Answer:
Each DNA strand within the double helix is a long, linear molecule made of smaller units called nucleotides that form a chain. The chemical backbones of the double helix are made up of sugar and phosphate molecules that are connected by chemical bonds, known as sugar-phosphate backbones.
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Which of the following diseases is always caused by a bacterial infection?
A.
smallpox
B.
leukemia
C.
HIV
D.
diphtheria
Hi!
I would say D, diphtheria, because it is eaisly prevented by a vaccine and it I'd a nose and throat disease.
Hope this helps!
Diphtheria is always caused by a bacterial infection. Therefore, option (D) is correct.
What is Diphtheria?Diphtheria is a serious bacterial infection that affects the respiratory system and can lead to breathing difficulties, heart failure, and even death. It is caused by the bacterium Corynebacterium diphtheriae, which produces a toxin that can damage the body's tissues.
Smallpox (option A) is a viral disease that has been eradicated, and leukemia (option B) is a cancer of the blood and bone marrow that can be caused by various factors, including genetic mutations and environmental factors. HIV (option C) is also caused by a viral infection, specifically the human immunodeficiency virus, which attacks the immune system.
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What is a solution give a example
Answer:
A solution is a homogeneous mixture of two or more substances.
Salt Water
Explanation:
In which type of wave do the particles move perpendicularly to the direction in
which the wave is traveling?
Answer:
Transverse waves
Explanation:
Transverse waves are always characterized by particle motion being perpendicular to wave motion.
The particles move perpendicularly to the direction in which the transverse wave is traveling. The correct option is 2.
What are transverse waves?Transverse waves are those waves in which the oscillations of the waves move perpendicular to the direction of the movement of the wave.
Examples of transverse waves are the rippling of the surface water and the vibration of the guitar.
Thus, the correct option is 2. Transverse waves.
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The options are:
Longitudinal waves.Transverse waves.Both 1 and 2.Neither 1 and 2.Which base sequence in the DNA molecule identifies the region where a transcription factor will bind, allowing RNA polymerase to attach to the molecule?
a. AACCTG
b. TGGA
c. TATATA
d. AGGAT
TATATA base sequence in the DNA molecule identifies the region where a transcription factor will bind, allowing RNA polymerase to attach to the molecule. So, the correct option is C.
What is Transcription factor?A transcription factor is defined as a protein that regulates the rate of transcription of genetic information from DNA to messenger RNA by binding to a specific DNA sequence.
Most of the transcription factors are located in the cytoplasm, after which it receives signals from the cell membrane signal transduction, transcription factors are activated and then move from the cytoplasm to the nucleus where they interact with the associated DNA frames.
The TATATA base sequence in the DNA molecule identifies the region where a transcription factor will bind.
Thus, the correct option is C.
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Final answer:
The TATA box, represented by the sequence c) TATATA, is where transcription factors bind allowing RNA polymerase to initiate transcription.
Explanation:
The region on a DNA molecule where a transcription factor will bind, allowing RNA polymerase to attach to the molecule, is identified by a specific base sequence known as the TATA box. This sequence is typically a repeat of thymine and adenine dinucleotides, represented as TATATA or a slight variant thereof. Transcription factors first bind to the TATA box, which allows for the assembly of an initiation complex. Subsequently, RNA polymerase recognizes this complex and binds to the DNA, initiating transcription.
Sulfur dioxide is released into the air but ends up in lakes and streams as acid rain. Based on your knowledge of the water cycle, explain how this happens.
As water evapo-transpires into the atmosphere from the biosphere and hydrosphere, it cools and condenses. The water droplets in the atmosphere dissolve the sulfur dioxide molecules in the atmosphere forming sulphuric acid;
SO2(g) + H2O(l) --> H2SO3(aq)
The precipitation will, therefore, have a low pH because it is acidic. The runoff from the precipitation end up in rivers and ultimately in lakes.
Answer:
When human beings burn fossil fuels they release, sulfur dioxide, nitrogen oxides into the environment.
Those air pollutants release in the atmosphere reacts with water, oxygen and some other gases to form nitric acid and sulfuric acid.
With the help of wind the substances are spread to hundreds of miles. When the acid rain reaches the earth, it flows through lakes and other ways to enter the water system.
at which step does during protein synthesis does a mutation occur
Answer:
Each codon codes for one amino acid or for a *Protein synthesis is the process in which proteins are made. In the first step, called transcription, the genetic code in DNA is copied by RNA. In the second step, called translation, the genetic code in RNA is read to make a protein.
Explanation:
During protein synthesis, mutations can occur during DNA replication, transcription, or translation at the ribosome. The proofreading function of DNA polymerases minimizes errors during replication, but if the mRNA is transcribed incorrectly or if incorrect translation occurs, mutations can result in alterations to the resultant protein.
