Which of those ancient populations is the most likely to have contributed significantly to the bottleneck effect in the YDNA variation observed across much of Eurasia?
1. Yamnaya
2. Denisovans
3. Basal Eurasians
4. Ancient North Eurasians
5. Gravettians
Answer:
The correct answer is "Yamnaya".
Explanation:
In genetics, a population or genetic bottleneck is defined as a reduction on the size of a population as a result of an environmental effect or human intervention. Regarding the Y chromosome bottleneck, the Yamnaya is an ancient population that contributed the most due to its sex-biased and stratified culture. The Yamnaya were violent and left behind many male skeletons, where just few type of persons were able to reproduce.
difin spinale cord ? state its function
Answer:
Spinal cord is a colon of nerve tissue that runs from the base of the skull to the center of the back.
Its function is to act as a highway communication between the body and the brain.
Explanation:
Why do plants die if they get extra water
Answer:
Over-watering severely limits, even cuts off the supply of oxygen that roots depend on to function properly, meaning that plants do not get adequate oxygen to survive. Furthermore, too much water can also lead to root rotting and the irreversible decay of roots.
Explanation:
briefly explain the relationship between cells, organs, and tissues
Answer:
In the human body, cells are the basic units of life. Groups of cells working together for a specific function form tissues. Organs are two or more tissues operating together. Even separate organs work together, forming body systems.
Explanation:
I hope this helps you out and if your feeling generous plz mark brainliest it helps me a lot thank you:)
Answer:
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems.The function of an organ system depends on the integrated activity of its organs.
Explanation:
1. John is suffering from autosomal dominant deafness (D) and his wife Mary is normal.
Considering complete penetrance for this trait (P=1), what is the probability that this
couple's first child would have this disorder?
Answer:
Autosomal dominant inheritance: A person affected by an autosomal dominant disorder has a 50 percent chance of passing the mutated gene to each child. The chance that a child will not inherit the mutated gene is also 50 percent. However, in some cases an autosomal dominant disorder results from a new mutation that occurs during the formation of egg or sperm cells or early in embryonic development. In these cases, the child's parents are unaffected, but the child may pass on the condition to his or her own children.
Electrical signals are sent through the body by the ______ tissue
A. Nervous
B. Connective
C. Epithelial
D. Muscle
Answer: A. Nervous tissue
Explanation: google
Which of the following best describes energy transformations in ecosystems?
a.
Most energy in a lower trophic level is passed to higher trophic levels.
b.
Heat is not a significant waste product as energy passes between trophic levels.
c.
Most of the energy collected by an organism is not passed on to other organisms.
d.
Tertiary consumers collect the most energy in an ecosystem.
Answer: C - Most of the energy collected by an organism is not passed on to other organisms.
Explanation:
right on edge 2020
also only 10% of energy is transferred to the next trophic level
The best description of energy transformation in an ecosystem is most of the energy collected by an organism is not passed on to the other organisms. Thus, the correct option is C.
What is Energy transformation in an ecosystem?Energy is transferred between different organisms in a food web from producers to different consumers. The energy is used by the organisms to carry out most of the complex tasks in the food web. The vast majority of energy which exists in a food web originates from the sun and is transformed into chemical energy by the process of photosynthesis in the plants.
Energy transformation in an ecosystem follows 10% law, where only 10% of the energy is transferred to the next trophic level in an ecosystem. Thus, most of the energy collected by an organism is not passed on to other organisms.
Therefore, the correct option is C.
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A sample of peptide of unknown sequence was treated with trypsin to produce the following smaller peptides:
1) Met-Val-Ser-Thr-Lys
2) Val-Ile-Trp-Thr-Leu-Met-Ile
3) Leu-Phe-Asn-Glu-Ser-Arg
Another sample of the same peptide was treated with chymotrypsin and gave the following smaller peptides:
1) Asn-Glu-Ser-Arg-Val-Ile-Trp
2) Thr-Leu-Met-Ile
3) Met-Val-Ser-Thr-Lys-Leu-Phe
What is the sequence of the original peptide?
