Answer:
about 37.2 trillion cells in the average human body
Explanation:
20. Which of the following improves the efficiency of a machine?
Cal. Reducing friction
b. Adding more energy
c. Running it faster
Increasing friction
4. A friend says cells do nothing during
interphase. Do you agree or disagree?
Explain why.
Answer:
Disagree
Explanation:
During interphase, the cell copies its DNA in preparation for mitosis.
it spends its whole life doing this.
Which of these correctly relates the biomolecule with its function?
Answer:
There are four major classes of Biomolecules – Carbohydrates, Proteins, Nucleic acids and Lipids
Carbohydrate for energy, protein for building cells and other fuction like making structures like haemoglobin hair…etc, Nucleic acid for carrying hareditary material and lipids for insulation just to mention few
Answer:
waxes; prevents water loss and repels water
Explination:
Waxes, steroids, phospholipids, and triglycerides are all types of lipids. While their structures and functions all vary, they are all made of hydrocarbon chains that are hydrophobic. Triglycerides (fats) are the body's energy storage molecules. Steroids make up sex hormone and cholesterol. Phospholipids make up the cell membrane, separating the cytoplasm for the environment.
Question 7 of 10
5 Points
Temperature and pressure combine to keep the outer core in a
state,
O
A. liquid
O
B. solid
O
C. gaseous
O
D. plasma
SUBMIT
Answer: liquid
Explanation:
24. Since the relative concentration of water in the
pond in which a paramecium (a single-celled
organism) lives is greater than the concentra-
tion of water in its cytoplasm, water molecules
constantly move from the pond into the
paramecium. The best long-term solution to
the problem of maintaining a stable internal
environment is for the paramecium to
(1) change the water into carbon dioxide and
excrete it
(2) store water molecules
(3) incorporate water molecules into its
structure
(4) actively transport water molecules out of
its cell
Which is the answer?
Explanation:
4) actively transport water molecules out of its cell
Active transport is a mediated process that requires an energy input and the use of specialized membrane proteins to move against the concentration gradient. These proteins require energy in the form of adenosine triphosphate or ATP in order to facilitate necessary conformational changes to the large protein molecules to alter the spatial location of the molecule. For instance, with Na+, K+ pumps in cell membranes.
The paramecium would need to move the water molecules against their concentration gradient, out of the cell. Thus it would need to use active transport to pump water out and maintain its osmotic balance.
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The best long-term solution for a paramecium to maintain a stable internal environment when the concentration of water in the pond is greater than the concentration of water in its cytoplasm is through active transport of water molecules out of its cell.
Explanation:The best long-term solution for a paramecium to maintain a stable internal environment when the concentration of water in the pond is greater than the concentration of water in its cytoplasm is to actively transport water molecules out of its cell.
Paramecia have contractile vacuoles that collect and expel excess water to maintain water balance and prevent the cell from bursting in a hypotonic medium. This process requires energy but helps the paramecium regulate water movement and maintain internal stability.
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According to the phylogeny tree, which phylum of organisms are most closely related to chordates?
Answer:
Echinodermata
Explanation:
Plato Answer
Two rough black guinea pigs are bred and have two offspring. One of the offspring has rough white fur, and the other has smooth black fur. if these same parents are futher bred to produce many other offspring, what would be the expected genotypes and phenotypes?
Answer:
1. Describe the genotypes given (use your notes). The first two are already done. ... Ratios tell you there is an even chance of having offspring with black eyes as there ... homozygous recessive and the other is heterozygous, the phenotypic ratio .... rough coat, while the 2 Ddrr will have dark fur with smooth coat and the 2 ...
Explanation:1. Describe the genotypes given (use your notes). The first two are already done. ... Ratios tell you there is an even chance of having offspring with black eyes as there ... homozygous recessive and the other is heterozygous, the phenotypic ratio .... rough coat, while the 2 Ddrr will have dark fur with smooth coat and the 2 ...
Answer:
Parent 1 RrBb Parent 2 RrBb
Explanation:
Which water conservation strategy is used when a household installs a duel- flush toilet?
