A major type of lipid found in cell membranes is

Facilitated diffusion is necessary when cell membranes prevents a substance from diffusing on its own.

Facilitated diffusion is a type of passive transport that involves movement of solute materials down the concentration gradient.

Keywords: Passive transport, Diffusion, Osmosis, Passive transport

Level: High school  

Subject: Biology

Topic: Transport in living organisms

Sub-topic: Passive transport

Answer:

The enzyme has two effects on the substrate either break it down or built it up.

Explanation:

An enzyme is a biocatalyst that reduces the activation energy of chemical reactions.

Enzyme substrate follows the lock and key model.

Enzymes either bind with 2 substrates join them together or bind with a substrate and break it down.

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Answer:

Hydrosphere

Explanation:

All the glacial ice present on earth belongs to the hydrosphere. Hydrosphere represents all the water bodies (ice, vapor, and liquid) existing on earth.

Glaciers are the region where the temperature is low and continuous accumulation of snow takes place in consecutive years. In due course of time, these accumulated snow undergoes compaction as a result of which it subsequently forms ice.

The factors that are responsible for the formation of snow re s follows-

1) Areas of high latitude

2) Low temperature

3) Presence of abundant snow

4) Snow accumulation must be more.

"The correct term for the process described is feedback inhibition.

Feedback inhibition is a regulatory mechanism where the final product of a metabolic pathway acts as an inhibitor to the enzyme that catalyzes the first committed step of the pathway. This is a form of negative feedback that helps to maintain homeostasis by preventing the overproduction of the end product when it is no longer needed.

To clarify the other terms mentioned:

- Positive feedback occurs when the product of a reaction stimulates the reaction's rate, leading to an amplified response.

- Concerted activation refers to a model of allosteric regulation where the binding of a ligand to one site on an enzyme affects the binding affinity at other sites, usually leading to activation.

- Feedback activation is not a commonly used term in biochemistry. Instead, feedback inhibition is the correct term for the process described.

- Competitive inhibition is a type of enzyme inhibition where the inhibitor molecule binds to the enzyme's active site, competing with the substrate for the active site.

Therefore, the term that correctly describes the process where the end product inhibits the enzyme catalyzing the commitment step in a metabolic pathway is feedback inhibition."

Human blood, which has a pH of approximately 7.4, is a slightly alkaline substance. The correct option is B.

The pH 7 is regarded as neutral on the pH scale, which runs from 0 to 14. A substance's pH scale ranges from 0 to 14, with 0 being acidic and 14 being alkaline.

A pH of 7.4 indicates that human blood is somewhat alkaline in nature and is just barely over the neutral range.

In order to maintain its regular function, the body carefully controls the pH of the blood. The body's acid-base balance and other biological activities require a pH that is somewhat alkaline. For general health and the efficient operation of the body's systems, the body's capacity to maintain the right pH of blood is essential.

Thus, the correct option is B.

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Answer:

The correct answer will be- hypothesis.

Explanation:

The scientific method is used to understand and explain the natural events of nature. The scientist performs the sequential steps to reach the conclusion which includes experimentation.

The experiments are performed to test the proposed predictions called "hypothesis" of the scientific question which explains the question to a limit. The hypothesis is based on the earlier research done on the question so is considered a well-educated guess.

Thus, the key component of being tested via experiments is the "hypothesis".

Answer: Recliners; Decline

Explanation:

If a person spends most of time leaning back on the recliners then the physical fitness of the person will decline.

Leaning back for a longer duration of time decreases the health of spines, as it may lead to pain in back.

Physical fitness needs to be maintained by proper workout and exercise, taking breaks in between if maintaining a constant postures for longer duration of time.

Scientists describe the Alaskan King crab if a fishery is currently removing crabs from the ocean faster than they can reproduce as potentially renewable. Therefore, the correct statement is option B.

Renewable resources are resources which can be replenished naturally over time, such as solar or wind energy, while nonrenewable resources are those that cannot be replaced once they are used up, such as oil or coal.

If a fishery is removing Alaskan King crabs from the ocean at a rate faster than they can reproduce, there are high chances that the population can be depleted faster and cannot be naturally replenish itself. The population of Alaskan King crabs will not be able to recover if this situation continues and will be considered nonrenewable after a certain point.

However, certain measures should be taken for regulating the fishing industry. This will be the only way to ensure that the population has time to recover, and the Alaskan King crab population can potentially renewable itself to support sustainable harvesting practices.

Alaskan King crab can be described as potentially renewable, if measures are taken to regulate the fishing industry and management practices are implemented to ensure sustainable harvesting as the crab population has the potential to recover itself.  

Therefore, if a fishery is currently removing crabs from the ocean faster than the Alaskan King crab can reproduce, the population will be considered as potentially renewable.

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Answer:

The next step in the process is the formation of a prestar core.

