Genetic variation during sexual reproduction comes from Crossing Over, Independent Assortment, and Random Fertilization. These processes mix up genes to create new combinations, contributing to genetic diversity.
Explanation:Three processes that contribute to genetic variation during sexual reproduction are Crossing Over, Independent Assortment, and Random Fertilization.
Crossing Over occurs during Prophase I of meiosis when homologous chromosomes exchange genetic material. This results in new combinations of genes on each chromosome and contributes greatly to genetic variation.
Independent Assortment happens during Metaphase I of meiosis when tetrads line up at the equator of the cell randomly with respect to each other. This randomness results in each of the four daughter cells created in meiosis having a different set of chromosomes, and thereby different genetic information.
Random Fertilization is the process wherein from millions of possible sperms and eggs, only a single sperm gets to fertilize an egg. This randomness also contributes to the enormous genetic variation seen in sexually reproducing organisms.
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What are three ways plastics negatively affect oceans
Apex semester 2
5.1.3
Plastics negatively affect oceans by causing entanglement of marine life, ingestion of plastic leading to health issues for marine organisms, and the breakdown into microplastics which carry toxins and enter the food chain.
There are three ways plastics negatively affect oceans, causing significant harm to marine ecosystems and biodiversity. First, plastics lead to entanglement, where marine animals become trapped in items such as old fishing nets or six-pack rings, leading to injury or death. Second, plastics present a danger when ingested by marine organisms who mistake it for food, potentially causing choking, internal injuries, and a reduced capacity for ingesting actual nutrients.
Third, as plastics break down into microplastics, they become pervasive in marine environments, entering the food chain and often carrying toxic substances which subsequently accumulate in organisms, including humans.
Meningitis and food poisoning are two examples of illness caused by which type of pathogen?
A. Bacteria
B. Fungi
C. Parasite
D. Virus
Answer: a
Explanation:
Meningitis and food poisoning are two examples of illness caused by pathogenic bacteria called Neisseria meningitidis. Food poisoning can also caused by bacteria. Hence Option A is correct.
What is Meningitis ?An inflammatory condition arises at the outer membrane or meninges of brain and spinal cord, give rise to an illness called as meningitis.
The source of meningitis can be either bacterial or viral, some are even fungal form.
The major symptoms of bacterial meningitis include paralysis, stroke, seizures, even death.
The different bacteria cause meningitis are streptococcus pneumoniae, Neisseria meningitidis, Haemophilus influenzae etc.
The other symptoms include high fever, neck become stiff, headache, nausea, vomiting, confusion, rashes.
The major way bacteria can transfer from infected to healthy person are coughing, sneezing etc.
Hence Option A is correct.
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The body is composed of microscopic cells that are only visible if viewed under a
a. microscope
b. telescope
c. nucleus
Answer:
A. Microscope
Explanation:
If you look at the definition of each thing that you listed, you'll be able to deduct which is the correct answer.
Microscope - an optical instrument used for viewing very small objects, such as mineral samples or animal or plant cells, typically magnified several hundred times.
Telescope - an optical instrument designed to make distant objects appear nearer, containing an arrangement of lenses, or of curved mirrors and lenses, by which rays of light are collected and focused and the resulting image magnified.
Nucleus - the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
Final answer:
The body is composed of cells that can only be viewed using a microscope. Special stains are used to increase the visibility of cell components under a microscope. The cell is the basic unit of life according to the unified cell theory.
Explanation:
The microscopic cells that compose the body can only be viewed using a microscope, an instrument that magnifies objects such as cells. Cells are the basic units of life and form the foundation of all living organisms. To view the individual components of cells more clearly, scientists use special techniques, such as applying special stains, which increase the contrast and allow for more detailed observation under a light microscope. Electron microscopes offer even higher magnification and resolution, providing more detailed images of cells.
The smallest unit of life is known as the cell. The unified cell theory outlines three main points: all living organisms are composed of one or more cells; the cell is the basic unit of life; and all new cells arise from pre-existing cells.
Which organelle stores most of a cell’s DNA?
Answer: the nucleous
Explanation:
The organelle that stores most of a cell's DNA is the nucleus.
The nucleus is a membrane-bound organelle found in eukaryotic cells, and it serves as the control center of the cell. Within the nucleus, the genetic material, which is in the form of DNA (deoxyribonucleic acid), is organized into structures called chromosomes. These chromosomes contain the genes that carry the instructions for various cellular processes and traits.
