Answers
Answer:
I think C
Explanation:
Not 100% sure
Related Questions
Atoms of carbon-14 are radioactive. They decay into atoms of the element nitrogen. Suppose that a sample of rock is taken from a fossil. The sample has 1000 atoms of carbon-14 and 1000 atoms of nitrogen.
If carbon-14 has a half-life of 57-- years, how old is the fossil?
A. 11,400 years old
B. 5700 years old
C. 2850 years old
D. 17,100 years old.
Answers
The half life of carbon -14 is 5730 years. The carbon -14 undergoes decays to form nitrogen -14. 1000 atoms of nitrogen is formed from 1000 atoms of carbon. Hence carbon -14 decayed from 2000 atoms to 1000. Therefore it is decayed by one half life and the age of the sample is about 5700 years or more accurately 5730 years.
What is radioactive decay?Unstable radioactive isotopes of atoms undergo spontaneous nuclear decay by the emission of charged particles such as alpha or beta. The time required to decay half of the initial amount of the isotope is called half life.
Carbon -14 undergo beta decay and the nuclear reaction is given as follows:
[tex]\rm _{6} ^{14}C \rightarrow _{7}^{14}N + _{-1}^{0}e[/tex]
Thus, one carbon atom is converted one nitrogen atom. Hence, 1000 nitrogen atoms are formed from 1000 carbon atoms. The remaining number of carbon atoms in the rock sample is 1000. Thus, the initial amount was 2000.
The half life of carbon -14 is about 5700 years. Hence, it takes 5700 years to decay from 2000 to 1000 atoms. Therefore, option B is correct.
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which part of a plant helps transport water to the leaves and the flower?
Answers
Answer:
Xylem carries water from the roots to the leaves. Phloem carries minerals from the roots to the leaves. Xylem carries sugars from the flowers to the stems. Phloem carries water from the flowers to the stems.
Explanation:
The xylem tissue transports water and minerals from the roots to the leaves
Which organisms were the least numerous? Why? (In a forest environment!)
Answers
Because top consumers have less energy than producers, there is only enough food for a few top level consumers, but there is plenty of food for herbivores lower down the food chain.
What is forest ecosystem?Forest ecology is the scientific study of forest patterns, processes, flora, fauna, and ecosystems. Forest management includes forestry, silviculture, and forest management.
The existence of all species in the forest in a well-balanced and environmentally friendly manner is the function of the forest ecosystem.
Forest ecosystems are classified as boreal, temperate, or tropical rainforest ecosystems.
The transfer of energy from one trophic level to the next, up the food chain, is shaped like a pyramid, with the base being wider and the top being narrower.
Because of this inefficiency, there is only enough food for a few top-tier consumers, but plenty for herbivores lower down the food chain.
Thus, top consumers were the least numerous.
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10 POINTS AND BRAINLIEST TO FIRST CORRECT ANSWER
PLZ PLZ HELP
In what ways have members of the gray whale species been affected by efforts to protect biodiversity? Check all that apply.
They are currently endangered and almost extinct.
Their numbers have increased because of the Endangered Species Act.
Their numbers have increased mostly due to captive breeding.
They are still being hunted, and their numbers are declining.
They are an example of protecting biodiversity through the passage of laws.
Answers
(E)they are an example of protecting biodiversity through the passage of laws.
Explanation:
Grey whales are nearly 45 meters long baleen whales live in the pacific ocean. Grey whale species were on the line of extinction due to overhunting or whaling in the mid 90's but due to the protection given under Endangered Species Act, its number increased now to 25,000 and in 1994 it was removed from endangered species list. Endangered Species Act's purpose is to protect those animals and plants which are at the risk of extinction and increase their number in the wild. It is strongest law implemented to save biodiversity. So grey whale species have increased due to the Endangered Species Act which is an example of protecting biodiversity through the passage of laws.
Answer:
B and E
Explanation:
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50 POINTS!!!!!!!!! ANSWER ALL!!!!(This is a repost)
1. Fill in the complementary DNA strand using DNA base pairing rules.
2. Fill in the correct mRNA bases by transcribing the bottom DNA code
3. translate the MRNA codons and find the correct amino acid using the codon table
4. Use the MRNA sequence to find the correct anticodon for the TRNA molecule
Answers
Hope it helps
Which is NOT a function of the stem in plants?
