Answer:
a reliable source
Explanation:
Devise a scheme to prepare 10^-6 dilution on a plate using the least number of sterile water dilution tubes.
Answer:
The serial dilution can be done by half- logarithmic dilution method.Explanation:
The following step explains the way to obtain [tex]\frac{1}{10^6}[/tex] dilution. The volumes taken are arbitrary.Take 1 micro-litre (ul) of the concentrated solution in a dilution tube. Add water to it till the total volume becomes 10 ml. Here the solution formed is [tex]\frac{1}{10^4}[/tex] diluted.Take 100 micro-litre(ul) of [tex]\frac{1}{10^4}[/tex] diluted solution to another tube and add 9900 micro-litre(ul) of water to it. Here the solution formed is [tex]\frac{1}{10^6}[/tex] diluted.To prepare a 10^-6 dilution with the least number of sterile water tubes, perform a series of serial dilutions, starting with a 1:10 dilution and repeatedly diluting the resulting solution by the same ratio until the desired 10^-6 dilution is reached.
Explanation:
1. Make a 1:10 dilution by taking 1 unit of A (such as 1 ml) and adding it to 9 units of sterile water. This will give you a 10^-1 dilution (B).
2. Repeat this process with B to get the 10^-2 dilution (C).
3. Continue this process until you reach the desired 10^-6 dilution.
This method ensures that you are using the least number of tubes by diluting sequentially rather than trying to make the 10^-6 dilution directly, which would require a tremendous amount of sterile water and be significantly less accurate.
Learn more about Dilution here:https://brainly.com/question/35454012
#SPJ3
in the reaction below how would adding more of product C affect the equilibrium of the system? A+B arrows both ways C+D
In the endothermic reaction below how would adding hear affect the equilibrium of the system? A+B + energy arrows both ways +D
In the following reaction, if you wanted to produce more hydrochloric acid (HCl2), what would you do? 4HCl + O2 arrows both ways 2H2O + Cl2
Answer:
First answer : equilibrium shift towards the formation of the reactants
Second answer : equilibrium shift towards the formation of products
Third answer : need to add more H2O.
Explanation:
In a reversible chemical reaction, the shift of equilibrium of the reaction towards the production of products or reactants is dependent on the abundance of reactants or products. As in the first question, if the products available are more (C) than the reactants, then the equilibrium of the reaction would shift towards the formation of the reactants (A and B). As in second question, If reactants available are more (heat addition) than that of products, then the equilibrium of the reaction would shift towards the formation of products (D). As in the third question, we want to generate more HCL, which is the reactant, so we need to increase the amount of product, so we need to add more H2O.
1 Point
Imagine that the population of moose in Yellowstone National Park
decreased after a particularly harsh winter.
How would a fast running speed be advantageous to a moose in this
population?
O
A. The moose would be more able to avoid predators.
O
B. The moose would be more able to defend its territory.
O
C. The moose would be more able to chase and catch prey.
O
D. The moose would be more able to protect its offspring.
SUBMIT
The answers are.
A. The moose would be more able to avoid predators.
C. The moose would be more able to chase and catch prey.
Explanation:
This moose population can use their speed to protect themself from the predators, but only protecting themself from predators won’t help them for their survival. They need food to live. Speed will help them to chase and catch the pray also. Since the population of moose in the Yellowstone National Park is less for them, it is very difficult to protect their territory by using their speed. They can use their speed to chase their prey. Maybe while chasing they ended up facing their predators, but they can use their speed to escape from them. Later, this will help them to make offspring also. Moose will be able to protect their offspring by running, but they should give food to the offspring also to survive.Answer:
A
Explanation:
What is a cell made out of
Answer:
Two-thirds of a cell is water, which means that two-thirds of your whole body is water. The rest is a mixture of molecules, mainly proteins, lipids and carbohydrates.
Will give Brainliest to the 1st person to answer this question! Explain at least two positive effects of the cell cycle on the human body. Use complete sentences.
Bet!
One of the two positive effects of the cell cycle would be how the immune system benefits because the cell cycle makes more white blood cells.
Unfortuantely I don't have any more than that so but this was the best i could remember good luck!~
Answer:
This is just to give the person above brainliest. But my answer is below
Explanation:
The human body would have more fresh cells and it would have more white cells which help the immune system
The following table describes several molecules and their functions. The molecules all belong to the same class.
Molecule
Function
Oleic acid used for energy storage and insulation in whales
Phospholipid component of cell membranes in plants and animals
Brassinosteroid steroid hormone involved in pollen elongation in plants
Which class of biomolecule do the molecules in the table belong to?