A- eliminating losses
B-reusing and recycling
C-limiting consumption
D-preventing pollution
Answer:
Answer is C.
When a household installs a dual flush toilet, the water is mainly conserved by limiting its consumption and thus eliminates the unnecessary loss of water.
Explanation:
A dual flush toilet is similar to a standard toilet but includes some water conserving features. It is an effective way to reduce the amount of water used in flushing . It has two buttons to select two different flush settings, one for the liquid waste and the other for solid waste. Normally less water is needed to get rid of liquid waste than solids. Some models of dual flush toilet system reuses the water in the hand washer for flushing. Standard toilets use siphoning action, where a siphoning tube is used to drain the waste. While flushing, a large volume of water enters the toilet bowl which fills the siphon tube and siphon pulls the waste and water down the sewer pipe. The siphoning action stops, when the bowl emptied and air enters the tube producing a gurgling sound. Dual flush toilet has a large hole at the bottom of the bowl and a wash down flushing design to push the waste down into the drain. This system needs less water per flush as no siphoning action is required. Also the waste is easily drained out of the bowl because of the large hole at the bottom of the bowl. In a dual flush toilet, the liquid waste flush utilizes only half the amount of water than the solid waste flush. The main disadvantage of a dual flush toilet is that it is more expensive than a normal toilet..
- what is the DNA sequence
Answer:
DNA sequencing is the process of determining the nucleic acid sequence – the order of nucleotides in DNA. It includes any method or technology that is used to determine the order of the four bases: adenine, guanine, cytosine, and thymine.
Answer:
A DNA sequence is the sequence of nucleotide bases stored in the nucleus of the cell. There are four different nucleotides, ATCG, which can be combined in various combinations and sequences to code for proteins needed to perform other functions in the cell.
Which of the following was NOT a weakness of the Articles of Confederation?
Othere is only one branch
there was no way to m
e laws:
there was no way to enforce laws
Congress had no power to levy and collect taxes.
Final answer:
One of the weaknesses of the Articles of Confederation was that Congress had no power to levy and collect taxes.
Explanation:
One of the weaknesses of the Articles of Confederation was that Congress had no power to levy and collect taxes. While Congress had the authority to coin and borrow money, it did not have the power to impose taxes on the states or collect revenue. This limitation made it difficult for the national government to fund its operations and fulfill its responsibilities.
1. There was just a single branch: There was only one branch of government because the Articles of Confederation established a unicameral legislature known as the Congress. This absence of partition of abilities was a shortcoming since it focused an excess of force in one body.
2. It was impossible to make laws: This is an inadequate choice. It appears to allude to the way that under the Articles of Confederation, Congress had the ability to make regulations, however it missing the mark on ability to successfully uphold them. This shortcoming made it challenging to lay out and keep up with the rule of law all through the country.
3. Laws could not be enforced: As previously stated, Congress lacked the authority to enforce its laws. This shortcoming brought about an absence of power and prompted a breakdown in policing, it trying to keep everything under control and resolve questions.
4. Congress lacked the authority to impose and collect taxes: This is a substantial shortcoming of the Articles of Confederation. The focal government missing the mark on power to force and gather charges from the states. This restricted the public authority's capacity to raise income and asset its tasks actually.
Congress's inability to levy and collect taxes was a weakness of the Articles of Confederation; the power to maintain an army was not a weakness.
Explanation:Weaknesses of the Articles of ConfederationAmong the various limitations of the Articles of Confederation, the inability of Congress to levy and collect taxes was a major weakness. The Articles only allowed Congress to request money from states, rather than impose taxes directly. Moreover, without the power to enforce laws, the federal government under the Articles had to rely on the states to execute its decisions, often leading to inefficiency and lack of uniformity. However, contrary to the given options, Congress did have the ability to create and maintain an army and a navy, regulate trade and commerce with foreign nations and among the states, declare war, and conduct foreign relations, which was not a weakness as implied by one of the choices. The national government's significant lack of enforcement powers and its inability to impose taxes made governing difficult and were rectified in the subsequent U.S. Constitution.
