Answer:
4
Explanation:
carbon atoms only have four valence electrons so they can only bond with 4 other atoms
Answer: Four (4)
Explanation: Carbon has a total of six electrons in its shell but has four (4) electrons in its outermost shell. Electrons found in the outermost shell are called valence electrons. This means that carbon needs four (4) electrons to complete its octet structure that is carbon needs four electrons to attain a stable octet structure of noble gases.
A ____ is a prediction of an outcome and the basis for experimentation.
a. hypothesis
b. conclusion
c. constant
Answer: A.
Explanation: A hypothesis is what you think may happen before you actually do the experiment to see what really happens. Usually one of the first steps of an experiment.
What is the density of a liquid that has a volume of 20 mL and a mass of 3 g?
Explanation:
Given:
Volume of a liquid(V) = 20ml and
Mass of a liquid(M) = 3g
To find, the density of a liquid( [tex]\rho[/tex] ) = ?
We know that,
Density([tex]\rho[/tex] ) = [tex]\dfrac{Mass(M)}{Volume(V)}[/tex]
Density( [tex]\rho[/tex] )= [tex]\dfrac{3}{20}[/tex]
Density( [tex]\rho[/tex] )= [tex]0.15\dfrac{g}{ml}[/tex]
Thus, the density of liquid is [tex]0.15\dfrac{g}{ml}.[/tex]
If one has 24 kg of Polonium and it undergoes two half-lives, how much do you have left?
A) 12 kg
B) 3 kg
C) 6 kg
D) 2 kg
how much thermal energy needs to be added to 0.455 kg of benzene to heat it from 30*c to 50*c
15834 joules is the thermal energy required.
Explanation:
Specific heat capacity of benzene= 1.74 J/gK or 1740 J/Kg K
mass of benzene = 0.455 kg
temperature change= 50-30
= 20 degrees
From the formula:
Specific heat capacity= thermal energy/ (mass)*(temperature change)
thermal energy= 0.455* 1740*20 ( speicfic heat of benzene is converted
to joules per gram)
= 15834 joules
What will happen to the species in this ecosystem if the water temperature increases close to the warmest temperature shown on the diagram?
The species will either adapt, migrate, or continue the circle of life.
Answer:
Species B will survive and Species A will die out
Explanation:
I just got it right
The more mass an object has, the ____________ inertia it has
Answer: greater or more inertia it has.
Explanation: more massive objects have greater inertia and are harder to stop.
Answer:
The more mass an object has, the more inertia it has
Although fertilizers have been very important in increasing the food supply, there have
also been negative effects from the overuse of fertilizers. How can the overuse of fertilizers
kill crop plants?
A. It can cause salts to build up in
the soil.
B. It can cause roots to absorb too much nitrogen.
C. It can cause transpiration rates to increase.
D. It can cause soil to erode at a
faster rate.
Final answer:
Overuse of fertilizers leads to the buildup of salts in the soil, causing dehydration of plant cells and potential death of root tips, which can ultimately kill crop plants by preventing water absorption.
Explanation:
The overuse of fertilizers can kill crop plants primarily because it causes salts to build up in the soil, leading to a condition known as salinization. This buildup of salts occurs because fertilizers are composed of various plant nutrients that, much like table salt, are also salts. These salts begin to diffuse and move away from where they are applied, diluting and spreading the fertilizer. If a high concentration of fertilizer is applied, then more water is drawn from plant roots and soil, leading to dehydration and collapse of plant cells. In cases of limited soil moisture, the damage to the plant can be severe, with water being drawn out of the roots to the point where they cannot recover. Excessively high levels of salt in the soil can prevent plant roots from absorbing water efficiently, potentially causing the root tips to die.
A carbohydrate polymer composed of beta-glucose subunits is called
Answer:
Glycogen. The principal storage polysaccharide in animal cells; formed from glucose and stored primarily in the liver and , to a lesser extent, in muscle cells.
Explanation:
Which is a type of irradiation used to prevent food-borne illnesses?
Answer:Gamma
Explanation: Gamma can be used to destroy different bacteria that causes food poisoning, it can also be used to preserve food and also serve as a prevention against spread of pests. irradiation can serve many purposes. Gamma radiation is used for treatment which include killing of bacteria and deinfestation of agricultural product. It is used to kill microorganisms on a variety of product, and it is ideal for many products. Irradiation is the process of exposing food to a very high source of energy. Gamma irradiation make use of high energy gamma rays that are emitted by radioactive cobalt 60 or Cesium 137.
ocean acidification and its relationship to pH a
hi1
Answer:
Ocean acidification: Ocean acidification refers to the decrease in the pH of ocean water.