A. lipids
B. proteins
C.
nucleic acids
D.
carbohydrates
Reset
Next
Explanation:
The compounds are lipids
Organic compounds in nature may be large chains of monomers forming biological macromolecules which perform many essential functions in the body. Nucleic acids, sugars, proteins and lipids may be included. These are organic molecules, containing ringed or long-chain Carbons bound to oxygen (O), hydrogen (H), nitrogen (N), and phosphorus (P) elements; they are contained in important organic biomolecules, including proteins, nucleic acids, lipids, and carbohydrates.
Lipids serve as energy storage and chemical messengers for oils, saturated and unsaturated fatty acids with double bonds and waxes and steroids. Nevertheless, lipids consist of fatty acids and glycerol; they do not comprise a fixed set of monomers, and they are not polymers, unlike the other biological macromolecules. Such non-polar macromolecules can offer hydrophilic and hydrophobic properties through the arrangement of hydrophobic heads and hydrophobic fatty acid tails. Specific makeup: C, H, O; non-polar-a triple condensation reaction creates molecules bound to three long-chain carboxylic acids from a single hydroxyl (OH) alcohol.
Learn more about Lipid macromolecules at brainly.com/question/5094081
Learn more about proteins and carbohydrates at brainly.com/question/10744528
#LearnWithBrainly
Answer:
A - Lipids
Explanation:
I got it right.
Explain the function of Chromosomes. Use your knowledge of genes and DNA to
give your answer.
Final answer:
Chromosomes are structures comprised of DNA and proteins that contain genes, which code for proteins responsible for various traits and functions in the body. Humans have 23 pairs of chromosomes, including autosomes and sex chromosomes, with approximately 20,000 to 22,000 genes.
Explanation:
Chromosomes are essential structures within the cells of our body that carry out a vital role in heredity and gene expression. They are coiled structures composed of DNA and proteins, specifically histones, which help organize and condense the DNA into a compact form that can fit within the nucleus of a cell. During cell division, chromosomes ensure that DNA is accurately replicated and distributed to each new cell.
DNA within chromosomes is segmented into units called genes, which harbor the instructions for making proteins, the building blocks of our body. These proteins perform a multitude of functions, including building cellular structures, carrying out metabolic reactions, and responding to environmental signals.
Human cells normally contain 46 chromosomes, arranged in 23 pairs. Twenty-two of these pairs are autosomes, with the remaining pair being the sex chromosomes (XX in females, XY in males). The estimated 20,000 to 22,000 human genes are responsible for a huge variety of traits and functions. Genes contain the specific sequences of DNA that are transcribed and translated to create proteins. Each gene has multiple forms or alleles, which can result in variations in the physical manifestation of a genetic trait.
When warm air rises, air pressure
A. decreases
B. stays the same
C. increases
D. temperature doesn't impact air pressure
Answer:
When air rises air pressure increases as well
some substances such as mercury tend to be found in increasing concentrations as one moves up the food chain. what is the term for this?
Answer:
Biomagnification
Explanation:
Biomagnification can simply be described as the increase in the concentration of a toxin in the tissues of organisms as one moves up in a food chain. There might be a number of reasons for this increase in concentration of the toxin. Some of the reasons are:
The toxin, such as mercury, cannot be broken down in the bodies of the organisms.When the concentration of the toxin might increase as one moves up a food chain.In order for ground water to enter a well, the well must be deeper than the water
table.
true or false
True
Explanation:
To get water in the well, the depth of the well should be deeper than the water table in that region.The water table distance from the surface is varied with the locality. It depends on the availability of the source like rain, soil type which means that the soil which has a higher percolation rate will have a high water table, etc. Hence, when we did a well and the depth should be deeper than the water table for it gets water for a long time even in summers.1 Describe 2 ways that carbon is removed
from the atmosphere.
Carbon dioxide is removed from the atmosphere primarily through photosynthesis and enters the terrestrial and oceanic biospheres. Carbon dioxide also dissolves directly from the atmosphere into bodies of water (ocean, lakes, etc.), as well as dissolving in precipitation as raindrops fall through the atmosphere.
What approach is required to balance the objectives of sustainable development?
Balancing the objectives of sustainable development requires a(n)
approach
Answer:
The objectives of Sustainable development can be balanced by:
Explanation:
Sustainable development targets to promote the economic use of all resources by the current generations so that these resources can be retained for use by the future generations.This can be done by (considering the environmental factors only):Efficient and increased use of public transport system instead of private transport system as this will reduce the consumption of the non-renewable fossil fuels.Efficient and judicious use of electricity and power.Reduction in use of non-biodegradable wastes like plastics.Promoting afforestation.Answer:
systems :)
For all the plato users
how can humans have 1 of 4 different blood types?
