Answer:
Gel electrophoresis is a technique used to separate DNA fragments according to their size. DNA samples are loaded into wells (indentations) at one end of a gel, and an electric current is applied to pull them through the gel. DNA fragments are negatively charged, so they move towards the positive electrode.
Define transpiration:
Answer:
the exhalation of water vapor through the stomata.
Jane is observing a cell under an electron microscope. She identifies an organelle having an outer and an inner membrane. She also notices that the outer membrane is smooth while the inner one is highly folded. Which organelle is Jane observing?
A.
Mitochondria
B.
Golgi bodies
C.
Nucleus
The correct option is
Mitochondria is one of the organelles that are found in living cells and it is the one responsible for the production of ATP, which is the source of energy that is usable by the cells. Mitochondria is designed in such a way that, it will be able to carry out its functions efficiently. Mitochondrial has two membranes, one at the outside and the other one at the inside. While the outer membrane is smooth, the inner one is highly folded and it formed a structure called cristae. The folding of the inner membrane serves to increase the surface area inside the mitochondria.
Answer:
The correct answer in A. Mitochondria
Explanation:
I got it right on Edmentum
The wind stirs up ___ currents.
A. Cold-water
B. Warm-water
C. Deep
D. Surface
Answer:
the answer is Surface
Explanation:
Wind creates surface currents by dragging a layer of water when it passes over the water’s surface. This differs from deep ocean currents which are mainly driven by temperature and salinity differences.
Explanation:Surface currents are oceanic currents that occur at or near the surface of the ocean, and they are primarily driven by the wind. These currents are responsible for moving large amounts of water horizontally across the ocean's surface. Wind interacts with the surface of the ocean, creating friction and causing the water to move in the same direction as the wind.
When the wind blows across the surface of the ocean, it imparts its energy to the water, generating these surface currents. The direction and strength of surface currents depend on factors such as wind speed, wind duration, and the geography of the ocean. These currents can have a significant impact on various aspects of the marine environment, including climate, marine life, and navigation.
So, in the sentence "The wind stirs up surface currents," the word "surface" indicates that the wind's action primarily affects the currents near the surface of the ocean.
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What causes high and low tides?
Answer:
High and low tides are caused by the moons gravitational pull on the earth.
Explanation:
Hope i helped you.
They are caused by the moons gravitational pull
The two-step process by which cells read a gene and produce a string of amino acids that will eventually become a protein is called: ____________________ and ______________________
Answer:
transcription and translation
The two-step process by which cells read a gene and produce a protein is called transcription and translation. These two processes form the basis of gene expression whereby genetic information is transferred from DNA to RNA (transcription), and then from RNA to protein (translation).
Explanation:The two-step process by which cells read a gene and produce a string of amino acids that will eventually become a protein is called transcription and translation.
In the process of transcription, a strand of messenger RNA (mRNA) is synthesized, which is complementary to the gene of interest. This is carried out in the nucleus of the cell where a region of the DNA unwinds and the two strands separate. The gene's DNA code is then transcribed to form the complementary stand of mRNA.
After transcription, the next step is translation. Here, the codons (triplets of nucleotides) on the mRNA are translated using another type of RNA called transfer RNA (tRNA) into a sequence of amino acids. This happens in the ribosomes, the 'desk', where the mRNA sequence is read and translated into the amino acid sequence of the protein that it encodes. This two-step process is collectively referred to as gene expression or the central dogma of molecular biology.
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Scientists believe the first giraffes on Earth had shorter legs and a shorter neck than giraffes today. What can you conclude about these first giraffes?
Answer: Survival of the fittest
Explanation: There where not many trees in the plains and with so many Giraffes roaming around with little predators, food was hard to come by. As the lower branches started thinning out, only the taller giraffes could reach the higher branches. When there was no food left, the shorter Giraffes started to die off, leaving only the taller giraffes. This is known as Survival of the Fittest because only Giraffes with the taller gene where able to survove. The shorter gene is extinct now becasue they no longer had food to live off of.
