Answer:
Natural selection occurs when some of those traits help some individuals survive and reproduce more than others. That causes their genes to become more common in the population over time, and it's the way species evolve to adapt to changes in their environment.
Explanation:
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What is gel electrophoresis used for?
O A. Cutting DNA into sections
O B. Separating strands of DNA
O C. Performing reverse transcription
O D. Cloning organisms
Answer:
B. separating strands of DNA
Gel electrophoresis used for separating strands of DNA
What is electrophoresis?Electrophoresis can be defined as a technique used to separate molecules of DNA, RNA or protein molecules on the basis of their electrical charge and size
It also used to identify microorganismsIt is also used in genetic testingElectrophoresis analysis is used in forensics to compare DNA,Below are four major components of gel electrophoresis:
DNA is extractedIsolation and amplification of DNADNA added to the gel wellsElectric current applied to the gel.Learn more about gel electrophoresis:
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why are there no small organisms in the bathyal zone?
I will give 50 extra points if you are correct!!
Answer:
There are no known organisms because of the lack of sunlight necessary for photosynthesis to produce these organisms
Explanation:
The bathyal zone is less densely populated. Sunlight does not reach this zone, meaning primary production, if any, is almost nonexistent
The compass has advanced dramatically over the years, evolving into a
Global Positioning System (GPS). The GPS is a device that is simple to use
and gives a lot of information on your position.
Which is a positive effect of the technological advance of going from a
compass to a GPS?
O A. The GPS uses less electricity.
B. The GPS gives more accurate information
O C. The GPS is less expensive,
D. The GPS is easier to manufacture,
Answer: B
Explanation:
The GPS gives more accurate information .
What is GPS?The Global Positioning System (GPS) is a U.S.-owned utility that provides users with positioning, navigation, and timing (PNT) services.
What are the 3 types of GPS?Three types of GPS systems are:
Street navigation systemsSports GPS systems Phones with GPSHence, A is correct option
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Pleaseee help me out.
The T allele codes for tall stems in pea plants and the t allele codes for short stems. If T is
dominant and t recessive, what percentage of the offspring would you expect to have each
phenotype from a cross of Tt x tt?
a. 75**
tall and 25% short
b. 25% tall and 75% short
C. 50% tall and 50% short
d. 25% tall and 25% short
Answer:
50% tall and 50% short.
Explanation:
T t
t Tt tt
t Tt tt
explain how urine is formed in our body
Answer:
Urine is a liquid by-product of metabolism in humans and in many other animals. After the filtration of blood by kidneys, urine is produced. It is them passed through the ureters to the bladder to store it. While urinating, the urine is passed from the bladder through the urethra to discharge it.
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The plants in the were allowed to self-pollinate.
Answer:
here's is your answer buddy
Explanation:
The plants in the F1 generation were allowed to self-pollinate. The plants in the P generation are true breeding.
Answer:
dentifying the Generation For each of the following statements, indicate whether the statement describes the P generation, F1 generation, or F2 generation.
The plants in the F1 generation were allowed to self-pollinate.
The plants in the P generation are true breeding.
After a cross, there are three times as many tall plants as there are short plants in the F2 generation.
Explanation:
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Why KOH solution is kept in the test tube inside the air tight conical flask while doing the experiment of respiration of seeds?
Answer:
It is kept inside to absorb the CO2 released by the germinating seeds.
Explanation:
It means it will create a cycle for the flask. So, an equal volume of water rises up in the tube.
Hope it helps.
Hummingbirds drink nectar from flowers. As they pass from flower to flower,
the hummingbirds carry pollen, aiding in pollination. What kind of relationship
exists between the hummingbirds and the flowering plants?
A. Commensalism
B. Predation
C. Mutualism
D. Parasitism
explain the role microbiologist play in researching and treating the disease
Answer:
Microbiologists are essential in helping us to treat diseases. Many work as biomedical scientists in hospitals and laboratories: testing samples of body tissue, blood and fluids to diagnose infections, monitor treatments or track disease outbreaks.
in the term 2pq of the Hardy-Weinberg equation. Why is the multiplication by two necessary?
