Which of these statements about molecules is true? A. All molecules only contain one element
B. Two or more molecules can combine to form an atom
C.the elements in a molecule are always present in equal proportions.
D. The atoms in a molecule cannot be separated from each other by physical means
Answers
Answer:
D
Explanation:
The atoms in a molecule cannot be separated from each other by the means of physical force because they are bound to each other through chemical bonds. Thus, the correct option is D.
What are molecules?Molecules are a group of two or more similar or different atoms that form the smallest identifiable unit which can be divided into pure substances such as atoms. Molecules retain the composition and chemical properties of the substance from which it is built.
Molecules can be homogenous or heterogenous depending upon the constituent atoms. If different atoms combine to form a molecule then it is heterogenous in nature e.g., CO₂ while the molecule which is made up one type of atom is known as homogenous. Example- O₃.
Molecules have chemical bonds which are responsible for the binding of atoms, these chemical bonds can be broken by applying energy in the form of heat to the molecules.
Therefore, the correct option is D.
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Related Questions
need help food class is hard
Answers
The answer is either that he is a scientist or a chemist, but I think I’d go with scientist.
Hope this helps!
define each characteristic of life
Answers
Answer:
All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing. When viewed together, these characteristics serve to define life.
5. Which type of microscope would be the best tool to use to view the surface of a bacterial cell? Why? Answer:
Answers
Answer:
Electron Microscopy. EDS Analysis.
A scanning electron microscope is the best tool for studying the details of the surface of a bacterial cell.
What is a scanning electron microscope?
A scanning microscope or SEM is a microscope in which a focused beam of high-energy electrons is used for to the generation of signals on the surface of solid specimens. These signals are derived from the interactions of electron-sample.
This reveals the information about the surface of a sample which includes external morphology or texture, chemical composition, and structure and material orientation of the sample. In most of the applications of this microscope, the data is collected for the selected area of the surface of the sample and the 2-D image for that is produced which displays spatial variations in these properties.
In a scanning mode, areas ranging from 1 cm to 5 microns are visualised using conventional techniques of SEM techniques. In this, the magnification ranges from 20X to approximately 30,000X with a spatial resolution of 50 to 100 nm.
Therefore, to study the details of the surface, a scanning electron microscope is used.
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1
Which of the following is true about the locations of earthquakes, volcanoes, and tectonic plate boundaries?
A. Earthquakes are commonly located near plate boundaries, but volcanoes are not.
B. Volcanoes are commonly located near plate boundaries, but earthquakes are not.
C. Earthquakes and volcanoes are both commonly located near plate boundaries.
D.
Neither earthquakes nor volcanoes are located near plate boundaries.
Answers
Answer:
Weird.. My answer was both of them were close. Huh.
Explanation:
Which category is the independent variable?
Answers
Answer:
Amount of Vitamin C
Explanation:
The pounds of growth is dependent of how much vitamins are given
1. How are atoms in a
compound held together?
Answers
A compound is a molecule made of atoms from different elements. All compounds are molecules, but not all molecules are compounds. ... There are two main types of chemical bonds that hold atoms together: covalent and ionic/electrovalent bonds. Atoms that share electrons in a chemical bond have covalent bonds.
atoms are held together by chemical bonds
O hipotálamo produz 2 hormônios: ocitocina, que estimula a contração do útero no parto e estimula a liberação do leite marterno; e prolactina, responsável pela produção do leite materno
Answers
Answer:
O hipotálamo produz 2 hormônios: ocitocina, que estimula a contração do útero no parto e estimula a liberação do leite marterno; e prolactina, responsável pela produção do leite materno
Explanation:
O leite materno é considerado o melhor alimento para o bebê, por isso é necessário cumprir a amamentação obrigatória nos primeiros seis meses de vida do bebê no caso de ter leite.
As mães que faltam ao leite materno é porque há uma inibição desse eixo entre o hipotálamo, o útero e as glândulas mamárias, os hormônios não são secretados, portanto o órgão alvo não os percebe através de seu receptor e não tem um produto metabólico.
