How long does it take for half of the carbon-14 to convert back to nitrogen? Radioactive decay will cause carbon-14 to eventually become what? Why is carbon dating only useful for formerly living organisms?
Answer:
The correct answer is -
- 5,730 Approximately
- carbon-12 isotopes
- carbon-14 decays at this steady rate
Explanation:
Half the amount of the radioisotope present at any given time will undergo spontaneous disintegration during the succeeding 5,730 years so the Carbon-14 has a half-life of 5,730 Approximately .
As Carbon-14 unstable it is considered a radioactive isotope of carbon, carbon-14 will inevitably decay back to carbon-12 isotopes.
Radiocarbon dating is a method utilized by researchers to learn the ages of organic examples. It very well may be utilized on objects as old as around 62,000 years.
Radiocarbon decays gradually in a living being, and the amount lost is ceaselessly renewed as long as the living being takes in air or food. Since carbon-14 decays at this steady rate, an estimate of the date at which an organism died can be made by estimating the measure of its residual radiocarbon.
The electrons in a bond with electrons held tightly by oxygen:
a. are completely transferred from one atom to the other.
b. are loosely held between the two atoms forming the bond.
c. give rise to positive and negative partial charges.
d. are equally attracted by both atoms forming the bond.
e. give rise to full electrical charges.
Answer:
C). Give rise to positive and negative partial charges.
Explanation:
As we know, electronegativity is characterized as the ability of an atom or molecules to attract electrons and form bonds, and Oxygen is one of the electronegative elements in the periodic table. The other electronegative elements are Fluorine and Nitrogen. Thus, the oxygen would be able to 'attract electrons towards it' and this will lead to having a partial negative -ve charge on oxygen itself and partial positive +ve charge on the other atom. Thus, option C is the correct answer.
What do
you
think will happen to the cell and the organism over time if it can't produce energy?
Answer:I think they would die from not doing anything.
True or False: In a lake, the "community" includes all of the fish, turtles, frogs, algae, lily pads, and water.
Answer:
true
Explanation:
Over the course of a yoar, areas near Earth's equator receive more direct energy from the Sun than areas near Earth's polos. Which of the following correctly describes ono result of this heating pattern?
1.The poles lose all their heat at night.
2.
Atmospheric and oceanic currents distribute heat from the tropics to the polos.
3.Sunlight overheats the oceans near the equator, making it impossible for sea life to exist there.
4.Sunlight evaporatos a massive amount of surface water near the tropios, creating flooding in this part of the world.
Answer: number 2
Explanation:
The one that correctly describes one result of this heating pattern is Atmospheric and oceanic currents distribute heat from the tropics to the poles. The correct option is 2.
What is the atmosphere?The atmosphere is the outer covering of the earth. It is a layer of gases around the earth. There are different types of atmosphere. They contain different types of temperature, pressure, and gases.
The equator of the earth is at the center of the earth. They have normal temperatures there. At the poles, there is low temperature because sunlight is less there. But with the changing climate of the earth, the warming is increasing and the sun.
Thus, the correct option is 2. Atmospheric and oceanic currents distribute heat from the tropics to the poles.
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What's a chemical reaction?
Answer:
process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction....
by the way it is not biology subject
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a process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.
Why is it Necessary for every experiment to include a control group? A: the control group represents experimental conditions and used for comparison. B: The control group represents normale conditions and always changes. C: The control group represents the experimental conditions and always changes. D: The control group represents normal conditions and is used for comparison. IF YOU HAVE SNAP CHAT AND CAN HELP ME ADD ME awesomelucygirl! I have like 6 more questions :D
The answer to the question is D as the purpose for a control group is to be a comparison to the experimental group (the group that is a part of the experiment)
Answer:
D
Explanation:
an example is a person who wants to test if a particular pill makes people run faster. He gets a control group and a test group. After observing the 2 groups he compares the control group to the test group. So control groups are used for comparison to see if the hypothesis is correct or it is just a mare assumption or coincidence
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What example is lactose and cellulose
Answer:
They can be divided into simple carbohydrates, which include monosaccharides (e.g., glucose, fructose, galactose) and disaccharides (e.g., sucrose, lactose), and complex carbohydrates, which comprise starch and nonstarch polysaccharides (e.g., starch, glycogen, cellulose)
Explanation:
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How does the size of a pure substance affect its density? ( Only claim is needed for CER)
Answer:
See the answer below
Explanation:
The size of a pure substance has no effect on its density.