Answer:
Blood type is an example of multiple alleles. That means there are more than 2 genes for a particular trait.
Explanation: A person can inherit:
AA or AO and be type A blood
BB or BO and be type B blood
AB and be type AB blood
OO and be type O blood
Where do plants get the energy they need to produce food?
Answer:Plants make food in their leaves.
Explanation: The leaves contain a pigment called chlorophyll, which colors the leaves green. Chlorophyll can make food the plant can use from carbon dioxide, water, nutrients, and energy from sunlight. This process is called photosynthesis.
Answer:
plants get the energy they need to produce food from the sun
What is true about elements and compounds? A. Elements contain two or more compounds. B. Compounds contain two or more elements. C. Compounds contain atoms; elements do not. D. Elements contain atoms; compounds do not
Answer: B) Compounds contain two or more elements
Explanation:
True about elements and compounds B. Compounds contain two or more elements . Therefore , B. Compounds contain two or more elements is correct .
An element is a substance that consists of only one type of atom.
Each element is defined by the number of protons in the nucleus of its atoms, known as its atomic number.
Elements cannot be broken down into simpler substances by chemical reactions.
A compound, on the other hand, is a substance composed of two or more different elements chemically bonded in fixed proportions.
The atoms in a compound are combined in a specific ratio based on their chemical properties.
Compounds can be broken down into simpler substances (elements or other compounds) through chemical reactions.
For example:
Water (H2O) is a compound made of two different elements, hydrogen and oxygen.
Carbon dioxide (CO2) is a compound made of carbon and oxygen.
So, option B is correct: Compounds contain two or more elements.
For such a more question on elements
https://brainly.com/question/13329948
#SPJ3
how does meiosis contribute to genetic variation, while mitosis does not?
Answer:
Mitosis produces two daughter cells that are genetically identical to the original parent cell. Therefore there is no variation (except when things like mutations happen).
Explanation:
I need an example of Bacteria, Archaea, and Eukarya.
Answer:
Both Bacteria and Archaea are prokaryotes, single-celled microorganisms with no nuclei, and Eukarya includes us and all other animals, plants, fungi, and single-celled protists – all organisms whose cells have nuclei to enclose their DNA apart from the rest of the cell
Bacteria, Archaea, and Eukarya are three domains of life. Bacteria are prokaryotic organisms, while archaea are also prokaryotic but have unique characteristics.
Explanation:Eukarya include plants, animals, fungi, and protists, and are characterized by having a nucleus and membrane-bound organelles.
Bacteria: An example of bacteria is E. coli, which is commonly found in the intestines of humans and other animals. Bacteria are prokaryotic organisms that lack a nucleus and membrane-bound organelles.
Archaea: Methanogens are an example of archaea. They are found in environments such as swamps and produce methane gas as a byproduct of their metabolism. Archaea are also prokaryotic organisms, but they have unique genetic and molecular characteristics.
Eukarya: Plants, animals, fungi, and protists all belong to the domain Eukarya. An example of a eukaryotic organism is a rose plant. Eukarya have a nucleus and membrane-bound organelles.
Learn more about Domains of Life here:https://brainly.com/question/32820008
#SPJ3
How many nadh molecules are created from the pyruvate molecules that enter the Krebs cycle?
Answer: Three molecules of NADH is produced from every molecule of pyruvate that enters the Krebs cycle.
Explanation: Pyruvate produced from glycolysis is broken down to Acetyl CoA which then enters the Krebs cycle. In Krebs cycle, each molecule of acetyl CoA yields one molecule of GTP (ATP), one molecule of FADH2 and three molecules of NADH. The main purpose of Krebs cycle is to generate NADH needed in the cells. Krebs cycle is a series of eight enzyme catalyzed reactions which oxidizes the Acetyl CoA produced from pyruvate. The NADH molecules are produced by dehydrogenase enzymes:
1). Isocitrate dehydrogenase which converts isocitrate to alpha ketoglutarate.
2). Alpha ketoglutarate dehydrogenase which converts alpha ketoglutarate to succinyl CoA.
3). Malate dehydrogenase which converts malate to oxaloacete.
Which of the following is not a component of soil?
a. organic material
b. minerals
gases
d. none of the above
Please select the best answer from the choices provided
OOOO
The answer is none of the above because organic materials, gasses, and minerals are all component soils.
