Answer:
Algae and sunlight
Explanation:
Algae provides nutrients to planktons enhancing their growth. The planktons are photosynthetic in nature. Energy from the sunlight is used by planktons during photosynthesis to make their own food thus increasing its population.
Why are cells generally so small? Select all of the answers that apply.
A. As they grow, their volume increases faster than their surface area.
B. As they grow, their surface area increases faster than their volume.
C. Moving nutrients across their cell membranes is more efficient.
D. Moving waste materials across their cell membranes is more efficient.
A, C & D
Usually as cells, and even organisms get larger, their surface area to volume ratio decreases. This is why it is important for cells to retain their relatively small size to keep a larger surface area to volume ratio.
Explanation:
A larger Surface area to volume ratio ensures that the cell can efecitnyl take up nutrients and excrete toxic metabolites. This ensures that the biochemical activities in the ell continue effectively to support the life process.
If cells were too large, it would take time for important substances like nutrients and oxygen to reach the center of the cell. On the other hand, toxic metabolites would accumulate in the cells because the rate at which they are eliminated is very low.
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The correct options are (A) As they grow, their volume increases faster than their surface area and C. Moving nutrients across their cell membranes is more efficient.
Cells are generally small due to the relationship between their volume and surface area. As a cell grows, its volume increases at a rate that is proportional to the cube of the linear dimensions (length, width, height), while the surface area increases at a rate that is proportional to the square of the linear dimensions. This means that the volume increases faster than the surface area. This is mathematically represented by the formulas for the volume (V) and surface area (SA) of a sphere, which is a common shape for cells:
[tex]\[ V = \frac{4}{3}\pi r^3 \][/tex]
[tex]\[ SA = 4\pi r^2 \][/tex]
where ( r ) is the radius of the sphere.
As the radius increases, the volume grows with [tex]\( r^3 \)[/tex], while the surface area grows with [tex]\( r^2 \)[/tex]. When the volume grows faster than the surface area, it becomes increasingly difficult for the cell to efficiently exchange nutrients and waste products with its environment. This is because the cell's metabolic needs, which are related to its volume, outpace the ability of its surface area to transport materials across the cell membrane.
Therefore, option A is correct because it accurately describes the geometric constraints on cell size due to the volume-to-surface-area ratio.
Option C is also correct because smaller cells have a larger surface area-to-volume ratio, which allows for more efficient transport of nutrients and waste products across the cell membrane. A high surface area-to-volume ratio ensures that all parts of the cell are close to the cell membrane, facilitating the diffusion of substances in and out of the cell.
Option B is incorrect because it states the opposite of what actually happens; the surface area does not increase faster than the volume as a cell grows. Option D is incorrect because it is a consequence of the efficient movement of nutrients. The efficient removal of waste materials is a result of the high surface area-to-volume ratio, which is a direct result of cells being small, as described in option C.
According to United Nations predictions, what will be the total population of the world by 2100?
A.9 billon
B.10 billon
C.11 billon
D.40 billon
E. 8 billon
Answer:
D 40 billion
Explanation:
Every 35 years the world population is expected to double, so you just follow those calculations.
Answer:
d. 40 billion
Explanation:
cycle
Which labels best complete the flow chart?
O
X: Producers undergo photosynthesis
Y Nitrogen compounds are released into the air
X Nitrogen compounds are released into the air
Y Producers undergo photosynthesis.
X Free nitrogen is in the atmosphere
Y Producers absorb nitrogen compounds through their
roots.
X: Producers absorb nitrogen compounds through their
roots.
Y Free nitrogen is in the atmosphere
O
Dosers
down
Answer:
X Free nitrogen is in the atmosphere
Y Producers absorb nitrogen compounds through their roots.
Explanation:
Nitrogen is present in the soil. The plants take up nitrogen along with other minerals as they draw water from the soil. Nitrogen enters the soil when decomposers feed on dead and decaying matter. They breakdown nitrogen and release it into the soil. The plants take this nitrogen from the soil.
The area labelled X shows that nitrogen is present in the air. Nitrogen is one of the abundant gases which is found in the Earth's atmosphere.