The DNA in the nucleus is responsible for the transmission of genetic information from one generation to the next and plays a crucial role in protein synthesis and cellular functioning. The nucleus also regulates the expression of genes and controls the replication and transcription of DNA.
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Two nursing assistants are in line to wash their hands at a hospital after leaving a patient in an isolation room. The first NA
washes her hands and then uses her hands to turn off the faucet before drying them with a paper towel. The second NA
turns on the water with her hands and then proceeds to wash and dry her hands with a paper towel.
Which statement best describes errors demonstrated by the nursing assistants?
The first NA did not ensure a clean hand-washing environment, and the second NA did not properly turn off the water
The first NA did not properly turn off the water, and the second NA did not ensure a clean hand-washing environment.
The first NA did not properly turn off the water, and the second NA did not properly use paper towels.
The first NA did not properly use paper towels, and the second NA did not ensure a clean hand-washing environment.
I think the answer is C. The first NA did not properly turn off the water, and the second NA did not properly use paper towels.
When you are to close off the sink you use the paper towel used to dry your hands. When the first NA opened the sink the hands where dirty, the NA then proceeded to close the sink with the washed hands.... now the hands are contaminated yet again.
The second NA used the paper towel to wash AND dry the hands. You are supposed to use soap for 30 seconds and then rinse for 30 seconds. The towel is to be used only when drying and not washing.
I hope this helps! :)
Answer:
The answer your looking for is C
Explanation:
How does energy travel in an ecosystem?
Answer:
Through the food chain.
Explanation:
Answer:
Energy passes through one organism to the next. Autotrophs, like plants, absorb energy from the sun and make their own food. Then heterotroph herbivores, like a rabbit, consume the plants and only gain 1/10 of the energy that plant had. Next comes a carnivore or omnivore heterotroph, like a snake, they recieve 1/10 of the energy of their food. And then another carnivore or omnivore, like an eagle, will receive 1/10 of the energy of their food.
Explanation:
Arrange the organization of life from simple to complex ?
Answer:
C. Cell, tissues, organs, organ systems
Explanation:
Cells are the basic unit of life and also serve as a structural unit of all living beings. Many cells are together arranged into tissues to carry out specific functions. A group of tissues together make an organ while a group of organs with related functions together make an organ system.
Hence, the organization of life from simple to complex is as follows:
Cell, tissues, organs, organ systems
The movement of carbon through an ecosystem is related to the flow of energy. What is the role of carbon dioxide in the flow of energy through an ecosystem? Carbon dioxide is absorbed by -
A: decomposers to help break down organic matter Strike Reset
B: producers and used to make sugars Strike Reset
C: primary consumers to help in the formation of ATP Strike Reset
D: secondary consumers and used to make proteins
The role of carbon dioxide in the flow of energy through an ecosystem. Carbon dioxide is absorbed by producers and used to make sugars Strike Reset
What are the function of carbon dioxide ?carbon dioxide is the union of One carbon atom and two oxygen atoms by forming a chemical compound, can be found in the atmosphere.
It is present as gaseous form in room temperature, carbon dioxide is released when human and animals exhale which can be taken by autotropic plants to make food by the process of photosynthesis.
It is a greenhouse gas present in very low concentrations in the Earth’s atmosphere, emitted from hydrocarbon fuels like burning of wood, coal; The fossil fuel released when Carbon reacts with oxygen to form carbon dioxide and water vapor.
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In a dihybrid cross for round and yellow seeds (RrYy x RrYy), what is the probability of having green and wrinkled seeds?
.
THE
Key: R = round
r = wrinkled
Y = yellow
y = green
Answer: 1/16.
Explanation:
Mendel explains the concept of dominance, laws of independent assortment and the laws of segregation by working on the plant Pisum sativum. Mendel is known as the father of genetics.
The dihybrid cross includes the two cross at a time. The round and yellow seeds has been crossed with the wrinkled and green seeds. By crossing the probability of obtaining the green and wrinkled seeds is 1/16. The sparate cross of round and wrinkled seeds, yellow and green seeds - the probability of gettting the recessive trait is 1/4. The combined probability is 1/4 × 1/4 = 1/16.
Thus, the answer is 1/16.
How explosively or quietly a volcano erupts is not affected by the _____.
magma’s composition
magma’s temperature
size of the volcano’s cone
concentration of dissolved gases in the magma
Answer:
size of the volcanos cone
Explanation:
The size of volcano's cone does not affect how explosively or quietly a volcano erupts.
