Absorbance is the measure of the quantity of light intensity absorbed by a sample solution.
What is absorbance?Absorbance, denoted by A, is used to measure the amount of light intensity that is absorbed by a sample.
Absorbance is measured in a technique called spectrophotometry using a device called spectrophotometer. The spectrophotometer measures the intensity of light as photons of light passes through the sample.
The amount of that incident light that is absorbed by the sample is then displayed on the screen or output of the spectrophotometer.
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Please help this is due 9 hours
Scientists often use controlled experiments to answer questions.
Choose the three correct statements about controlled experiments.
A) No changes are made to a test group in an experiment.
B) A control group is used for comparison to other groups.
C) Only one change can be made per test group in an experiment.
D) Changes can only be made to the control group in an experiment.
E) A controlled experiment must have a control group and test group(s).
Answer:
B) A control group is used for comparison to other groups.
E) A controlled experiment must have a control group and test group(s).
C) Only one change can be made per test group in an experiment.
fill out the following about genetics:
Answer:
Define alleles:
Alleles are alternate forms of genes that are visible by mutations. They are found at a specific locus in a chromosome.
A. The genotypes of the parents: Ww and ww
B. The genotypic ratio of the offspring: 2:2
C. The phenotypic ratio of the offspring: 2:2
Explanation:
A white-fruited plant is crossed with a yellow-fruited plant. According to the instructions, the allele for white-fruited plants are dominant over the allele for yellow-fruited plants, this means that in order a plant to be white-fruited, they must either have the alleles Ww or WW. In this case, it is better to cross Ww, as all of the offsprings are yellow-fruited (ww).
Whenever we cross Ww and ww, we have a fifty percent chance of the offsprings either having the alleles "Ww" or "ww".
There are four smaller squares in a punnet square, and half of the smaller squares code for the alleles "Ww" and the other half code for the alleles "ww". This means that the genotypic ratio of the offspring would be 2:2, as 2 of the smaller squares code for "Ww", and the other 2 code for "ww".
Since "Ww" has a dominant allele, the phenotype for the organism with this genotype would be white-fruited, and for "ww", the phenotype for the organism would be yellow-fruited. This means that in this case, there would be a 50% chance for a white-fruited plant, and a 50% chance for a yellow-fruited plant. This is why the phenotypic ratio of the offspring would also be 2:2, as half of the smaller squares code for a plant with a white-fruited phenotype, and the other half of the smaller squares code for a plant with a yellow-fruited phenotype.
hello humans ~
Based on the given statements, choose the correct option.
Statement 1: Amoeba and WBCs use pseudopodia for locomotion.
Statement 2: Amoeba and WBCs are both capable of independent existence.
Statement 3: Amoeba and WBCs can change their shapes.
Statement 4: Amoeba and WBCs have cell membrane.
A. Statement 3 is incorrect.
B. Statement 1 and 2 are incorrect.
C. Statement 1, 2, 3 and 4 are incorrect.
D. Statement 4 is incorrect
Answer:
amoeba and WBCs can change their shape
Explanation:
Amoeba cells and white blood cells can change their shapes. Amoeba consists of pseudopodia also known as the false feet. White blood cells can engulf or kill pathogens by changing their shape.
Hope it helps!!!brainliest pls!!!According to the model below, how long ago did the common ancestor of all the organisms on the
phylogenetic tree exist?
Millions of Years Ago
Answer
about 3.9 billion years ago
about 3.9 billion years agoThe most recent common ancestor of all currently living organisms is the last universal ancestor, which lived about 3.9 billion years ago.
helper T cell provide activation to …….
A- the pathogen
B- B and TC cells
C- the bone marrow
D- thymus gland
[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]
Here's the Answer ~
The Helper T cell provide activation to B. [ B and TC cells ]
1.Which type of fresh water is at risk of increased salinity as earth warms?
Glaciers
mountain
streams
coastal
lakes
snowpacks
Answer: Coastal Lakes
Explanation: I took the assessment:)
The type of freshwater that is at risk of increased salinity as the earth warms is : Coastal lakes
What are coastal lakes ?Coastal lakes are water bodies which occur in Basins and are separated from larger water bodies such as oceans and seas by a narrow lands. They run parallel to the shore are mostly likely at the risk of increased salinity as the earth warms and also due to their proximity to salty waters.
Hence we conclude that The type of freshwater that is at risk of increased salinity as the earth warms is : Coastal lakes.
