Answer:
A semi-permeable membrane is a type of biological or synthetic, polymeric membrane that will allow certain molecules or ions to pass through it by osmosis. The rate of passage depends on the pressure, concentration, and temperature of the molecules or solutes on either side, as well as the permeability of the membrane to each solute. Depending on the membrane and the solute, permeability may depend on solute size, solubility, properties, or chemistry. How the membrane is constructed to be selective in its permeability will determine the rate and the permeability. Many natural and synthetic materials which are rather thick are also semipermeable. One example of this is the thin film on the inside of the egg.
Explanation:
An example of a biological semi-permeable membrane is the lipid bilayer, on which is based on the plasma membrane that surrounds all biological cells. A group of phospholipids (consisting of a phosphate head and two fatty acid tails) arranged into a double layer, the phospholipid bilayer is a semipermeable membrane that is very specific in its permeability. The hydrophilic phosphate heads are in the outside layer and exposed to the water content outside and within the cell. The hydrophobic tails are the layer hidden in the inside of the membrane. The phospholipid bilayer is most permeable to small, uncharged solutes. Protein channels are embedded in or through phospholipids, and, collectively, this model is known as the fluid mosaic model. Aquaporins are protein channel pores permeable to water. Information can also pass through the plasma membrane when signaling molecules bind to receptors in the cell membrane. The signaling molecules bind to the receptors, which alters the structure of these proteins. A change in the protein structure initiates a signaling cascade. The G protein-coupled receptor signaling provides is an important subset of such signaling processes.
What characteristic of viruses distinguishes them from cells? They lack an independent metabolism. Their traits do not evolve in response to selection pressures. They are not separated from their environments. They do not have hereditary material.
Answer:
The correct answer is "They lack an independent metabolism"
Explanation:
Viruses are usually active/alive in a living environment and become inactive in non-living environment; these is because they rely on the metabolic activities of the invaded living environment/cell. This property is a sharp contrast to normal living cells that are able to metabolize different substances independently using several organelles.
Answer:
The do not have hereditary material.
Their traits do not evolve in response to natural selection.
They lack the ability to live independent of a host.
They are not separated from their environments.
Explanation:
I have the same question but different answers. Can you help
Which normal meiotic event would be the MOST LIKELY explanation for the mutation that causes Williams Syndrome? cytokinesis
Answer:
a
Explanation:
because
12. Why are lobe-finned fish thought to be the closest relatives to tetrapods?
Answer:
Lobe-finned fish are thought to be the close relatives to tetrapods because of the fact that the fins are very flexible and potentially useful for supporting the body on land, as in lungfish and tetrapods.
Explanation:
The lobe-finned fish are thought to be the closest relatives to tetrapods because the fins are very flexible and potentially useful for supporting the body on land, same as in the lungfish and tetrapods.
What are the lobe-finned fishes?
The lob-finned fishes are called as Sarcopterygii, is a clade containing the coelacanths, lungfishes, tetrapods, and the fossil relatives as well, including the osteolepiformes and panderichthyids. These are the sister group to the ray-finned fishes called as Actinopterygii, which together forms the bony fishes called as Osteichthyes.
The basic characteristics of lobe-finned fishes such as swim bladder, lateral lines, lobed fins, enameled teeth. Tetrapods are thought to have evolved from the primitive lobe-finned fish.
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in order to get rid of the agricultural insecticides in fruits it's advised to soak them in a diluted sugar solution?
Answer:
False
Explanation:
In order to get rid of the agricultural insecticides in fruits it's false to soak them in a diluted sugar solution. This won’t effectively remove the insecticides in the fruit.
It is usually advisable to use 2% salt solution In which cold Water should be used in order to achieve effective removal of the insecticide from the fruits to enable it fit for consumption.
(b) These crops can be used to feed farm animals.
Mineral ions are absorbed by the animal's gut.
This is because mineral ions are
Highlight the correct answer in yellow:
A small and soluble
B small and insoluble
C large and soluble
D large and insoluble
If a cell containing 5% salt is placed into a glass of water with 20% salt, the water is ______ compared to the cell.
A: hypertonic
B: none of the above
C: isotonic
D: hypotonic
Answer:
it would be A: hypertonic
If a cell containing 5% salt is placed into a glass of water with 20% salt, the water is hypertonic compared to the cell.