The density of a pure substance which is the ratio of the mass and the volume of the substance is constant. Mathematically, the density is expressed as:
Density = [tex]\frac{mass}{volume}[/tex]
This means that for every increase in the mass of a pure substance, the volume will increase measurably and vice versa. Under normal conditions, it is practically impossible to increase the mass of a substance without increasing the volume of the substance. It is also not possible to increase the volume of a substance without increasing the mass of the substance.
Hence, the density will always remain constant irrespective of the size of the substance.
Why do skates and rays have flattened bodies, while sharks are torpedo shaped?a. Sharks are more closely related to the tube-like lampreys than are skates and rays.b. Skates and rays need enlarged pectoral fins to help them stay level in turbulent water, while sharks do not.c. Skates and rays exchange gases across their skin and thus require a high surface-area-to-volume ratio, while sharks use gills to respire.d. Sharks are streamlined for active swimming at mid-depths, while skates move about mostly on the ocean bed.
Answer:
D.Sharks are streamlined for active swimming at mid-depths, while skates move about mostly on the ocean bed.
Explanation:
Sharks are known to be active off the bottom of oceans and in mid depth which has a high salinity and the streamlined body helps it to move in this kind of saline conditions.
The Skates however don’t move much and are always at the ocean bed.
This is why Sharks are streamlined for active swimming off the bottom, while skates have flat bodies move about mostly on the ocean bed is the right choice.
What does "highly variable" mean in microbiology?
Answer:
Highly variable genes are genes that differ among different species. The variable regions are used for identification.
Explanation:
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consider australian wildfire. write the effects of the wildfire on the environment and climate. Also mention the measures to get life to normal. Write 10 sentences
You use the Gram staining procedure to stain an L-form bacterium (a bacterium that lacks a cell wall). What color will the bacterium be after the staining procedure is finished
Answer:
Pink
Explanation:
A microbiologist named Christian Gram invented the gram staining technique, which aims at using a colored substance (crystal violet in colour) called GRAM STAIN to identify bacteria cells. Using the gram staining procedure, bacteria cells are classified as either Gram-positive or Gram-negative.
Gram positive bacteria are those bacteria types that retain the crystal violet color of the gram stain due to the peptidoglycan content (high) of their cell wall. Hence, they appear PURPLE after the procedure. They don't get decolorized after the procedure.
On the other hand, Gram-negative bacteria does not retain the crystal violet color of the Gran stain (gets washed off) because they lack a peptidoglycan-containing cell wall. During the gram staining procedure, the gram-negative bacteria gets bleached using an alcohol, hence, is recolorized by another dye called SAFRANIN, which makes the gram-negative bacteria appear PINK.
The bacterium will attain pink color after staining is finished.
Gram stainA test, which checks for bacteria at the location of a suspected infection like the lungs, throat, genitals, or in the wounds of the skin.
In the sample, when the stain combines with bacteria it will either turn pink or red or stay purple.
If the bacteria remains purple, they are considered as Gram positive.
In the L-form of bacteria, as they lack cell wall, they attain pink color, that is, they attain safranin dye.
In the L-form of bacteria, as they are devoid of cell wall, the decolorization of crystal violet takes place with ethanol, and then it attains pink color of safranin.
Thus, the L-form of bacteria will attain pink color.
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A researcher wants to determine the effectiveness of an enzyme at various
temperatures. Which of the following would best help the researcher determine
how well the enzyme is working? (D.O.K 2)
Answer:
This question lacks options, but the answer is TEMPERATURE
Explanation:
In an experiment, two common variables are used: independent and dependent variable. The independent variable is the variable that is changed or manipulated by the experimenter in order to effect a response in the dependent variable.
