Answer:
1,2,4
Explanation:
The possible sources of error include: not cleaning the beakers properly, reusing droppers for different solutions, and not cleaning the outside tubing after filling with starch.
What are semi-permeable membranes?Semi-permeable membranes are materials which are selectively permeable to some substances but not others.
Starch molecules are large and do not pass through semi-permeable membranes.
The source of errors could be due to:
not washing the outside of the tubing after filling it with starchreusing droppers for different solutionsusing a beaker that had not been cleanedthoroughlyTherefore, Semi-permeable membranes are selectively permeable to some substances such as one but not larger molecules such as starch.
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Protozoans (animal-like) because they can gather food and ________
Answer:
How are they animal like?
Explanation:
Answer:Water
Explanation: I'm Smart
What roles do the thymus, thyroid, and parathyroid glands play in the human body? Check all that apply.
They regulate sugar in the blood.
They regulate calcium in the blood.
They regulate metabolism in the blood.
They attack pathogens.
Answer:
They regulate calcium in the blood.
They regulate metabolism in the blood.
They attack pathogens.
Explanation:
Answer:
They regulate calcium in the blood.
They regulate metabolism in the blood.
They attack pathogens
2,3, and 4
Explanation:
i got it right
Which of the following best describes an ecosystem?
A. a Group of populations that interact with in the same area.
B. a group of communities in their habitat
C. a group of organisms of the same species that live in the same area
D.a group of communities that interact within the same area
Answer:
D. a group of communities that interact in the same area
Explanation:
hope this helps!
Ecosystem refers to a group of communities, which associate with each other within the same region.
EcosystemIt is a community of living and non-living things, which work in harmony.
It comprises biotic components, that is, flora and fauna, and abiotic components, that is, water, soil, and air.
There is no specific size of an ecosystem.
The prime components of an ecosystem are water, plants, air, animals, soil, and light, they all function together.
A healthy ecosystem possess ample of species and is less likely to be destructed by human activities, climatic changes, and natural disasters.
Thus, the correct answer is option D.
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Under the influence of gravity, over time the dense central part of a galaxy will do what?(1 point)
expand
stay as it is, forces balanced
stay the same size but spin more slowly
contract
Answer:
D
Explanation:
Under the influence of gravity, over time the dense central part of a galaxy will:
contractGravity is the magnetic force of matter that enables something that goes up, in the earth's atmosphere, to come down, because of the magnetic pull.When the dense central part of a galaxy is under the influence of gravity, then it would contract.Therefore, the correct answer is option DRead more here:
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Question:
The macromolecules depicted in the image below make up a wall that surrounds the
outside of all cells. What type of macromolecule is pictured below?
a. Triglycerides
b. Nucleic Acids
C. Steroids
d. Phospholipids
Answer:
A
Explanation:
There was no picture but the cell membrane does surround the cell and it is a phospholipid bilayer made of triglycerides so it is answer choice A
Phospholipids disposed in a lipidic bilayer compose the cell membrane. Their hydrophilic heads are facing the exterior, and hydrophobic tails facing the interior. The answer is d. Phospholipids.
MEMBRANE COMPOSITION
The cell membrane is composed of two lipidic bilayers, cholesterol, proteins, and glucans incrusted in between.
⇒ LipidsPhospholipids are amphipathic molecules.They have hydrophilic heads facing the exterior and the interior of the cells and hydrophobic tails that arrange against each other in the interlayer space.Lipids can easily change places with other lipids by lateral diffusion in the same layer.They can diffuse transversally to the other layer but not as easily as lateral diffusion.There are also other lipidic movements as rotational diffusion that imply the rotation of the molecule.⇒ CholesterolThese molecules are incrusted in the membrane between the hydrophobic tails of lipids.
⇒ ProteinsAmong the proteins, we can find integral proteins and peripheric proteins.
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Fill in the blank with north or south
A compass always points to Earth's true North Pole because the north pole of the magnet in the compass is attract
to Earth's is close to the magnetic pole
Help
Answer: south
Explanation: I just took the test I hope this help ✌️
A theory is an explanation that has
A. no evidence to support it
B. little evidence to support it
C. much evidence to support it
D. been proven beyond a doubt
please help me ASAP!!!
Answer: B. Little evidence to support it
Explanation: Think about theory vs. law. Laws require a lot of evidence to back up and make a solid law. Theories are designed to change with new evidence found on the topic.
Please answer ASAP
Which of the following best defines metabolism?
Choose 1 answer:
A.) Any process that requires energy
B.) A reaction that breaks down large substances into smaller ones
C.) The process of building complex molecules from simple molecules
D.) The complete set of reactions carried out by a cell
Answer:
The answer is B.
Explanation:
Metabolism is the process where large molecules are broken down into smaller molecules to obtain energy.
The statement 'the complete set of reactions carried out by a cell' BEST defines metabolism (Option D).