Scientists are testing substance L to determine how it enters mammalian cells in a culture. The cells maintain a 120 millimolar (mM) intracellular concentration of substance L. The scientists determined the rate of entry of substance L into the cells at various external concentrations of substance L (10 to 100 mM) in culture medium (Table 1). Table 1. Rate of entry of substance L into mammalian cells in culture External concentration of substance L (mM) Rate of entry of substance L into cell as a percent of maximum 10 5% 20 25% 30 45% 40 65% 50 80% 60 90% 70 95% 80 100% 90 100% 100 100% The cells maintain substance L at an internal concentration of 120 mM. (C) Predict the likely effect on the ability of substance L to enter the cells of substance L is attached to a large protein instead of free in the culture.
If substance L is attached to a large protein instead of being free in the culture medium, it will hinder its ability to enter mammalian cells.
Explanation:The ability of substance L to enter mammalian cells would be affected if it is attached to a large protein instead of being free in the culture medium. The rate of entry of substance L into the cells is determined by the concentration gradient between the external and internal concentrations. Diffusion is the process by which substances move from an area of higher concentration to an area of lower concentration. When substance L is attached to a large protein, it will hinder its ability to diffuse through the plasma membrane and enter the cells.
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The planet
has a diameter that is larger than the diameter of Mars but smaller than the diameter of Neptune.
A.Venus
B. Mercury
C. Saturn
D. Jupiter
Answer:
a venus it is similar size to earth and earth matches this description
Why are igneous rocks the best type of rock sample for radiometric dating
Answer:
Because igneous Rock is separated into different minerals. Radio carbon dating works by measuring the amount of carbon dioxide.
Due to the diverse minerals that are extracted from igneous rock. The process of radio carbon dating involves counting the amount of carbon dioxide.
What is radiometric dating?The best sorts of rocks samples to utilize for radiometric dating are igneous rocks. Elements are divided up into various minerals in the rock during the formation of igneous rock.
When minute quantities of radioactive impurities are created, they can be selectively integrated into materials like rocks and carbon, which is how radiometric dating, radio dating, or radioisotope dating is used to date them.
Therefore, when minerals in igneous rocks first develop, they frequently only contain the parent isotope and none of the daughter isotope.
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Cutting down forests changes the populations of more than trees. Imagine the organisms that lived in this forest. After the trees have been cut, fewer animals can survive here. What are MOST LIKELY the limiting factors in this case?
Answer:
oxygen, space, food and hunting areas
Explanation:
Compare and contrast complete co-dominance and incomplete dominance
Answer:
In complete dominance, only one allele in the genotype is seen in the phenotype. In codominance, both alleles in the genotype are seen in the phenotype. In incomplete dominance, a mixture of the alleles in the genotype is seen in the phenotype.
Explanation:
Which of these is an advantage of using natural gas?
A. It releases chemicals that become acid rain.
B. It is fairly safe for use in homes.
C. Equipment failure and human error can lead to gas leaks.
D. Scrubbers can be installed to reduce air pollution.
SUBMIT
Answer:
An advantage of using natural gas
It is fairly safe for use in homes.
Explanation:
They are cheap ,plentifully available throughout the world. It is has multiple uses such as cooking, heating, drying and also for industrial use. It can be used for power generation. Through it plastics, paints and fertilisers can be made. This is the cheapest source for the production of hydrogen. It can easily be shifted from the power plants to the residential areas. It leave any gaseous waste rather not polluting the underground water.
Natural gas advantage is it is fairly safe for use in homes. So option (b) is correct.
Modern technology and strict regulations ensure that natural gas appliances and infrastructure are designed with numerous safety features, making it a reliable energy source for cooking, heating, and other household uses.
This sets it apart from other options listed, such as releasing chemicals that become acid rain (A), the potential for gas leaks due to equipment failure or human error (C), and the installation of scrubbers to reduce pollution (D), which are not advantages but rather challenges or mitigation measures related to its use.
Overall, the safety and reliability of natural gas in home environments make it a favorable choice for many consumers.
A - 1.11L
B - 2.12 L
C- 4.24 L
D - 6.36 L
Answer:
A. 1.11L
I hope incorrect answer
Which day is considered to be the 1st day of the female reproductive system
Answer:
The day one starts with the first day of your periods when the blood and tissue lining the uterus (womb) break down and leave the body is considered to be the '1st day' of the 'female reproductive system'.
