo cellular respiration
Answers
Answer:
i personaly dont know but carbohydrates are molecouls with sugar and if im right theres only one type of carbohydrate the other ones are lipids proteins and nuclier acids only this that cant undergo cellular respiration is lipids becouse lipids are a molecoule of fat
Explanation:
but im not sure this is just my theory
Mitochondria and Chloroplast have their own DNA.
True
False
Answers
Answer:
true
Explanation:
glycogen is a ?
Monosaccharide
Disaccharide
Polysaccharide
Answers
Answer:
Polysaccharide
Explanation:
Glycogen is a polysaccharide
need the definition of Epiconl
Answers
Which role of bacteria is the most beneficial in terms of maintaining the health of the plant populations in our ecosystems?
Bacteria aiding in digestion in the intestines of animals.
Bacteria serving as a major food source for secondary consumers.
Bacteria decomposing dead materials which returns nutrients to the soil.
Bacteria producing oxygen for the oxygenation of the earth's atmosphere.
Answers
Answer:
Yes
Explanation:
Mention any two differences between milk teeth and
permanent teeth.
Answers
Answer:
milk teeth will break as u grow up
and
permenant teeth will never break when u r young but as u grow older many people teeth will break
Explanation:
milk teeth will break as u grow up
and
permenant teeth will never break when u r young but as u grow older many people teeth will break
I attached the an image. Please mark me Brainliest.
1) What are the two main elements that make up most stars?
Answers
Answer:
Hydrogen and helium are the two most plentiful elements.
A chemical reaction is a process by which atoms or groups of atoms in substances
are
(A) dissolved in other substances.
(B) ionized by the loss of protons.
mixed together with atoms in other substances.
(D) reorganized into different substances.
Answers
Answer:
A). dissolved into other substances
Explanation:
Process of elimination-
B) loss of protons-mechanical reaction
D) reorganized into different substances-physical reaction
A chemical reaction is a process by which atoms or groups of atoms in substances are reorganized into different substances. The correct option is D.
What is a chemical reaction?A series of chemical reactions that directly convert one or more substances, known as reactants, into one or more different compounds, known as products.
Chemical elements or compounds are examples of substances. A chemical reaction rearranges the constituent atoms of the reactants to produce various products.
Combination, decomposition, single-replacement, double-replacement, and combustion are the five basic types of chemical reactions.
Analyzing the reactants and products of a specific reaction will allow you to categorize it.
A chemical reaction is the chemical transformation of one set of chemical substances into another. A chemical reaction is the process by which atoms or groups of atoms in one substance are rearranged into another.
Thus, the correct option is D.
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Which sentence has more than one independent clauses?
A.
He is the boy who helped me in my assignment.
B.
I will go there after you come home.
C.
She asked me to go out, so I did.
D.
Because he was ill, he stayed home from school.
E.
After they finished eating, I did the dishes.
Answers
Answer:
d is the answer I think.........
Food gives animals energy. Which of the following could be an animal's food? Select all that apply.
A. nectar
B. a spider
C. water
D. a twig
E. a mushroom
Answers
Answer:
a spider, water provides nutrients as well, and twigs also
The options that could be animal food are nectar, a spider, a twig, and a mushroom. Thus, all the options except for water give energy to animals.
How does an animal derive energy from food?Animals derive energy from food through the mechanism of cellular respiration. Glucose is found in the food that animals generally eat. The molecules of glucose are significantly broken down during the process of cellular respiration into an energy source called ATP.
According to the context of this question, nectar is a food that is rich in sugar and provides a source of nutrients to animals. A spider is food to some animals like insects, so insects are insectivores but many also have a taste for plants. A mushroom is a kind of food for higher animals like humans.
Therefore, the options that could be animal food are nectar, a spider, a twig, and a mushroom. Thus, all the options except for water give energy to animals.
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Which of the following would test positive in the Biuret test (for proteins), and negative in the Sudan Red test (for lipids/fats)?
a. skim milk
b. wheat bread
c. meatloaf
d. vegetable oil
Answers
Why:
Photosynthetic bacteria can make their own energy.
True
O False
Answers
false
............
.
......
Answer:
False
Explanation:
Photosynthetic bacteria cannot make their own energy, this is impossible. According to the law of conservation of energy, energy cannot be created or destroyed, so "making" energy is impossible.
Photosynthetic bacteria can, however, make their own food using the Sun's energy. So they're not creating their own energy- they are simply converting it to a more usable form.
Which characteristic describes the troposphere? contains the ozone layer has the highest air pressure spans 12–50 km above Earth is a good place for planes to fly
Answers
Answer:
Has the highest air pressure
Explanation:
The troposphere contains a lot (around 80%) of earth's atmospheric mass, which makes it very compressed and dense, thus it having the highest air pressure.