Answer:
The sequence is >> Met-Val-Ser-Thr-Lys-Leu-Phe-Asn-Glu-Ser-Arg-Val-Ile-Trp-Thr-Leu-Met-Ile, or abbreviated M-V-S-T-K-L-F-N-E-S-R-V-I-W-T-L-M-I
Explanation:
Trypsin is a serine protease enzyme capable of hydrolyzing different types of proteins. This enzyme is used in biotechnology and molecular biology to hydrolyze at the carboxyl side of arginine or lysine residues. Moreover, chymotrypsin is another digestive protease that also catalyzes the breakdown of proteins into small polypeptide chains. This enzyme cuts the C-terminal side of aromatic amino acids such as tryptophan (W), tyrosine (Y) and phenylalanine (F) on peptide chains.
How does cell volume affect nutrient exchange between the cell and its external environment?
a. Cells with a large volume and small surface area are well-adapted for nutrient
exchange.
b. Very large cells are the best adapted for nutrient exchange.
c. The ratio of cell volume to surface area determines the efficiency of nutrient
exchange.
d. Very small cells are the best adapted for nutrient exchange.
e. Nutrient exchange is not impacted by cell volume.
Answer:
d. Very small cells are the best adapted for nutrient exchange.
Explanation:
The need to be able to pass nutrients and other substances into and out of the cell limits how big cells can get. The larger a cell is, the more difficult it is for nutrients and gases to move in and out of the cell because the volume is larger than the surface area. Smaller cells can exchange nutrients with the external environment more quickly.
Idk what it is so I jus bubbled it but I still need help
chart should have an informative title that describes what was plotted. (1pt)
Table 2
PNP concentration (umole/ml)
Absorbance at peak absorbance wavelength
0.00
0.0
0.02
0.53
0.04
0.82
0.06
1.47
0.08
1.82
6. Type out the equation of the linear trendline of your standard curve. (0.5 pt)
7. Based on the standard curve, what is the extinction coefficient of PNP? Do not
forget to include units. (1 pt)
The first known bird fossils date to which era of time.
Answer: Jurassic era
Explanation:
Hope this helps
Choose true or false for the following statements regarding human genetic diseases.
1. Genetic diseases are spread by shared environmental conditions.
True
False
2. Genetic disorders are more common in families with one affected member as compared to the general population.
True
False
3. Both members of identical and fraternal twin pairs have the same likelihood of expressing the same genetic disease.
True
False
4. Genetic diseases occur at the same rate in all human populations.
True
False
5. Most genetic diseases have a specific age of onset.
True
False
6. Many human and animal genetic disorders share similar characteristics
True
False
Answer:
1. False
2. True
3. False
4. False
5. False
6. True
Explanation:
1. Remember, the term Genetic diseases implies that they are diseases inherited genetically. Thus, environmental conditions have no direct influence on the spread of genetic diseases.
2. We can make this conclusion because research has shown that genetic disorders are more common in families with one affected member as compared to the general population. In other words, the family's medical history is part of the determinant factor.
3. Some recent studies have shown that both members of identical and fraternal twin pairs do not have the same likelihood of expressing the same genetic disease.
4. Genetic diseases do not occur at the same rate in all human populations. Researchers often make reference to findings discovered from surviving victims of the Hiroshima nuclear bomb which is said to be the cause of some genetic diseases. Also, the sickle cell genetic disease rate of occurrence is believed to be high in Africa than in North America.
5. Scientists believe that there is no specific age of onset of genetic disease. That is to say, they may appear within an age range but not a specific age.
6. Indeed, many human and animal genetic disorders share similar characteristics . A good example is the albino genetic order in humans has been discovered to share similar characteristics that is found in animals.
Cancer cells are often a result of the disruption of what process in cells
Answer:
Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
Explanation:
Nutrition Facts
Serving Size----8 oz.
Servings---------2
Amount Per Serving
Calories---------150
% Daily Value*
Total Fat---------0g---------0%
Sodium----------70 mg----3%
Total Carb.-----46g-------15%
Protein-----------0g---------0%
*Percent Daily Values are based on a 2,000 calorie diet
8
The table above shows the nutritional information in a bottle of pop. Drinking 16 oz of this beverage would provide which of the following?
A.
30% of the total carbohydrates for a person on a 1,000 calorie diet
B.
15% of the total carbohydrates for a person on a 1,000 diet
C.