Hope this helps!!!!!!!
Please give brainliest!!!!
Answer:
I'm not sure but i think its D
Explanation:
The force that contributed to the formation of planets, determines the motion of bodies in the solar system, and pulls objects to the center of Earth is called ____.
The principle that states that an object at rest will stay at rest and that an object in motion will stay in motion is the law of _____.
Answer:
The force that contributed to the formation of planets, determines the motion of bodies in the solar system, and pulls objects to the center of Earth is called Gravity.
isaac Newton's first law of motion, also known as the law of inertia,
Explanation:
Answer:
First blank is gravity second blank is inertia
Explanation:
Choose the answer that best describes gravity.
Question 2 options:
Gravity only works between planets.
Gravity is a contact force that holds objects down on Earth.
Gravity is a contact force that holds the Moon in orbit around Earth.
Gravity is a non-contact force that holds the Moon in orbit around Earth.
"Gravity is a contact force that holds objects down on Earth" best describes gravity.
Answer: Option B
Explanation:
Gravity is the force which attracts two bodies one to the other. It is the force which causes objects in the air to fall to the ground and keeps the planets around the sun in their orbit. The greater an object's mass, the greater its gravitational power.
Gravity declines with elevation, near the Surface of the earth (sea level), so that at one-half of the Earth's radius, linear extrapolation will give zero gravity. The gravity of Planet originates from all of its mass. All its mass causes the whole mass in one's body a collective gravitational pull on.
What are the possible genotypes for blood type B
Answer: IBIB and IBi
Explanation:IBIB is a homozygous dominant and IBi is a heterozygous B blood type.
The process of using any of the five senses to gain information about an environment or about a problem.
Answer:
each sense ( eyes ears nose mouth ect.) sends electrical pules through the nerves or "messages" to the brain. which then processes it and turns it into information so that you can understand what you are seeing, hearing, tasting ect
does that help?
Observation is the process of using any of the five senses to gain information
The five sense of the body includes Touch, Sight, Hearing, Smell and Taste The sense organs which perform these function are Skin/Hair, Eye, Ear, Nose and Tongue respectively.
Let understand that Observation mean the process of acquiring information from a primary source.
The organs perform various observation on an environment or a problem by interacting with the brain through the nerves attached to them.
Learn more about Observation here
brainly.com/question/17304974
B is a gene for blue feathers,and b is a gene for red feathers. Two heterozygous birds have an offspring. What percentage chance does it have for red feathers. A 0 b 25 C
75 or D 100
Answer: b) 25
Explanation: B is a gene for blue feathers and b is a gene for red feathers, the genotype for a heterozygous bird is Bb. A cross between two heterozygous birds will produce 1BB, 2Bb and 1bb. Genotype BB and Bb will manifest outwardly as blue feathers while Bb will manifest as red feathers. Only one out of the four offsprings are red feathered. The percentage of the offsprings that are red feathered is 1/4 x 100 = 25
See attached for more information
When crossing two heterozygous birds (Bb) for feather color, the offspring have a 25% chance of being homozygous recessive (bb) and having red feathers. This is determined by the Punnett square, which predicts the genotypes of the offspring from the parental genes. B)
The question is asking about the probability of offspring with a particular phenotype given the genotypes of the parents. In this case, B represents a gene for blue feathers, which is dominant, and b is a gene for red feathers, which is recessive. When two heterozygous birds (Bb) are crossed, the Punnett square analysis reveals the probabilities for the offspring's genotypes and phenotypes.
Here is how you would set up the Punnett square:
Place one parent's alleles at the top of the Punnett square, B and b.
Place the second parent's alleles on the left side of the Punnett square, B and b.
Fill in the squares by combining the alleles from each parent to predict the potential genotypes of the offspring.
The resulting genotypes of the offspring will be:
BB (blue feathers, because B is dominant)
Two squares of Bb (also blue feathers because B is dominant)
One square of bb (red feathers because there is no dominant B allele present)
Thus, there is a 25% chance that an offspring will have red feathers (genotype bb).
So the correct answer is B, 25% chance for an offspring to have red feathers.
Using the genotypes and phenotypes provided from the iguana gene pool, which statement is NOT correct?
Answer:
D) Crossing an iguana with webbed feet with one with no webbing would produce iguanas ALL with no webbing because this is the dominant trait.
Explanation:
I just did the usatestprep and got it right ;)
Answer
IF YOUR ON usa testprep the answer would be D...