The pH of ocean water decreases due to the increased in the carbondioxode emissions in the atmosphere because of the burning of fuels. This carbondioxode is dissolved in the ocean water and forms carbonic acid. This carbonic acid is responsible for increasing the pH of ocean water. In one and half century, there is 30% increase occurs in the acidity of ocean water.
Help!!! 25 points!!!!
The hurricane center is MOST likely to be near location ___________ on Monday afternoon.
A) I
B) II
C) III
D) IV
Biology DNA:
-
The bases match up as follows;
Answer:
Adenine, A match-pairs with Thymine, T while Cytosine, C pairs with Guanine, G.
Explanation:
Normally, complementary DNA strand obeys Chargaff's rule of base-pairing in 1: 1 ratio, in a scenario with a template strand where a purine pairs with a pyrimidine via hydrogen bonds to create a novel 3-dimensional (3D) DNA structure.
Pyrimidines are normally Cytosine, C and Thymine, T; while Purines are Guanine, G and Adenine, A. So through complementarity, a purine, G must bind a pyrimidine, C and same case for A to T.
A _____ is an ancestor to chloroplast.
A) Aerobic Bacteria
B) Anaerobic Bacteria
C) Mitochondria
D) Animal Cell
Answer:
Aerobic Bacteria
Explanation:
I hope you get this correct
Drag each label to the correct location.
Sort the examples into proper mechanisms of reproductive isolation,
Prezygotic Isolation
Postzygotic Isolation
Two species of guppies show different
mating behaviors.
A hybrid zygote of two species dies
after a few cell divisions in the
mother's womb.
Brown bears and polar bears are
separated by geographical area.
Twin closely related species
Two species of plants reproduce
Answer:
Prezygotic Isolation: Two Species of Guppies, Brown Bears and Polar Bears, Two closely Related Species of frogs.
Postzygotic Isolation: A hybrid zygote of two species, Two species of plants reproduce
Explanation:
Prezygotic isolation includes mechanisms that do not allow breeding of organisms. Postzygotic isolation includes mechanisms that cause isolation of species after fertilization.
This is the answer that I got when I submitted it on Edmentum and it said I was correct.
Prezygotic Isolation: Two Species of Guppies, Brown Bears and Polar Bears, Two Closely Related Species of frogs.
Postzygotic Isolation: A hybrid zygote of two species, Two species of plants reproduce.
What is Prezygotic isolation?Prezygotic isolation may be defined as a mechanism of reproductive isolation through which two individuals of the same species are isolated from one another prior to mating and fertilization.
Prezygotic isolation prevents the formation of a zygote. It provides the chances for natural selection.
Postzygotic isolation may be defined as a mechanism of reproductive isolation through which two individuals of the same species are isolated from one another after the event of mating and fertilization.
Therefore, it is well described above.
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What statement is true about heterozygous organisms?
Heterozygous organisms are more diverse than homozygous organisms.
Heterozygous organisms can show either the dominant or the recessive trait.
Heterozygous organisms always show the recessive traits.
Heterozygous organisms have very low genetic diversity.
Answer:
the first one is correct
Explanation:
Final answer:
Heterozygous organisms can show either the dominant or the recessive trait, due to the Law of Dominance, which states that the dominant allele masks the effect of the recessive allele in heterozygous individuals.
Explanation:
The statement that is true about heterozygous organisms from the given statements is that they can show either the dominant or the recessive trait. This is due to the Law of Dominance, which states that in a heterozygote with one dominant and one recessive allele, the dominant trait is expressed in the phenotype. Thus, heterozygous organisms (Tt) will exhibit the same phenotype as homozygous dominant organisms (TT), while the recessive trait (tt) is only expressed in homozygous recessive individuals.
How does replication work?
A researcher incubates a cell with radiolabeled amino acids. These amino acids are incorporated into the proteins as they are synthesized by the cell. Select which piece of data would indicate the incorporation of radiolabeled amino acids during protein synthesis? A) Radioactivity levels would increase first at the nucleus, followed by the Golgi, and then the cell membrane. B) Radioactivity levels would increase first at the nucleus, followed by the ribosomes, and then the secretory vesicles. C) Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the Golgi, and then the secretory vesicles. D) Radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the nucleus, and then the secretory vesicles.
Answer:
The incorporation of radiolabeled amino acids during protein synthesis occurs when the data shows the organelles involved with protein synthesis, packaging and transport, that is, radioactivity levels would increase first at the rough endoplasmic reticulum, followed by the Golgi, and then the secretory vesicles (option C).
Explanation:
Protein synthesis in the cell occurs when RNA -which contains the sequence of triplets or codons that make up the genetic code- is coupled to ribosomes.