15% of the total carbohydrates for a person on a 2,000 calorie diet
D.
30% of the total carbohydrates for a person on a 2,000 calorie diet
Answer:
d 30%/2,000
Explanation:
table is based on 2000 calories, and one serving is 8 oz. thus question is for 2 servings. which equals 30% carb of 2k calorie diet
Answer:
D
Explanation:
how do you inquire data in a certain field of study?write your top three methods and
describe each
Answer:
a review of published literature (secondary data collection)carry out interviewsperform a surveyExplanation:
1. Review published literature: This method involves reading through already published works containing meaning data about the particular field of study. For example, you read through textbooks, past newspapers, magazines, academic papers, etc.
2. Carry out interviews: This simply requires face to face or a virtual one on one interactive session with your respondents in other to record the data they provide.
3. Perform a survey: A survey here implies that issuing out a paper-based questionnaire or an online questionnaire (form) to be filled by the subjects of the research.
The top 3 methods that i use to inquire data in a certain field of study are;
1) Interviews
2) Questionnaires and Surveys
3) Observations
Methods of Collection of DataThere are different ways of collecting data for an experiment or research or study but my 3 top methods are as follows;
Interviews; Interviews are basically a structured conversation whereby the person seeking for data asks questions from other people who provide the required answers.Questionnaires and surveys; A questionnaire is simply any written set of questions that are targeted at seeking responses from participants, while a survey includes both the questionnaires and the process of collecting, aggregating, and analyzing the responses from those questions.Observation; This is primarily an effective research technique whereby i observe the ongoing behavior/response of certain individuals or participants to make a conclusion or inference.Read more about Collection of Data at; https://brainly.com/question/8100970
what describes each hydrogen bond?
Answer:
A hydrogen bond is a type of attractive (dipole-dipole) interaction between an electronegative atom and a hydrogen atom bonded to another electronegative atom. This bond always involves a hydrogen atom. Hydrogen bonds can occur between molecules or within parts of a single molecule.
how do villi help to increase the absorption of digested food in to the blood stream
Answer:
The cells of the villi and another part of the small intestine, known as the crypts, transport food from the digestive tract into the bloodstream, where they can be used by the body. The villi aid in absorption by increasing the surface area of the intestine and contain specialized cells which transport different types of nutrients into the blood.
Explanation:
A group of cattle moving as herd Maintains _ with each other
Answer: eye contact
Explanation:
www.grandin.com
Which statement does not serve as evidence for the theory of
plate tectonics?
A Earthquakes and eruptions most often occur along plate
boundaries.
B
Sea-floor rock has magnetic patterns and is youngest near
mid-ocean ridges.
© Radiometric dating shows that rock on Africa and South
America formed at the same time.
D The sea-floor is older than the continental crust.
Answer: B
Explanation:
What 2 processes that use a channel protein that transport substances in or out the cell.
A.osmosis
B. Facilliated diffusion
C. Endocytosis
D. Molecular Pumps?
Answer:
The answer is Fallicitated Diffusion. Also Osmosis, because it requires an input of energy and is accomplished through carrier proteins and channels. I'm really sorry if I'm wrong. I might be wrong :( sorry in advance if i am.
: Research coal and natural gas as a source of energy.
