First we need to determine the average atomic mass of these isotopes.
The atomic masses of Lithium-6 and Lithium-7 are 6.0151amu and 7.0160amu respectively.
Now that we have that, we need to set up the relative abundance problem.
We can do that using the formula (M1)(x) + (M2)(1-x) = M(E)
Because you asked for details, I'll explain what each variable stands for-
M1 = the mass of one isotope
x = the relative abundance
M2 = the mass of the second isotope
M(E) = the atomic mass of the element from the periodic table
Therefor all we do now is plug in our respective variable.
M1 = 6.0151amu (Lithium-6)
x = unknown relative abundance
M2 = 7.0160amu (Lithium-7)
M(E) = 6.94004amu
Now the formula plugged in will look like this:
6.0151x + 7.0160(1-x) = 6.94004
Now doing some quick math, we can determine that x=0.07589
For the last step we need to find the percent abundance of each element, which is quite simple. We take X and multiply it by 100 to find Lithium-6, so 0.076 x 100 = 7.6%
and since then we use 1 - X, so 1 - 0.076 = 0.924
We take that and also multiply it by 100, so 0.924 x 100 = 92.4%
Conclusion:
The abundance of the Lithium-6 isotope is 7.6%, and the abundance of the Lithium-7 isotope is 92.4%.
Please ask if you have any questions and I hope this was helpful!
True or false: In a typical mammalian adult cell, the M phase takes up a large fraction of the entire cell cycle.
Answer:
True
Explanation:
Hope this helps! :D
(LO 1.6) Assume a person just drank a glucose solution and is sitting quietly.
Injecting insulin would cause compared to when there was no insulin
injected.
m
Answer:
more glucose to move into cells in muscles
Explanation:
fundamental similarity due to descent from a common ancestor is called
Answer:
fundamental similarity due to descent from a common ancestor is called homology.
pls help
When new bonds form, energy is __________.
released
disconnected
gone
stored
Answer:
When new bonds form, energy is 'released'
the sum of all chemical reactions carried out in an organism is
Answer:
the sum of all chemical reactions carried out in an organism is metabolism
GIVE BRAINLIEST :)
Answer:
Metabolism
Explanation:
Metabolism, the sum of the chemical reactions that take place within each cell of a living organism and that provide energy for vital processes and for synthesizing new organic material.
Where are materials stored in single celled organisms?
Answer: Ribosomes most of the time.
Explanation:
Donde termina el impulso nervioso y que accion origina?
Por favor necesito ayuda con esto, yo ya respondí la parte de donde termina pero donde de verdad necesito ayuda es en la acción que origina, y gracias de antemano.
Answer:
Un impulso nervioso comienza cuando una neurona recibe un estímulo químico. El impulso nervioso viaja a través de la membrana del axón como un potencial de acción eléctrico hasta el terminal de axón. El terminal de axón libera neurotransmisores que llevan el impulso nervioso a la siguiente célula
Explanation:
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how does carbon and nitrogen contribute to global warming?
Explanation:
Lower nitrogen levels in soil promote release of carbon dioxide from soils under high levels of atmospheric carbon dioxide, and could therefore contribute to furthering rising atmospheric greenhouse gases and climate change
Which statement best explains how enzymes speed up chemical reactions?
a) Enzymes change shape during chemical reactions,
b) Enzymes use light energy to speed up chemical reactions
c) Enzymes lower the activation energy of a reaction.
d) Enzymes gain heat from chemical reactions
HELP................
Answer:
Active Transport
Explanation:
Which of the following is true of gravity?
1 it is a pulling force
2 it holds objects in orbit
3 it is a bending of space
4 it can alter the path of light
5 all of the above
Answer:
5. All of the above
Explanation:
Hope this helps!
What happens to the genetic material before the cell divides
Because each chromosome is made from a single molecule of 'DNA', before a cell divides itself, it had to replicate and copy its DNA. This makes it so that after cell division, each new cell holds an exact copy of the genetic material from the original cell.
I hope this helps! :)
The graph above shows the initial rate of an enzyme-catalyzed reaction at
different substrate concentrations in the presence of a constant
concentration of the enzyme.
Connect the primary structure of the enzyme to its overall shape.
The overall shape of an enzyme changes after the attachment with the substrate.
Enzymes are proteins composed of amino acids that linked together in one or more polypeptide chains. This sequence of amino acids in the form of polypeptide chain is known as the primary structure of an enzyme.
The tertiary structure is the enzyme's overall three dimensional structure, which occurs due to interactions between the R groups of the amino acids that make up the protein and the active sites of the substrate with which the enzyme can attach so we can conclude that the overall shape of an enzyme changes after the attachment with the substrate.