The question pertains to the stage at which a mutation can occur during protein synthesis. Mutations are random changes in the sequence of bases in DNA and can be the ultimate source of genetic variation. During protein synthesis, there are several steps where mutations can occur:
During DNA replication, errors can occur when DNA polymerase makes mistakes in copying the DNA. These errors are called mutations and can affect the phenotype if they occur within the protein-coding sequence of a gene. However, this is quite rare due to 'proofreading' abilities of DNA polymerases.Transcription is the process where mRNA is synthesized from DNA. If mRNA polymerase doesn't transcribe DNA correctly, mutations may be introduced at this stage.The second step of protein synthesis, protein translation, occurs at the ribosome. If the ribosome translates the sequence of mRNA incorrectly, or if a substitution results in a premature stop codon, the resulting polypeptide chain can be functionally compromised.Other mutations are induced by environmental factors called mutagens. In some instances, such as with bacteria under stress, mutation rates can significantly increase as a self-defense mechanism.
Look at the food web shown above. Which of the organisms act as producers in the ecosystem
Answer: D. Plants.
Explanation: Because plants do photosynthesis, in which they take sunlight, and turn it into chemical energy, which they use for their daily life activities.
In the given food web , plants acts as a producer.
Plants are producers because they make their own food and out of it creates energy for their survival, reproduction and growth.
What is a Food Web?A food web is an interconnection of food chain in an ecological community.
A food web results into a pathway called feeding pathway where heterotrophs obtain food and energy from autotrophs which makes their own food.
Different kinds of feeding relation can be observed in food web which are:
Herbivory, Carnivory, Scavenging, Parasitism.
The concept was coined by Charles Elton in 1927.
Food Webs are limited representations of real ecosystems and necessarily aggregate many species into trophic species which are functional groups of species having the same predators and prey in the food web.
Ecologists use simplifications in the quantitative models of trophic or consumer resource systems dynamic.
Why Plants performs as Producers?Producers are defined as organisms capable of preparing their own food from simple inorganic substances like carbon dioxide and water using sunlight energy in the presence of chlorophyll.
Green plants are termed as producers as they synthesize their own food using photosynthesis process and thus produces food for themselves and helps to initiate food chain.
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Which sphere is part of the carbon and water cycles but absent form the phosphorus cycle
Answer: Atmosphere
Explanation:
How does temperature affect electrical resistance?
A. As temperature increases, electrical resistance decreases.
B. Temperature and electrical resistance are unrelated.
C. As temperature increases to approximately water’s boiling point, electrical resistance decreases. Beyond this, it increases.
D. As temperature falls, electrical resistance decreases.
Answer:
Temperature affects metal in numerous ways. A higher temperature increases the electrical resistance of a metal, and a lower temperature reduces it. Heated metal undergoes thermal expansion and increases in volume. so the answer is C
Electrical resistance typically increases with increased temperature in conductors due to increased atomic vibrations that cause more electron collisions, thus increasing resistivity. Conversely, in semiconductors, resistance typically decreases with increased temperature.
The correct answer is that electrical resistance generally increases with an increase in temperature for conductors. This is because, as temperature rises, atoms in a conductor vibrate more rapidly and over larger distances. This increased atomic vibration causes more collisions for electrons moving through the material, thereby increasing resistivity. For most conducting metals, this effect results in an increase in resistance with temperature. The relationship can often be modeled linearly for small temperature changes, using a temperature coefficient in the resistivity equation: (ρ = ρο (1 +αΔΤ)), where ρο is the original resistivity, α is the temperature coefficient of resistivity, and ΔΤ is the change in temperature. For semiconductors, however, the situation is different. As temperature increases, their resistivity decreases because thermal agitation increases the number of free charges, making them better conductors at higher temperatures.
How is the density of ocean water affected by temperature and water?
Answer:
There are two main factors that make ocean water more or less dense than about 1027 kg/m3: the temperature of the water and the salinity of the water. Ocean water gets more dense as temperature goes down. So, the colder the water, the more dense it is. Increasing salinity also increases the density of sea water.
Density can be affected by temperature and water in the following way: the warmer the water, the more space it takes up, and the lower its density.
What is density of water?Density is a unique feature of water. Water in a solid state (ice) is less dense than liquid form (water).
The higher the temperature of a water body, the lower the density of the water while the lower the temperature of the water, the higher the density.
Therefore, it can be said that the warmer the water, the more space it takes up, and the lower its density.
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Which describes the function of the human sperm cell’s structure?
A)The nucleus contains all 46 chromosomes.
B)The tail allows it to travel to the egg.
C)The head contains a basic substance that counteracts acidic substances in the vagina.
D)The sperm’s structure allows it to live for two weeks in the vagina.
Answer:
The correct answer is B. The sperm tail helps in propelling and moving the sperm to reach the egg. It is made of proteins which contract and relax to cause the movement. The head and tail however, are covered by a single membrane. Head composes the nucleus.