PLEASE HELP ME!!!!!
A-The term is multiplied by two because the effect of both the alleles is taken into account.
B-There are two ways that a heterozygous individual can arise: either by receiving a recessive allele from the egg and a dominant allele from the sperm, or by receiving a dominant allele from the egg and a recessive allele from the sperm
C-The frequency of the dominant allele is doubled because of its stronger effect on the phenotype.
D-The term is multiplied by tvo to account for doubling of the population in each generation.
Answer:
The correct answer is : option B.
Explanation:
Hardy–Weinberg equilibrium is a mathematical model that states that genotype percentage or frequency in a population and allele in a population remains stable or constant to generations if there are no evolutionary influences present.
Hardy Weinberg equation is :
P²+2pq+q² = 1
Here, p² represents the frequency of genotypes dominant homozygotes (AA) in a population in equilibrium. The term 2pq represents the frequency of heterozygotes (Aa) as there are two ways of developing heterozygous individuals either dominant from the egg and recessive from sperm or vice versa. and the term q² represents the frequency of recessive homozygotes (aa).
Thus, the correct answer is : option B.
There are two ways that a heterozygous individual can arise: either by receiving a recessive allele from the egg and a dominant allele from the sperm, or by receiving a dominant allele from the egg and a recessive allele from the sperm, the frequency of the heterozygous allele is multiplied by 2 (option B).
The Hardy–Weinberg equation is an equation which expresses the principle of Hardy-Weinberg equilibrium. The Hardy-Weinberg equilibrium states that in the absence of external evolutionary factors which disturbs equilibrium, the amount of genetic variation in a population will remain constant from one generation to the next.
The Hardy Weinberg equation is given as: p² + 2pq + q² = 1
In the equation above,
p² represents the frequency of dominant h0m0zygotes (AA)q²represents the frequency of recessive h0m0zygotes (aa),2pq represents the frequency of heterozygotes (Aa),p represents the allele frequency of the allele A and q represents the allele frequency of the allele a.The sum of all the three frequencies equal to 1 representing all the possible allele combinations.Since there are two ways that a heterozygous individual can arise: either by receiving a recessive allele from the egg and a dominant allele from the sperm, or by receiving a dominant allele from the egg and a recessive allele from the sperm, the frequency of the heterozygous allele is multiplied by 2.
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Are enzymes in saliva a example of a structural adaption or physiological?
Answer:
structural adaptation
Answer:
Adaptational
Explanation:
It needs to adapt to the different variety of food and drinks.
i am generally found both inside and outside of the nucleus {in eukaryotic cells} is it DNA O RNA ?
Answer: RNA
Explanation:
Nearly all the RNA found in a typical eukaryotic cell is rRNA. Transfer-messenger RNA (tmRNA) is found in many bacteria and plastids.
What is generally found both inside and outside of the nucleus of a eukaryotic cell is ; RNA
RNA is formed in eukaryotic cells when DNA contained in the nucleus of the cell is transcribed/synthesized. The transcribed RNA is then moved out of the nucleus into the cytoplasm.
The RNA contained in the cytoplasm is later transcribed into protein in the cytoplasm of the cells . therefore RNA is contained both inside and outside the nucleus of a eukaryotic cell.
Hence we can conclude that what is generally found inside and outside the nucleus of a eukaryotic cell is RNA
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How does the flu affect businesses and governments? Could it affect residents’ access to certain resources?
Answer:
Ofcourse it does
Explanation:
Imagine one person have flu and he or she goes to met someone who is healthy but when they talk other infected person's flu goes to other healthy person and that new infected person goes to another and they go to another and thats how it seperate. But we have solution for this the first infected person need to wear mask so that his or her flu don't pass out to anothers.
Why are human populations not limited by the carrying capacity of their ecosystems?
Answer:
humans use their knowledge to locate resources.
