Adenine and guanine are purines with a two-ring structure, while cytosine and thymine are pyrimidines with a single-ring structure. This difference is crucial for the consistency of DNA's double helix structure.
Explanation:The structure of adenine (A) and guanine (G) differs from the structure of cytosine (C) and thymine (T) in that adenine and guanine are purines, which have a two carbon-nitrogen ring structure. In contrast, cytosine and thymine are pyrimidines, possessing a single carbon-nitrogen ring structure.
The combination of a purine with a pyrimidine allows DNA to maintain a consistent structural shape, as a two-ring purine pairs with a one-ring pyrimidine, keeping the strands of the DNA helix an equal distance apart.
What if a mutation occurred in the human insulin gene and the first codon was changed to CCG? Is
this a silent mutation? Explain how you know.
Yes, this will be a silent mutation.
Explanation:
The mutation which occurred in the human insulin gene where the first codon was changed to CCG will be a silent codon because this will not change the sequence of the amino acid and the amino acids formed will remain the same.
A silent mutation occurs due to base substitutions resulting in a change in the nucleotide that does not impact the amino acid or protein formed once the mRNA is translated. The protein will retains its functional aspects.
The point mutation occurs in only one base. Silent mutations are point mutations that code for the same amino acid as the original codon. In the exposed example, it is a silent mutation.
-----------------------
The mutation would still code for the same amino acid, meaning that it is a silent mutation.
When a change occurs in a single base pair, it is known as a point mutation.
Points mutations might be either silent, missense, or nonsense.
In silent mutations, the resulting mRNA codon codes for the same amino acid as the unmutated sequence. However, if the mutation causes the mRNA codon to code for a different amino acid, this mutation is a missense mutation. Finally, if the mutation causes mRNA codon to be a stop codon, we are referring to a nonsense mutation.In this example, the mutation is a point mutation, and the mutated base causes no change in the amino acid codification. So the protein remains the same.
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What can scientists accomplish by applying recombinant-DNA technology?
Answer:
- production of vaccine for disease prevention
- production of genetically modified crops
Explanation:
Recombinant DNA is a special type of DNA that has been infused with a foreign gene of particular interest.
With recombinant DNA technology, scientists can study different proteins and see how they can be used for therapy in the area of medicine. The technology has been used to produce several vaccine in the prevention of diseases.
In addition, recombinant DNA technology has been useful in agriculture to produce genetically modified crops with desired traits such as resistance to pests/diseases and high yields.
Answer:
It is used to identify, map and derive the gene sequence and determine its function.
It is used to analyze gene expression in individuals' cells, and through the tissues of whole organisms. Recombinant proteins are widely used as reagents in laboratory experiments and to generate investigations to examine protein synthesis within organism cells.
It allows the possibility of using genetically modified microorganisms to produce drugs or other products of utility for man, among which can be mention: human insulin, growth hormone, interferons, obtaining new vaccines against hepatitis B5 and the vaccine against the human papilloma virus.
It has been possible to obtain transgenic plants resistant to insects, fungi, bacteria and herbicides, with better quality characteristics during post-harvest and with high nutritional content.
It has allowed the cloning.
Young Adulthood spans the ages of: HELP ASAP
Question 1 options:
18-35
20-40
35-40
Answer:
18-35
Explanation:
There are 2000 Hydrilla individuals per square kilometer in a certain area of a body of
water. With this information you can determine a population's density.
O
A. True
O
B. False
Answer:true
Explanation:
Final answer:
The statement that there are 2000 Hydrilla individuals per square kilometer is true for determining population density.
Explanation:
The statement that there are 2000 Hydrilla individuals per square kilometer in a certain body of water allows us to determine a population's density. This is true, as population density is defined as the number of individuals per unit area. Different methods, such as life tables, mark and recapture, and quadrat sampling, can be used to estimate population size and density. In this scenario, the individual count of Hydrilla is given, and no further calculations are necessary to determine the population density, which is 2000 individuals per square kilometer.
Two squirrel populations are said to have very little gene flow. What will most likely
happen to these populations?
a
The populations will evolve separately from each other.
b
The populations will evolve at the same rate.
c
Both populations will develop the same ratio of alleles.
d
There will be an increase in diversity within both populations.
Answer:
The correct answer is option a. "The populations will evolve separately from each other".
Explanation:
Two squirrel populations that have very little gene flow will not share their genetic adaptations to survive the changing environmental conditions that they can face. Therefore, it is very likely that the two populations will evolve separately from each other. This contrasts with species that evolve collectively since they share their genetic adaptions due to a high gene flow among them.
What are food webs and food chains dependent on?