Explanation:
The periods, that is the 'first day of female reproductive system' starts during puberty and stops 'permanently at menopause'. The menstrual cycle starts with the 'first day of bleeding', which is counted as 'day one'. The menstrual cycle stops just before the "next menstrual period". Menstrual cycle normally ranges from 25 to 36 days. The periods may last anywhere from '3 to 8 days', but '5 days' is average.Analyze the property of water you investigated and provide some real-world applications of the
importance of this property of water.
Answer:
As the type of investigation is not discussed, lets answer the question generally.
Explanation:
One of the properties of water is that water in the form of ice is less dense as compared to water liquid water. This property of water lets fishes survive in conditions when the temperature is freezing.
The hydrogen bonds in water make the water turn into a vast, honeycomb structure when the temperature is below 4 degrees Celsius. This causes the ice to float on water and the fishes can stay alive in the liquid water underneath the ice.
Thermal capacity: Water has a great capacity to absorb heat without having to transmit it to another location and without "burning" it. This is very important, for the world we live in, because it allows vegetables to absorb a large amount of solar heat, without combustion, since these vegetables have water in their composition. Furthermore, it is the thermal capacity of water that allows our bodies to be cooled through perspiration.
Specific heat: It refers to the capacity of water to absorb a large amount of energy, to change 1ºC of its temperature. The importance of this is that regions close to bodies of water have a highly stabilized temperature, presenting cooler summers and warmer winters.
Universal solvent: Water has the ability to break an immense number of substances, dissolving them completely. This is very important for countless metabolic processes in our body, in addition to helping us ingest salt and sugar molecules.
Transport: Although it is a liquid, water has an incredible capacity to transport substances, liquids and even particles. Perhaps, this is the most important ability to keep us alive, because it is through the water present in our blood that the blood is able to transport innumerable molecules to our organs, such as proteins, nutrients, oxygen, among others.
Surface tension: This ability allows the water molecules to stay together, completely connected, allowing even insects to be able to pose on its surface. The importance of this is to prevent some liquids from mixing with the water leaving it contaminated.
After filtering by the nephron, where does the cleaned blood go?
ES
O
A. Ureter
O
B. Urinary bladder
.
HR
O
C. Renal artery
nike airline
O
D. Renal vein
Answer:
renal vein
Explanation:
The afferent arteriole collects blood from the glomerulus and extends o the renal tubule where it divides into capillaries that ramify the tubule. This blood is the collected by the venules that join into the renal vein which carries blood away from the kidneys. The filtrate in the collecting tubule becomes urine and trickles down into the collecting duct where it joins urine from other nephrons. The urine then flows into the pelvis via the urinary bladder through the ureter.
what would be the most likely result if humans stopped burning fossil fuels?
A) the greenhouse effect would become stronger.
B) the sea levels would rise more quickly.
C) there would be less carbon dioxide in the atmosphere.
D) the planet would become much warmer.
Explanation:
C) there would be less carbon dioxide in the atmosphere.
An environment's biology includes both abiotic factors like atmosphere, water, soil, sunlight and temperature; and biotic factors which are living components of the ecosystem. These factors lead to a gradual change of an ecosystem over time; however, humans drastically impact the environment through over-exploitation and pollution- we disrupt normal abiotic and biotic interactions. Furthermore, human impact can lead to population die-offs and extinction events, along with food and water scarcity.
Humans impact on the environment can manifest as:
burning fossil fuels- this reduces air quality and adds carbon dioxide to the environment leading to global warming; pollution- adding contaminants to the atmosphere, waterways, soil etc. urban communities also expand by cutting down trees in deforestation- this leads to erosion and flooding;Learn more about ecological succession at brainly.com/question/2456852
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Answer:
there would be less carbon dioxide in the atmosphere
Explanation:
0. Alana mailed 6 letters in (3 different mailboxes. She
put the same number of letters in each mailbox.
How many letters did Alana put in each mailbox? 6 2×3
Answer:
Alana put mailed 2 letters in each of the 3 mailboxes
Explanation:
Alana put 2 letters in each of the 3 different mailboxes, dividing the total of 6 letters evenly.
Explanation:To answer how many letters Alana put in each mailbox, we divide the total number of letters by the number of mailboxes. Alana mailed 6 letters in total and used 3 different mailboxes. So, we perform the division 6 ÷ 3 to find the number of letters per mailbox.
6 ÷ 3 = 2 letters per mailbox.
Therefore, Alana put 2 letters in each of the three mailboxes.