A. Store water
B. Carry nutrients
C. Provide support to the plant
D. Anchor the plant in the ground
Answers
Answer:
D.
as roots help plants to be stable in ground
students are modeling mRNA during the process of protein synthesis. which answer choice correctly describes the model of mRNA strand being transcribed
Answers
Answer:
This question lacks options, the options are:
A. the mRNA strand is complementary to the DNA template strand; however, uracil instead of adenine is paired with thymine
B. the mRNA strand is complementary to the DNA template strand; however, uracil instead of thymine is paired with adenine
C. the mRNA strand is an exact copy of the DNA template strand; however uracil instead of adenine is paired with thymine
D. the mRNA strand is an exact copy of the DNA template strand; however, uracil instead of thymine is paired with adenine
The answer is B
Explanation:
Protein synthesis which encompasses how gene is used to synthesize proteins consists of two processes namely; transcription and translation.
- Transcription is the process whereby the sequence of a DNA template is used to synthesize a mRNA strand. The mRNA sequence is synthesized using the COMPLEMENTARY BASE PAIRING RULE, which states that Adenine base (A) will always hydrogen pair with Thymine (T) while Guanine (G) will always pair with Cytosine (C).
This means that the mRNA strand produced is complementary to the DNA template strand that was transcribed. However, Uracil base (U) replaces thymine (T) in the mRNA molecule because Thymine is not found in RNA. Hence, Uracil instead of Thymine pairs with Adenine in the mRNA.
That is;
A - U, T - A, G - C.
THIS OF THAT
1. Every fifth contour line is darkened. These lines are
called
(A) index contours
(B) elevation
contours
2
A closed loop on a topographic map indicates a
(C) pond
(D)mountain
3. A contour line forms a "v" as it crosses a river. The point
of the "V" always points
(F) downhill
(G) uphill
4. A gentle slope is indicated by contour lines that are
(H) farther apart
I) closer together
(A) 100 meters
(B) 120 meters
5. What is the elevation
change from Y to X?
500
Y
440
Contour interval: 20 m
Answers
Answer:
1) index countouts
2) mountain
3) up hills
4) 100 meters
5)
Action potentials move along axons ________. Action potentials move along axons ________. more rapidly in myelinated than in unmyelinated axons by activating the sodium-potassium pump at each point along the axonal membrane more slowly in axons of large than of small diameter by the direct action of acetylcholine on the axonal membrane by reversing the concentration gradients for sodium and potassium ions
Answers
Answer:
By reversing the concentration gradients for sodium and potassium ions.
Explanation:
Axons are long thread like nerve cells which impulses are conducted from the cells of the body to the other cells. Actions potential moves along with axons by reversing the concentration gradients. Most of the neurons in human brains are interneurons. The axons are presents in these nerve cells which connect with axon hillocks.
Which of the following is not a method by which antibiotics attempt to kill bacteria?
A Crippling the cell wall
B Forming a membrane around the cell
C Interfering with protein formation
D Block RNA and DNA synthesis
Answers
Answer:
(D) Block RNA and DNA synthesis.
Explanation:
Antibiotics conquer foreign bodies and germs through the process of Phagocytosis, nicknamed cell eating. this basically a process involving the surrounding of the invading cell and pentrating through the Cell wall and thus weakening the cell's overall structure.
Plz HELP!!!!BRAINLIEST FOR THE PERSON WHO ANSWERS FIRST!!!!!
A person who receives the blood is referred as?
Answers
Answer:
The Person who receives the blood from the healthy person is called a donor.
Answer
Recipient
Explanation:
There u go guess there's no explanation for that
What are the two most important changes that occur with matter? Select two answers.
Answers
The figure above depicts the DNA-protein complex that is assembled at the transcriptional start site of gene X when the expression of gene X is activated in liver cells. Previous studies have shown th gene X is never expressed in nerve cells. Based on the diagram, which of the following most likely contributes to the specific expression pattern of gene X?
A.Expression of gene X produces large amounts of tRNA but undetectable amounts of mRNA.
B The general transcription factors inhibit the activation of gene X in liver cells by blocking the activator from binding to RNA polymerase II.
С The activator is a sequence-specific DNA-binding protein that is present in some tissues but not in other tissues.
D The enhancer is a unique DNA segment that is added to the nuclear DNA of some cells of an organism during the process of mitotic cell division but not other cells.