Each codon or triplet, consisting of three nucleotides, will give instructions for specific amino acids to be incorporated into the polypeptide chain that is being synthesized in the rough endoplasmic reticulum.
The Golgi apparatus is responsible for packaging or packaging the newly synthesized proteins in secretory vesicles for transport.
In consecuense, radioactivity levels would increase in the organelles involved in protein synthesis, packaging and transport, the rough endoplasmic reticulum, Golgi apparatus and secretory vesicles, respectively.
Learn more:
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Answer:
c
Explanation:
took the usa test prep
Explain why the soil doesn’t qualify as an organism despite containing billions of living cells
Answer:
Soil doesnt qualify as an organism despite containing billions of living cells simply due to what soil is. Soil is organic remains like decomposed organisms, minerals, and rock. It supports life but doesn't it doesnt have life itself. It doesn't breathe,grow, or eat.
Explanation:
The reason why soil does not qualify is because of organic.
Why the soil doesn’t qualify as an organism?Soil doesn't qualify since an organism contains billions of living cells simply because of what soil is. Soil is organic remains such as decomposed organisms, minerals, and rock. It supports life but doesn't it have life itself. It can't breathe,grow, or eat.
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What are the macromolecules DNA and RNA referred to as?
Answer:
Nucleic Acids
Explanation:
Between carbohydrates, lipids, proteins, and nucleic acids, DNA and RNA molecules most accurately fall under the macromolecular category of nucleic acids.
DNA and RNA are referred to as nucleic acids. DNA holds genetic information and controls cellular activities, while RNA is involved in protein synthesis. Both play critical roles in the continuity of life.
Nucleic acids are critical for the continuity of life because they carry a cell's genetic blueprint and instructions for cellular functioning.
DNA stands for deoxyribonucleic acid and is the genetic material found in all living organisms.RNA stands for ribonucleic acid and is primarily involved in protein synthesis.DNA has a double-helix structure, which is essential in storing and transmitting genetic information.Nucleic acids are composed of monomers called nucleotides, which consist of a phosphate group, a sugar, and a nitrogenous base.DNA controls cellular activities by regulating genes, while RNA serves as an intermediary in the synthesis of proteins based on DNA's instructions.2.The new codon that you answered for #1 codes for which amino acid? Only give the three letter prefix for your answer.
3.This type of mutation is called a __________ mutation when there is a simple change in one base of the gene sequence.
Ex:
Original:
The fat cat ate the wee rat.
Mutation:
The fat hat ate the wee rat.
4.Did this mutation have an effect on the outcome compared to the normal sequence?
Explanation:
Question 2 is incomplete.
3. A mutation that only affects a single nucleotide of nucleic acid is known as Point Mutation.
In Point mutations there is substitution of one base for another.
Example: TAT TGG CTA
TAC TGG CTA
The TAT changes to TAC which shows point mutation.
4. Yes. The point mutation have an effect on the outcome compared to the normal sequence.
When there is a change in one base of the gene it results into causing disease such as cancer, sickle cell anemia.
A silent mutation is a mutation where the new codon codes for the same amino acid as the original codon. A point mutation is a type of mutation that involves a simple change in one base of the gene sequence. The mutation in the given sequence is a point mutation where the base 'c' in the codon 'cat' was changed to 'h' in the codon 'hat'. The effect of this mutation on the outcome depends on the context and purpose of the sequence.
Explanation:The new codon that codes for the same amino acid as the original codon is called a silent mutation. For example, if the original codon is AAA for lysine, and it is mutated to AGA for arginine, both amino acids are basic amino acids and the protein may not be affected. It is important to note that a change in the third base of the codon, called the wobble base, may still permit the correct incorporation of the same amino acid into the protein.
A point mutation is a type of mutation that involves a simple change in one base of the gene sequence. This can include silent mutations, missense mutations (where the codon codes for a different amino acid), or nonsense mutations (where the codon becomes a stop codon).
Based on the given information, the mutation in the sequence "The fat hat ate the wee rat" compared to the normal sequence "The fat cat ate the wee rat" is a point mutation where the base "c" in the codon "cat" was changed to "h" in the codon "hat".
What does a model of the rock cycle show?
a. the amount of earths carbon cannot be determined
b. the amount of earths carbon increases
c. the amount of earths carbon decreases
d. the amount of earths carbon is constant
Answer:
I believe it’s “B”
Explanation:
Answer:
d. the amount of earths carbon is constant
Explanation:
Rock cycle is the name given to the natural process of transformation of the roots, capable of changing their moneralic composition. This cycle is proof that the terrestrial lithosphere has a dynamic character, which is the result of the actions of several endogenous and exogenous factors on the terrestrial surface. This cycle also allows us to understand how the amount of carbon in the earth is constant, allowing the transformation of the rocks in an evident way. It is through this process that we perceive the different types of rock that exist on the planet, if this process did not happen, the lithosphere would be composed only of magmatic rock.