Answer:
a complex series of feeding relationships with many organisms interacting and depending on each other
Explanation:
An autopsy report for a deceased individual lists natural causes as the manner of death. Which is the most likely cause of death?
asphyxia
heart attack
blunt force trauma
sharp force trauma
Final answer:
The most likely cause of death listed under natural causes in an autopsy report is a heart attack. Heart attacks, or myocardial infarctions, occur due to the obstruction of blood flow in the coronary arteries, leading to the death of heart tissue.
Explanation:
When an autopsy report states that an individual died of natural causes, it usually refers to health issues that arise from within the body, not caused by external factors. In this context, the most likely cause of death would be a heart attack, which is the blockage of blood flow to heart muscle tissues potentially resulting in the death of cardiac muscle fibers.
Heart attacks fall under the category of coronary artery disease, which is the leading cause of death worldwide. This condition, called myocardial infarction, occurs when the buildup of plaque in the arteries obstructs blood flow, causing ischemia and subsequent death of cardiac tissues. In contrast, asphyxia, blunt force trauma, and sharp force trauma are typically considered unnatural causes of death and often result from external factors such as accidents, injuries, or violence, which do not align with the classification of natural causes.
Which of the following processes would have the quickest impact on the shape of beaches?
Answer:
I don't know the options but my best guess would be erosion. Every time water comes on the beach is takes sand which erodes the beach. Hope that helps!
WILL MARK BRAINLIEST!!!
Which are present when freezing rain occurs? SELECT TWO OPTIONS!!!
A. ice pellets
B. snowflakes
C. cold surfaces
D. liquid precipitation
E. warm temperatures
Answer: A and C
Explanation: Ice pellets fall from the sky and stick to cold surfaces
Ribosomes are the site where
are produced.
Answer:
Ribosomes are a cell structure, it makes protein
Answer:
Ribosomes are the site where polypeptide chains are produced through protein synthesis.
What three things most directly affect carrying capacity?
O
A. Water, money, and technology
O
B. Wood, electricity, and water
O
O
c. Money, medicine, and food
D. Food, space, and water
SUBI
Answer:
D
Explanation:
these are all needs for basic life
Name whether these are examples of weathering, Erosion
A river flowing
Rain dissolving rock
Glacier crushing rock
A mudslide
A sinkhole
A sandstorm
Answer:1-erosion
2- weathering
3- weathering
4-erosiom
5erosion
6erosion
Hope this helped! :)
Explanation:
Answer:
Weathering Erosion WeatheringErosionErosionErosionExplanation:
which of the following images shows a transition from the biosphere to the geosphere?
Answer:
Image D
Explanation:
Marine plants and algae are a part of the biosphere while sediment is part of the Earth and the geosphere.
A transition from the biosphere to the geosphere is represented in the - D. image D.
The biosphere:
is one of the zones of the earth or the ecosystem that include all the living organisms present in the earth.It also includes all organisms that live in or on marine, air, and land.In this sphere living beings interact with one anotherThe Lithosphere or geosphere:
It is the outer rigid part of the earth that includes the upper portion of the mantle, crust, and outer part of the earth.It makes up to 60% of the earthIt is also called the geosphere.Interaction between both:
The geosphere provides water, and nutrients from soil and hydrosphere to the plants to the biosphere.after the death of the living organisms, they bury them in the soil that leads to the formation of sediments.Thus, A transition from the biosphere to the geosphere is represented in the - D. image D.
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A gardener crosses a true-breeding tall tomato plant bearing red fruit with a true-breeding dwarf tomato plant with yellow fruit. In tomatoes, tall vine (T) is dominant to dwarf vine (t) and red fruit (R) is dominant to yellow fruit (r).
Predict the phenotypes and genotypes of the F1 generation.
Cross of true breeding dominant and recessive tomato plants will have:
Phenotype ratio in F1 generation is 4:0
genotype ratio in F1 generation is 4:0.
Explanation:
Data given:
Tall vine = dominant TT
dwarf vine = recessive tt
red fruit dominant RR
yellow fruit recessive rr
true breeding tall tomato plant bearing red fruit is TTRR
true breeding dwarf tomato plant bearing yellow fruit = ttrr
the cross is shown in punnet square:
TR TR
tr TtRr TtRr
tr TtRr TtRr
the phenotype ratio- 4:0
the genotype ratio - 4:0
The phenotype is tall vine with red fruit
Genotype is all the progeny are heterozygous dominant.
