When does facilitated diffusion occur?
Answer:
The word ‘diffusion’ means free movement across distance, with or without the presence of a barrier. However, there is a phenomenon known as facilitated diffusion which occurs at the cellular level. The cell does not allow free radicals and other harmful substances to enter and harm the cell organs.
Explanation:
Answer:
When certain large molecules are unable to move through the membrane without the help of channel proteins.
Explanation:
Facilitated diffusion occurs when large molecules that are unable to pass through a membrane on their own make use of channel proteins to move from one side of the membrane to the other. Facilitated diffusion can occur when a liquid on one side of a membrane has a higher osmotic pressure than a liquid on the other side of the membrane, but it isn’t a required feature of facilitated diffusion. Similarly, facilitated diffusion can occur when there’s a large membrane potential present, but it isn’t a required feature of facilitated diffusion. Facilitated diffusion doesn’t require the use of energy, so the presence of ATP is irrelevant to facilitated diffusion occurring.
A beaker contains 0.64 L of water. What is the volume in milliliters?
0.64 L in milliliters is 640 milliliters.
Autotrophs make glucose during _____.
Answer:
photosynthesis (autotrophs are mainly plants )
If a female lion runs a distance of 469.2 meters while chasing an antelope, how many millimeters did she run?
Answer:
the lion ran 469200 millimeters
Explanation:
469.2 x 100 = 469200
Which of the following occurs just before the cell enters the G2 stage of
the cell cycle? *
O The nuclear membrane disintegrates.
O DNA replicates
O Centrioles form
O The nucleolus divides
Answer:
DNA replicates
Explanation:
S phase (Synthesis Phase) During this phase, the cell makes a variety of proteins that are needed for DNA replication. During S phase, which follows G1 phase, all of the chromosomes are replicated. Following replication, each chromosome now consists of two sister chromatids, the synthesis phase of interphase takes the longest because of the complexity of the genetic material being duplicated. Throughout interphase, nuclear DNA remains in a semi-condensed chromatin configuration
Which term defines a small, irregularly shaped body made of rock or organic material that orbits the sun
Answer:
Meteoroids is the answer.
Explanation:
New species develop when??? Please help!
Answer:
by speciation
Explanation:
new species from by speciation, in which an ancestral population splits into two or more genetically distinct descendant populations.
A group of students is studying the movement of thermal energy. The teacher asks the students to place the palms of their hands flat on tops of their wooden desks and describe what is happening. The teacher reminds the students that wood is a better conductor of thermal energy than air. Which statement is the best description of what is happening? Explain why.
1 point
The table feels cold because it is at a lower temperature than the air in the room.
The table feels cold because it is solid, and solids hold thermal energy better than air.
The table feels cold because it is at a lower temperature than the students’ hands and thermal energy is being pulled into the table.
The table feels cold because it is at a lower temperature than the students’ hands and thermal energy is being pulled into the students’ hands.
Answer:
A
Explanation:
Because i did this test
Answer:
A
Explanation:
Because when the room gets cold the table gets cold with it butr when it warms bakc up it takes longer
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Answer:
The answer is C.
Explanation:
Question 9 of 10
How does an atom become a positive ion?
A. It loses an electron,
B. It loses a neutron,
C. It gains an electron
D. It gains a neutron,
SUSAN
Name the 3 cell surface protiens.
Answer:
There are three kinds of carrier proteins, uniport, symport, and antiport.
Explanation:
Answer:
integral, peripheral, and lipid
Explanation:
Which is the final event that occurs when a star is forming?
Answer:
the outer layer of the star expands
Explanation:
Gravity pulls gas and dust together. A protostar forms as mass increases. A black hole forms as the core collapses.
Answer:
Hence, the final event that occurs when a star is forming is that nuclear fusion begins under high pressure.
Explanation:
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When focusing a specimen it neccessary to focus on the lowest magnification first before switching to higher magnification. why do you think this is important?
Explanation:
the lower power will focus betterthan the high magnification
The siboglinid tube worm, found at deep-sea hydrothermal vents and cold seeps, has no digestive tract. It relies on symbiotic bacteria that live in the tube worm’s tissues. The bacteria oxidize hydrogen sulfide or methane for the worm.
What type of relationship is this?
Answer:
mutualism
Explanation:
There is a mutual benefit in both parties.
The relationship between the siboglinid tube worm and the symbiotic bacteria that live in its tissues is an example of mutualism, a type of symbiotic relationship in which both organisms benefit from the interaction.
What is a mutualistic relationship?In a mutualistic relationship, both organisms benefit from their interaction with each other. This is different from parasitic or commensal relationships, where one organism benefits at the expense of the other, or where one organism benefits while the other is neither helped nor harmed. In the case of the siboglinid tube worm and the symbiotic bacteria that live in its tissues, the tube worm benefits from the bacteria's ability to oxidize hydrogen sulfide or methane, which provides the worm with a source of energy and nutrients. This is important because the tube worm has no digestive tract of its own and cannot obtain food directly from the environment.
Hence, the relationship between the siboglinid tube worm and the symbiotic bacteria that live in its tissues is an example of mutualism.
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Forests are considered nonrenewable resources primarily because of the.
Choose the correct answer.
a. difficulty in engineering wood alternatives
b. challenge to harvest fibers from other plants
c. demand for wood in a wide variety of products
d. decreased need for wood products in manufacturing
Answer:
c
Explanation:
we use wood faster then the trees can grow
Answer:
c. demand for wood in a wide variety of products.