Answer:
Usattestpred Answer:
They had food sources that were low to the ground
Explanation:
I did it?? I got 100 percent..
A scientist wants to observe the structure that joins a cell to neighboring cells. How should the scientists observe the detailed structure of the cell
They need to use a microscope
Answer:
The scientist should use an electron microscope.
Explanation:
which is the SI base unit of mass
The SI base unit of mass is the kilogram (kg), which was historically based on a physical object but has been redefined in 2019 in terms of the Planck constant to maintain its stability over time. A kilogram is about 2.2 pounds, and a gram is 1/1000th of a kilogram.
Explanation:The SI base unit of mass is the kilogram (kg). Historically, it was defined by a platinum-iridium cylinder, known as the International Prototype of the Kilogram (IPK), which was stored at the International Bureau of Weights and Measures near Paris. However, in May 2019, the definition was revised and is now based on fixed numerical values of the Planck constant and other fundamental physical constants. This redefinition ensures that the unit will remain stable over time, unlike the IPK which could lose or gain atoms, and thus mass, over time.
Laboratories commonly use balances for measuring mass, which must be calibrated using a standard mass to ensure accuracy. The kilogram is pivotal in making mass comparisons because all other masses are ultimately compared to it. As of 2019, with the advancement in science and technology, a more accurate way of defining a kilogram using the Kibble balance and Planck's constant has been adopted.
A kilogram is equivalent to about 2.2 pounds, and a gram is exactly 1/1000th (10-3) of a kilogram. These measurements fall under the metric system widely used in scientific and engineering contexts.
Why does the moon appear to shine its own light?
--
A. The moon glows from inside its interior.
B. The moon reflects light from Earth.
C. The moon's atmosphere reflects solar radiation.
D. The moon's surface reflects sunlight.
The answer is D. The moon’s surface reflects sunlight.
The moon appear to shine its own light because the moon's surface reflects sunlight which is in option D as moon does not emit its own light like a star. Instead, it appears to shine because it reflects sunlight.
The intensity of the moon's reflected light can vary depending on factors such as the moon's position in its orbit and the angle at which sunlight hits its surface. This is why the moon appears to change in brightness throughout its lunar cycle, which we observe as the different phases of the moon. It's important to note that the moon's atmosphere is extremely thin compared to Earth's atmosphere, and it does not have the ability to scatter or reflect sunlight in the same way Earth's atmosphere does.
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Answer the question about the food web shown below.
What will most likely happen if the population of beetles drops suddenly?
Answer: C. Coatis will eat more figs.
Explanation:
A food chain is a sequence of distribution of energy in the form of food. In a food chain one organism is consumed by another organism. A food web forms when two or more food chains are interlinked.
According to the given food web, the strangler fig is eaten by the beetles and coatis. If the population of beetles declines the competition for the same source of food that is strangler fig will reduce between the two species of beetles and coatis. Hence, coatis will eat more figs if the population of beetle decline or drop.
Answer:
Coatis will eat more figs
Explanation:
Drag the tiles to the correct boxes to complete the pairs.
Match each nutrient to it’s primary function in the body.
-carbohydrates
-proteins
-fats
-vitamins
1.acts as antioxidants
2.provide a quick source of energy for cells and tissues
3.form tissues, growth factors,and hormones
4.form structural components of the cell membrane
Carbohydrates is 2
Proteins is 4
Fats is 3
Vitamins is 1
Answer:
- Carbohydrates is provide a quick source of energy for cell and tissue.
- Proteins is form tissue, growth factors and hormones
- Fats is form structural components of the cell membrane
- Vitamins is acts as antioxidants
The stem is responsible for providing support to the plant. A is a type of stem that grows underground. It is capable of asexual reproduction and food.
Answer:
Rhizome
Explanation:
Rhizomes are stems that are grown underground
Capable of asexual reproduction (producing an organism identical to the parent)
also produces food (many used in cooking like tumeric and ginger)
Answer:
The correct answers for Plato are 1)B. Rhizome and 2)A. Storing (:
Classify the organisms based on how they obtain food.