Explanation:
The carrying capacity can be defined as the maximum number of individuals in a population of a species that an ecosystem or region can support on the basis of availability of water, food, habitat and other needs necessary for survival. Sometimes, the population of the species increases exponentially exceeding the carrying capacity of an ecosystem when the resources available are surplus.
The human populations are not limited by the carrying capacity of their ecosystem this is because of the fact human beings possess special intellectual and thinking abilities which make them capable of availing themselves resources. They posses knowledge which allows them to search, and find resources even from the earth extreme locations not suitable for survival.
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Describe the factors that impact the ability for a skeletal muscle fiber to reach tetany. How do these factors influence the difference in twitch force as the muscle moves from a single twitch to a state of tetanus?
Answer:
Tetanus is a very aggressive disease generated by clostridium tetani, this clostridium, which is a bactera, releases a toxin that generates tetanization of the muscle, where it contracts massively and simultaneously, remaining over time, similar to a contracture and very different from synchronized and sporadic contraction that requires locomotion or other physiological contractions.
The Tetanus toxin acts as a toxin for the muscle cells that make up the skeletal muscle fiber, which unfortunately leads to the progressive death of the patient who suffers from it.
In simple words, tetanus generates muscle spasms that are maintained over time, preventing the function of the organ, that is, of the muscles, immobilizing them and prohibiting them from other movements.
Patients who reach the target are affected by the diaphragm that contributes to respiration, therefore many of the tetanized patients die in a similar way to suffocation due to a constant spasm of the diaphragm.
Explanation:
The bacterium is found in sporulated form on the ground or on oxidized surfaces, that is why it is important to sterilize oxidized elements or to decontaminate them, and to apply the antithetical vaccine, which is what prevents them from suffering from said pathology.
In simple words, the great differences between a physiological contraction of muscle fibers and tetanized contractions is the time in which they occur, since tetanization lasts over time and physiological does not, and the power of contraction in tetanization is greater. , since the toxin of said bacterium potentiates the ionic channels thus generating an increase in the contractile capacity of the muscle fiber compared to the physiological or health situation.
In order for the toxin to have an effect, the bacteria must leave its sporulated state, release the toxin and the wound must be deep enough for the bacteria to enter the bloodstream, after which the toxin enters the myocytes that are muscle fiber cells intensifying muscle spasms by opening calcium channels in a longer period of time, calcium channels are those found in the REL of myocytes, which act as a reserve for this ion, triggering so that the Z lines of the sarcomeros definitively approach spasmodically by shortening the length of the sarcomero.
A colorimeter is an instrument used for chemical analysis by comparing a liquid’s color with standard colors. In an experiment, a scientist used two colorimeters and noted the readings. The first colorimeter showed consistent readings that were five points lower than the actual reading. The second colorimeter provided readings that were the same as the actual reading. Which two statements are implications of these readings?
1). The first colorimeter is reliable but not valid.
2). The second colorimeter is valid and reliable.
3). Both the colorimeters are reliable and valid.
4). The readings of the first colorimeter can be used without repeating the experiment.
5). The readings of the second colorimeter aren’t reliable and can’t be used for the experiment.
Answer:
The correct answers are option A and B
Explanation:
The first colorimeter is reliable because the the reading it is showing is same for all the times the experiment is done. Though the result obtained is wrong but it is reliable.
The second colorimeter is valid and reliable because it is showing the correct results again and again. This is valid result as it is giving the result same as that of actual readings.
A researcher investigates a recently discovered species of plant. The plant has vascular tissues and exhibits a sporophyte and a gametophyte
generation, but lacks seeds. How should the researcher classify the plant?
Answer;
pteridophyte
Explanation;
Pteridophyte are vascular plants in the phylum plants that reproduce by releasing spores rather than seeds.Other characteristics of pteridophyte includes;
They show alternation of generations, that is the sporophyte generation and gametophyte generation are observed.Sporophytes has true roots, stem and leavesSporangia are produced in groups on sporophyllsIf the chromosomes line up
differently, how will this
affect the gametes formed?