Crossing an iguana with webbed feet with one with no webbing would produce iguanas ALL with no webbing because this is the dominant trait.
Hey, biology help needed. All questions please. Extra points!!!!
Answer:
13. C
14. C
15. B
16. B
17. B
Explanation:
13. Having a long neck is a selective advantage for giraffes. Their long necks make them better suited to reaching food supply at the top of trees, improving their fitness and chances of reaching reproductive age and passing on traits to the next generation. This is how natural selection acts on these traits meaning that over time, giraffes evolve a long neck.
14. The variation in the mice tail length has shifted over time, which suggests that the frequency of the alleles that control tail length has changed. This is clear when you look at the peak of the graph, which has shifted towards longer tail lengths. This suggests alleles coding for longer tail lengths are becoming more common, with the loss of shorter tail lengths
15. If a mutation spontaneously appears in the rabbit genome that makes them resistant to the virus, then they are much more likely to survive than other members of their population. This selective advantage means they are more likely to reach sexual maturity and reproduce, passing the mutation on to the next generation, where they also will benefit. Rabbits breed a lot and quickly, so natural can happen reasonably quickly in these populations, meaning the numbers of resistant rabbits will rise.
16. A vestigial structure is one that is now redundant. That means that the organism no longer uses it. These remain because there are no real selective pressures acting on them that would cause their disappearance to accelerate. Instead, they remain. These bones indicate that at one point, whale populations used to have additional limbs, suggesting they evolved from four legged animals.
17. Changes in the genetic code of an organism can sometimes produce effects such as changes to protein structure, composition, and amount. These can have changes on a much larger scale such as in the structure of forelimbs. Beneficial changes will be positively acted on by natural selection. For example, a bat could develop a stronger wing structure for rapid flying, where as the whale forelimbs are very large to make them powerful in the water. Natural selection can only act on these changes if they are heritable, meaning they have to have changed in the DNA. Any physical changes not present in the DNA will not be passed on to the next generation or undergo evolution.
What are the functions of lipids?
The starting cell must duplicate its Chromosomes in interphase before mitosis can being? Does this change the number of chromosomes? Chromatids? both? how many of each would you expect in a human cell after interphase
Answer:
The correct answer is both.
Explanation:
Each chromosome is made up of a pair of sister chromatids which remain attached to each other at the centromere.During DNA replication the DNA duplicates, which means that if initially in the parent cell 'n' chromosomes were present then, after duplication, the number of chromosomes in the cell will be '2n'.As mentioned above, each chromosome has a pair of sister chromatids, that is, two chromatids per chromosome. So, 'n' chromosomes will have '2n' chromatids. Hence, '2n' chromosomes will have '4n' chromatids.In a parent cell,Before duplication, number of chromosome = n, number of chromatid = 2n.After duplication, number of chromosome = 2n, number of chromatid = 4n.The cell cycle proceeds as, G0, G1, S, G2, M.G0 represents the interphase. It occurs before replication or duplication of the chromosomes, which occurs in the S phase.So, in G0 phase, the chromosome number is 'n' and chromatid number is '2n'.DNA REPLICATION:
DNA replication is the process by which the DNA of a cell is doubled prior to cellular division. DNA replication occurs at the S-phase of the interphase stage of mitosis and meiosis. The DNA is doubled and represented by an increase in number of chromatids in each cell. The chromosome number does not change from 46 in a diploid cell (2n). However, the number of chromatid changes from 46 to 92 in each cell. After interphase stage, two chromatids each is expected to be present in each human cell.Learn more at: https://brainly.com/question/11554563?referrer=searchResults
2 Points
What question did Hardy and Weinberg want to answer?
O
A. Are all traits in plants controlled by genes?
O
B. Is it possible to breed a plant to have certain traits?
O
C. How does allele frequency change between generations?
O
D. How large is the gene pool for a given organism?
SUBMIT
Answer:
the answer is C. How does allele frequency change between generations?
hope it helps!
Answer: c
Explanation:
When people deciphered DNA, they put it _______________.
a. on the internet
b. in a top-secret government computer
When people deciphered DNA, they put it in a top-secret government computer
Answer: Option B
Explanation:
The deciphering of DNA present the genealogy of the person whose DNA has been deciphered. When someone that is a scientist deciphers DNA on someone request, to produce their genealogy and family tree, that is put on internet.
The top secret government computer builds the DNA data base, named CODIS, thereby, now when the DNA deciphering is in use for surveillance purpose and building Human Genome on whole within the Human Genome Project. The top secret government computer is not accessible by any civilian and is under military control for vigilance.