The dependent variable, on the other hand, is the responding variable or the variable that is measured by the experimenter. Note that, It is dependent on the independent variable.
In this question, the independent variable is DIFFERENT TEMPERATURE that the enzymes were exposed to because it is what is being changed by the researcher. The dependent variable is the EFFECTIVENESS OF THE ENZYME, which is dependent on the temperature it is exposed to.
Hence, how well an enzyme works (effectiveness) is determined by the TEMPERATURE
Which statement describes the energy involved in diffusion? Diffusion requires energy in all cases. Diffusion requires energy only to move material in through the cell membrane. Diffusion does not require energy in any situation. Diffusion requires energy only to move material out through the cell membrane.
Answer:
diffusion doesnt require energy in any situation
Explanation:
diffusion always occurs down concentration gradient as it is a form of passive transport. usually energy is only used when movig against concentration gradient. give me a brainliest if i helped! ♡
Answer:
C
Explanation:
A medical company has developed a product that contains an enzyme that helps lactose intolerant individuals digest the sugar lactose, which is found in many dairy products. The medication should be stored at a temperature that has a lower rate of reaction than in the body. The company would like to know the ideal temperature at which to store this new medication. During a controlled experiment, the following data is collected: Based on the data, at which temperature would you suggest the pharmaceutical company store the medication and why? A.The medication should be stored at room temperature because the enzyme has most effectively catalyzed the reaction at this temperature. B.The medication should be stored at a cold temperature because the data shows that the enzyme action slows down at colder temperatures. C.The medication should be stored in hot water because the enzyme denatures at higher temperatures. D.The medication should be stored in warm water because the heat from the water sped up the rate of the reaction to its optimal level.
Answer:
B.The medication should be stored at a cold temperature because the data shows that the enzyme action slows down at colder temperatures.
Explanation:
The most suitable temperature to store a medication is the cold temperature because the activity of enzyme is slower at lower temperature. Higher temperature cause denaturation of enzymes while at 37 degree Celsius temperature, the enzyme activity is maximum so both high temperature and room temperature is not good for the medication whereas temperature less than 5 degree Celsius is the best to store medication.
Three redwood trees are kept at different humidity levels inside a greenhouse for 12 weeks. One tree is left outside in normal conditions. The heights of the trees are measured once a week. What is the Independent Variable: What is the Dependent Variable? What is the controlled variable?
Answer: Height
Explanation: IV diverse stickiness levels, DV height CV, same tree type(redwood), time (12 weeks) – tree left external I typical conditions is likewise viewed as a benchmark group as it encounters no mugginess change.
The various variables can be grouped as :
Independent variable; Humidity levels
Dependent variable; Heights of the trees
Controlled variable ; Green house
The independent variable is the variable that not affected by the change in other variables, it determines the outcome of an independent variable in an experiment. and from our question the independent variable is the different humidity levels inside the Greenhouse
Dependent variable is the measured variable in an experiment which is primarily dependent on the Independent variable, it can be likened to be effect/result of an experiment ; height of the trees
A controlled variable is a variable that is held constant during an experiment because it doesn't have a direct importance on the aim of the experiment, but it can affect the outcome if not controlled ; Green house
Hence the independent variable = Humidity levels, Dependent variable = height of trees and the controlled variable = green house
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Which statements describe foliated rocks? Check all that apply.
Answer:
B, C, E on Edge
Explanation:
Which phrase best defines a galaxy?
Answer:
Tightly packed group of older stars large grouping of more than two stars loose, disorganized star cluster held together by gravity large collection of stars, gas, and dust held together by gravity
Explanation:
Which atom in the water molecule is positively charged
Answer:
hydrogen atoms
Explanation:
hope that helps
Explanation:
water = H2O
H+ = Hydrogen is positively charged
Which is not a type of variable in an experiment
Answer:
Scientists try to figure out how the natural world works. In doing so, they use experiments to search for cause and effect relationships. Cause and effect relationships explain why things happen and allow you to reliably predict what will happen if you do something. In other words, scientists design an experiment so that they can observe or measure if changes to one thing cause something else to vary in a repeatable way.