What is a volcano?.A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Volcanoes are closely associated with plate tectonic activity. Most volcanoes, such as those of Japan and Iceland, occur on the margins of the enormous solid rocky plates that make up Earth’s surface.
Therefore, third option is the correct answer.
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Which statement best describes cancer cells?
A. They grow as a single layer of cells.
B. They cease to reproduce after 20–50 mitotic divisions.
C. They reproduce only when needed to replace missing cells.
D. They are not regulated by contact inhibition.
which RNA is
found inside the nucleus?
balanced equation for Fe+O2 ->Fe2O3
The answer is:
The balanced equation is:
[tex]4Fe+3O_2=2Fe_{2}O_{3}[/tex]
Why?Finding a balanced equation of a reaction means making equal the number of atoms for both reactants and products sides, according to the conservation mass law, the mass is always conserved, so, we need to make both quantities of atoms/molecules match.
So, we are given the following reaction:
[tex]Fe+O_2=Fe_{2}O_{3}[/tex]
For the reactants, we have 1 molecule of Fe and 2 of O
For the products, we have 2 molecules of Fe and 3 of O
So, balancing the Oxygen, we have:
[tex]Fe+3*O_2=Fe_{2}O_{3}[/tex]
[tex]Fe+3O_2=Fe_{2}O_{3}[/tex]
Now, there are 6 atoms of oxygen in the reactant, let's multiply the product by 2 in order to make both sides match, so:
[tex]Fe+3O_2=2*(Fe_{2}O_{3})[/tex]
[tex]Fe+3O_2=2(Fe_{2}O_{3})[/tex]
Now, we can see that there are 6 atoms of Oxygen in both sides, but there are 4 atoms of Fe in the products and just 1 atom in the reactants, so, we need to multiply the Fe by 4.
So, balancing the Iron (Fe) we have:
[tex]4*Fe+3O_2=2(Fe_{2}O_{3})[/tex]
[tex]4Fe+3O_2=2Fe_{2}O_{3}[/tex]
Hence, we can see that we now have the same number of atoms on both sides, we have:
[tex]Fe_{reactants}=4\\O_{reactants}=6\\Fe_{products}=4\\O_{products}=6[/tex]
Therefore, the equation is balanced.
[tex]4Fe+3O_2=2Fe_{2}O_{3}[/tex]
Have a nice day!
Which statement describes a way in which the digestive and excretory
systems work together?
A. The nephrons absorb nutrients from food going to the large
intestine.
B. The excretory system balances blood gases in the small intestine.
c. The intestinal villi filter blood and send wastes to the bladder.
D. The excretory system balances the salts and water obtained from
digested food
Answer:The excretory system balances the salts and water obtained from
digested food
Explanation:
Answer:
D. The excretory system removes excess salts absorbed from digested food.
Explanation:
just took the test lol
A scientist wants to determine the effect of a new type of gasoline. He fills
one car with normal gasoline and another identical car with the new gasoline.
Which is the control group?
A. The new type of gasoline
B. The car with the normal gasoline
c. The car with the new gasoline
The amount of gasoline used
D. The amount of gasoline used
Answer:
The correct answer is B) The car with normal gasoline.
Explanation:
A control group is the one that shows "normal" or common characteristics. In this case, the normal group is the one with the usual gasoline. In other fields, the control groups could be the blank ones, like in chemistry or the average ones. In general, control groups show a pattern that could be comparable to the other ones in order to establish whether there was a change or difference or not.
A banana plant produces rhizomes, which are involved in ______.
A rhizome is a horizontal underground stem used by banana plants for asexual reproduction, leading to the creation of genetically identical new plants, or clones, and is critical for species propagation, especially in seedless varieties.
Explanation:A rhizome is a type of horizontal underground stem that plays a crucial role in vegetative, asexual reproduction in certain plants, such as the banana plant. These structures are specialized storage organs that also enable the clonal propagation of the plants. When a rhizome grows, it can give rise to new plants that are genetically identical to their parent plant. In the case of bananas and many grasses, this mechanism is particularly important because it perpetuates the organism even if the original stem flowers, senesces, and dies. Thus, rhizomes are crucial for the survival and spread of these species, especially for those varieties that do not produce viable seeds.