2
Autotroph
Heterotroph
On Plato/Edmentum?!
Answer:
A Heterotroph derives its nutritional requirements from complex organic substances.
A Autotroph derives its nutritional requirements from simple organic substances.
Explanation:
Answer:
AUTOTROPH: trees, algae carrots
HETEROTROPH: tiger, deer, human
Which of the following processes is decreased when many trees are removed from an area?
Answer:
Option (C)
Explanation:
When many trees are removed from any area, the area becomes dry and gets adversely affected. Due to the lesser amount of trees, the area will evaporate more due to its dry and increasing temperature, as a result of which there will be more precipitation. This precipitation will lead to more amount of surface runoff over the area. So the transpiration will simultaneously decrease as the plants will not be able to absorb water by its roots, that regulates the overall temperature of the plant and protects it from dying.
Thus, the transpiration process is directly proportional to the number of plants and trees in any area.
Thus, the correct answer is option (C).
Select the odd one out: jackal-crow-hyena-vulture
The odd one out would be the crow
The crow is the odd one out in the group because it's a bird capable of flying, unlike the jackal, hyena, and vulture which are terrestrial mammals.
Explanation:The odd one out of the group comprised of a jackal, a crow, a hyena, and a vulture is the crow.
This is because the crow is a bird while the jackal, hyena, and vulture are all mammals. Furthermore, the crow is the only one in the group that is capable of flight. The jackal, hyena, and vulture, on the other hand, are terrestrial animals.
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Which statement is true of magnets?
Answer:
The answer would be B. Earth is an electromagnet.
Explanation:
The Earth is a giant electromagnet. It's electromagnetic field is generated from the currents of electricity coming from molten metal flowing in the outer core of our Earth. The heat from the inner core causes convection and that is how electric current flows within Earth.
Answer:
A magnet always has two poles.
If you find a rock that has both a nautilus and a goniatite fossil, about hold is the rock? How do you know?
(This is some information within the lesson)
Nautilus: 410 million years ago - present day
Goniatite: 360 - 290 million years ago.
Answer:
The rock will be old between 360 and 290 million years
Explanation:
If we have fossils from both nautilus and goniatite in the same rock layers, then we can look at the periods in which these two animals lived as a clue about the age of the rocks, thus the animals themselves as well. The nautilus occurs in the fossil records around 410 million years ago, but it is not extinct, in fact it still exists and it is one of the oldest species on the planet. The goniatite has had different story, as it existed for around 70 million years, between 360 and 290 million years ago. We can see from this information that these two organisms coexisted throughout the whole existence of the goniatite, thus the rocks can have an age of anywhere from 360 to 290 million years.
Scientists can estimate more accurately at what point various groups of organisms diverged evolutionarily from one another by using which source of information?
Answer: DNA evidence
Scientists more accurately estimate the point of divergence in evolutionary relationships using molecular clocks and phylogenetic trees constructed from morphology, fossil records, and genetic data, which can include DNA analysis and protein sequence comparison.
Explanation:Estimating Divergence in Evolutionary RelationshipsScientists can estimate more accurately at what point various groups of organisms diverged evolutionarily from one another by using molecular clocks and analyzing phylogenetic trees. Molecular clocks use DNA sequences to estimate relatedness among species and determine when species diverged from a common ancestor. Phylogenetic trees are constructed using combined data from morphology, fossil records, and genetic information. These trees represent hypotheses of evolutionary relationships, and they continue to evolve with new discoveries and data.
By identifying homologous characteristics—traits that are similar due to shared ancestry—scientists can discern evolutionary connections between organisms. Using techniques like cladistics and applying the concept of maximum parsimony, scientists can determine the evolutionary timeline that suggests the simplest and most probable path of divergence.