Metabolism refers to all chemical reactions that cells perform to carry out their functions (e.g., growth, differentiation, reproduction, etc).
Metabolic reactions can be divided into anabolic reactions and catabolic reactions.
Catabolic reactions are metabolic reactions that break down large molecules into smaller molecules, thereby releasing energy.
Anabolic reactions are metabolic reactions that synthesize large molecules by using smaller molecules, thereby consuming energy.
In conclusion, the statement 'the complete set of reactions carried out by a cell' BEST defines metabolism (Option D).
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(Plz help)
At which point on the graph displaying human population growth would factors like drought and fires likely have the greatest impact
in growth rate?
Between points A and B
Between points B and C
Between points C and D
Equally at any point on the graph
Points between B and C displaying human population growth would factors like drought and fires likely have the greatest impact in growth rate.
What do you mean by growth rate?The term “growth rate” describes the rate of change in the value of a specific metric across a given time period, expressed as a percentage. Common examples of scenarios where the growth rate is often used are the following: Company Sales. Population.
Moreover, growth rates are computed by dividing the difference between the ending and starting values for the period being analyzed and dividing that by the starting value.
Therefore, the growth rate of a value (GDP, turnover, wages, etc.) measures its change from one period to another (month, quarter, year). It is very generally expressed as a percentage.
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What is the acceleration of a 50 kg object pushed with a force of 500 newtons
Force is equal to mass times acceleration, therefore acc. is equal to Force divided by mass.
500 N /50kg equals 10m/s^2.
The acceleration of a 50 kg object pushed with a force of 500 Newtons is 10 m/s^2, calculated using Newton's second law of motion.
Explanation:To calculate the acceleration of an object, we use Newton's second law of motion, which states that the force acting on an object is equal to its mass multiplied by its acceleration (F = ma). If a 50 kg object is being pushed with a force of 500 Newtons, you would solve the equation for acceleration, a = F/m. Thus, a = 500N / 50kg = 10 m/s^2.
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List some cell types in which mitosis is expected to occur. List a cell type in which meiosis is expected to occur.
Explanation:
i know that mitosis is a skin cell
what evidence did darwin use to support his theory of evolution?
1. Some bloodsucking insects insert their mouthparts directly into a blood vessel and withdraw biod. Other
bloodsucking insects have mouthparts that cut through the skin and blood vessels, and produce a small poslo
blood from which they feed. Both mouthparts types are specialized for:
a autotrophic nutrition b. heterotrophic nutrition c regulation d excretion
Answer:
The answer is heterotrophic nutrition because mosquitoes depend on your blood for survival, and autotrophic nutrition is for plants! Hope this helps! Stay safe and don't get coronavirus!
Explanation:
If the DNA nucleotides read 3'-ATG-CGT-GAC-5', the amino acid sequence of the resulting polypeptide
(protein) would be what?
Answer:
5’ – TAC-GCA-CTG-3’
Explanation:
As per the Chargaff’s complementary base pairing rule purine always pairs with a pyrimidine.
Purines include adenine (A) and cytosine (C)
Pyrimidine include thymine (T) and guanine (G)
Thus an A always pair with T and C always pair with G
Thus, the resulting poly peptide for the given amino acid sequence is
3'-ATG-CGT-GAC-5'
5’ – TAC-GCA-CTG-3’
2. When you decrease the pH in the simulation, the ocean's acidity increases. What do you expect
to happen over time to the population of the corals, algae, and fish in the coral reef as the pH of
the ocean decreases?
Answer:
With decrease in pH of ocean water, the survival rate of corals, algae, and fish in coral reef reduces.
Explanation:
Coral reefs find difficulty in living in acidic ocean water. It is so because the coral’s shell that is made up of calcium carbonate is unable to sustain in acidic environment.
Not only this the skeleton of snails, clams, algae , fish etc is also made up of calcium carbonate. Increased acidity leads to death of these species.
Thus, the lower is the pH of ocean water, the higher is its acidity and hence the lower is the probability of survival of corals, algae, and fish in the coral reef
pH is among the limiting factors that might affect coral, algae and other species. A decrease in water pH causes an increase in acidity, which leads coral, algae, and fish in the coral reef to death.
What is the relationship between corals and algae?
Corals are translucid or white, but they look brightly colored because they host symbionts with colorful photosynthetic pigments . They can host different organisms that live on and among them, giving place to an amazing ecosystem.
One of these organisms is the photosynthetic unicellular microalgae, called zooxanteles. Corals provide shelter and protection to the algae, while algae provide nitrogenated nutrients, sugars, and color to the corals.
This symbiotic relationship allows corals to grow in different environments that are poor in nitrogen or other nutrients, such as the tropical clear waters.
What are the limiting factors of corals and algae?Limiting factors are environmental conditions that act directly on populations and individuals, limiting their distribution and growth.