Other plant structures, such as corms, tubers, and bulbs, also provide similar functions by storing food and enabling asexual reproduction, although they differ in form and growth patterns. Each of these modifications allows plants to thrive in a variety of environments and adapt better to different habitat conditions.
Final answer:
Banana plants reproduce via rhizomes, underground stems specialized in vegetative asexual reproduction, creating clones of the parent plants. Other stem modifications like stolons, runners, and tubers also assist in reproduction and food storage.
Explanation:
A banana plant produces rhizomes, which are involved in vegetative asexual reproduction. Rhizomes are essentially horizontal underground stems that enable a plant to propagate and extend its reach vegetatively. These specialized structures allow plants like the banana to grow new plants that are genetically identical, or clones, of the parents, ensuring that any favourable characteristics are preserved. Furthermore, through vegetative propagation, the banana plant can thrive even if the original stem flowers and then dies, as the rhizomes can continue to live and create new shoots.
In addition to rhizomes, there are other stem modifications such as stolons, runners, corms, tubers, and bulbs, which also play a role in vegetative reproduction and storage of food. These adaptations enable plants to survive in a variety of environments and conditions, demonstrating the botanical richness and diversity in the plant kingdom.
what came about in the devonian period
Answer:
The Devonian Period occurred from 416 million to 358 million years ago. It was the fourth period of the Paleozoic Era. It was preceded by the Silurian Period and followed by the Carboniferous Period. It is often known as the “Age of Fishes,” although significant events also happened in the evolution of plants, the first insects and other animals.
Suppose you uncovered the fossilized skull of an animal. How could you use its teeth to help determine whether it was a carnivore or a herbivore?
Answer:
The Teeth
Explanation:
Carnivores have teeth that are more for ripping and shredding a prey's flesh. They are sharper. Herbivores have more square and flat teeth for mashing leaves and grass.
To determine if a fossilized animal was a carnivore or herbivore, examine its teeth. Carnivores have sharp, pointed teeth for tearing flesh, while herbivores have flat, broad teeth for grinding plant material. These dental adaptations reflect their dietary habits.
Carnivores typically have sharp, pointed teeth designed for tearing flesh. These include canines for gripping and incisors for shearing. Their molars are often sharp, known as carnassials, which work like scissors. Examples include lions and wolves.
In contrast, herbivores possess flat, broad teeth adapted for grinding plant material. They have well-developed molars and premolars suitable for chewing, with incisors that are often used for cutting plants.
Examples include cows and horses. The differences in dental structures reflect their diets and provide insight into the ecological roles these animals played.
Oceanic lithosphere is destroyed at _____.
divergent boundaries
ocean ridges
convergent boundaries
transform fault boundaries
Answer:
Oceanic lithosphere is destroyed at convergent boundaries.- third choice
Hello There!
Oceanic lithosphere is destroyed at “Convergent Boundaries
Convergent boundaries are places where two tectonic plates meet each other.
which category do you think humans belong to? Why do you think they fit in this category?
Answer: Animal
Explanation: Us humans are an animal because we don’t make our own food like plants do. We kill and eat other plants and animals.
Answer:
Pluto
Explanation:
Select the correct answer from each drop-down menu.
Mutations can be categorized based on the kind of effect they have on an organism. Blue eyes in humans are a result of a mutation in the OGA2 gene
which controls the production of pigment melanin in the iris
This mutation is an example of a
mutation. Such mutations have
v
effect on an organism's survival
Reset
Next
Answer:
1. neutral 2.no
Explanation:
took the test and got it right
Mutations in DNA can be categorized based on their effects on an organism. The mutation in the OCA2 gene that results in blue eyes is a neutral mutation, having neither a positive nor negative effect on survival.
Explanation:Mutations can be categorized based on the type of effect they have on an organism. A mutation is a change that occurs in our DNA sequence, either due to mistakes when the DNA is copied or as the result of environmental factors such as UV light and cigarette smoke. The example given, of blue eyes in humans, is the result of a mutation in the OCA2 gene which controls the production of pigment melanin in the iris. This mutation is an example of a neutral mutation. Neutral mutations have neither a positive nor a negative effect on an organism's survival.
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mendel used over 28,000 pea plants in his experiment. How does this large sample size make his results more reliable?
(I'm not sure about this one)
Answer:
it made his actual results approach the results predicted by probability
Explanation:
on apex
based on the information in the graph, which region is experiencing the greatest increase in its population? Europe, Africa, mexico, or asia
Answer:it is Asia
Explanation: they have the largest population. India is close second in population
Answer:
Africa i promise
Explanation:
Which process is not a way in which cells maintain homeostasis?