Therefore, the statement implying that Congress had no power to levy and collect taxes is NOT a weakness of the Articles of Confederation, but in fact, it was a prominent weakness that the national government faced during that time.
Which statements describe how maps represent Earth's surface? Check all that apply.
They show all or part of Earth.
They have a three-dimencional eurface
They show all or part of earth.
Explanation:
Maps are the pictorial representation of earth. The people who draw maps are called cartographers and the maps are represented usually as 2D images. A map of earth gives an idea about the differences in sizes of the countries of the world and various geographical features.
A map usually uses a scale which gives an idea about the relationship between distances on the map and actual distance on earth. Scales can be of different types like verbal scale, representative fraction, graphic scale etc.
Answer:
They show all or part of Earth.
They use symbols to represent land features.
They correspond to distances on Earth using a scale.
Explanation:
I was just on this question and this is what I got for my work.
what strain of bacteria enters normal epithelial cells most easily
Answer:
Ty2 strain present in the Salmonella typhi bacteria can easily enter into the epithelial cells.
Explanation:
This is the bacteria that causes the typhoid fever in humans. This disease affects greater than 21 million people worldwide annually. On severe cases it leads to death of the patient. The penetration into epithelium cell is one among the essential part in its parthenogenesis. Previous interaction of the bacteria along with the epithelial cell are much necessary before its invasion. The expression involves the adhesins and fimbria.
Earth is home to more than 20 million kinds of organisms, and all have DNA
made up of only four types of nucleotides. The bodies of each kind of
organism grow and function according to instructions in their DNA. How can
birds and dogs both use instructions in DNA to grow and function and still be
different organisms?
O
A. Their nucleotide bases have different effects on cells.
O
B. Their DNA molecules have different numbers of strands.
C. Their DNA molecules have different sugars.
O
D
Their nucleotide bases are in different sequences.
Answer:B. Their DNA molecules have different numbers of strands.
Explanation:that is chromosome that make them to differ in diploid numbers thus differ generally and appear differently
What best explains why offspring produced by the same parents do not typically have the same phenotype
Answer:
Because each parent has at least two genes to every phenotype so, in case they have one child there would be 4 possible phenotypes for each gene. A gene express the shape of your ear, the color of your eyes, how tall will you be etc.
HELP
DNA and RNA are both:
1. made up of nucleotides and carry molecules from one end of a cell to another
2. monomers of protein molecules that provide structure to a cell’s nuclear membrane
3. protein molecules that carry the unique genetic information of an organism
3. molecules that contain genetic information and are made up of nucleotides
Answer:
The correct answer is 4 molecules that contain genetic information and are made up of nucleotides.
Explanation:
DNA and RNA builds the genetic blueprint of the cell.DNA act as repository of genetic information.
The genetic information is stored in the nucleotides that builds up both DNA and RNA molecules.
The genetic information from DNA is transferred to mRNA and then from mRNA to protein by the help of transcription and translation process,both are important steps of central dogma of molecular biology.
Which six letters will not appear in the coded message? Give a reason for your answer.
Answer:
B,jo,u and y
Explanation:
I honestly dont know
Answer:
B, J, O,U, And Y
Explanation:
Coded messages are those written using codes. These codes can be numbers, drawings, geographic figures and even letters written in different orders or the omission of some letters. This type of message is designed to prevent anyone other than the intended recipient from viewing it. The concept of encrypted messages is an ancient one, since the Roman emperor Julius Caesar would have used a simple form of encryption to send messages to his generals.
When these messages use letters, it is common for the letters B, J, O, U and Y not to appear.
Which of the following is a medical professional that uses bones to help supply physical information about the deceased?
a pathologist
an odontologist
an osteologist
an archeologist
Answer:
Archaeologist.
Explanation:
I believe this is the only on of the four that deals with post-mortem study of bones, other than a forensic odontologist, who studies teeth and bitemarks, but not bones in general.
Answer:
an osteologist
Explanation:
Osteology is the science that studies the bones and the skeletal system as a whole. The osteologist is the professional responsible for this science and is able to use bones to help provide physical information about the deceased.