(and I also just took the quiz; good luck!!)
Earth's atmosphere is made up of many layers with different temperatures and pressure. The troposphere is the lowest layer of the atmospheric regions.
The correct answer is:
Option B. The highest air pressure.
This can be explained as:
The ozone layer is not found in the troposphere but lies in the stratosphere.The troposphere has the highest pressure because it is closer to Earth surface and all the other layers lie above it.The troposphere lies up to 0 -15 km from the Earth surface.Planes can fly above or below the troposphere layer.Therefore, the troposphere has the highest air pressure.
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Some ________ rocks are made of sand, pebbles and other sediment. *
chemical
clastic
organic
None of the choices.
Answers
Answer:
Either Organic or Non of the choices.
Explanation:
he population of Japanese sika deer in central Japan was determined each year from 2005 to 2014. The sika deer population underwent logistic growth starting at 26,000 deer in 2005 and stabilized at 58,000 deer between 2012 and 2014. Based on these data, the rmax for this population was determined to be 0.57. Central Japan contains a variety of habitats, including forests and grasslands. Sika deer benefit from the resources in grasslands more than forests; if deforestation occurred, producing more grasslands in the region, the carrying capacity for sika deer population would increase. What would the population size of sika deer be one year after the carrying capacity increased to 70,000 as a result of deforestation
Answers
Answer:
The population would grow to 63,667 deer in a year, and the growth rate would decrease the following year.
Explanation:
Sika deer population : starting at 26000 in 2005
stabilized at 58000 between 2012 and 2014
rmax = 0.57
The population size of Sika deer be one year after the carrying capacity increased to 70000 as a result of deforestation
carrying capacity (k) = 70000
population size ( N ) = 58000
max growth(rmax) = 0.57
To determine the growth
dN/dt = rmax N [ (K-N) / K ] ---------- (1)
insert the given value into the formula above
dN / dt = 0.57 * 58000 [ 12000 / 70000 ]
= 33060 [12000 / 70000 ]
= 5667
The increase in population = 5667 + 58000 = 63667
The population size of Sika deer one year after the carrying capacity increased to 70000 as a result of deforestation is; 63667 deer
Calculation of Growth RateWe are given the following about the Sika deer population;
Initial Population in 2005 = 26000Stabilized Population between 2012 and 2014 = 58000r_max for population = 0.57Now, we want to find the population size of Sika deer one year after the carrying capacity increased to 70000 as a result of deforestation
Thus;
carrying capacity; k = 70000
population size; N = 58000
max growth rate; r_max = 0.57
Formula for the growth is;
dN/dt = (r_max × N)[(K - N)/K]
Plugging in the relevant values gives;
dN/dt = 0.57 × 58000[12000/70000]
dN/dt = 5667
Thus;
Increase in population = 5667 + 58000
⇒ 63667
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A pharmaceutical company wanted to test a new drug developed to lessen the effects of the common cold. To test this drug, scientists tested 50 volunteers, each of whom was suffering the effects of a cold. Twenty five of the people were given the drug, while the other 25 were given a placebo, a sugar pill. None of the participants knew who was taking which pill. All participants received a pill at 8:00 am daily for the first three days of the study. All participants lived in the same environment, with the same climate, eating the same diet, and having the same level of activity. The severity of the cold, hence the effectiveness of the pill, was determined by the number of tissues each person used within 24 hours. At the end of a seven day period, it was concluded that those with the sugar pill had their symptoms disappear as well as those who had taken the new wonder drug. The executive committee decided to produce the drug anyway thinking that the public would do anything to relieve the symptoms of a cold. Type of Variable Description Dependent Variable that the researchers actually measurers, counts or observes. It is what the researcher thinks will change in response to the experimental treatment. Independent Variable that is intentionally changed by the researcher. Standardized or Controlled These variables are held constant between each group to help prevent these factors from influencing the dependent variable. Table Source: CA Surmacz (2004) Inquiring Minds Want to know: Introducing Freshmen to Experimental Design. In Tested studies for laboratory teaching. MA O'Donnell, Ed. Vol 25 Mini Workshops. Assoc. Biology Laboratory Education pp. 316-327.
1) State the research question the study aimed to address
2) What is the hypothesis?
3) Identify the independent variable versus the dependent variable.
4) What variables were held constant in this study?
5) What was the control group?
6) What data was collected during the study?
7) What this data qualitative or quantitative?
8) What was the study's conclusion?
Answers
Answer:
1. Research question is a question which is the aim of any experiment or research, in this case, the question addressed by the study is - Testing the effects of a newly developed drug to lessen the effects of the common cold.
2. Hypothesis is an explanation for the reason for any problem it does not need the evidence and completely based on logic.