Answer:
Its fossil energy non renewable source
Explanation:
Answer:
Coal vs Natural Gas Coal is a sedimentary rock with a high concentration of hydrocarbons and carbon. Given that it takes millions of years for coal to develop, it is categorized as a nonrenewable energy source. Coal is combustible and typically black or brownish black in color. Natural gas is a naturally occurring mixture of gaseous hydrocarbons, mostly methane, with small traces of other higher alkanes. Coal and natural gas have different benefits, effects on the Earth, and impacts on human health. Natural gas is a fossil fuel; however its global warming emissions are significantly smaller compared to those from coal or oil. When combusted in a modern, efficient natural gas-power plant, natural gas releases between 50 and 60 percent less carbon dioxide (CO2) than pollution from an average modern coal plant. The impacts of human health due to air pollution from both coal and natural gas can lead to asthma and breathing issues, brain damage, heart problems, cancer, neurological disorders, and early mortality. These conditions are from the releasing of mercury, lead, sulfur dioxide, nitrogen oxides, particulates, and other heavy metals in to the air. In 2021, electricity producers in the United States paid roughly $4.98 per million British thermal units for natural gas. Coal power plant operators, on the other hand, paid an average of 1.98 US dollars; in simpler terms, the cost of generating electricity is cheaper using coal. Coal is a reliable, cheap source of power. It is easy to store, reduces dependence on oil, and creates many jobs. On the other hand, when burned to create power, natural gas produces roughly half the carbon dioxide (CO2) and one-tenth the air pollutants produced by coal. By using gas instead of coal, there is significant potential to cut near-term CO2 emissions and air pollution by using gas over coal. It is adaptive. A gas-fired power plant starts and stops much faster than a coal-fired unit. Both gas and coal have plentiful pros and cons however gas is the better one to use. Gas is more abundant and pollutes more than coal. Though coal is cheaper, the effects on the environment and human health are not worth the gamble. https://www.shell.com/energy-and-innovation/natural-gas/natural-gas-and-its-advantages.html http://groundtruthtrekking.org/Reports/Coal-Electricity-Prices-Externalities-Analysis/1/Coal-Electricity-Prices-Externalities-Levelized-Cost/ https://www.statista.com/statistics/189180/natural-gas-vis-a-vis-coal-prices/
I HAVE 2 QUESTIONS!!!
1. Organisms that get energy by consuming other organisms are??
2. An organism acts to a stimulus with a(n) ???
Answer:
1.heterotrophs or consumers
2. An organism reacts to a stimulus with a response- an action or change in behavior. ... Another characteristic of organisms is the ability to reproduce, or produce offspring that are similar to the parents.
Rapid erosion in the desert is caused by:
hot temperatures
humid weather
loose soil
dense vegetation
Answer:
losse soil
Explanation:
I am homeschooled and this is the answer for my school
NEED HELP ASAP *
Because of its polar nature, water is extremely effective
A)at forming ionic bonds
B)at sending electrical impulses through the body
C)as a solvent of many materials
D)as an organic compound *
Answer:
C
Explanation:
Which of the following characteristics least relates to prokaryotic cells?
1.cells that do not have a nucleus or membrane bound organelles
2.cells that have a nucleus and membrane bound organelles
3. bacteria
4. Archaea
Answer:
2
Explanation:
Prokaryotic cells don't have a nucleus or membrane bound organelles
Cells that have a nucleus and membrane bound organelles are least relates to prokaryotic cells.
A prokaryote is a single celled organism that lacks a nucleus, and other membrane bound organelles.What are eukaryotes?Eukaryotes are organisms whose cells contain a nucleus and other membrane-bound organelles. There is a wide range of eukaryotic organisms, including all animals, plants, fungi, and protists, as well as most algae. Eukaryotes may be either single-celled or multicellular.To know more about cells here
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the article says the forest and savanna "could degenerate into chaotic mutual encroachment." What does encroachment mean?
A.to become filled with roaches
B.to hide behind something else
C.to dig a trench around something
D.to advance beyond the usual limits
Answer:
D.to advance beyond the usual limits
Explanation:
According to the article, it says that the forest and savanna "could degenerate into chaotic mutual encroachment." and the term "encroachment" as used in the sentence means to advance beyond usual limits.
For a thing to encroach, it means it has overstepped its boundary.
Who won the French and Indian War? Question 4 options: The Spanish The British The French The Indians
Answer: The British
Explanation:
The British had more training and supplies.
I'm dropping out
I'm tired of University, I'm sick of all my professors for treating me harshly especially during these hard times, and I hate taking midterms.
I'm currently a college freshman in the middle of the semester, and things have been pretty tough. I've been procrastinating the whole week because I had everything going on and I couldn't keep up. I'm a biology major (pre-med) and I have to take two science classes. I suck at managing time and I suck at studying. I feel like I cannot do this. Also, whenever I do my assignments, my professors grade so friggen harshly & give me unfair grades even though I work all the way through midnight finishing it.
I'm a good student, it's just that you know some people can be burned out. I am burned out and college has just been draining my soul each day. Should I drop out?
Answer:
Hey do you want to talk about it? Its going to be okay.
Explanation:
Molecules that are ___
and ____
membrane easily.
pass through the cell