A medical test indicates that a patient has a defective protein. This
condition is most likely due to a change in the directions coded in the:
number of phosphate molecules
sequence of subunits in DNA
number of nitrogen bases
sequence of sugar molecules
Answer:
number of nitrogen bases
Explanation:
The correct answer would be the number of nitrogen bases.
A defective protein is usually caused by mutation, which is defined a change in the DNA sequence of an organism.
Mutation can occur in a variety of ways including:
1. Deletion of nucleotide base sequence in the DNA
2. Addition (insertion) of nucleotide base sequence in the DNA
3. Duplication of nucleotide sequence in the DNA
A change in number of phosphate molecules, sequence of subunits DNA and sequence of sugar molecules if possible in nature, do not lead to mutation if the change does not affect the sequence of DNA.
Hence, the correct option is number of nitrogen bases.
DNA: TTA CGC AAC TGG CTA ATT
mRNA: AAU GCG UGA CCG AUU AAC
Identify the type of mutation that occurred in the sequence above and evaluate the significance of these changes. (Will it have any problems in protein synthesis?)
Hint: 1st determine if it was copied to mRNA correctly. When you find the error, that is the mutation. 2nd use the chart if a different amino acid is created, this will determine if it will affect protein synthesis.
Answer:
See the answer below.
Explanation:
The correct mRNA sequence from the DNA according to the base pairing rule should be:
AAU GCG UUG ACC GAU UAA
Instead of:
AAU GCG UGA CCG AUU AAC
This thus means that some of the nucleotide bases have been wrongly substituted.
The most important change is the codon 'UUG' becoming 'UGA', while the former codes for the amino acid leucine, the latter represents a stop codon. A stop codon will result in a non-functional or defective protein.
Hence, the type of mutation is nonsense mutation which results in a sudden cessation of protein synthesis as a result of a codon being prematurely changed to a stop codon.
The significance of this kind of mutation is that a defective on non-functional protein will result which will have a serious phenotypic implication in organisms.
what causes ocean tides to reach higher up on a shore at certain of day than at others?
Answer:
Most tides are semidiurnal, which means they take place twice a day. For example, when an area covered by the ocean faces the moon, the moon's gravitational force on the water causes a high high tide. As the Earth rotates, that area moves away from the moon's influence and the tide ebbs.
Explanation:
Answer:
D. The moons gravity and Earth’s rotation
Explanation:
why do you think silk is valuable fibre?
Answer:
Silk is used to make clothes
Explanation:
What function do most of the stem cells in adults serve?
A. Differentiating into any type of cell
B. Repairing damaged DNA
C. Replacing damaged tissue
D. Growing new organs
Question 11 (1 point)
Which of the following is not the name of a taxon?
Order
O Family
O Class
O Association
Match each step of the scientific method with its description.
construct a hypothesis
communicate the results
test the hypothesis
make observations
analyze the results and
make a conclusion
ask questions
Bread, when kept in the open for a
long time shows the presence of mold.
arrowRight
What causes mold growth on bread?
arrowRight
Changes in temperature may affect
the growth of mold on bread.
arrowRight
Keep the bread in different locations,
changing the temperature at each location.
arrowRight
Increased temperature leads to the
growth of mold.
arrowRight
Make a presentation of the data, and
explain it to the class.
arrowRight
Answer:
I have put the question like this ;
Tiles
1. construct a hypothesis
2. communicate the results
3. test the hypothesis
4. make observations
5. analyze the results and
make a conclusion
6. ask questions
Pairs
A. Bread, when kept in the open for a
long time, shows the presence of mold.
B. What causes mold growth on bread?
C. Changes in temperature may affect
the growth of mold on bread.
D. Keep the bread in different locations,
changing the temperature at each location.
E. Increased temperature leads to the
growth of mold.
F. Make a presentation of the data, and
explain it to the class.
Explanation:
ANSWERS :1- C ( this is an assumption; a hypothesis is always based on an assumption.
2- F ( this states to share the results with other classmates).