Answer:
9 tall vine/red fruit; 3 tall vine/yellow fruit; 3 dwarf vine/red fruit; 1 dwarf vine/yellow fruit (9:3:3:1)
Explanation:
I just took this test
discuss the impact of the extinction of grasshopper in the ecosystem?
what is the energy in electron- volts (eV) of a photon of green light that has a wavelength of 520nm? (1.0 m = 1.0 x 10^-9m)
a. 3.8 x 10^-19eV
b. 3.4 x 10^-40 eV
c. 2.4eV
d. 2.2 x 10^-21 eV
Answer: c not sure tho
Explanation:
genomic imprinting does not actually involve a change in the genetic sequence of an inherited gene
true or false
Answer:
It should be true! :)
Explanation:
Genomic imprinting is a true epigenetic process that alters gene expression without changing the genetic sequence, often by adding methyl groups to DNA. It results in the selective expression of alleles based on parental origin and is reset in gametes.
The statement that genomic imprinting does not actually involve a change in the genetic sequence of an inherited gene is true. Genomic imprinting is an epigenetic process where the expression of genes is altered without modifying the DNA sequence. This process entails the addition of methyl groups to certain DNA bases, which affects how genes are expressed depending on whether the allele was inherited from the male or female parent. In most cases, this results in the silencing of one parent's allele, allowing only the other parent's allele to be expressed. Imprinted genes can vary in their effect, with some influencing growth and development.
Despite both sons and daughters receiving this epigenetic information, it is erased before the next generation of gametes (sperm or eggs) are formed, ensuring that each individual can reset the epigenetic marks according to their own gender and pass on their own unique pattern of imprinting. The phenomenon of imprinting demonstrates that not all inherited traits are strictly encoded in the gene's nucleotide sequence; some inheritable information is epigenetic.
Predict how each environmental condition—normal, windy, warm, and humid—might
affect the rate of plant transpiration. Rank the conditions from the lowest rate to the
highest rate, with number 1 being the lowest and number 4 being the highest.
Answer:
1) Normal
2) Warm
3) Windy
4) Humid
The narrowest taxon in the Linnaean system is the genus, order, or species
Answer:
species.
Explanation:
Species < Genus < Family < Order < Class < Phylum < Kingdom
All cells of the body originate from one cell called the zygote. This cell will give rise to all the cells of the body. Based on your knowledge of mitosis and cell differentiation, which of the following statements must be true?
A. All the cells of the body have different parts of the DNA from the original cell.
B. All the cells of the body have the same DNA, but use different parts of it.
C. All the cells of the body are exactly the same as the original zygote cell.
D. All the cells of the body have pieces of the original cell’s organelles
Answer:
B
Explanation:
Different cells use different parts of the DNA strand to perform their functions
Answer: B
Explanation: How does a complex organism such as a human develop from a single cell—a fertilized egg—into the vast array of cell types such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, the process of cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions. All the cells of the body have the same DNA, but use different parts of it.
These parallel scratches were most likely caused by
Ocean waves
Running water
Wind
Or Glacier ice
Answer:
Glacier ice
Explanation:
It looks like it has scratches that came from ice.
Scientists have applied the methods of science inquiry and engineering design to develop many new organisms that do not exist in nature,
such as fluorescent zebra fish
Consider the following questions about fluorescent zebra fish. Applying the methods of science and engineering is NOT sufficient for
answering which of the questions?
A
Can the same process used to develop fluorescent zebra fish be applied to other organisms?
B. Does the purpose of the fluorescent zebra fish affect whether their development was morally acceptable?
C. How could fluorescent zebra fish be used to detect pollutants in the water?
D. Apart from their ability to emit light, how do fluorescent zebra fish differ from other zebra fish?
Answer:
B. Does the purpose of the fluorescent zebra fish affect wether their development was morally acceptable?
Explanation:
It’s correct because I got it right
Applying the methods of science and engineering is not sufficient for answering the question which is as follows:
Does the purpose of the fluorescent zebra fish affect whether their development was morally acceptable?Thus, the correct option for this question is B.
What is Fluorescent zebrafish?Fluorescent zebrafish may be defined as a type of fish that emit certain types of coloration. They come in a variety of fluorescent colors such as red, pink, orange, green, blue, and purple. These colors a called Starfire Red, Electric Green, Sunburst Orange, Cosmic Blue, Galactic Purple, and Moonrise Pink.
These fishes endowed them with genes from fluorescent jellyfish (for blue and green colors) and coral (for red). They inserted the gene into a zebrafish embryo, allowing it to integrate into the zebrafish's genome, which caused the fish to be brightly fluorescent under both natural white light and ultraviolet light.
All the given questions were significantly answered except for the purpose of the fluorescent zebra fish effect and whether their development was morally acceptable. Thus, the correct option for this question is B.
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Which phrase describes members of the domain Eukarya, but does not describe any members of Bacteria or Archaea?
are multicellular
are unicellular
have cell walls
have a cell membrane
Answer:
They are multicellular
Explanation:
did the test
So sorry for being late ;/
Answer:
multicellular
Explanation:
took a test it as correct make me brainlyist answer please
Which of the following planets has very little atmosphere?