Some of these factors are water, temperature, pH, salinity, and radiation.
When changes in any of these factors occur, corals react to these changes losing these algae and becoming translucid again.
pH is a significant limiting factor for coral survival because their calcium-carbonated shell is sensitive to acidic environments.
When there is a decrease in oceanic pH, occurs an increase in water acidity, causing coral, algae, and other organisms death.
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Matt is an owner of a sugar factory. His factory produces tons of starchy residues. What can Matt do with it?
A.
dump the residue into the ocean
B.
convert the residue into bioethanol
C.
burn all the residue
D.
mix the residue with raw material to produce more sugar
Matt can convert the residue into bioethanol .
The correct option is B.
Explanation:
The starchy residue of the sugar can be fermented to alcohols as bioethanol to be used as fuel.
The fermentation process is carried out by bacteria Saccharomyces cerevisiae in anaerobic conditions.
In the process of fermentation of starchy residue apart from bioethanol some medical useful compounds and alcholol derivatives were also obtained as by products.
Though used as fuel it has lower energy than gasoline.
Bioethanol is a biodegradable and non-toxic fossil fuel.
The biomass waste of sugar industry is used for making fuel as bioethanol.
Answer:
Answer is B
Explanation:
What did Thomas Addison have to do to make a lightbulb work
Answer:
use electricity to make a spark in the bulb and light it
Explanation:
A Punnett square is used to predict the potential offspring from a cross. true or false
Answer:
true
Explanation:
QUESTION 17 Which of these has an elliptical orbit around the sun? Earth Jupiter Mars Earth, Jupiter, and Mars
Answer:
Earth
Explanation:
Answer:
earth
Explanation:
Earth moves around the Sun in an elliptical orbit. Earth's orbit is almost a perfect circle; its eccentricity is only 0.0167.
Identify structure A.
Identify structure B.
Identify structure C.
Identify structure D.
3209-03-07-20-02
Answer:1.a 2.b 3.c 4.d
Explanation:
i did it on e2020
Answer:
1.a 2.b 3.c 4.d trust me
Explanation:
Which of the following planets has methane clouds in the atmosphere?
Answer:
uranus
Explanation:
because they do
Answer:
uranus
Explanation:
its hard to explain so i just ask please trust me
mark me brainliest please
How do you think scientists count the world’s human population?
Answer:
Scientist count the world humans population with an organization called The United Nations Population Division (UNPD),
Explanation:
Which keeps track of the world population, projects that the world's human population will hit 7 billion on Halloween Day 2011. Admittedly, that is just an estimate: There's no way to know exactly how many people are alive at any given moment, and the true date that humanity's ranks will surpass 7 billion could come in the weeks or months before or after Oct. 31. Nonetheless, the UN's guess is the best there is.
What are the factors of the polynomial?
O (2x+3)(x+1)
(2x-3)(x-1)
(3x+2)(x+1)
(3x-2)(x-1)
ELLER
El
The factors of the polynomial is (3x+2)(x+1). The correct option is C.
What is polynomial factorization?Factorization of polynomials, also known as polynomial factorization, is the process of expressing a polynomial with coefficients in a specified field or in numbers as the product of independent factors with values in the same domain.
Thus, the correct option is C, (3x+2)(x+1).
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RGY CONCEP
ESSENTIAL QUESTIONS
• How do Earth's land
biomes differ?
Answer:
. A biome is a specific geographic area notable for the species living there.
Explanation:
Each biome can be classified because of the animals and plants that live there. Basically, they differ by the living and non-living things that make up the biome.
which of the following states correctly describes the process of photosynthesis and cellular respiration
A. respiration creates a high level of carbon dioxide in the atmosphere
B. photosynthesis and respiration keep the levels of oxygen and carbon dioxide fairly constant in the atmosphere
C. photosynthesis creates a high level of oxygen in the atmosphere
Answer:
B. photosynthesis and respiration keep the levels of oxygen and carbon dioxide fairly constant in the atmosphere.
Explanation:
How does cloning effect the individuals???
What items on this list can not be recycled via curbside pick up?
cardboard
food boxes
plastic bottles
plastic bags
glass bottles
textiles
electronics
Answer:
electronics
Explanation:
it common sense
Which level in a food web contains the highest amount of total available energy?
A
primary consumer
B. Secondary consumer
C. decomposer
D. producer
Answer:
D. producers
Explanation:
This is because of a rule known as the 10% rule, in which every trophic level you go up, there is 90% less energy in that level
Which tatement gives an example of asexual reproduction?
A)A new potato plant grows from a potato.
B)Two worms mate and reproduce more worms.
C)An apple see is produced from pollinated flowers
D)Butterflies have genetic information from both parents.
Do robber crabs have more in common with dolphins or with sponges?
Answer:
humans
Explanation:
Robber crabs are excellent climbers