Answers
Answer:
C
Explanation:
The activator is a sequence-specific DNA-binding protein that is present in some tissues but not in other tissues. The correct option is C.
What is gene expression?Gene expression is the process through which a gene's information is used to create a functioning gene product, allowing it to produce end products like proteins or non-coding RNA and ultimately have an impact on phenotypes.
Because a particular protein can only be made when its gene is turned on, gene expression is significant.
However, there are several steps involved in translating a gene into a protein, and one of these steps—the creation of proteins—is crucial in the gene expression pathway that can be changed in cancer.
According to the diagram, the activator is a DNA-binding protein that only binds to certain sequences in select tissues.
Thus, the correct option is C.
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Your question seems incomplete, the missing image is:
Carbon ______________ are processes that add carbon to the atmosphere. Carbon ______________ are processes that absorb carbon
Answers
Answer:
Carbon sources
Carbon sequestration
Explanation:
Carbon sources are regions that produces atmospheric carbon dioxide. This carbon dioxide is naturally added to the atmosphere when organisms respire, decompose, rocks with carbonate are weathered and volcanoes erupt.
Carbon sequestration is the process of taken and storing atmospheric carbon dioxide. The method helps in reducing the amount of carbon dioxide in the atmosphere which in turn reduces global climate change.
PLEASE HELP I AM GIVING 15 POINTSSS ONLY IF YOU ARE CORRECT I WILL GIVE BRAINLIEST
Guppies living in a stream have a variety of spot patterns, some of which provide good camouflage against the stones in the streambed and others of which make them stand out against the background, allowing potential mates to see them more easily. If a predator that hunted by sight were introduced to the stream, what would be the most likely long-term consequence for the guppy population?
A) The number of guppies in the population would decline, although most of the remaining ones would be uncamouflaged.
B) The guppy population would devise a mutation that allowed the camouflaged guppies to find mates by scent or sound.
C) The guppy population would die out since none of the guppies would be able to find mates.
D) The number of camouflaged guppies in the population would increase while the number of successful matings decreased.
Answers
Answer:
The answer is D
Explanation:
Hope this helps!!
Answer:
d
Explanation:
D) The number of camouflaged guppies in the population would increase while the number of successful matings decreased.
how is making stuff with mud is science?? someone plss helpp plss
Answers
Answer:
Making stuff with mud is science because these are experiments used to establish facts and principles about mud and/or the different types of soil constituting the mud
Explanation:
Science is a discipline that studies the establishment of facts, principles and methods through experimentation and instills processes of investigations to learners. Making stuff with mud can be used to establish facts and principles e.g clay soil has smooth and fine particles and has high adhesive forces of attraction with water and hence will make longer and thinner ribbons while sand has large rough particles which make large and chubby (I couldn't think of another word) ribbons due to the weak adhesive forces between the particles and water.
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Cells cannot grow forever. Rather than just die, what do you think they do when they get too big?
Answers
Answer:
Well they grow up to a certain limit, so they divide into smaller cells. they do that because if the cell grows really big and it would be more difficult to get sufficient amounts of oxygen and nutrients in and waste products out, so the cell has to stop growing before this happens.
Explanation:
The food chain shows the number of organisms at each level of a lake community food chain. 12,000 Water Plants 1,900 Caddisfly larva 300 Bluegill 10 Bass Why are there fewer bass in this food chain?
A They have fewer offspring.
B. They have less energy available to them.
c They are stronger and use up more energy. D. They cannot get food from the soil like plants.
Answers
Answer:
They are stronger and use up more energy
Will using Whole Milk instead of using low
fat milk make a difference in making cheese? if so,
how?
Answers
Answer:
Yes there will be a slight difference in texture but ultimately it is a acceptable substitution. Just make sure to look at the recipe. It depends on how much fat and moisture that milk is contributing to the overall batter or food
What is an electromagnetic wave?
Please helppp
Answers
The answer to your question is C
In the human brain, the occipital lobe, controls vision. Which of the letters on the diagram above indicated the occipital lobe of the human brain?
A) e
B) a
C) d
D) c
Answers
Answer:
A) e
Explanation:
Answer:
option. A
E. represent the optical lobe of the human brain
hope it helps
I'll give brainiest if correct
Answers
Answer:
Peak: -20 C
Mid-Level: -9 C
Sea-Level: 12 C
Explanation:
The higher up you go, the colder it is. This is because cold air drifts above warm air.