Water lilies grow in freshwater ecosystems. When a water lily plant is kept in seawater, it wilts. Which statement best describes what happens to the water lily plants in seawater?
a.Water moves out of the cells of the lily by osmosis
b.Water moves into the cells of lily by osmosis
c.The cells of water lily plants get less oxygen from the seawater
d.The cells of water lily plants lose all important nutrients to the seawater
IN A TEST RN!!!!
I’m snapdragons flower color is controlled by incomplete dominance...
According to Chargaff's rule, base pairing in DNA should resemble which of the following?
A = T; C = G
A = C; T = G
A = G; T = U
A = U; C = G
The Char gaff rule is all about the number of adenine is equal to the number of thymine and with that the number of cytosine is equal to the number of guanine. The correct answer is option B.
What are the types of bonds that are present in between these nitrogenous bases ?The kind of bonds that are present in these nitrogenous bases are hydrogen bonds. A binds with T with two hydrogen bonds and C binds with G through 3 hydrogen bonds.
It is all about that the number of purines is equal to the number of pyrimidines. The number of adenine molecule are present totally in equivalence to the number of thymine molecules.
The number of guanine molecules are present in the molecule of DNA are totally in numbers to the cytosine. In place of thymine uracil is present which is present in RNA.
Therefore, The Char gaff rule is all about the number of adenine is equal to the number ofThe Char gaff rule is all about the number of adenine is equal to the number of thymine and with that the number of cytosine is equal to the number of guanine. The correct answer is option B.
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Aphids are tiny insects that feed on plants. Ladybugs are helpful to plants because they eat aphids.
Which type of organism are aphids in this scenario?
decomposers
predators
prey
producers
Answer:
Prey
Explanation:
The aphids are the prey of the ladybug.
Answer:
c
Explanation:
The measure of the mass of an atom is called ________.
Question 1 options:
isotope
proton
energy
atomic mass
Answer:
D
Explanation:
When fresh river water meets the salty ocean the waters do
a
They have different densities.
They form layers.
The fresh water floats on the salt water.
All of the above.
How do i know if its entering or leaving or neither just by the precentage?
Answer:
1. Shrink
2. Swell
3. Neither
Explanation:
The percentage of water indicates how pure the water is, i.e. how concentrated the molecules of water are.
The higher the percentage of water, the more water molecules there are in the space.
Water molecules move from a high concentration to a low concentration across a semi permeable membrane, by the process of osmosis.
In beaker 1, the water outside is 89%, and inside the bag is 92%. That means the water inside the bag is at a higher concentration than outside. That means water will leave the bag, moving from a high concentration to a lower concentration outside. The bag will shrink.
In beaker 2, the water outside is 97%, and inside is 92£%. That means the water inside the bag is a lower concentration than outside. That means water will enter the bag, moving from a higher concentration outside to a lower concentration outside. The bag will swell.
In beaker 3, the concentration of water inside and outside is the same. That means they are in an equilibrium (the movement is balanced) so neither will occur
Which correctly lists three forms of frozen water?
O dew, frost, rain
O frost, hail, sleet
O hail, rain, sleet
Orain, dew, frost
Answer:
b
Explanation:
The option that correctly lists three forms of frozen water is "frost, hail, sleet". Therefore, option (B) is correct.
What is frozen water?Frost is created when water vapor condenses and freezes onto a surface, like the ground or a window.
Hail is produced when powerful updrafts in thunderstorms carry raindrops high enough that they freeze into ice, forming large balls of ice that fall to the ground. This process results in the formation of hail.
Sleet is created when raindrops pass through a layer of cold air close to the ground. This causes the raindrops to freeze into small ice pellets before they reach the ground's surface.
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In diffusion, molecules
spread out
condense
In diffusion,molecules spread out condense
Answer:
Spread out
Explanation:
If you were to spray perfume, you would be able to smell if you moved slightly away from where you sprayed it as the molecules have diffused.
Passive transport moves materials from high to low which is ______ the concentration gradient.
Against
Over
With
Around
Answer:
I think that it is with the gradient because it does not require energy to pass-through
How can temperature and pH affect enzymes?
Answer:
raising temperature generally speeds up a reaction, and lowering temperature slows down a reaction. extreme pH values can cause enzymes to denature.
enzymes work best within specific temperature and pH ranges, and sub-optimal conditions can cause an enzyme to lose its ability to bind to a substrate.
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what differentiates passive transport from active
(Answer choices in picture)
Answer:
I would say ATP is needed for active transport to occur
Which statement below best describes the purpose of meiosis in creating gametes?
The purpose of meiosis is to produce gametes, or sex cells. During meiosis, four daughter cells are produced, each of which are haploid (containing half as many chromosomes as the parent cell).
The purpose of meiosis is to create gametes. Thus, it reduces the number of chromosomes to half.
What is meiosis?In sexually reproducing organisms, meiosis is a kind of cell division that results in a reduction in the number of chromosomes in gametes (the sex cells, or egg and sperm). Body (or somatic) cells in humans are diploid, meaning they have two sets of chromosomes (one from each parent).
The egg and sperm that combine during fertilization must be haploid or have only one pair of chromosomes, in order to sustain this state. Each diploid cell divides twice during meiosis to produce four haploid daughter cells, which are gametes.
In humans, autosome cells contain 46 chromosomes, while gametes contain 23 chromosomes. Hence, the main purpose of meiosis is to divide the genetic material in half.
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what are key functional groups
What is the function of structure c ?
Answer:
Explanation:
Arrays allow to define type of variables that can hold several data items of the same kind. Similarly structure is another user defined data type available in C that allows to combine data items of different kinds.