TONICITY:
Tonicity is the ability of a solution to induce movement of water in and out of a cell. Tonicity can either be hypertonic, hypotonic or isotonic in nature. Hypotonic solution is a solution that is lesser in solute concentration compared to the cellular solution while hypertonic solution is a solution that is greater in solute concentration compared to the cellular solution. This means that the glass of water with 20% salt is hypertonic (higher in concentration) to the cell containing 5% salt.Learn more about hypertonic solution at: https://brainly.com/question/8984839?referrer=searchResults
What is being broken down for energy during cellular respiration?
Plants
Glucose
Mitochondria
Carbon Dioxide
B: Glucose
Glucose is broken down for energy during cellular respiration.
Why do you think the starch molecule shown is a good source of energy for an organism?
A. The many bonds in the starch molecule store energy.
B. The starch molecule is made of atoms.
C. Starch is the only type of molecule that provides energy.
D. A starch molecule is made of more than one kind of atom.
Please help! I suck at Science!
Answer:
A
Explanation:
because it is known as a large molecule
The starch molecule is known as a good source of energy for an organism because the multiple bonds in the starch molecule are responsible for the storage of energy. Thus, the correct option for this question is A.
What is a Starch molecule?A starch molecule may be defined as a type of molecule that significantly consists of a chain of glucose molecules that are bound together in order to construct a bigger molecule, which is called a polysaccharide.
There are two types of polysaccharides present in the molecules of starch. They are as follows:
Amylose: It is a linear chain of glucose. Amylopectin: It is highly a branched chain of glucose.These long chains of glucose store a tremendous amount of energy during the synthesis of the starch molecules. Glucose provides instant energy while the breakdown of bonds in starch molecules takes time. So, the energy is liberated accordingly with a long-lasting effect.
Therefore, the multiple bonds in the starch molecule are responsible for the storage of energy. Thus, the correct option for this question is A.
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Which activity releases carbon into the atmosphere?
respiration
photosynthesis
decomposition
feeding
C or decomposition have a nice day! :)
If a planet in our solar system is a gas giant planet it is near the sun. If a planet in our solar system is a gas giant planet it is far from the sun. If a planet in our solar system is a gas giant then it is near or far from the sun. Which is correct?
Answer: I think it's If a planet in our solar system is a gas giant planet it is far from the sun
James is conducting an experiment to test the effect of insecticides on frogs. He gives one group of frogs 10 cc of the insecticide and 0 cc of the insecticide to the other group of frogs. After 5 days, the effects of the insecticide are collected. what is the independent variable and dependent variable
Answer:
Independent variable: amount of insecticide
Dependent variable: effects of insecticide on frogs
Explanation:
Dependent variable in a research experiment, is the variable that is being studied, tested and measured by the researcher, while the independent variable is the variable that causes the dependent variable to change, when it is varied.
In this case, the amount of insecticides that is varied in quantity, is the independent variable that the researcher manipulates, while the independent variable is the effects caused by these varied amount of insecticide on frogs, which is tested and measured.
Explain how tropical and polar climates differ.
Answer:
Okay.
Explanation:
Tropical climates are warm, bright, humid, and wet.
And Polar climates are cold, dry, and dark.
O 1) Genetics is the study of
Answer:
Genetics is a term that refers to the study of genes and their roles in inheritance - in other words, the way that certain traits or conditions are passed down from one generation to another. Genetics involves scientific studies of genes and their effects.
Explanation:
i have an iq of 216
Why don’t we have a complete fossil record of all life that’s ever lived?
Answer:
Why don't we have a complete fossil record of all life that's ever lived? Fossil formation requires a rare mix of physical and biological conditions. Fossils must be exposed at Earth's surface to have a chance of being found. Fossils can be destroyed when rocks erode, melt, or change composition.
Explanation:
For many reasons, the fossil record is not complete. Most organisms decomposed or were eaten by scavengers after death. Many species lacked hard parts, which are much more likely to fossilize. Some rocks and the fossils they contained have eroded and disappeared.
Please mark me as the brainliest
Answer:
Sediment has to cover the bones in order for fossilization to take place
Explanation:
Fossil formation requires a mix of physical and biological conditions. Fossils have to be exposed in oder to find them too, so there might be some that are just too deep in the earth for us to find them
BRAINLIST OPPORTUNITY
Which type of infectious agent causes athlete's foot?
O a virus
O a bacterium
O a fungus
O a parasite
Answer:c
Explanation:
The path that a body follows as it travels around another body in space is its
Answer:
orbit
Explanation:
The path that a body follows as it travels around another body in space is its ---- ORBIT
LOCATION What city was located in northern Mesopotamia?
Answer:
Assur is the answer for that question
Answer:
Assur
Explanation:
Because all living things are made of cells,
and you are a living thing, what kind of
cells are you made of?