PLEASE HELP ME I'M LITERALLY GONNA CRY IF I GET THIS WRONG
A student adds a suspension of baker's yeast cells into bread dough. When this mixture is left in a large bowl undisturbed for several hours, the student returns to find that the bread dough has doubled in size. What gas molecule is responsible for this increase in dough size?
A. O2
B. N2
C. H2
D. CO2
Answer:
D. CO2 - Carbon(iv)oxide or carbondiooxide
Explanation:
Since CO2 is a product and not a reactant, the higher the temperature, the higher the rate of cellular respiration.
HURRY ON A ASSIGNMENT I WILL GIVE BRAINLIEST CHECK ALL THAT APPLY
IT IS A B AND D ANSWER IT AND ILL STILL MARK BRAINLIEST :^)
At the beginning of Day 1, there were one hundred of each color bean. Twenty of the dark red beans and thirty-five of the light red beans were eaten. What effect will this have on the population of the beans? Check all that apply.
There will be more dark red kidney bean survivors.
There will be fewer light red kidney bean survivors.
There will be more light red kidney bean offspring the next morning.
There will be more dark red kidney bean offspring the next morning.
There will be an even number of light red and dark red kidney bean offspring produced that night.
This is is referred to as evolution by natural selection.
Explanation:
According to the question, more light red beans are eaten everyday compared to dark red beans. Therefore there are higher chances of dark red beans reaching reproductive age than light red beans. Consequnetly, dark red beans are more likely to pass down their genes to next generation than light red beans. Over subsequent generations will have more and more darker red beans and the population will, therefore, evolve towards higher dark red color allelic frequencies.
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Answer:
There will be more dark red kidney bean survivors.
There will be fewer light red kidney bean survivors.
There will be more dark red kidney bean offspring the next morning.
If shell fragments are found in a rock sample, it is most likely
that the rock formed
a) on a mountian slope
c) from magma
b) on a glacier
d) in shallow water
Answer:
D
Explanation:
Shell fragments on a rock are usually results of shallow water.
According to the _______ hypothesis, the moon formed far away from the earth and was later captured by the earth's gravity. The most popular hypothesis for the moon's origin is the _______. Telescopes can be engineered to gather light from any portion of the _______. In 2021 the James Webb Telescope will begin operation focusing on infrared wavelengths and must be kept extremely _______. Scientists estimated the age of the universe to be nearly _______ billion years using Hubble's pictures and images from the Wilkinson probe.
Briefly explain why the moon doesn't have an atmosphere or plate tectonic activity.
Answer:
capture
giant impact hypothesis
electromagnetic spectrum
cold
14
The moon's mass is much lower than the earth's; therefore, its gravity isn't strong enough to hold an atmosphere. This lack of an atmosphere and the moon's small size allowed it to become cool enough to the point at which it completely solidified. Thus, the moon doesn't have any plate tectonic activity.
Explanation:
It should be noted that cccording to the capture hypothesis, the moon formed far away from the earth and was later captured by the earth's gravity.
The most popular hypothesis for the moon's origin is the giant impact hypothesis. Telescopes can be engineered to gather light from any portion of the electromagnetic spectrum.
In 2021 the James Webb Telescope will begin operation focusing on infrared wavelengths and must be kept extremely cold.
Scientists estimated the age of the universe to be nearly 14 billion years using Hubble's pictures and images from the Wilkinson probe.
Lastly, it should be noted that the moon doesn't have an atmosphere or plate tectonic activity because the mass of the moon is lower than that of the Earth.
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The Arizona poppy is a plant that is native to the Southwestern United States. Its orange flower blooms in the summer and the plant is covered in small hairs. It is an important part of an ecosystem because at least 46 different species of insects visit the flower for food.
As an Arizona poppy plant carries out photosynthesis, which of the following would not occur during stage 1 of the process?
A. Chlorophyll absorbs light energy.
B. Oxygen is released as a waste.
C. Water splits into hydrogen and oxygen.
D. Carbon dioxide is used to make glucose.
The process of making food by utilizing solar energy and inorganic reactant from the surrounding environment is called photosynthesis. The plants capable of photosynthesizing produces energy and food along with oxygen molecules.
The oxygen is not released as waste.