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The primary structure of enzymes determinies their functions and their secondary and tertiary structures. R groups remain in the center of the molecule and stabilize the structure.
--------------------------
To answer this question, we need to remember that enzymes are proteins, and hence, they share many properties. From now on, we will refer to the enzyme as proteins or molecules.
AMINO ACIDSAmino acids are organic molecules. They are composed of a central carbon, one hydrogen atom, one carboxyl group (COOH), one amine group (NH2), and one R group.
The composition of the R group is what makes them different from each other.
PROTEINS -enzymes-Proteins are amino acid polymers linearly arranged and connected by peptidic bonds. These molecules characterize by their different structures.
The peptidic bond is the union of two amino acids by their carboxyl and amine groups.
The R group of each amino acid is involved in stabilizing the molecule through their interactions.
The amount of amino acids that compose the polypeptide and their order in the chain determines the primary structure of the protein. The primary structure of the proteins determines the tertiary one.
Protein functions also depend on the aminoacids sequences. Proteins with different functions have different sequences. And among species, proteins with similar functions have similar structures.
PROTEIN STRUCTURE
The primary structure refers to the sequence in which the amino acids are arranged in the chain.
The secondary structure is the folding that the polypeptide chain adopts thanks to the formation of hydrogen bonds.
The three-dimensional structure makes them even more stable in the environment and capable of properly accomplishing their biological role.
When proteins are composed of more than one polypeptide subunit, they arrange in a fourth structure, named quaternary structure.
The hydrophilic R-groups remain in the center of the molecule, facing the protein interior, and avoiding interaction with water.
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What is the science in which earthquakes are studied called?
A. Plate Tectonics
B. Earthquake Science
C. Wave Science
D. Seismology
Answer:
D. Seismology
hope helpful <3
Answer:
D. Seismology
Explanation:
Seismology is the scientific study of earthquakes and the propagation of elastic waves through the Earth or through other planet-like bodies.
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(compound microscope)
1. Put a table lamp in front of the?
2. Put a low-power (, e.g., x5) ________into
the microscope.
3. Rotate a low-power (e.g., x4)
______________into position.
4. Look through the eyepiece. Adjust the __________________ until you see a bright circle of light.
5. Place a slide on the _________, and fix it with the __________. The ___________ on the slide should be right above the hole of the stage.
6. Look at the microscope from the side. Turn the ______
carefully to lower the objective until it is very close to the ________.
7. Look through the eyepiece. Turn the coarse
adjustment knob to raise the objective slowly until
you can see an __________ of the specimen.
7. Turn the ________ to get a sharper image. The image is now in focus.
Choices: microscope, eyepiece, objective, coarse adjustment knob, slide, specimen,
mirror, stage, clips, fine adjustment knob, image
In this exercise it is necessary to fill the gaps with the correct given word. So, the right order of words will be:
1. microscope
2. eyepiece
3. objective
4. mirror
5. stage
6. clips
7. specimen
8. coarse adjustment knob
9. slide
10. image
11. fine adjustment knob.
So, after filling all the gaps, the text and, consequently, the final answer will be:
1. Put a table lamp in front of the microscope.
2. Put a low-power (, e.g., x5) eyepiece into the microscope.
3. Rotate a low-power (e.g., x4) objective into position.
4. Look through the eyepiece. Adjust the mirror until you see a bright circle of light.
5. Place a slide on the stage, and fix it with the clips. The specimen on the slide should be right above the hole of the stage.
6. Look at the microscope from the side. Turn the coarse adjustment knob
carefully to lower the objective until it is very close to the slide.
7. Look through the eyepiece. Turn the coarse adjustment knob to raise the objective slowly until you can see an image of the specimen.
8. Turn the fine adjustment knob to get a sharper image. The image is now in focus.
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If two organisms of different species share more similar DNA sequences with each other than with other species, we can conclude that ________.
If two organisms of different species share more similar DNA sequences with each other than with other species, we can conclude that these two species are very closely related.
Anatomy and embryology, molecular biology, biogeography, and fossils all provide evidence for large-scale evolution (macroevolution).Different species with comparable architecture may be homologous (shared by ancestry) or analogous (shared due to similar selective pressures).The similarity of life's molecules is evidence that it shared an ancestor. The connections between different species can be discovered by comparing DNA sequences.Biogeography, the study of the geographical distribution of organisms, provides information on the origin and evolution of potential species.The presence of extinct species in the past and evidence of long-term evolutionary changes are both shown by fossils.Learn more about the Evidences of evolution with the help of the given link:
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which molecule is needed for photosynthesis to occur?