Scientist are studying different jackets made for extremely cold
Which jacket traps the most heat
This answer needs to be based off of scientific research, so this one makes the most sense out of the other ones.
how and why earth material seperated into layers.
Answer:
After several million years, the Earth separated into several layers. Iron, nickel and other heavy metals mostly settled to the core; lighter elements remained in the mantle around the core. The lightest elements, such as oxygen and silicon, floated to the top and cooled, forming a solid crust. Because the Earth was not completely liquid, the layering process was uneven; pockets of heavy elements remained in the crust.
Please Help me I will give out extra points. This type of cell contains a nucleus and organelles that are surrounded by membranes. Question 2 options: prokaryotic eukaryotic unicellular bacteria
Answer:
Eukaryotic cells
Explanation:
Answer:
eukariyotic/unicellular
Explanation:bc unicellular can be eukariyotic so you can really chose between those two but unicellular has a broader definition.
An individual muscle such as the biceps brachii belongs to the ______ organ systems.
Answer:
Skeletal Organ System.
Which of the following is not true of specialized transduction?
A. It is carried out by temperate phage.
B. It is restricted to those genes on either side of an integrated prophage.
C. The phage genome retains the full complement of phage genes.
D. All of the choices are correct.
Answer:
C. The phage genome retains the full complement of phage genes.
Explanation:
Transduction refers to the mechanism where a bacteriophage (i.e., a virus capable of infecting bacteria) transfers exogenous DNA from one bacterium to another. During transduction, the bacteriophage coopts the host (bacterial) cellular machinery in order to replicate their own genetic material, for which the virus needs to integrate its own genetic material into the bacterial genome. Specialized transduction refers to the genetic mechanism where a particular set of bacterial genes (donor genes) is passed to another bacterium. This process occurs when a bacteriophage genome that is inserted into the bacterial genome (also known as prophage) excises imprecisely and then adjacent donor genes are included in the excised genetic material.
An atom of a certain element has 36 protons, 36 electrons, and a mass number of 84, At
room temperature this element is a very stable gas. How many neutrons are in this atom?
Answer:
48
Explanation:
Atomic number is equal to how much electrons there is (the number of protons is equal to the number of electrons)
To find the number of neutrons, one have to subtract the atomic number from the atomic mass.
i.e: 84-36=48
The atom of the element contains 48 neutrons.
SUBATOMIC PARTICLES:
In an atom, there are three subatomic particles namely: neutron, proton and electron. The proton is the positively charged part of the atom, the electron is the negatively charged part while the neutron is the neutral part.HOW TO CALCULATE MASS NUMBER:
The mass number of an element can be calculated by adding the number of neutrons and the protons, which is the atomic number. This means that the number of neutrons can be calculated by subtracting the number of protons from the mass number of the element. That is;No. of neutrons = mass no. - no. of protons
No. of neutrons = 84 - 36
No. of neutrons = 48
Therefore, the atom of the element contains 48 neutrons.A child with a large head, multiple fractures, and blue sclerae (whites of the eyes) is evaluated for osteogenesis imperfecta. One study involves labeling of collagen chains in tissue culture to assess their mobility by gel electrophoresis. Amino acids labeled with radioactive carbon 14 are added to the culture dishes in order to label the collagen. Which of the following amino acids would not result in labeled collagen?
a. Serine
b. Glycine
c. Aspartate
d. Glutamate
e. Hydroxyproline
Answer: e. Hydroxyproline
Explanation: Osteogenesis imperfecta is a systemic heritable disorder of connective tissue whose cardinal manifestation is bone fragility - i.e. it is characterized by brittle bones that easily fracture. Hydroxyproline employed in radioactive labeling would not result in labeled collagen because it is not incorporated per se during the synthesis of collagen.
any idea on what it is?
Answer:
Adding a catalyst
Explanation:
We know this because :
→ We can see the other options contain 'removing' and' decreasing' and when those words are mentioned, it wouldn't increase the rate of a reaction
→ A catalyst speeds a reaction without being used itself