This is because the number of bones in a body can provide information about an individual's age, health and physical condition, which can generate many important changes.
Can someone help me list all the macromolecules food and the biomolecules inside it
Answer:
carbohydrates.
lipids.
proteins.
nucleic acids.
Explanation: Carbohydrates are the most abundant biomolecule on Earth. Living organisms use carbohydrates as accessible energy to fuel cellular reactions and for structural support inside cell walls. Cells attach carbohydrate molecules to proteins and lipids, modifying structures to enhance functionality.
The electron transport chain uses the energy stored in high energy electrons to pump H+ ions across the inner mitochondrial membrane. Why?
Explanation:
For ATP production in the electron transport chain.
a H+ concentration gradient is required for oxidative phosphorylation in the electron transport chain of the mitochondria, and thus the production of ATP the H+ ion gradient must favor the flow of electrons into the matrix of the mitochondriaHydrogen atoms contain 1 proton and 1 electron while being devoid of neutrons. When they lose their electron they form an ion or H+, a particle carrying a unit of positive charge. At the mitochondrial membrane, the outer membrane freely allows for the passage of H+ while the inner membrane does not. Mitochondria require H+ concentration gradients to produce ATP; i.e. high concentrations of of H+ in the intermembrane space and low H+ within the mitochondrial matrix.
The H+ being pumped outside the mitochondrial matrix leads to increased H+ within the intermembrane space, due to its high permeability. This forms a gradient where there is a differential in the number of protons on either side of the membrane the protons flow or re-enter the matrix through the enzyme ATP synthase, which makes the energy storage molecules of ATP from the reduction of ADP and inorganic phosphate, Pi.
Further Explanation:
During respiration in the mitochondria, oxidative phosphorylation occurs. This describes a process in which the NADH and FADH2 made in previous steps of respiration process give up electrons in the electron transport chain these are converted it to their previous forms, NADH+ and FAD. Electrons continue to move down the chain the energy they release is used in pumping protons out of the matrix of the mitochondria.
This forms a gradient where there is a differential in the number of protons on either side of the membrane the protons flow or re-enter the matrix through the enzyme ATP synthase, which makes the energy storage molecules of ATP from the reduction of ADP. At the end of the electron transport, three molecules of oxygen accept electrons and protons to form molecules of water.
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Final answer:
The electron transport chain pumps H+ ions across the mitochondrial membrane using energy from high-energy electrons, creating an electrochemical gradient used to drive ATP synthesis through a process called chemiosmosis.
Explanation:
The electron transport chain in mitochondria plays a pivotal role in cellular respiration by using the energy from high-energy electrons to pump H+ ions across the inner mitochondrial membrane. This process creates an electrochemical gradient, which is essential for ATP synthesis. High-energy electrons are donated by NADH and FADH2 and move through a series of protein complexes within the inner membrane. As electrons pass through the electron transport chain, they go from a higher to a lower energy state, which releases energy used to transport H+ ions against their concentration gradient from the mitochondrial matrix to the intermembrane space.
The accumulation of H+ ions in the intermembrane space generates a significant electrochemical gradient, comparable to water pressure behind a dam. This gradient represents stored energy that, when released through ATP synthase, an integral membrane protein complex, drives the synthesis of ATP. This diffusion of H+ through ATP synthase down their concentration gradient and the associated production of ATP is known as chemiosmosis.
What are proteins made from?
A. Fatty acids
B. Amino acids
C. Monosaccharides
D. Nucleic acids
Answer:
B. Amino acids, because proteins are made of many small units called amino acids. They're attached to each other creating a long chain.
Proteins are made up of amino acids, which serve as the monomers for protein synthesis. The fundamental structure of an amino acid consists of a central carbon atom bonded to an amino group (NH2), a carboxyl group (COOH), a hydrogen atom, and a variable “R” group. The 20 different amino acids can be arranged in different combinations to form the unique proteins found in living organisms.