A) Communicating with other cell
B)Taking in the molecules they need
C)Breaking down Unneeded molecules
D)Changing their external environment
Answer:
Changing their external environment
Explanation:
Answer: D) Changing their external environment
Explanation: cells cannot change their external environment to maintain homeostasis. They communicate with other cells via cell signaling, they take up nutrients for sustainability and growth, cells also breakdown unwanted molecules as a way of waste management.
But cells don't change their external environment to maintain homeostasis.
Role of RNA in gene expression is to
Answer:
serves as an intermediate molecule that translates the instructions from DNA into protein.
Explanation:
Answer:
The correct answer is -
In transcription- code the information present in DNA into an mRNA molecule.
In translation- move to the cytoplasm and translate the code into the amino acid sequence with the help of tRNA and rRNA.
Explanation:
Gene expression is the process in which the molecule in which all information present in DNA, first transcribed to RNA and then move to the cytoplasm to translated from RNA to protein with the correct sequence of the amino acid.
RNA plays an important role in gene expression. Each step involves different RNA molecules such as mRNA that is a transcribed RNA molecule that carries information from the nucleus to cytoplasm and binds with another molecule of RNA known as tRNA that translates coded mRNA to the protein.
Thus, the correct answer is -
In transcription- code the information present in DNA into an mRNA molecule.
In translation- move to the cytoplasm and translate the code into the amino acid sequence with help of tRNA and rRNA.
What happens when the Sun emits more energy than normal?
Answer:
it gets hotter on the surface
Explanation:
The sun emits electromagnetic energy which falls on earth in the form of radiation. The energy is emitted as rays and travels through space at the speed of light. ... When the sun emits more energy than normal, there is a little higher end of temperature experienced on the surface of earth
Answer: it’s b
Explanation:
Human hair has which type of cuticle?
Answer:
Human hair has cuticle scales that are flattened and narrow, also called imbricate. Animal hair had different types of cuticles that is described and pictured later in the chapter under animal hair. The cuticle is a transparent outer layer of the hair shaft.
The cuticle of human hair is the outermost layer composed of very hard, keratinized cells. These cells originate from the hair matrix in the hair bulb and form the visible part of the hair when they are pushed to the skin surface and keratinize.
Explanation:Human hair consists of multiple layers, with the cuticle being the outermost one. This layer is made of a series of very hard, keratinized cells that protect the inner layers of the hair shaft. The production of these cells originates from the hair matrix in the hair bulb, a part of the hair root that lies deep in the skin.
As the basal cells of the hair bulb divide, new cells are pushed outward, forming the cuticle and other layers of the hair shaft. Once these cells are pushed to the skin surface, they keratinize complete, forming the external part of the hair that we see. This process is what forms the shaft of hair that is visible to us.
The entire external hair, including the cuticle, is composed entirely of keratin. Hence, our hair does not have any sensation. It is also why humans can cut or shave their hair without causing damage to the hair structure.
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Which of the following is an example of organic matter?
An example of an organic matter is sugar, which is mostly made up of carbon, hydrogen, and oxygen.
What is an organic matter?Organic matter is the name of the matter which is commonly made up of three main components, oxygen, hydrogen, and carbon.
Sugar is an organic compound.
Thus, the correct option is C, sugar, which is mostly made up of carbon, hydrogen, and oxygen.
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Which kind of aquatic ecosystem does the photograph most likely show?
A. Marsh
B. Swamp
C. Lake
D. River
Answer:
river
Explanation:
it is smaller than the width of a lake
The correct answer is D. River
Explanation:
Rivers are one of the most common ecosystems. A river is characterized by flowing water in which biotic factors (animals, plants, bacteria, etc.) and abiotic factors (rocks, water, minerals) interact. Also, they cross major ecosystems such as forests or rainforests.
Moreover, rivers are unique because they contain fresh rather than salt water as in the ocean, and they are always flowing while in a marsh, swamp or lake the water does not flow. This suggests the ecosystem is the photograph is a river because in this the water flows and as a result of this, there is a strong current which is possible in a river but not in a lake, marsh or swamp.
what will most likely happen to a plant that does not receive enough CO2
Answer:
the Calvin Cycle will produce less glucose
Explanation:
apex