Explanation:

After the interstellar dust and gases concentrate in a determined zone gravity starts to unite them and they gather forming a core that is united by gravity. The surroundings start to disperse and the remaining dust starts to expand in the neighboring regions forming different levels of density in dust and gravity force. Which lately will form the satellites, planets or spacial objects that will be bound to the future sun. It is only the second step in the formation of the new star.

The correct answer is A.

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Answer:

The correct answer is D. Both replicate genetic material

Explanation:

Mitosis is the process when an animal cell, plant cell, et cetera divides into two (or replicates itself).

Binary fission is the process when a bacteria splits off into two, which is a simple process since bacteria don't have a nucleus.

They both replicate genetic material when dividing or splitting into two,

so the correct answer is D. Both replicate genetic material.

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The end products of a single episode of meiosis are four haploid cells called gametes.

In a single episode of meiosis, the end products are four haploid cells, known as gametes. These gametes are genetically unique due to the random assortment of chromosomes and crossing over during meiosis. Each gamete contains only one set of chromosomes, which is half the number found in the original cell.

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A buffer zone around large commercial farms is intended to protect surface waters from the harmful effects of fertilizer runoff by intercepting pollutants before they reach water bodies and contribute to eutrophication and 'dead zones'.

Jon is campaigning for the introduction of buffer zones around the large commercial farms in his community to manage the effects of chemical fertilizers. A buffer zone will most effectively protect surface waters from fertilizer runoff. Buffer zones are areas of land maintained in permanent vegetation located between cultivated fields and water bodies, designed to intercept pollutants, soil, and agricultural runoff, containing nitrogen and phosphorus, before they enter water systems. Without such zones, excessive nutrient loads from fertilizer runoff can lead to the eutrophication of water bodies, resulting in an overgrowth of algae that can create 'dead zones' by depleting dissolved oxygen and harming aquatic life. The correct answer to the question is (d) protect surface waters from fertilizer runoff.

A buffer zone around large commercial farms can help manage the effects of chemical fertilizers by d) protecting surface waters from fertilizer runoff. When fertilizer is applied to farmland, it can be carried away by rainwater or irrigation and enter nearby bodies of water, causing eutrophication and dead zones. A buffer zone acts as a barrier, absorbing and filtering nutrients from the runoff before they reach surface waters.

The correct statement is A.) As the human population grows, and fishing technology increases, fish population stocks decline, due to unsustainable fishing practices and overharvesting.

The relationship between the human population, technology, and fish population stocks is one where increased human population and advancements in fishing technology have led to a decline in fish populations. As the demand for fish has grown with the human population, fishing methods have become more efficient with the advent of diesel technology and mathematical ecology. Unfortunately, these advancements have not always been used sustainably, leading to overharvesting and subsequent declines in fish populations. Sustainability in this context means fishing at rates that do not exceed the population's ability to reproduce and maintain healthy population sizes.

Historically, during the age of sailing, fishing efforts had low impact on the environment, allowing fisheries to operate within their carrying capacities. Transitioning to modern times with diesel-powered vessels and advanced fishing techniques, the human capacity to fish has greatly increased. Despite these technological advances, the pressure on fish populations has continued to grow, leading to overfishing and a decline in marine biodiversity, as fish populations are unable to rebound quickly enough to meet intense fishing pressures.

To summarize, the correct statement that describes the relationship between human population growth, technological advancements, and fish stock populations is: A.) As the human population grows, and fishing technology increases, fish population stocks decline. This is due to overharvesting, habitat destruction, and unsustainable fishing practices that have grown alongside human population and technological capabilities.

5 CENTIMETERS is too big foe an ant. It would be A. Lizard

The respiratory measurement that is useful in identifying the difference of obstructive and restrictive pulmonary dysfunction is that a person with restrictive lung disease is indicative of having to have trouble of expanding the lungs while the obstructive lung disease has trouble of having to exhale air from the lungs.

EcoRI and HindIII recognize different sequences of DNI and cut the molecule in different points. For this reason, when digesting the molecule with HindIII, the exposed pattern of minisatellites would have looked different than when using EcoRI.

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A restriction enzyme is a degradative polymer that recognizes and cuts up specific nucleotide sequences in DNI. Restriction enzymes can produce cohesive cuts or blunt (abrupt) cuts, depending on the recognition sites. The frequency in which the restriction enzyme will produce the cuts depends on the recognition sequences and the number of bases that compose them.

So restriction enzymes cut DNI molecules into different short sequences of varying lengths. These pieces are called minisatellites and exhibit the existing variation from one person to the next. These short sequences can be separated by using gel electrophoresis and will express a pattern of differentiation. These are the restriction fragment length polymorphisms pattern, RFLP. Each individual has a unique pattern of minisatellites, which makes this person different than the rest.

The method used to identify an individual based on the minisatellites patterns in their DNI is known as DNA fingerprinting. Although the difference in base sequences between two individuals is very small, fragments produced by restriction endonucleases are of different sizes.

Because EcoRI and Hind III recognize different sequences and cut sites, they will cut the same molecule in different pieces, resulting in a different pattern.  

So, when digesting DNI of person 1 and person 2 with

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