Answer:
Carbon dioxide and water
Explanation:
plants prepare their food in presence of these molecules to produce sugar and oxygen which we required for survive
In an energy pyramid only about
of energy is transferred from one level to the next
get the most energy, while
consumers get
the least. This is because organisms use the energy during growth, metabolism, and cellular processes, much of the energy is lost in in the form of
Answer:
Heat
Explanation:
Energy that is not use in an ecosystem is eventually lost as heat. Energy and nutrient are passed around through the food chain, when one organism eat another organism any energy remaining in a dead organism is consumed by decomposes.
Water reacts with sodium metal to produce sodium hydroxide and hydrogen
gas, along with heat and light. What are the reactants in this chemical
reaction?
You do NOT have a pair of which of the following organs?
A. Lungs (plural)
B. Ureters (plural)
C. *Urinary bladder (singular and we have only one of these)
D. Kidneys (plural)
how did this question possibly violate any guidelines?
lets see if this question stays put this time.
Quiz let is better
Answer:
c. Urinary bladder is correct
Explanation:
Adolescent may conform with peers out of fear of
A. Becoming depressed.
B. being arrested.
C. establishing a new identity.
D. being disliked
E. Other
Complete the following sentence: Environmental science can answer questions about _____________by analyzing and observing the world and testing ideas about it. physical laws moral values philosophy and art natural phenomena
Answer:
d
Explanation:
Environmental science can answer all the questions about natural phenomena by analyzing and observing the world and testing ideas about it. Thus, the correct option is D.
What is Environmental Science?
Environmental science is an interdisciplinary academic field of science which integrates different disciplines such as physics, biology, and geography to the study of the environment as a whole, and the solution of environmental problems. Environmental science has emerged from the fields of natural history and medicine during the Enlightenment period.
Environmental science has the ability to answer all the questions about the natural phenomena by the analysis and observation of the world and by testing the ideas about it.
Therefore, the correct option is D.
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When protons are actively transported across the cristae membrane in mitochondria to set up a proton gradient between the inter-membrane space and the mitochondrial matrix, this is referred to as___________________
Answer:
Explanation:
Heres where to get your answer
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What is a strength in the figure?
(1 point)
The figure shows structures in a cell.
The figure shows the steps involved in DNA replication.
The figure shows stem cell differentiation.
The figure shows where mitosis occurs in the cell cycle.
Answer:
The figure shows where mitosis occurs in the cell cycle
Explanation:
The strength in the figure is the figure shows where mitosis occurs in the cell cycle and the figure shows stem cell differentiation. Thus, option D is correct.
What is mitosis?
A cell prepares for cell division by replicating its chromosomes, segregating them, and creating two identical nuclei during the mitotic process. The cell's contents are typically evenly divided into two daughter cells with identical genomes after mitosis.
A cell copies each chromosome during mitosis and distributes one copy to each of its two daughter cells. With regard to our example of an instruction manual, it is crucial that each person receive a duplicate of each page.
Each chromosome must be delivered to each of our cells exactly once, without any errors, or the cells may have problems carrying out the genetic instructions.
Therefore, Mitosis occurs after G2 stage in the cell cycle.The strength in the figure is the figure shows where mitosis occurs in the cell cycle and the figure shows stem cell differentiation. Thus, option D is correct.
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Which of the following is NOT a muscle of the abdominal wall?
Answer:
d. Erector spinae
Explanation: is correct
Define terrestrial animal.write any five characteristics of terrestrial animal
Answer:
- living on land or on the ground.
-rather than in water and trees or in the air
-a terrestrial life
-a terrestrial habitat
- and a terrestrial species
how does acyl coa get across the inner mitochondrial membrane?
Answer:
Explanation:
Heres where to get your answer
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Spindle fibers are composed of which type of protein?
Answer:
Hey there. The answer should be Tubulin.
Explanation:
Spindle fibres are formed from microtubules which are made up of a protein called Tubulin.
Describing Cause and Effect Select the question mark. Choose the cause that brings about the effect. option a: the chicks hide in tall grass. b: not much grass grows on the nesting grounds. c: the chicks parents bring him good. d: the gray chick hatches.
Answer:
Cause: Not much grass grows on the nesting grounds
Effect: Some Arctic tern chicks have nowhere to hide
What observations did charles darwin make about finches in the galápagos islands?
Answer:
He noticed that each finch species had a different type of beak, depending on the food available on its island. The finches that ate large nuts had strong beaks for breaking the nuts open.