What is the reaction of photosynthesis?The plants have green coloured pigments called Chlorophyll in their cell organelle called chloroplast that absorbs the energy from the sun and also, the carbon dioxide and water from the surrounding area taken by the plants.The reactants carbon dioxide is utilized to generate glucose or the energy molecule and the water splits to produce the hydrogen needed in the chemical process and oxygen for the respiratory process.Therefore, option B. will not occur during stage 1 of the process.
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Can we recreate the way caterpillars morph into a butterfly and then evolve other animals or maybe humans
The recreation can be done by the process of CRISPR-Cas9 editing of gene.
Explanation:
The gene editing process is executed by Whiteman and his co-workers of California University by transforming fruit flies into a poisonous species. The monarch butterflies were made to undergo the process of this mutation of gene and were made eat milkweed of toxic category.
Through this process 3 CRISPR were edited to one gene to make a monarch caterpillar to eat milkweed. He was influenced by the evolutionary war between plants and insects which thrive him to discover this process.
At about 3 months a human embryo's nervous system has about how many cells?
Answer:hundreds of cells
Explanation: the fusion of male and female gametes forms a zygote, during early development one single cell divides in to two after few hours from fertilization. it furthers the division into four and which are made up of sixteen cells that is other-wisely called MORULA at the end of the third day. The cells continues the division at the of ninth day to form a BLASTOCYST which contains hundreds of cells.
the blastocyst must be able to attach to the lining of uterine where it derives every nourishment to grow and survive, without this there would be loss of such pregnancy
What is an example of mechanical weathering by gravity
Answer:
Abrasion
Explanation:
Mechanical weathering is generally called physical weathering where rocks are broken down physically. It means that the rocks are broken down into smaller pieces but the rocks' composition (chemically) is not changed.
There are different ways that rocks can be broken into smaller pieces physically and gravity helps can also cause it.
Abrasion is an example of mechanical weathering where rocks bump into each other and cause the rocks to breakdown because of the force of bumping into each other. Gravity plays a role when it comes to rocks on the mountain side.
When a rock on top tumbles down the side of the mountain, it bumps into other rocks along the way. Gravity is at play here because it pulls the rock downwards, causing it to tumble.
what is the main goal of DNA replication EDPUZZLE
The purpose of DNA replication is to produce two of identical copies of a DNA molecule. This is essential for cell division during growth or repair of damaged tissues. DNA replication ensures that each of the new cell receives its own copy of the DNA.
The main goal of DNA replication is produce two identical copies of daughter cells from the parent cells.
DNA is defined as deoxyribonucleic acid comprises of phosphates group,
deoxyribose sugar , amino acids base base pairs namely adenine, cytosine,
guanine and thymine.
It houses all the genetic makeup of living organisms and it produces DNA is
also known as the main purpose of DNA replication is to produce two
identical copies of daughter cells from the parent cells.
This process is very necessary for cell division during growth or repair of
worn-out tissues and also in the process of reproduction and production of
sex cells .
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If organism's genotype is BbGG, what are the organism's possible gamete combinations? (Remember to use for
Answer:
possible gamete combinations are
BB,bb,GG
Final answer:
The organism with genotype BbGG can produce two types of gamete combinations: BG and bG, because the B allele is heterozygous and the G allele is homozygous.
Explanation:
The organism's genotype is BbGG. When organisms produce gametes, which are cells used for sexual reproduction (like sperm and eggs), each gamete gets one set of chromosomes. This organism has two different alleles at the first gene locus (B and b), but the same allele at the second gene locus (G).
During gamete formation, alleles for different genes separate so that each gamete only gets one allele for each gene. In this case, the organism can produce gametes with combinations of BG and bG, since the genotype for the second gene locus is homozygous (GG), meaning it will always contribute a G allele.
The organism has a heterozygous genotype for the B gene locus and a homozygous genotype for the G gene locus, resulting in two possible gamete combinations: BG and bG.
GETS BRAINILIST!!!A __________ is a large area of thick ice that moves slowly. coastline delta dune glacier
bruh that is a glacier right
Answer:
Glacier
Explanation:
1. Photosynthesis and cellular respiration are often described in two ways: (1) They are chemically opposite; and (2) They have a relationship to each other. Explain what these two statements mean. Be sure to include the specific substances used and released by each process.