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What is the effect of hyperinsulinism on the metabolism of carbohydrates, amino acids, and lipids by the liver
Hyperinsulinism produces an excessive uptake of glucose by the liver (hypoglycemia). It also leads to an interruption in amino acid and fatty acid catabolism.
What is hyperinsulin?Hyperinsulin is a condition associated with the excessive production of insulin, a key hormone in glucose metabolism.
The main effect of hyperinsulinism is an excessive uptake of glucose by the liver, which is associated with hypoglycemia.
Hyperinsulin can also produce a chronic interruption in the amino acid and fatty acid metabolism (catabolism).
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PLEASE HELP!!!!!!!!! WILL GIVE 60 PTS, NOT A JOKE!!!!
Drop down menus:
In some cases of head injuries, the cerebrum may be affected. This type of injury could cause a loss of _________ and impaired __________.
1) a. breathing regulation
b. reflexive movement
c. voluntary movement
2) a. heart rate
b. involuntary movement
c. speech
In some cases of head injuries, the cerebrum may be affected. This type of injury could cause a loss of voluntary movement and impaired speech
An individual of genotype TtFFgg mates with an individual of genotype ttFfgg. About how many of their 100 offspring would you expect to be heterozygous for all three traits
Answer:
0
Explanation:
Heterozygous means that they have an allele for both traits and is in the form (Aa) meaning they have both the dominant and recessive trait.
We notice that the third trait, represented by 'g', is in the form gg for both individuals. Since they are both lowercase and the same allele, they are both hom0zygous for that trait, meaning there is no way the offspring can get a dominant trait to make their genotype Gg.
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Which of the following farming approaches can grow food crops with less land use?
a. organic farming
b. vertical farming
c. industrial farming
d. biodynamic farming
Answer:
B. vertical farming
The farming approach that can grow food crops with less land use is option b, or "vertical farming," as it is an innovative farming approach that involves growing crops in vertically stacked layers.
What is vertical farming?Vertical farming is an innovative agricultural technique that involves growing crops in vertically stacked layers using artificial lighting and a soilless medium. The plants are grown in a controlled environment where all aspects of the growth process, such as temperature, humidity, and lighting, are carefully managed to optimize plant growth and yields, and vertical farming systems can be located in urban areas or other locations where land is limited or expensive. By growing crops vertically, the amount of land needed to produce a given amount of food is greatly reduced as compared to traditional farming methods that require large amounts of horizontal land.
Hence, the farming approach that can grow food crops with less land use is option b, vertical farming.
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Which of the following precautions can help prevent mother-to-child HIV transm ensuring that an infected mother eats 10% more calories ensuring that an infected mother uses condoms starting an infected mother on antiretroviral treatment ensuring that an infected mother avoids antiretroviral treatment Question 3
A: Ensuring that an infected mother eats 10% more calories
B:Ensuring that an injected mother uses condoms
C:starting an infected mother on antiretroviral treatment
D:Ensuring that an infected mother avoids antiretroviral treatment
Answer:
C.
Explanation:
Antiretroviral treatment is the most effective way to prevent mother to child infections assuming she is already pregnant.
Wearing condoms only protects others
More calories only needs she's going to be feeding the baby more.
Avoidjng treatment only makes it worse thus making baby more susceptible to catching it.
People tint windows dark to encourage __________.
transmission
absorption
reflection
transfusion
Answer:
absorption
Explanation:
dark hues of colour are generally used to absorb heat while since they absorb heat better than white
Climate is defined by all of the following except for:________.
a. the state of the atmosphere at a specific time and place
b. the state of the atmosphere averaged over time at some place
c. governs fresh water supply, type of crops, distribution of plants and animals
d. is commonly a 30 year average of weather elements e. includes extremes in weather
I need help please!!! I swear this isn’t even in my text book!
Answer:
[tex]\huge\boxed{\sf Option \ B. }[/tex]
Explanation:
Cell Membrane:
are the outermost surface of the cell for animals and secondmost surface of the cell from plants after cell wall.Surface of the cell membrane:
Cell membrane is partially and selectively permeable which means that it only allows certain substances in and out of the cell.[tex]\rule[225]{225}{2}[/tex]
In an ecosystem that is not altered by humans or environmental disasters, a population
will remain close to carrying capacity. This is due to what factors?
Species competition and predator/prey relationships
Drastic decline in producers
Introduction of a new species
Unlimited food and water resource
Answer:
I think it's Species competition and predator/prey relationships
Explanation:
Hopefully this helps :)
wind is the horizontal movement of air caused by differences in air pressure | true or false
Wind is the movement of air produced by variations in temperature or pressure. There is a pressure gradient where there are pressure variations between two points, over which air moves: from the high pressure zone to the low pressure region.