Answer:
b
Explanation:
why not
What genus are humans in?
A. Homo
B. Sapiens
C. Erectus
D. Sula
The answer is Homo are referred to as Homosapiens
Homo is the genus of humans. thus, option A is the correct option.
What do you mean by binomial nomenclature?The system of naming organisms used in biological taxonomy is known as nomenclature. Two words, the genus and species names, indicate which species the creature belongs to.
The binomial nomenclature of the humans are Homo sapiens.
Homo indicates the species name of the human.
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exposure to 100 R's :
•will have little effect
•can cause radiation sickness
•is enough to kill a person
?
Answer:
Will have little effect
Answer:
Your answer is B. Radiation Sickness.
Explanation:
Look it up on Go.ogle if you don´t believe me.
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what are the two types of eukaryotic cells
Answer:
There are two types of cell, prokaryotic (bacteria) and eukaryotic (animal, plant, fungi and protoctista (unicellular organisms)). Prokaryotes have no nucleolus – the DNA is in the cytoplasm, and it can from small circular strands of DNA called plasmids. Eukaryotic cells all have their DNA enclosed in a nucleus.
Explanation:
Answer:
There are four types of eukaryotes: animals, plants, fungi, and protists. Protists are a group of organisms defined as being eukaryotic but not animals, plants, or fungi; this group includes protozoa, slime molds, and some algae. Protists and fungi are usually unicellular, while animals and plants are multicellular.
Explanation:
25+ POINTS!
Quick question, how do scientists use genetic information? Why is it useful?
Answer:
The new genetic information is useful to public health scientists because it allows them to test for relationships between diseases and genetics. The most common way scientists collect genetic information on a DNA sample is to interrogate a specific point in the genome using a technique we call “genotyping.”
Explanation:
Answer:
The new genetic information is useful to public health scientists because it allows them to test for relationships between diseases and genetics
Which is not used to identify a fossil as a hominin species?
A.body size
B.flatter face
C.upright vertebral column
D.smaller canine teeth
E.bigger brain
E a bigger brain is not a identity a fossil as a hominem species
Tsunamis are _____.
waves that are produced by tidal forces
waves that cannot cause damage on land
often generated by movements of the ocean floor
also known as tidal waves
Answer:
often generated by movements of the ocean floor
Explanation:
The tsunamis are the most devastating waves that occur on our planet. They are enormous and have great power, and once they reach the coastline they continue into the land and destroy pretty much everything on their way. These waves are mostly generated by movements, disturbances on the ocean floor. They occur at places where there's subduction zones. When an adjustment occurs between the crust of the plates, it creates an earthquake. That adjustment of the crust also creates gaps, through which the water is sucked in, and than as the crust continues with the adjusting and shuts the gap, the water is pushed back with lot of force. That creates the tsunamis, enormous, high speed, very powerful waves, that are devastating for everything on their way.
Answer:
option C. often generated by movements of the ocean floor
Explanation:
Malaria is one of the most common parasitic diseases in the world. It is caused by a protist from the genus Plasmodium. How can humans best avoid becoming infected with malaria?
A.
exercise regularly
B.
take medicine that destroys liver cells
C.
always wear long-sleeved shirts
D.
avoid mosquito bites
Hi!
D avoid mosquito bites. Mosquitos are a really nasty and efficient way to spread diseases. In this case, you would probably want a lot of bug spray.
Hope this helps!
Answer:
D = avoid mosquito bites!
Ecosystems change over time—even when they appear to be stable. What is the term for the predictable or orderly sequence of changes experienced by a community?
A.
turnover
B.
ecological succession
C.
eutrophication
Answer:
Ecological succession, I believe.
Answer: ecological succession
Explanation:
I did the study island
What will probably happen to the plant if it does not receive any water for a month?
A.
It will stop growing.
B.
It will continue to grow at the same rate.
C.
It will still grow, but it will turn a darker green.
D.
It will start growing faster.
Reset Submit
Answer: Photosynthesis is the light dependent process which must occur for the plant to live. This process also requires water and carbon dioxide. If photosynthesis does not occur the plant will wilt and die.
Explanation:
Describe two ways in which waves travel, and give an example of each.
Answer:
Basically, sound waves carry noises through the air to our ears. SEISMIC WAVES travel inside the Earth and cause earthquakes. Light, heat, radio, and similar types of energy are carried by a variety of waves in the ELECTROMAGNETIC SPECTRUM. Some energy waves need a medium, such as water or air, through which to travel.
Explanation:
How does water affect metamorphic processes? A. It decreases the rate at which metamorphic reactions take place. B. It stops elements from moving around within earths crust. C. it can have elevated concentrations of dissolved substances. D. It prevents the transfer of ions between and within minerals.