Por outro lado, a ocitocina é um hormônio que promove a contração muscular do útero, gerando trabalho de parto para a expulsão do bebê pelo canal vasginal, essas contrações para iniciar o trabalho de parto devem ser a cada cinco minutos e intensidade Alto.
Does anyone know how to do independent and dependent variable for Science
Answers
D.V= liquid
I think that’s right
Answer:
independent variable: type of liquid
dependent variable: height of plants
Explanation:
The dependent variable is the value that changes in response to a change in the independent variable. The height of the plants will depend on the type of liquid that each plant is watered with. Hope this helps!
All numbers along both axes need to be evenly spaced truth or false
Answers
Answer:
37shhsjshxhxbshjdksnxjejs
What role does the nitrogen cycle play in the life cycle of a plant? ( please help me! thank you! )
Answers
Answer:
Assimilation
Explanation:
This is how plants absorb nitrates from their roots. Then the nitrogen gets used in amino acids, nucleic acids, and chlorophyll.
Scientist wanted to know how the enzymes of a new genetically modified bacteria would react to environmental factors. Which test below would be one they may run?
Answers
Answer:
Enzymes are catalyst also called biocatalyst
Explanation:
Enzymes are called the biological catalyst. These are also called biocatalyst. These enzymes speed up the biochemicals in the body of an organism. These are extracted from the cells and then catalyze at wide range. Enzymes are used to produce the sweetening agents and for the modification of the agents.
There some techniques that are used to test enzymes such as:
Gel electrophoresis
PCR
Cloning
Biotechnology
A certain toxin prevents the mitochondria from functioning properly. Describe the immediate effect this toxin would have on a cell.
Answers
Answer:
The cell can't perform its activities.
Explanation:
The immediate effect of this toxin, the cell is greatly affected because mitochondria is the powerhouse of the cell which provide energy in the form of adenine tri phosphate (ATP) by the breaking down of the glucose molecule. If mitochondria does not function properly so there is no energy for the cell and the cell can't perform its activities and our body muscles will be weaker and tired very fast.
If a certain toxin prevents the mitochondria from functioning properly, then the cell won't be able to create energy in the form of ATP. Cellular respiration occurs in the mitochondria.
Mitochondria are the energy centers of the eukaryotic cells where ATP (the energy coin of the cell) is synthesized.Cellular respiration is a series of metabolic reactions by which cells produce energy in the form of ATP from energy from foods and oxygen.This process (cellular respiration) has three stages: glycolysis, the Krebs cycle and oxidative phosphorylation.Glycolysis occurs in the cytoplasm, whereas the Krebs cycle and oxidative phosphorylation occur in the mitochondria.In conclusion, if a certain toxin prevents the mitochondria from functioning properly, then the cell won't be able to create energy in the form of ATP.
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Which spheres interact in the formation of tsunamis? Check all that apply.
Answers
geosphere and hydrosphere
Answer:
The answer is Geosphere and hydrosphere. D and E <3
Explanation:
Gerald is studying the plants and animals of a meadow. He classifies the grasses and clover as autotrophs or producers. Give two pieces of evidence to support Gerald’s classification.
Answers
Answer:
First evidence is both are plants.
Second evidence is both uses sunlight.
Explanation:
Grasses and clover are autotroph and can be classified as producer because they has the ability to produce their own food from the process of photosynthesis. Gerald’s classification is right because grasses and clover are plants and we know that plants are the producer of the ecosystem. We can also see that plant is the only organism which uses sun as a source of energy from which it produce their own food.
If a trait is influenced by genes, then it ought to be more highly correlated across pairs of ________ than across pairs of ________.
Answers
Answer:
identical twins
fraternal twins
If a trait is influenced by genes, then it ought to be more highly correlated across pairs of identical twins than across pairs of fraternal twins.
What are Twins?Twins are defined as two offspring produced from a single pregnancy, which can either be monozygotic means that they develop from a single zygote, which splits and forms two embryos, or dizygotic means that each twin develops from a separate egg and each egg is fertilized by the own sperm cell.