No Problem, please mark me as Brainliest if you will.
Answer:
i can be completely wrong but i think -9C would go at the top -20C would go in the middle and 12C at the bottom then again where im from we dont really do C so i can be completely wrong sorry if i am
The relationship between the remora and the shark is an example of
Answers
Answer:
Additional Information: Mutualism is the relationship where both organisms get positive results from it. An example of mutualism is the relationship between remora and shark.When one organism lives on another organism, that type of symbiotic relationship is called parasitism.
The scientific name for an organism includes which taxa?
A. class and family
B. domain and kingdom
C. genus and species
D. kingdom and phylum
Answers
Answer:
C
Explanation:
Scientists name animals and plants using the system that describes the genus and species of the organism.
List one-way mitosis and meiosis are the same and one way they are different.
please help!
Answers
Answer: Mitosis and meiosis are alike in that they both are a kind of cell division. They are different in that mitosis produces two cells identical to the original, while meiosis produces cells that only have half the chromosomes of the original. Meiosis ends up with haploid cells, while mitosis endup with diploid cells.
Explanation:
Select the correctly described examples of host defense mechanisms. Check All That Apply Innate anatomical and physiological barriersInnate anatomical and physiological barriers Innate cellular and chemical defensesInnate cellular and chemical defenses Innate host defenses due to B and T cells and their productsInnate host defenses due to B and T cells and their products Use of drugs and antibioticsUse of drugs and antibiotics Specific recognition of invaders by physical barriersSpecific recognition of invaders by physical barriers
Answers
Answers: examples of host defence mechanism include: Innate anatomical and physiological barriers, Innate cellular and chemical defenses.
Explanation:
The capability of the human body to resist almost all types of organisms or toxins that tend to damage the tissues and organs is known as IMMUNITY. This host defence mechanism can be classified into INNATE or adaptive immunity.
The immunity that results from general processes, rather than from processes directed at specific disease organisms is called the INNATE IMMUNITY. The anatomical and physiological barriers of the innate immunity provides the first line of defence against pathogens. Examples of these barriers of the innate immunity includes:
--> Destruction of swallowed organisms by the low stomach pH and digestive enzymes
--> The vigorous mucociliary clearance mechanisms of the respiratory airways and lungs.
--> Resistance of the skin to invasion by organisms
While examples of innate cellular and chemical defenses include:
--> Phagocytosis of bacteria and other invaders by white blood cells and cells of the tissue macrophage System
--> lysozymes, a mucolytic polysaccharide that attacks bacteria and cause them to dissolute.
--> basic polypeptides which react and inactivate certain types of gram- positive bacteria
-->natural killer lymphocytes that can recognize and destroy foreign and tumor cells.
Does drought have to do with geologic in nature?
Answers
Albinism results from mutations in an individual's DNA. Explain how that ultimately results in an non-functional protein. Use all of the terms from your flowchart above in your explanation. Also include locations and any enzymes involved. **TERMS USED: "transcription, translation, amino acid(s), protein, gene, mRNA, tRNA, trait "
Answers
Answer:
Please find the explanation below
Explanation:
Albinism which is a condition characterized by the lack of skin pigment is caused by a mutation in the nucleotide sequence that encodes the melanin protein. However, this mutated gene undergoes TRANSCRIPTION into a mutated mRNA sequence, and subsequently undergoes TRANSLATION into a mutated amino acid sequence.
The amino acid sequence results in a non-functional protein as the nucleotide sequence of the original DNA has been altered. This non-functionality of the mutated protein results in ALBINISM TRAIT.
Q. What are the different ways in which glucose is oxidised to provide energy in the various organism ?
Q. How is oxygen and carbon dioxide transported in human beings ?
Answers
Answer:
Hey mate......
Explanation:
This is ur answer.....
1A) There are 2 ways:-
• Anaerobic Respiration.
The anaerobic respiration process takes place in the absence of oxygen.
• Aerobic Respiration.
In aerobic respiration, breakdown of pyruvate takes place in the presence of oxygen to give rise to 3 molecules of carbon dioxide and water.
2A) Oxygen is transported from lungs to body cells in the form of oxyhemoglobin . the main 2 gases exchanged are 02 & C02 . 02 is absorbed by blood capillaries from lungs alveoli by diffusion while C02 is absorbed by blood alveoli from blood capillaries by diffusion.
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Water enters the _____________ of the leaves?