Explanation:Amino acids are the monomers that make up proteins. All proteins are made up of different arrangements of the same 20 amino acids. Each amino acid has the same fundamental structure, which consists of a central carbon atom bonded to an amino group (NH2), a carboxyl group (COOH), a hydrogen atom, and a variable “R” group. The name "amino acid" is derived from the presence of the amino and the acidic carboxyl group.
WILL MARK BRAINY PLZ HURRYYYY
Which statement describes the difference between incomplete dominance and codominance? In codominance, only one allele is expressed in the offspring; In incomplete dominance, both alleles are expressed in the offspring. In codominance, both allels are expressed in the offspring; In incomplete dominance, only one allele is expressed in the offspring. In codominance, both alleles are expressed in the offspring; in incomplete dominance, the offspring demonstrate an intermediate form of the alleles from the parents. In codominance, the offspring demonstrate an intermediate form of the alleles from the parents; in incomplete dominance, both alleles are expressed in the offspring.
Answer:
c
Explanation:
When there is complete dominance, both alleles are expressed in the progeny; when there is imperfect dominance, the progeny exhibit an amorphous form of the parental alleles.
Two types of allelic associations that manifest in the heterozygous state are dominance and codominance.
In codominance, neither allele predominates over the other while nevertheless making an equal contribution to the phenotype of the progeny. In a codominant inheritance pattern, for instance, if one parent has red flowers (RR genotype) and the other has white flowers (WW genotype), the offspring may have both red and white flowers (RW genotype), displaying both alleles.
On the other hand, neither allele is totally dominant over the other in incomplete dominance. Instead, the children have a mixed or intermediate phenotype that is distinct from both phenotypes of the parents. For instance, in incomplete dominance, the offspring may have pink flowers (RW genotype), displaying an intermediate expression of the alleles, if one parent has red flowers (RR genotype) and the other has white flowers (WW genotype).
Hence The correct statement is in codominance, both alleles are expressed in the offspring; in incomplete dominance, the offspring demonstrate an intermediate form of the alleles from the parents.
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Which type of molecule will require energy to cross the cell membrane? Question 3 options: A) carbon dioxide B) Na+ C) nonpolar molecules D) oxygen
Answer:
B) Na+
Explanation: Na+ molecule is polar, oxygen and carbon dioxide are nonpolar molecules. The cell membrane is a phospholipid bilayer made up of lipid molecules with polar and nonpolar ends. Since it is a bilayer, two phospholipid layers are arranged, one on the other in such a way that one faces the back of the other. The non polar ends are away from outside and inside of the cell, while the polar ends faces towards all the molecules inside and outside the cell.
Since polar-polar molecules repel each other, Na+ can't pass through the cell membrane easily. So it uses the proteins attached the cell membrane inside and outside to transport such molecules by using energy in terms of ATP.
What is mitosis in a living cell?
a) the separation of the genetic material of a cell into two completely identical sets, one for each of the daughter cells created during cell division
b) the creation of two daughter cells with half the number of chromosomes that the parent cell has by the process of cell division
c)the creation of a larger amount of cytoplasmic material that can then be split among the daughter cells of a parent cell
d)the separation of existing genetic material by splitting chromatids at the centromere to create two similar nuclei in another cell
Answer:
A. the separation of the genetic material of a cell into two completely identical sets, one for each of the daughter cells created during cell division
Answer:
the answer is A
Explanation:
The diagram depicts the process of crossing over, which occurs between homologous chromosomes during gamete formation.
What is the result of this process
Answer:
1) An increase in offspring variation
Explanation:
One of the key feature of meiosis is the crossing over that allows exchange of genes among homologous chromosomes coming from both parents (mother and father). This process is very crucial and also the foundation of evolution because it increases the genetic diversity in the offsprings and helps them survive better in changing environmental conditions. The more distant parents will have children with more diverse genetic material as compared to those who are less distant (e.g. first cousins).
This is also the reason that first cousin marriages results into genetic diseases in offsprings. However, when the parents belong to two different ethnicities, it is almost impossible that they their children will have genetic diseases.
Metabolic pathways _____.
Metabolic pathways involve a series of biochemical reactions converting substrates to final products through anabolic and catabolic pathways.