Which activity of E. coli DNA polymerase I is responsible for proofreading the newly synthesized DNA
Answer:
Find you answer below:
Explanation:
5′ to 3′ exonuclease activity.
How does a possum in Florida adapt to the winter season?
Answer:
They spend the winter in dens. These dens are dry and safe for them to stay in, while the harsh winter storms rage above.
I hope this answers your question! Have a wonderful day.
Answer:
they find a den dunno how, but they do and wait it out like a wise man.
Explanation:
A sudden, violent, involuntary muscle contraction of a group of muscles caused by a disturbance in brain function is called a ______________________.
Answer:
seizure
Explanation:
Inside a muscle fiber, what triggers sarcomeres to contract?.
Answer:
It would be an Impulse.
Explanation:
When an impulse reaches the muscle fibres of a motor unit, it stimulates a reaction in each sarcomere between the actin and myosin filaments.
Does this help you??
Answer:
A sudden rise in cystolic Ca2+
_______, a dystonic reaction that results in muscle spasms in the neck, can be very painful for the client.
I think, Torticollis (I'm not completely sure)
Hope this helps!
At the end of meiosis I, two cells have been produced.How many replicated chromosomes are in each of these cells?
Answer:
23
Explanation:
At the end of meiosis-I, two daughter cells are formed having half the number of chromosomes present in diploid cell undergoing meiosis. Each cell has half the number of chromosomes present in the diploid cell.
how can the length of a DNA fragment be estimated in gel electrophoresis
Answer: At the same time as the samples, a DNA marker with known length fragments is routinely passed through the gel. You can estimate the length of the DNA fragments in the samples by comparing the bands of the DNA samples with those of the DNA marker.
Explanation:
1) What do you think made Rachel Carson's book, Silent Spring, so inspiring to readers?
What forms of hydrogen and oxygen are MOST
common on Earth?
A. Solid
B. Gas
C. Liquid
D. Plasma
Answer:
B
Explanation:
Hydrogen and Oxygen are the most abundant gases, being the first, and third most abundant.
Hope this helps, googIe only wanted to give me explanations on why Hydrogen is the most common element in the universe :/
The form of hydrogen and oxygen that are most common on Earth's surface is known as Gas. Thus, the correct option for this question is B.
What is the difference between hydrogen and oxygen?The difference between hydrogen and oxygen is that oxygen significantly contains eight electrons and eight protons while hydrogen contains only one electron and one proton. Oxygen is present in 21% of the earth's atmosphere, while hydrogen is present in 0.03% which is negligible.
According to the context of this question, oxygen is the first and most abundant gas in the earth's atmosphere and hydrogen is the third most abundant gas.
They are also present in the liquid and solid states but are in negligible amounts when treated with abnormal conditions like lower temperature and freezing.
Therefore, gaseous forms of hydrogen and oxygen are most common on Earth's surface. Thus, the correct option for this question is B.
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Gated ion channels for sodium and potassium open and close in rapid succession, causing the neuron to depolarize and then return to its normal resting level, during each:
Given what we know, we can confirm that this process happens in between each action potential.
What is an action potential?The action potential is the rapid polarization and depolarization of cells and cell membranes when they receive an impulse. In this case, the action potential is used to open and close the gated ion channels for sodium and potassium.
Therefore, we can confirm that gated ion channels for sodium and potassium open and close in rapid succession, causing the neuron to depolarize and then return to its normal resting level, during each action potential.
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Which Term means source of energy?
A. Carbohydrates
B. Carbon
C. Proteins
D. Lipids
E Nucleic acid
Some body please help me
Answer:
D. Lipids
Explanation:
A lipid is any of various organic compounds that are insoluble in water. They include fats, waxes, oils, hormones, and certain components of membranes and function as energy-storage molecules and chemical messengers.
Lipids are an efficient source of energy (9kcal per gram) that the body stores in relative abundance. They also play an important role as building blocks for cell membranes, hormones, and physiologically active substances.
Cells without a nucleus are
Answer: prokaryotic cells
Explanation:
A prokaryotic cell is a cell without a nucleus. Since this is a simple definition I cannot explain much further, but an example of a prokaryotic cell is bacteria.
The ____ is an early type of photographic process.
A food allergy is a reaction that occurs when the _____ system reacts to a harmless substance in food, such as a protein that does not undergo digestion.
A food allergy is a reaction that occurs when the body system reacts to a harmless substance in food, such as a protein that does not undergo digestion