(Prokaryotic or eukaryotic)
Answer:
eukaryotic
Explanation:
Well, there are some prokaryotic cells in the body, but mostly its eukaryotic, and the human body is categorized as eukaryotic organisms, because eukaryotic means that the cell has a nucleus, where prokaryotic cells don't.
his is how platinum appears in the periodic table.A purple box has P t at the center and 78 above. Below it says platinum and below that 195.08.
Rounded to the nearest whole number, what is the atomic mass of platinum?
78
117
195
273
Answer:
The answer is 195, the atomic mass is always the bottom number below the name of the element.
Answer:
195
Explanation:
i took the test on edge
A change in the way something reflects light; can indicate a chemical
change
Answer:
A change in the way something reflects light very well can indicate a chemical
change.
Do fungi have cilia, flagella or pseudopodia for locomotion?
i) Yes
ii) No
Answer:
Yes
Explanation:
Cilia and flagella are also known among plants and animals, although they are absent from the true fungi. In some protists, single cilia have, in effect, been replaced by compound ciliary organelles (e.g., membranelles and cirri), which may be used effectively in locomotion and feeding.
What is the primary source of the Van Allen Belts?
O The Outer Core
O The Inner Core
O The sun
O The mantle
Which of the following is true regarding the cell theory?
Answer:
cell theory had 5 guys that basically made up and copied other scientist ideas and hooke was the first to find a cell like in jail the prisoners have a cell
he was the first to discover it
Explanation:
How can a cell control the rate of an enzyme-catalyzed reaction?
Answer:
cells can control the rates of reactions involving these enzymes by regulating the movement of substrate molecules through the membrane. organisms may use hormones to carry messages from one part of the organism to another.
Explanation:
i hope that helps!
1 point
4. Bob rides his bike a distance of 54 miles in 4 hours. What is his speed in
miles per minutes? (Use the formula sheet below to determine the
equation you need to use.) *
I’m
7. Why is the property of specific heat important to aquatic life?
Answer:
Specific heat means amount of heat required to raise a temperature of a particular body, in case of aquatic life the specific heat plays an important role, the organisms living in an aquatic system require an certain body temperature to be maintained in order to survive.
Specific Heat raises the temperature of the water body resulting in Aquatic life to survive.
The genetic information is contained inside the cell's
Help please thx
Answer:
nucleaus
Explanation:
science class
Answer: nucleus
The genetic information that is stored inside the cell is in the center, where the nucleus is located. The nucleus stores all your parents' DNA.
Hope this answer helps!
Are endocytosis and exocytosis examples of passive transport or active transport?
Answer:
Yes, they are both active transport processes.
Explanation:
Exocytosis describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell. Both endocytosis and exocytosis are active transport processes.
Given that almost all organisms obtain energy from food by the process of cellular respiration, which is the most likely explanation for what prevents Earth from running out of oxygen?
Answer:
Oxygen cycles keeps the flow of oxygen at a constant rate.
Explanation:
The oxygen constitutes about 20% of the gaseous components in the atmosphere and it's being renewed continuously by the various microorganism and primary producers as green plants that use photosynthesis and converts the sunlight and carbon dioxide to water and releases oxygen. Oxygen cycle makes life possible as most of the elements are combined with oxygen in some way or another and are found on the lithosphere, hydrosphere, and atmosphere even biosphere hence its is present insufficient amounts.
Answer:
A.) The net effects of the reactions of photosynthesis and cellular respiration are the opposite of one another, therefore the products of one are the reactants of the other, creating a cycle.
Explanation: Hope this helps!!
3. Which of the following is a defining characteristic of a prokaryotic cell?
a. The method of cellular Respiration
b. The composition of the cell membrane
C. Absence of a membrane-bound nucleus
d. The method of movement
Answer:
C
Explanation:
Prokaryotic cells do not have any membrane-bound organelles, only eukaryotes do.
The prokaryotic cell is a simple primitive cell, unlike the complex eukaryotic cells. The absence of a membrane-bound nucleus is a characteristic of prokaryotes. Thus, option C is correct.
What is a prokaryotic cell?Prokaryotes have been the cells that have lived on earth for millions of years ago. They are made of single cells and hence are unicellular. Unlike the eukaryotic cell, they have simple mechanisms of living and reproduction.
They lack a centrally located defined nucleus that is not covered in any membrane and lies simply in the cytoplasmic material. Also, they lack organelles that make them different.
The genetic material is located in a concentrated form in a structure called the nucleoid that lacks a nuclear membrane.
Therefore, option C. the prokaryote lacks a membrane-bound nucleus.
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