3- D (this is a description of an experiment you could conduct; you test a hypothesis (usually) by conducting an experiment.
4- A (this is something you could observe during the experiment, therefore it is an observation).
5- E (this sentence is a conclusion).
6- B (This is an actual question)
Sheila weighs 60 kg and is riding a bike. Her momentum on the bike is 340 kg • m/s. The bike hits a rock, which stops it completely and throws Sheila forward onto the pavement. If there is no net force on the system, what is Sheila’s velocity immediately after she is thrown from the bike?
Answer:
5.7 m/s
Explanation:
The computation of Sheila 's velocity right after she gets thrown out of the bike is shown below:
1) The Physical principle: conservation of momentum.
If there is no net external force operating on a system, so the system's total momentum is conserved
The momentum, p, is a vector magnitude that is determined as the product of the mass by the velocity:
P = mv.
2) Taking into account therefore that there is no net force on the device, Sheila and the momentum of the bike are the identical pre and post collision.
Based on this, the calculation is as follows
Momentum before the collision:
[tex]P_1 = (mass\ of\ Sheila + mass\ of\ the\ bike) \times velocity[/tex]
[tex]P_1 = (60kg + m) \times v_1[/tex]
= 340 kg m/s
Now Momentum after the collision:
[tex]P_2 = mass\ of\ sheila \times velocity\ of\ Sheila + mass\ of\ the\ bike \times velocity\ of\ the\ bike[/tex]
[tex]P_2 = 60kg \times v_2 + m \times 0 = 60kg \times v_2[/tex]
[tex]P_1 = P_2[/tex]
[tex]= (60kg + m) \times v_1[/tex]
[tex]= 60kg \times v_2[/tex]
[tex]= 340 kg .\ m/s[/tex]
[tex]= 60kg \times v_2[/tex]
[tex]v_2 = \frac{340\ kg .\ m/s }{60\ kg}[/tex]
= 5.7 m/s
The velocity of Sheila immediately after she is thrown from the bike is 5.67 m/s.
The given parameters;
mass of Sheila, m = 60 kgmomentum of Sheila, P = 340 kg.m/sThe velocity of Sheila immediately after she is thrown from the bike is calculated as follows;
P = mv
where;
v is the velocity Sheila
[tex]v = \frac{P}{m} \\\\v = \frac{340}{60} \\\\v = 5.67 \ m/s[/tex]
Thus, the velocity of Sheila immediately after she is thrown from the bike is 5.67 m/s.
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What is the atom structure?
Answer:
The nucleus (center) of the atom contains the protons (positively charged) and the neutrons (no charge). The outermost regions of the atom are called electron shells and contain the electrons (negatively charged). Atoms have different properties based on the arrangement and number of their basic particles.
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Explanation:
Fill in the blanks with the correct word or phrase.
The process of change in a population over time is called
.
The process by which organisms that are better adapted to the environment survive and reproduce is called
.
Answer:
evolution
Natural selection
Explanation:
Answer:
The first blank is evolution and the second black is natural selection.
Explanation:
In a sample of double-stranded DNA, 30% of the nitrogenous bases are adenine (A).
What percentage of the nitrogenous bases in the sample are thymine (T)?
Choose 1 answer:
A. 20%
B. 30%
C. 60%
D. 70%
Answer:
30% thymine
Explanation:
If 30% of Adenine is present, it would be reasonable to assume that 30% of Thymine will be present, as the ratio between the two complementary nitrogenous bases will be roughly equal. Therefore, that leaves us with 40% between Cytosine and Guanine.
Is it recommended for most adults that carbohydrates make up 45-65% of their diet, proteins make up 10-35% of their diet, and fats make up 20-30% of their diet. Does Deb’s diet mee these recommendations? Support your statement with calculations
Answer:No her diet does not. She is currently eating 128.52 calories each for protein, 289.17 calories from fat, and 1413.44 calories from carbs. This means she is consuming 6.6% of her diet from protein, 14.9%, of her diet from fat, and 73.2% of her diet from carbs.
Explanation:
