Answer:
2 shows the differences among solids, liquids, and gases at the molecular level. A solid has definite volume and shape, a liquid has a definite volume but no definite shape, and a gas has neither a definite volume nor shape
Explanation:
Describe the process of water moving in and out of the cell.
Answer:
Water moves across cell membranes by diffusion, in a process known as osmosis. Osmosis refers specifically to the movement of water across a semipermeable membrane, with the solvent (water, for example) moving from an area of low solute (dissolved material) concentration to an area of high solute concentration.
Explanation:
The incidence of cystic fibrosis, a recessive genetic disorder in the Caucasian population of United States, is 1 in every 2,500 individuals. Find the number of heterozygous carriers. (p + q = 1, p2 + 2pq + q2 = 1)
Answer:
The no. of heterozygous carriers = 0.0392
Explanation:
From the given information:
The incidence of this recessive disorder i.e. q² = 1/2500
q² = 0.0004
q = 0.02
From Hardy Weinberg's Equilibrium.
p + q = 1; &
p² + 2pq + q² = 1
∴
p + 0.02 = 1
p = 1 - 0.02
p = 0.98
So, the numbers of heterozygous carrier 2pq is:
= 2 × 0.98 × 0.02
= 0.0392
Do all cells divide at the same rate? Explain
Help
Answer:
No, all cells do not divide at the same rate. Cells that require frequent replenishing, such as skin or intestinal cells, may only take roughly twelve hours to complete a cell cycle.
Which of the following is a
mechanical wave?
A. Sound
B. Light
C. Radio
D. Gamma Rays
Use your knowledge of inheritance (the passing of traits from parents to offspring) to explain why
these twins look so different even though they have the same parents. Why aren't they identical? In
your answer you should include your knowledge of gametes (sperm and egg), chromosomes, and
variation
Answer:
Fraternal twins can be different genders because they are two completely different eggs getting fertilized; but even two same gender fraternal twins do not look completely alike. Whereas for identical twins since one egg is splitting into two, the two cells have the same exact DNA make up and chromosomes.
I also believe the technical part of it is to do with genetics, like ressesive and dominant genes, because they can be the same gender, ex. both girls and one has blue eyes, fair skin, and blonde hair, the other twin has brown eyes, black hair and tan skin. The parents could be part of the genes but there is also grandparents maybe the mom's mom has blonde hair and blue eyes, with fair skin. But the dad he has brown eyes, black hair and tan skin. The moms genes were recessive, but the grandma's genes were dominant.
I tried to explain it as best as I could I hope it helps!
True or False.
The lymphatic and immune systems contain the lymphatic vessels and ducts, lymph nodes, bone marrow, and spleen.
Answer:
True
Explanation:
I also like your profile picture
The lymphatic system consists of lymphatic vessels and ducts, lymph nodes, and spleen. The immune systems consist of bone marrow. Hence, statement true.
What is immune system?The system that helps to fight infections and diseases with the help complex system of tissues, cells, organs is called as immune system.
In humans, immunity is of 3 types including:
adaptive immunity- natural immunityinnate immunity- develops throughout lifepassive immunity- borrowed from any source that doesn't last long.Bone marrow and the thymus are primary parts of the immune system. Bone marrow play significant role in production of blood cells including B and T lymphocytes. In also includes organs of lymph system such as lymph node, thymus, spleen, tonsils, lymph node, and lymph vessels.
Therefore, The statement above is true.
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The cell part that helps with cell division is the ________
Answer:
centrioles
Explanation:
Every animal-like cell has two small organelles called centrioles. They are there to help the cell when it comes time to divide. They are put to work in both the process of mitosis and the process of meiosis.
True or false the main source of energy and water cycle is gravity
Answer:
False please mark me brainlest.
Explanation:
What is it called when DNA is not bunched together
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which statement best describes one positive and one negative way that society was impacted by the use of DDT?
A. Society was positively impacted by increased insect control in crops, but it was negatively impacted by harmful chemicals.
B. Society was positively impacted by insect resistance, but it was negatively impacted by harmful chemicals.
C. Society was positively impacted by increased insect control in crops, but it was negatively impacted by malaria and typhus.
D. Society was positively impacted by insect resistance, but it was negatively impacted by malaria and typhus.
Answer: The answer is A
Explanation:
Society was positively impacted by increased insect control in crops, but it was negatively impacted by harmful chemicals. Hence option A is correct.
What is DDT?DDT is defined as the 1940s saw the development of the first synthetic modern pesticide. It aided in the prevention of illnesses like typhus and malaria. Researchers classify DDT as an endocrine-disrupting chemical, or an EDC, because there is evidence that it alters and disrupts hormones crucial for healthy health, including reproductive health, as well as neurological and immunological processes.
Even while scientists began to raise concerns about such risks in the middle of the 1940s, it wasn't until the publication of Rachel Carson's book Silent Spring in 1962 that the use of the chemical became the subject of broad public concern. DDT, often known as dichlorodiphenyltrichloroethane, is a pesticide used in farming. DDT usage was outlawed in the US in 1972. DDT is still used in several non-American nations to keep mosquitoes that cause malaria at bay.
Thus, society was positively impacted by increased insect control in crops, but it was negatively impacted by harmful chemicals. Hence option A is correct.
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which of the following substances is formed during photosynthsis hurry please thx
Answer:
Glucose
Explanation:
During photosynthesis plants produce a substance called glucose from simple inorganic molecules.
Hope this helps :D Have a fantastic day ^-^
How many different ways can the 23 homologous pairs in a human germ cell arrange themselves during Metaphase I?
Answer:
eight million
Explanation:
Eight million different ways can the 23 homologous pairs in a human germ cell.
What is Homologous pairs?One of a pair of chromosomes with the same gene sequence, locations, chromosomal length, and centromere placement is referred to as a homologous chromosome. One paternal and one maternal chromosome make up a homologous pair.
A somatic cell of a human has a total of 46 chromosomes in its nucleus. The father inherits half of them (22 autosomes Plus X or Y chromosome), while the mother inherits the other half (22 autosomes + X chromosome).
A female typically has 23 homologous chromosomes, compared to a male's 22. This is due to the fact that men' X and Y sex chromosomes are not identical. During meiosis, homologous chromosomal pairing is crucial.
Therefore, Eight million different ways can the 23 homologous pairs in a human germ cell.
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Scientists learn about the universe by studying the light that comes to Earth from stars and other objects in space. If you were a scientist hoping to understand the universe, what three questions would you ask?
50 POINTS MAKE IT FAST
Answer: Here's 4 so you can choose
How many stars are in space?
How far away from Earth are certain stars?
Are there other planets like Earth?
Could a large meteor ever strike Earth
Explanation:
Which of the following areas of science would
allow someone to obtain a job for NASA?
A. Physical Science
B. Life Science
C. Social Science
D. Medical Science
1.scientist refer to a biological community and the abiotic parts of the environment that affects the community as _______?
A. Biome
B. Ecosystem
C. Population
D. Community
which layer of the earth is about 85% of iron
Answer:
the mantle
Explanation:
2885 kilometers thick and is the middle layer of the Earth
the earth's mantle
the mantle is made up of several minerals such as iron, magnesium, silica and oxygen.
identify and explain three environmental impacts of current agricultural methods
Explanation:
It is profit making practice but it causes increased level of pathogens.
It has increased the level of chemicals in our land and water.
It has increased levels of greenhouse gases in air.
Due today, please help
The nitrogen bases will only bond with one specific nitrogen base such as A - T and G - C. This is known as:
Complimentary Base Pairing
What is the role of enzymes in the DNA replication process?
A. Enzymes read the DNA code and build a new DNA molecule from scratch.
B. Enzymes link together to form a template for a new DNA molecule to be built.
C. Enzymes split the DNA molecule into two rails and then transport corresponding nitrogenous bases to each rail.
D. Enzymes link adjacent nucleosides together, becoming an integral part of the structure of the new strands of DNA.
Answer:
B.
Explanation:
According to the reading, the sun is NOT a typical star.
O True
O False
The sequence of DNA below is part of a gene. How many amino acids are coded for by this segment?
5 ATTAGTCCGTAC 3
A. 2
B. 3
C. 4
D. 5
Answer:
b
Explanation:
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9. Mendel’s research led to several conclusions about how traits are passed through generations. Choose TWO of the conclusions from the bullet list below and provide evidence from THIS activity that supports this conclusion. (6 points)
Different forms of a gene account for variations in the inherited traits
An organism inherits two genes for each trait, one from each parent.