The newly developed drug is able to lessen the symptoms of a common cold.
3. Independent variable is a variable manipulated or changed during the experiment:
Administration of drug or placebo (sugar pill)
4. Dependent variable is the response to the effect of the independent variable:
Number of tissues for each volunteer
5. Control group is available that remain constant throughout the study or used to compare the results:
Administration of sugar pill to 25 volunteers
6. Data is the result that the study generated -
At the end of the 7 days or one week period, symptoms of common cold disappear in both sets of volunteers who had taken either the drug or the placebo.
7. Data in this study is found is Qualitativedata as the drug is not administrated in doses.
8. Conclusion of the study is that the Placebo effect present as sugar pills relieve the common cold so This drug needs even more analysis.
Which foods would have the following nutrient test results? (results shown below)
a. beef, peanut butter, tuna
b. apple juice, honey, orange juice
c. candy, table sugar, cola
d. pasta, bread, crackers
Answers
Answer:
The correct answer is - option c.
Explanation:
Benedict test is used to test the presence of reducing sugar in a sample. If the benedict solution turns in red or orange color it means there is a presence of glucose as it is a reducing sugar. So, this test result shows that there no reducing sugar in the sample as it is blue.
Lugol test is the test to see if the sample has starch in it or no by turning in to blue color, in this result, it is orange in color which suggests that there is no starch available.
A Biuret solution is used to test for the availability of protein in a particular sample, purple or pink color is the representation of the presence of protein. There is no protein as per result
Sudan red test is used to test the presence of TGA, lipids, or lipoproteins in a sample by reacting with it and turn in to red color. The absence of the lipids shows no change as it is shown in this test.
Thus, the correct answer among these options is - option C.
What is a cells shape directly related to
Answers
Answer:
a cell's shape is generally related to its function
Explanation:
what is species diversity
Answers
Answer:
Species diversity is defined as the number of species and abundance of each species that live in a particular location.
Explanation:
What is true about the structure or function of the plasma membrane?
Hydrophobic molecules keep the cell from getting too much water.
The bilayer structure forms a solid boundary that separates the cell from its environment.
Large molecules often cross the plasma membrane while inside vesicles.
It is made entirely of integral proteins.
Answers
Answer:
its b
Explanation:
took the quiz lol!!!!!!!!!!!!!!!!!!!!!
What are the four elements
that all graphs must have?
Answers
Answer:
x axis, y axis,
Explanation:
Answer:
title.
data points.
Appropriate labels on each axis that include units.
A legend if more than one type of information is included.
Explanation:
Where is a meteorite found?
1) in space
2) in earth’s atmosphere
3) hitting the sun
Answers
Answer:
In space
Explanation:
Because it would be weird if it would be in earth's atmosphere, and hitting the sun is rare. Most likely to come from space
Answer:
In Space.
Explanation:
All meteorites come from inside the solar system. Most break off from an asteroid in the asteroid belt and circle the sun. But they come from Space.
Explain the stages in embryonic development
Answers
Answer:
Stage Days (approx) Events
1 1 (week 1) fertilized oocyte, zygote, pronuclei
2 2 - 3 morula cell division with reduction in cytoplasmic volume, blastocyst formation of inner and outer cell mass
3 4 - 5 loss of zona pellucida, free blastocyst
4 5 - 6 attaching blastocyst
Explanation:
I hope this helps!
What actions could your school take to help combat the evolution of "superbugs"?
Answers
Two students are testing the amount of fertilizer that would best promote the growth of strawberries in a garden. Which of the following is a controlled variable?
amount of fertilizer
growth of the strawberries
number of leaves
type of soil
Answers
A controlled variable is a variable that is kept constant or unchanged throughout an experiment. In this case, the controlled variable is: Type of soil, option (D).
What is a controlled variable?A controlled variable is a variable that is kept constant or unchanged throughout an experiment. It is also called a constant or standard variable. The purpose of a controlled variable is to eliminate the possibility that changes in the experimental results are due to changes in any other variable except the one being tested.
In an experiment, there are usually one or more independent variables, which are manipulated or changed to observe their effect on the dependent variable, which is the variable being measured. The controlled variable is kept the same to prevent it from influencing the experimental outcome. By keeping the controlled variable constant, the experimenter can be confident that any observed changes in the dependent variable are due to changes in the independent variable, not the controlled variable.
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In one paragraph, using your own words, explain the process of dehydration synthesis.
Keep in mind the following: 'de-' means 'removal' and 'hydra-' means 'water'
Answers
Answer:
Dehydration synthesis is the process of joining two molecules, or compounds, together following the removal of water. When you see the word dehydration, the first thing that may come to mind is 'losing water' or 'lacking water.'