Answer:Mars, has a thin atmosphere composed of about 95 percent carbon dioxide
Explanation:The leading theory is that Mars' light gravity, coupled with its lack of global magnetic field, left the atmosphere vulnerable to pressure from the solar wind, the constant stream of particles coming from the sun.
Answer:
Explanation:
Mercury’s atmosphere containing oxygen (42%), sodium (29%), hydrogen (22%), helium
(6%), potassium (0.5%) and water vapor.
2. Venus
The atmosphere of Venus is one of the most chemically complex and dynamically active
planetary atmosphere in the solar system. The Venusian atmosphere consist of carbon
dioxide (95.5%), nitrogen (3.5%), sulfur dioxide (0.015%), argon (0.007%), carbon monoxide
(0.002%), helium (0.001%), neon (0.001%).
3. The Earth
The atmosphere of Earth is mainly composed of nitrogen (78.08%) and oxygen (20.95%).
The remaining part of the atmosphere divided into the permanent and the variable
constituents. The permanent constituents consist of the five noble gases, argon, neon,
helium, krypton and xenon also other materials such as carbon dioxide, hydrogen, methane,
nitrous oxide and radon. The variable constituents of the atmosphere are water, carbon
monoxide and ozone.
The central vacuole of a plant cell is damaged.
What function is most affected by the damage?
Answer: Storage of Water
Explanation:
The carbon cycle is a cycle among the carbon reservoirs.What is a carbon reservoir and what are some examples?
Answer:
Explanation:
The reservoirs are the atmosphere, the terrestrial biosphere (which usually includes freshwater systems and non-living organic material, such as soil carbon), the oceans (which includes dissolved inorganic carbon and living and non-living marine biota), and the sediments (which includes fossil fuels)
A carbon reservoir is a location or a natural process that stores or releases carbon. The carbon cycle describes the movement of carbon between these reservoirs over time.
What is carbon cycle?The carbon cycle is the exchange of carbon between the Earth's atmosphere, land, ocean, and living organisms.
Carbon can be stored in a variety of reservoirs, such as:
The atmosphere is the world's largest carbon reservoir, containing carbon in the form of carbon dioxide (CO2).
The ocean is a major carbon reservoir because marine organisms use dissolved CO2 in the water during photosynthesis.
Soil: Because it contains organic matter from dead plant and animal material, soil is a significant carbon reservoir.
Fossil fuels: Carbon reservoirs such as coal, oil, and natural gas formed over millions of years from the remains of dead organisms.
Thus, these are the carbon reservoirs.
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Which of the following is one stage of the cell cycle?
Cytoplasm
Cellular respiration
Interphase
Photosynthesis
Answer:
If it is a plant cell it will be photosynthesis. but if it is a animal cell it will be cellular respiration.
Explanation:
If it were up to me i would choose cellular respriation because plant and animals cells both go through it though photosynthesis is the main stage of a plant cell.
Hope this helps
Interphase is stage of the cell cycle.
What is interphase ?
Interphase is the longest phase of the cell cycle which show three sub phases and one checkpoint at each stage.
G₁ phase the cell size increases and becomes double, the raw material for DNA synthesis occur like mRNA and proteins
S phase where the replication of DNA takes place and amount of DNA become double, evenly distributed between daughter cells.
G₂ phase where the cell continues to grow and synthesize proteins. cell prepare itself to move in mitotic phase so it can divide.
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Which of the following results from cutting down trees?
A. Reduced fish populations
B. Increased cooling
C. Reduced sediment flow
D. Increased erosion
Answer:
D
Explanation:
vegetation on soil protects the soil from erosion because its root hair help bind the soil particles together.
The following results from cutting down trees is Increased erosion.
What are the consequences of deforestation?Consequences of deforestation
Habitat degradation: the removal of vegetation destroys the habitat of several species, which can even lead them to extinction.Erosion: the removal of vegetation also leaves the soil more exposed to the action of the sun, wind and rain, which can trigger its degradation process.The main consequence of deforestation is linked to the environmental imbalance caused by the loss of native vegetation. The removal of vegetation causes a great loss of biodiversity as well as the loss of habitat for animals and plants, and also directly impacts the increase in the number of endangered species.
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Which of the following explains when a recessive gene is passed on?
when a genetic mutation occurs
when the trait is in its second generation
when the father exhibits the recessiv
when both parents possess the recessive allele
Answer:
D) "when both parents possess the recessive allele"
Explanation:
Climate models try to incorporate all the factors that impact Earth's global temperature as variables within the model.
A-True
B-False
Answer:A-true
Explanation:The answer is true because activities on earth influences the climate.