Why do predictions by the European weather model sometimes differ from predictions made by the American weather model?(1 point)
The two models assimilate data differently using different equations.
The two models use different types of data measurements.
The two models are designed to model different types of weather.
The two models focus on different parts of the world.
Answer:
The two models assimilate data differently using different equations.
Explanation:
The weather models are based on mathematical equations in which the input variables are weather observations such as temperature, pressure, wind, moisture, etc that are obtained from the weather satellites and ground sensors. Using a process known as data assimilation, these weather observations are used to initialize numerical forecast models by combining the observations with prior forecasts.
The two global weather models, the European (European Center for Medium-Range Weather Forecast) and the American (National Weather Service’s Global Forecast System) models provide predictions all over the world. The mesoscale models or fine scale models can predict really small weather observations on more specific regions.
The atmosphere is divided into a three-dimensional grid in each model. At each grid point, the assimilated data is given and the mathematical equations are applied which are then stepped forward in time. The different weather models assimilate data differently using different equations and the outputs obtained over many time steps give the future weather.
Which statement correctly explains what a scientific theory is?
Which state of matter is made up of particles with the greatest amount of
kinetic energy?
OA) gas
OB) solid
OC) liquid
OD) plasma
Answer:
Gas
Explanation:
Gas has the most kinetic energy while a solid has the least
What could happen if the DNA replication process encounters an error while coding
Answer:
Mutation
Explanation:
If an error occurs during the replication, it is called a mutation. Mutations can benefit, have no effect on, or damage the organism. Mutations are permanent once they occur.
Answer:
It can cause a mutation in the replication process/final result. In addition, errors can only be fixed during DNA replication and not transcription or translation, but sometimes they aren't caught.
Carbon atoms can form...
A) one double covalent bond
B) two triple covalent bonds
C) four single covalent bonds
D) three double covalent bonds
Question 7
Explain why it is important for daughter cells to have a full set of chromosomes.
Answer:
It is important for the daughter cells to have a full set of chromosomes so that the chromosome number can be maintained in each cell type of the body of an organism.
If the chromosome number is not same in each cell, then genetic stability will not be achieved by the cells of the body. The chromosome number will not be able to be maintained in the organism's body.
Use this link to explore the niche of a giraffe, then
answer the question provided.
Describe the niche of the giraffe.
DONE
V
Answer:
the niche of the giraffe is to graze.
Explanation:
i said this and got it right on ed
Which of the following correctly provides an example of the hierarchical structure of living organisms?
A.
Organisms that live in the ocean, as opposed to on land, have developed different ways to obtain oxygen.
B.
Human blood cells are specialized to transfer oxygen throughout the body.
C.
The digestive system of animals is made up of organs that work together to break down food.
D.
Reptiles and amphibians have a shared ancestry, so many of their body structures are similar.
A lineage that goes through cladogenesis, or branching evolution, is considered to have a common ancestor if numerous common ancestors, rather than just one, can be found in the lineage. Thus, option D is correct.
What features that includes common ancestry?Compared to amphibians, reptiles are actually more closely linked to birds and mammals. The scales and claws of reptiles are the primary physical distinctions between them and amphibians.
Although they were not the first tetrapods, amphibians did separate from the stock that would later, in a paleontological sense, become the amniotes.
The progenitors of contemporary reptiles and amphibians. Tetrapods are descended from a family of lobe-finned fishes known as the Sarcopterygians.
Therefore, Reptiles and amphibians have a shared ancestry, so many of their body structures are similar.
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What is the function of the structure identified by the red arrow?
O Food capture
O Mobility
DNA transfer
O Protection
Answer:
Protection
Explanation:
It looks like that the picture depicts bacterial cells forming a colony. The structure shown by the red arrow is a cell membrane. The principle function of the cell membrane is to protect the cell internal environment with respect to changes in the external environment. This is also called homeostasis.
For food capturing and mobility, the structure is not matching because there should be filaments or pseudopodia. Likewise, for DNA transfer, pili are required and the shown structure doesn't match that too.
Answer: Answer is D. Protection
Explanation: The arrow is pointing at the cell membrane, the cell membrane controls what is going in and out of the cell, it can also perform as a defensive barrier against things that are not good for the bacteria, therefore it is protection. Have a Good Day :)