Comparative data from the fossil record and molecular structures, such as DNA nucleotide sequences or amino acid sequences in proteins, enhance the accuracy of these estimates. Moreover, evolutionary investigations combine morphologic and genetic evidence to uncover the evolutionary history of life forms, contributing to the broader understanding of the 'tree of life.'
to find the main idea of a piece of writing,you can employ the techniques in which you?
Answer:
The main idea in a given piece of reading is implied by the introductory paragraph, and, or several meaning sentences that are in subsequent paragraphs.
Explanation:
The main ideas in the a given piece of work, specifically reading is contained in the first paragraph of the piece of writing. The first paragraph can be used to imply the main ideas in a topic without necessarily revealing it. The first concepts, terms, illusion and characters mentioned, certainly we can deduce the main idea.
Several sentences in paragraphs that carry almost similar, related and interrelated facts, in most cases are very essential in explaining the main idea. By looking at them in various paragraphs, one is able to find the sole message being communicated.
While reading a novel, Raoul isn't easily distracted by the sounds of the television or even by his brothers' loud arguments. This best illustrates
Raoul's ability to read without being distracted by environmental noise illustrates selective attention, which is a cognitive skill allowing someone to focus amid distractions.
The situation described where Raoul isn't easily distracted by the sounds of the television or his brothers' loud arguments while reading a novel best illustrates selective attention. This cognitive process allows individuals to focus on a specific stimulus while ignoring others. It's akin to what's often promoted in the twenty-first century as a way to combat the 'new attention economy', where our attentiveness is constantly challenged. Selective attention can be seen as a form of mindfulness training, allowing an individual to manage their focus in a world full of distractions.
Why are fat cells so much larger than red blood cells
Final answer:
Fat cells are larger than red blood cells because they store energy as fat, which takes up significant space within the cell, while red blood cells are small and shaped to efficiently transport oxygen.
Explanation:
Fat cells, or adipocytes, are much larger than red blood cells due to their function in the body. Adipocytes are specialized to store energy in the form of fats; they contain large fat droplets that occupy most of the cell's volume. In contrast, red blood cells, or erythrocytes, are designed to maximize their oxygen-carrying capacity. Erythrocytes are small and have a biconcave shape to increase the surface area for oxygen transport. They lack a nucleus and most organelles to provide the maximum space for hemoglobin, the protein that binds to oxygen.
Besides serving as energy reserves, adipose tissue offers insulation from cold temperatures and mechanical protection. The adipose tissue, rich in capillaries, allows for rapid mobilization and storage of fat molecules. In contrast, erythrocytes are designed for a different purpose entirely—they transport oxygen through the blood to various parts of the body and are produced in the marrow of bones, living for about 120 days before they are destroyed.
osmosis involves which of the following processes
Answer:
Movement of water from it higher potential to its lower potential.
Answer:
Osmosis is the chemical process.
Explanation:
Osmosis is the chemical process, where the solution moves from higher concentration to lower concentration through a semipermeable membrane. Osmosis may be slow or reversed, where the movement of solution is occured against the concentration gradient, from lower to higher concentration. Osmosis is similar to diffusion. Diffusion follows the same process as in osmosis without semipermeable membrane.
There are three types of osmotic solution:
Isotonic = Water moves in and out of the cell at an equal rate.
Hypotonic = Water moves into the, making it swell.
Hypertonic = Water moves out from the cell, like a raisin.
The cells of plants and animals are similar, except for a few different structures. Which structures are only found in
plant cells?
Jill has decided that she wants to start conserving gasoline. Jill is concerned about the rising price of gas, as well as how the by-products from gas engines pollute the atmosphere.
What solution would help Jill solve this problem?
Jill should start building a renewable energy resource plant. What this means is that she should find the right people to convert by-products of gas into usable energy in a particular community. To solve her problem, she must also find statistics and studies on atmospheric pollution in order for her to find the right equipment to start conserving gasoline.
Answer:
Deciding to ride her bicycle to and from work, instead of driving.
Explanation:
Correct answer
Lava plateaus form when _____.