Metabolic pathways are a series of sequential biochemical reactions that convert a substrate molecule through a series of metabolic intermediates to yield a final product. Anabolic pathways build complex molecules from simpler ones, requiring energy, while catabolic pathways break down complex molecules into simpler ones, producing energy. This balance between building (anabolism) and degradation (catabolism) constitutes metabolism.
Which of these would BEST describe what would happen to a cell in a time of low nutrient supply?
The cell's growth would speed up significantly, leading to longer periods of
time between cell division
The cell's growth would slow down significantly, leading to longer periods
of time between cell division
The cell's growth would speed up significantly, leading to shorter periods
of time between cell division
The cell's growth would slow down significantly, leading to shorter periods
of time between cell division
Answer:
The correct answer is B.
Explanation:
The cell's growth would slow down significantly, leading to longer periods
of time between cell division
Answer:
The cell's growth would slow down significantly, leading to longer periods of time between cell division .
Explanation:
Cell division occurs in two ways: meiosis and mitosis. Regardless of the form, the celual division always begins in a process called prophase. This process is essential for determining the speed of cell growth and the length of time that cell divisions will occur. This is because in this process the cell prepares to start cell division, in this process, the cell needs to absorb nutrients, water and energy that will be used during the process. If the cell is in an environment full of nutrients and water, it will grow faster and the time between cell divisions will be shorter. However, if the amount of nutrients and water is limited, the cell will take time to get the required amount, which will slow down its growth and increase the time between cell divisions.
A biology student wanted to study how the amount of light affects the growth of aquatic plants over the course of a week. She set up two tanks with four plants in each. Both tanks were identical in every way except for the amount of light provided.
What is one thing the student could do to improve the accuracy of her results?
Answer:Use a greater number of plants
Explanation:
A biology student wanting to study how the amount of light affects the growth of aquatic plants over the course of a week should opt for plants that have higher growth rate and choose more number of plants.
What are aquatic plants ?These are the plants which grow in water and these are accompanied by the water as their habitat.
Watery plants have thick cuticle covering on their plants where the waxy covering on their part help to minimise the damage they can cause to plants.
Ensuring that all the plants should get equal amount of light along with equal amount of nutrition along with equal conditions without any change in the experiment setup.
Taking up more number of plants will help to record in more and have a maximum of result without any much of exceptions. These kind of instructions will help the student in fetching up the positive result.
Therefore, It is wiser to give equal conditions to the plant along with more number of plants to be taken.
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as the mass of an object increases, so does its gravitational force. true or false
Answer:
false
Explanation:
Gravitational force has to do with the weight if the body
Answer:
True
Explanation:
The force that pulls other objects in will increase, but when it is being pulled towards something else, it will move slower and will need more force to be moved than something half it's size
Write the main sources of land
pollution and describe anytwo of them
Answer:
Basically land pollution is caused due to urbanization, mining, industrialization, landfill and improper waste disposal of agricultural chemicals . Major chemicals responsible are pesticides, lead, heavy metals, petroleum hydrocarbon etc.
Explanation:
Mining:
This creates large holes in the ground which in a long run causes soil erosion. Mining also removes the topsoil making teh soil barren land.It also releases harmful chemicals that contaminates the air and soil.
Industrialization:
The waste from the industry contains heavy metals in it. Which pollutes the urban soil as well as the cropland. Among all lead is most toxic that causes major part of land pollution.Also the chemicals makes the land infertile for making cultivation in it.
Main sources of land pollution are fertilizer use, overflowing landfills, deforestation, nuclear waste etc.
Explanation:
Land pollution is less visible when compared with water pollution but the effects of it are fatal. Several factors cause land pollution. In order to increase productivity agricultural sector uses chemical fertilizers and pesticides.
These chemicals remain in the soil and the soil gets depleted of its fertility and the soil gets poisoned. These chemicals may also get washed into nearby water sources polluting the water body as well. Overflowing landfills are also a major cause of land pollution.
It is not always possible to recycle all the waste generated. The waste that is dumped in landfills causes land pollution.
In the scientific method, how is a hypothesis tested
Answer:
By experimentation and observation