Identical twins are also called as monozygotic twins which results from the fertilization of a single egg by a single sperm, with the fertilized egg then splitting into two. These share the same genomes and are always of the same sex.
Fraternal twins are called dizygotic twins which result from the fertilization of two different eggs with two different sperms during a single pregnancy. They share half their genome just like any other siblings which may not be of the same sex or look alike.
Thus, if a trait is influenced by genes, then it ought to be more highly correlated across pairs of identical twins than across pairs of fraternal twins.
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What does impermeable mean ?
Answers
Explanation:
Impermeable means not allowing fluid to pass through.
I need help with answering the questions!
Answers
2. The new sauce
A solution of one part of egg albumen mixed with two parts of water in a test tube is used to test for what?
Answers
Answer:
It is a test to check the protein's solubility.
Explanation:
Proteins have varying levels of solubility and it is necessary to carry out tests that prove in which aqueous media the proteins are more likely to have high levels of solubility. This facilitates the execution of scientific works that develop products that work with proteins.
The level of solubility of proteins depends on the distribution of the polar and nonpolar groups of this molecule.
The most common test is done by adding water and protein to a beaker. An example of this is done by adding part of egg albumin mixed with two parts of water.
PLZ HELP :) The light dependent and light independent reactions of photosynthesis work together. The light-dependent reactions trap the energy from sunlight to form ATP and NADPH molecules, giving off oxygen gas. The light-independent reactions use that chemical energy and carbon dioxide to build stable long-term energy storage in the form of:
Group of answer choices
glucose
ATP
water
proteins
Answers
The answer is A. Glucose.
Short answer, I had the same question on a quiz.
Long answer, the second phase, AKA the light-INdependent or Calvin Phase, uses that ATP & NADPH from the light-dependent phase & forms glucose to provide long-term energy for the cell to use.
Hope this helps! :)
The light-independent reactions of photosynthesis use the chemical energy in the form of ATP and NADPH, produced by the light-dependent reactions, along with carbon dioxide to build stable, long-term energy storage in the form of glucose. Therefore, the correct option is (A).
What is light-independent reactions?The light-independent reactions, also known as the Calvin cycle, is the second stage of photosynthesis that takes place in the stroma of the chloroplasts in plants. It is named light-independent because it does not require light energy directly, but it does depend on the products of the light-dependent reactions, which are ATP and NADPH.
In the light-independent reactions, carbon dioxide from the atmosphere is fixed into organic molecules using the chemical energy in ATP and NADPH. The first step of the cycle is carbon fixation, where carbon dioxide is combined with a 5-carbon molecule called ribulose-1,5-bisphosphate (RuBP) to form a 6-carbon intermediate, which immediately breaks down into two 3-carbon molecules called 3-phosphoglycerate (3PG). The second step of the cycle is reduction, where ATP and NADPH are used to convert the 3PG into G3P (glyceraldehyde-3-phosphate). Some of the G3P molecules are used to regenerate RuBP, while the remaining G3P molecules can be used to make glucose, sucrose, or other organic molecules.
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Name one reason why a controlled experiment may not be possible
Answers
there could be harmful chemicals
social implications on performance enhancing drugs
Answers
Answer:
hey resa your answer here
A lizard sitting on a rock would be considered the ______level of organization.
Answers
Answer:
Organism
Explanation:
The organism level of organization is the level of organisation that comes after the organ system level of organisation. The organism level of organisation is the level at which the living system is complete and comprises of the interconnection and synergy of the lower organization levels.
At the organism or life form organizational level, all the characteristics of living things are manifested.
The basic living system, a functional grouping of the lower-level components, including at least one cell.
1. For each missing word or phrase, circle the choice that correctly completes the sentence. The three main gases that trap heat in Earth's atmosphere are (carbon dioxide / oxygen / nitrogen / hydrogen), methane, and water vapor. They contribute to the (climate / ecosystem / greenhouse / biosphere) effect, which makes Earth's temperatures warmer than they would be otherwise.