Answer:
Lava plateaus for when a large amount of highly fluid lava flows over an area
Answer:
Lava plateaus form when lava flows over an area
Explanation:
When lava flows over an area a wide flat surface called lava plateau is formed.Lava is molten rocks that are formed deep in the surface of the Earth where temperatures are very high and can melt rocks.The lava can flow to cover a large area of land and solidify to create the plateau.An example is the Colombian plateau in the United States.
Mice eat corn. Hawks eat mice. Which term describes hawks in this food chain?
quaternary consumer
primary consumer
tertiary consumer
secondary consumer
Answer:secondary consumer
Explanation:the corn is the producer, the mice are the primary consumers and the hawk is the secondary consumer. I THINK.
Answer:tertiary consumer
Explanation:
Which causes natural selection to occur?
A-populations below the carrying capacity
B-a lack of competition
C-the presence of predators
D-unlimited resources
Answer:
c. Presence of predators
Explanation:
The presence of predators can cause natural selection to occur. In the presence of predators, individuals with advantageous traits such as faster speed, better camouflage, or stronger defenses are more likely to survive and pass on their genes to the next generation. Hence option c is correct.
What is natural selection?Natural selection is the process by which certain traits or characteristics become more or less common in a population over time due to their impact on survival and reproduction.
As a result, the frequency of these traits increases in the population, leading to an overall change in the population's genetic makeup.
The mechanism of natural selection was first proposed by Charles Darwin as part of his theory of evolution by natural selection. Darwin observed that individuals in a population vary in their traits, and those with traits that help them survive and reproduce are more likely to pass on their genes to the next generation.
Over time, this can lead to the evolution of new species, as advantageous traits accumulate and become fixed in the population.
Therefore the correct option is C the presence of predators.
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How do adult stem cells differ from embryonic stem cells?
A. Adult stem cells have high healing potential, and embryonic stem cells have low healing potential.
B. Adult stem cells can only be used by adults, and embryonic stem cells can only be used by babies.
C. Adult stem cells have unipotency, and embryonic stem cells have pluripotency.
D. Adult stem cells have totipotency, and embryonic stem cells have multipotency.
Answer:
C
Explanation:
Adult stem cells can only differentiate to form a single type of cell.
Embryonic stem cell are pluripotent as they can differentiate into any cell types except extra embryonic membranes like placenta.
Only zygotic stem cells are totipotent
Adult stem cells differ from embryonic stem cells as Adult stem cells have unipotency, and embryonic stem cells have pluripotency.
Difference between Unipotency and Pluripotency:Unipotency: A unipotent cell is that one stem cell that has the capacity to differentiate into one cell type only.
Pluripotency: pluripotent cell that has the potential to differentiate into any cell of the three germ layers i.e endoderm ( stomach lining, gastrointestinal tract, the lungs etc), mesoderm (muscle, bone, blood, urogenital etc), or ectoderm (epidermal tissues and nervous system etc), but not into cells of extra-embryonic tissues like the placenta.
Adult Stem Cells are unipotent that is they can develop only one type of cell but Embryonic Stem Cells are pluripotent, Hence, can develop into any cell type.
therefore option c is correct.
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What are the genotypes of the parents in the monohybrid cross below if the following offspring genotypes are predicted?
A) Tt and Tt
B) TT and tt
C) Tt and TT
I can't see the picture. If you resend the picture then I can answer it.
water is considered the universal solvent because is can dissolve
Answer: Polar substance, it dissolves polar substances, also called hydrophilic.
Explanation:
Water is a polar molecule and forms hydrogen bridges. Water is considered the universal solvent because it has great dissolving power. As water is a Polar substance, it dissolves polar substances, also called hydrophilic. Nonpolar substances, like oils, are hydrophobic and do not mix with water. The water is cohesive. Due to the formation of hydrogen bridges, water molecules attract strongly, keeping the substance stable. Also, water attracts other polar molecules, an association mechanism. That's why water wets polar materials like cotton and paper.