Answer:
it can have elevated concentrations of dissolved substances
Explanation:
Water is widely regarded as a universals solvent. During a metamorphic process, the presence of fluids most especially water cannot be over empahisized.
Water in metamorphic processes helps to concentrate dissolve materials and moves them from one point to another within the crust. By so doing, water helps to facilitate the rate at which the reaction and transformation occurs. Water available for metamorphic processes usually have elevated temperature, this would further aid to catalyse the transformation work on the rock.
Water plays nearly the same role as pressure and temperature in a metamorphic reaction. It serves as the mobile unit to move materials from one point to the to another. The water concentrates the dissolve materials that comes in contact with it and utilizes it to further produce new metamorphic minerals. Generally, fluids allow for better mobility.
Answer:
It can have elevated concentrations of dissolved substances.
What controls a tropism?
A tropism is a turning toward or away from a stimulus in the environment. Growing toward gravity is called geotropism. Plants also exhibit phototropism, or growing toward a light source. This response is controlled by a plant growth hormone called auxin.
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Answer: It is controlled by the sun. It grows like a normal plant does. A plant grows towards the sun.
Explanation: Plants always grow towards the sun unless somehow they die. The sun controls them.
____ are simple sugars
Monosaccharides
Polysaccharide
Disaccharides
Lipids
The correct answer is: Monosaccharides
Explanation: Monosaccharides, also called simple sugars, are the most essential units of carbohydrates. They are basic units of carbohydrates and cannot be additionally hydrolyzed to easier compounds. The general formula is (CH2O)x,
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Scientists observe the thickness of a tree’s _______to learn about past climate conditions
Answer:
Scientists observe the thickness of a tree’s ring's to learn about past climate conditions
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Explanation:
Answer:
tree rings
Explanation:
sample response on edge
what specialized tissue do vasculer plants have that other plants do not
Answer:
You didnt give me and choices so out of the information i have from this answer i can conclude that the answer is out of these 3 Options.
1.) Phyllids 2.) Xylem 3.) Phloem
The specialized tissue that vascular plants have that other plants dont are xylem and phloem. These vascular tissues allow plants to grow without drying out.
Savannas are ____________.
Answer:
Grassland with few trees and shrubs/vegetation
Explanation:
which process can affect the rate of carbon dioxide emissions or other greenhouse gas emissions by changing average temperatures?
Answer:
Greenhouse gas affect
Explanation:
Greenhouse gas
A greenhouse gas (sometimes abbreviated GHG) is a gas in an atmosphere that absorbs and emits radiation within the thermal infrared range. This process is the fundamental cause of the greenhouse effect. The primary greenhouse gases in Earth's atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone
The process that can affect the rate of carbon dioxide emissions or other greenhouse gas emissions by changing average temperatures is called climate feedback and is present in Option A.
What is climate feedback?Climate feedback refers to the process by which changes in one component of the Earth's climate system lead to changes in other components, and there are many examples of climate feedbacks in the Earth's climate system. This includes a warming climate that can lead to the melting of glaciers and ice sheets, which in turn can cause sea levels to rise; another example of climate feedbacks is changes in ocean circulation patterns, which can affect the uptake and release of carbon dioxide.
Hence, the emissions of carbon dioxide or other greenhouse gas emissions caused by changing average temperatures are called "climate feedback" and are present in Option A.
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The question is incomplete, complete question is below
which process can affect the rate of carbon dioxide emissions or other greenhouse gas emissions by changing average temperatures?
A)climate feedback
B)positive loop
11. How does active transport differ from all other forms of transportation?
A. It creates an equilibrium shift
B. It maintains homeostasis
C. It shifts from high to low
D. It requires energy
Though both active transport and passive transport involve ion movement and use ion channels to move ions across the cell membrane, in or out of the cell.
Passive Transport (or Diffusion) moves ions from high concentration to low, using no metabolic energy. Active Transport moves ions from low concentration to high, using metabolic energy in the form of ATP.
So the answer is C.
Answer:
The Answer is D It requires energy
Explanation:
The movement of ions are assisted enzymes which uses energy.
In this lab, you will study the fur color of mice. Image of fur color of mice The color of the fur is the .The genetic combination of alleles that determine the fur color is called the .
Answer:
The Color of the fur is the phenotype
The gentic combination of alleles that determine the fur color is called the genotype
Explanation:
correct on e2020
The correct answer is
The color of a mouse's coat is influenced by the alleles they inherit for the MC1R gene. Mice with two copies of allele 1 have the lightest coat, those with two copies of allele 2 have the darkest coat, and heterozygotes have medium coat color
What do you mean by fur color?
Something is the appearance it has as a result of the way it reflects light. Red, blue and green are colors.An example of fur is a dog thrown on the couch. Fur is defined as the hair on a mammal's body or strips of that material.Learn more about fur color below
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