Answers
Answer:
Carbon Dioxide; Greenhouse
Explanation:
Carbon dioxide, methane, and water vapor all trap heat in the Earth's atmosphere. Because they are trapping the gasses in the atmosphere, they are contributing to the Greenhouse effect, which makes Earth's temperatures hotter/warmer. The "Greenhouse" part is saying that everything underneath the Earth's atmosphere is "housing" the heat and keeping the heat in.
Which of the following would you report to the nurse?
-Oral Temperature 98.0,pulse 68 & irregular, Respiration’s 16, B/P 102/64
-Tympanic Temperature 101.6, Pulse 104, Respiration’s 18, B/P 132/84
-Oral Temperature 99.2, Pulse 96, Respiration’s 18, B/P 106/70
-Oral Temperature 98.0, Pulse 84, Respiration’s 20, B/P 122/86
-Tympanic Temperature 99.2, Pulse 62, Respiration’s 18, B/P 180/110
-Tympanic Temperature 97.8, Pulse 52, Respiration’s 14, B/P 126/72
Answers
Answer:
the second to last one
Explanation:
BP is extremely high?? average is 120/80, also elevated temperature.
identify the part of the following plant which can be used from which can be used vegetative propagation
Answers
Answer:
poooooooooooooooooooooop
Explanation:
A biological system that includes living things and nonliving thingsIs called an?
Answers
Answer:
I guess its Ecosystem!!!!!
Which structure provides food for this cell
Answers
Answer:
The chloroplast
Explanation:
It makes sugars that feed cell's machinery
Imagine that you wish to compare two different diets that will be fed to tadpoles raised in a lab. One diet is a meat-based fish food, and the other is the traditional diet of boiled lettuce. You want to see if the meat-based diet will be associated with an increase in the average weight of the tadpoles. In your experiment you keep all other factors, such as tadpole density per pan, temperature, pH, and the amount of food the same. The only difference between your control and experimental groups is the type of food the tadpoles receive. What is the independent variable for the tadpole diet experiment?
Answers
Answer:
TYPE OF DIET
Explanation:
Independent variable of an experiment is that variable that is subject to manipulation or changing by the experimenter in order to effect a response in the dependent variable.
According to the experiment in this question, the type of diet is changed for different groups of tadpoles in order to see the effect on their average weight. Based on this, the independent/manipulated variable is the TYPE OF DIET administered to each group of tadpole while the growth (average weight) of the tadpoles is the dependent variable.
An energy company wants to build a geothermal energy plant within a wildlife preserve. Which of these is a likely benefit to building a geothermal energy plant in this area?
Increased growth in forest vegetation
Energy supplies will last indefinitely
The atmospheric temperature would increase
Nitrous oxide in the atmosphere would decrease
Answers
Answer:
I believe its D Nitrous oxide in the atmosphere would decrease
Explanation:
Energy supplies will last indefinitely if a geothermal energy plant is built within a wildlife preserve.
What is Geothermal energy?This is the type of heat which is generated within the earth crust and is also formed from radioactive decay of materials.
Geothermal energy plant will lead to energy supplies lasting indefinitely which is why option B was chosen.
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HELPPP MEEEEE!!!!!!!!!!!!!111
Answers
Answer:
Group A
Explanation:
Answer:
C. Group A
Explanation:
First, let's define accuracy and precision.
Precision: the measurements are all close to each other
Accuracy: the measurements are close to the true value.
Let's examine the answer choices.
A. Group C: 32.1 g, 35.0 g, 25.0 g
This is not accurate or precise. The measurements are far from each other and only one is close to 25 g.
B. Group D: 20.0 g, 25.0 g, 30.0 g,
The measurements are relatively accurate and precise. They are within 5.0 grams of each other and the true value.
C. Group A: 28.5 g, 28.4 g, 28.5
The measurements are the most precise. They are all within 0.1 gram of each other. They are also somewhat accurate.
D. Group B: 25.5 g, 25.0 g, 24.8 g
The measurements are not precise or accurate. There is one measurement that is far from the true value and the other measurements.
Therefore, the most precise measurements are from Group A.