Some alleles are dominant over others for a given trait.
The two genes of a given trait segregate during gamete production.
#1)
Which conclusion from the list above did you pick? _________________________________________________
How does it apply to the monsters activity?
#2)
Which conclusion from the list above did you pick? _________________________________________________
How does it apply to the monsters activity?
Answer: Mendel's research lead to several conclusions about the traits and its passing through generations. The two of the conclusion are different forms of a gene account for variation in the inherited traits and some alleles are dominant over others for a given trait.
Explanation
George Mendel was a famous biologist. His research was on genes and traits. His experiment shows how genes gets transferred from parents to offspring. Also he stated about the behavior and dominance and recessive nature of that alleles.
He also gives the possibility of dominance of a trait over other trait. The different forms of gene are responsible for various types of inherited traits in an organism.
hope it helps
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Brainliest - Answer Quickly
What is the source of all energy in an lecosystem?
Options:
Cellular Respiration
Photosynthesis
Recycling of Matter
Solar Energy
Answer:
solar energy
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Answer:
SOLAR ENERGY
Explanation:
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Which activity occurs in the process of photosynthesis?
A) Chemical energy from organic molecules is
converted into light energy.
B) Organic molecules are obtained from the
environment.
C) Organic molecules are converted into light energy.
D) Light energy is converted into the chemical energy.
Answer:
A) Chemical energy from organic molecules is
converted into light energy.
Explanation:
Plants can take energy from the sun and use that energy to synthesize carbohydrates. The process by which plants convert solar energy into chemical energy is called photosynthesis. During photosynthesis, carbon dioxide and water are converted into carbohydrates and molecular oxygen.
Answer: D
Explanation: because
QUICK PLS
Body cells have
____ the number of chromosomes as sex cells.
a: 4times
b: one half
c: one fourth
d: twice
Answer:
Body cells have twice the number
Overgrazing reduces grass cover and negatively impacts the soil health by reducing it's ability to hold water . How can Overgrazing be prevented and support a more sustainable use of grasslands ?
A. Allow developers to buy rachlands for housing .
B. practice moving confined cattle every few days
C. Allow unlimited animals to graze in a given area to reach carrying capacity.
D. practice grazing an area of land at the same stage of plant growth each year .
Answer: C. Allow unlimited animals to graze in a given area to reach carrying capacity.
Explanation: I choose this as the answer because the animals grazing in the wrong parts be part of the reason the soil can't hold the water it needs, so allowing animals in a particular area that's less of a problem with Overgrazing would be helpful
Where do the mineral resources in which society depends on come from
Answer:Without minerals we would not have electricity, food, or shelter. Minerals make today's technology-based life possible, but that's something many of us take for granted.
Explanation:Soil, rocks, and minerals provide essential metals and other materials for agriculture, manufacturing, and building. 7.7. Earth scientists and engineers develop new technologies to extract resources while reducing the pollution, waste, and ecosystem degradation caused by extraction.
Does Natural Selection affect individuals or populations? EXPLAIN.
Natural selection is the process through which populations of living organisms adapt and change. Individuals in a population are naturally variable, meaning that they are all different in some ways. This variation means that some individuals have traits better suited to the environment than others.
In the experiment "What Effect Does Vinegar Have on Plant Growth?" some plants were given only water, some were given only vinegar, and the others were given various mixtures of water and vinegar. Which of the following groups is the control group in the experiment?
50% water and 50% vinager
100% water
100% vinager
or 25% vinager and 75% water
Answer:
50% water and 50% vinegar
Explanation:
Which is held constant when a gas obeys Boyle's law?
A. motion
B. pressure
C. temperature
D. volume
Answer:
B
Explanation:
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When a gas obeys Boyle's law, the temperature is held constant. The correct option is C.
What is Boyle's law?Boyle's law is given by Charles Boyle. It is a gas law that states the pressure decrease with the increase in the volume and the temperature remain constant. In other words, the pressure exerted on gas is inversely proportional to the volume of the gas.
The law shows the relationship between pressure and volume, with the temperature remaining constant. There are three gas laws which are given by different scientists. These laws show the relationship between two variables and the third remains constant. These variables are temperature, volume, and pressure.
Thus, the correct option is C. temperature regarding the gas obeys Boyle's law, and it remains constant.
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