Answer:
Photosynthesis and cellular respiration are chemically opposite. The reactants of photosynthesis are energy, carbon dioxide (6CO2), and water (6H2O). The products of cellular respiration are energy, carbon dioxide, and water. The products of photosynthesis are glucose (C6H12O6) and oxygen (6O2), and the reactants of cellular respiration are glucose (C6H12O6) and oxygen (6O2). So, the processes' equations are chemically opposite. The relationship between photosynthesis and cellular respiration is such that the products of one system are the reactants of the other. Without photosynthesis, cellular respiration couldn't take place, and without cellular respiration, photosynthesis couldn't take place. It's like a cycle.
Explanation:
Photosynthesis and cellular respiration are often described in two ways: (1) They are chemically opposite; and (2) They have a relationship to each other. One is anabolic and one is catabolic.
What is photosynthesis ?It is the process by which plants prepare their food in the presence of sunlight with the use of water, carbon dioxide and this makes the glucose along with the release of energy.
Photosynthesis is the process in which the carbon dioxide along with water and sunlight binds up together in order to form glucose or the energy source that is the produced byproduct of photosynthesis.
Cellular respiration is the catabolic process where the carbon dioxide along with the water molecules break into energy. The product of cellular respiration is carbon dioxide and water with the formation of ATP,NADPH.
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Mitochondrion provide ribosomes with
A )atp for protein synthesis
B ) amino acids for protein synthesis
C) oxygen for respiration.
D ) carbon dioxide for the production of sugars
Mitochondria, known as the 'powerhouse' of cells, generates ATP which is used by ribosomes for protein synthesis. The other options provided in the question do not accurately represent the direct role of mitochondria in relation to ribosomes.
Explanation:The mitochondrion is often referred to as the 'powerhouse' of cells because it is primarily responsible for producing ATP (adenosine triphosphate), the main energy currency of cells. In the context of the options provided, the mitochondrion provides ATP (option A) for protein synthesis. To make it more specific, ATP produced by mitochondria is used by ribosomes to add each subsequent amino acid in the protein chain during protein synthesis. The other options such as providing amino acids for protein synthesis (option B), oxygen for respiration (option C), or carbon dioxide for the production of sugars (option D) do not correctly describe the direct involvement of mitochondria with ribosomes.
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Cross a red bull with a roan cow. Show the punnett square:
____% Red cow. ______% Roan cow
____% White cow
Answer:
Consider the alleles of the red cow to be CR, CR. Consider the genes of the roan cow to be CR and CW.
CR CW
CR CRCR CRCW
CR CRCR CRCW
The results of the punnet square show that there is a 50% chance that the offsprings will be red cow. The chances for Roan cow will also be 50%. The chances for white cow will be 0%.
Such kind of phenomenon is termed as co- dominance. In this case, the dominant allele is not fully dominant over the recessive allele.
Answer:
The chances of a Roan calf will be 50%. Red will as well be 50%. The chances of white calf will be 0%.
Explanation:
Select the most correct statement regarding nucleus acids
Explanation:
Nucleic acids are the biopolymers, or small biomolecules, essential to all known forms of life. The term nucleic acid is the overall name for DNA and RNA. They are composed of nucleotides, which are the monomers made of three components: a 5-carbon sugar, a phosphate group and a nitrogenous base
Final answer:
Nucleic acids are acidic due to their phosphate groups which can release a proton ionized at physiological pH levels, making them essential for cellular functions.
Explanation:
The most correct statement regarding nucleic acids is that they are acidic compounds first discovered in the cell nucleus and later found in the cytoplasm, mitochondria, and chloroplasts. Nucleic acids are high molecular weight, nitrogenous organic compounds essential for the storage, transmission, and control of cellular activities. A nucleic acid is defined as a polynucleotide, which is a polymer chain consisting of thousands of nucleotide units. Each nucleotide is made up of a nucleoside and phosphoric acid.
An acid is a substance that releases hydrogen ions (H+) in a solution. A positively charged hydrogen ion is simply a proton, which is prone to participate in chemical reactions. Nucleic acids release a proton (H+) from their phosphate group that is ionized at physiological pH, contributing to their acidic properties. Strong acids ionize completely in solution, while weak acids do not ionize fully, with some hydrogen ions remaining bonded within a compound.
In essence, nucleic acids are considered acids because each phosphate group in the nucleotide has one acidic hydrogen atom that gets ionized at physiological pH levels, making these compounds acids in the biological context.