Which of the following is an example of a lipid?
phospholipid.
triglyceride
fats and oils.
all of these

Answer:

Explanation:  

In rest, the tropomyosin inhibits the attraction strengths between myosin and actin filaments. Contraction initiates when an action potential depolarizes the inner portion of the muscle fiber. Calcium channels activate in the T tubules membrane, releasing calcium into the sarcolemma. At this point, tropomyosin is obstructing binding sites for myosin on the thin filament. When calcium binds to troponin C, troponin T alters the tropomyosin position by moving it and unblocking the binding sites. Myosin heads join to the uncovered actin-binding points forming cross-bridges, and while doing so, ATP turns into ADP and inorganic phosphate, which is released. Myofilaments slide impulsed by chemical energy collected in myosin heads, producing a power stroke. The power stroke initiates when the myosin cross-bridge binds to actin. As they slide, ADP molecules are released. A new ATP links to myosin heads and breaks the bindings to the actin filament.  Then ATP splits into ADP and phosphate, and the energy produced is accumulated in the myosin heads, which starts a new binding cycle to actin. Finally, Z-bands are pulled toward each other, shortening the sarcomere and the I-band, producing muscle fiber contraction.

Answer:

The answer is "To store food".

Explanation:

Answer:

C. to store food

Explanation:

Answer:

Divergent boundary is commonly associated with mid-ocean ridges.

Transformational boundary is commonly associated with frequent earthquakes.

Convergent boundary is commonly associated with deep-sea trenches.

Farming is a highly efficient process of crop and animal production over an area of land than hunting and gathering which results in wastage of resources.

Farming is the process of rearing animals or cultivation of crops in an area of land by a farmer.

On the other hand, hunting and gathering refers to the primitive method of hunting of animals and gathering of foods and fruits found in area of land.

There are many advantages of farming an area over hunting and gathering that same area of land. They include:

In conclusion, the process of farming is a careful systematic process while hunting and gathering is left to chance.

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1.Ice melting is a physical change

2.Eggs cooking is a chemical change

3.Salt dissolving is a physical change

4.Wood burning is a chemical change

5. Fireworks exploding is a chemical change

A substance can change physically even when no new substance is created as a result of the change. It simply modifies the substance's outward attributes, such as its shape, size, texture, or phase (such as solid, liquid, or gas).

When a compound undergoes a chemical change, a new substance or substances with new chemical properties are created. Chemical bonds are broken and formed as a result of this process, which transforms one or more chemicals into one or more new substances. Chemical changes can release or absorb energy (heat, light, or sound), and they are frequently irreversible.

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The movement of these tectonic plates is most likely caused by convection currents in the molten rock beneath the crust of the Earth. The immediate consequences of this tectonic shift are earthquakes and volcanic eruptions.

Mountains will grow where plates converge or push together, and continents will split and oceans will form when plates pull apart or diverge. The Earth's geography has changed significantly over the span of millions of years as a result of the continents passively drifting with the plates.

The plates fit tightly against one another and lie on the heated, molten rock of the Earth's mantle like fragments of a split shell.

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Eight of the sixteen children would be expected to have pale cheeks if the parent with rosy cheeks is a heterozygote.

Mendel's law of segregation states that when two parents with different traits mate, the traits of their offspring are determined by what genes they receive from each parent. In this scenario, the parent with rosy cheeks is a heterozygote, meaning that they possess two different alleles for the gene that codes for the complexion of cheek color.

This means that they have both the rosy (k) and pale (r) alleles. According to Mendel's law, each of their offspring has a 50% chance of receiving either the rosy (k) allele or the pale (r) allele from the parent with rosy cheeks. Therefore, if we assume that Mendel's percentages hold true, 8 of the 16 children would be expected to have pale cheeks, with the other 8 children having rosy cheeks.

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Answer:

The reaction that causes a firework to explode requires less energy to start, and occurs more rapidly than the reaction that causes a candle to burn.

Explanation:

The speed of a chemical reaction and the amount of energy required for this reaction is directly linked to the concentration of reagents present in the system. With that, we can say that the higher the concentration of reagents, the faster the chemical reaction will be due to the greater probability of collision between its molecules.

Although the reaction that causes a candle to burn has more reactants than the reaction that causes the fireworks to explode, the latter requires less energy to start. This makes the molecules of the reagents stir faster and collide more efficiently, making the reaction happen much faster.

In summary, the reaction that causes a firework to explode requires less energy to start and occurs more quickly than the reaction that causes a candle to burn.

The reaction that causes a firework to explode requires more energy to start, and occurs more rapidly than the reaction that causes a candle to burn.

The rate of reaction refers to the ease with which reactants are converted to products. The higher the rate of reaction, the faster reactants are converted into products.

The activation energy is the energy required for reactants to be converted into products. It is an energy barrier that separates reactants and products.

From the description of the graphs, we are told that the reaction that causes the explosion of firework starts at high concentration, initially increases slightly then decreases rapidly. The fact that it initially increased slightly before decreasing rapidly implies that the high energy required for the reaction to start is high.

On the other hand, the reaction for the candle to burn starts at high concentration, increases more than the firework, and then decreases rapidly because the reaction requires a lesser energy to commence than the reaction for the burning of candle.

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The correct answer is B. Denitrifying bacteria. This bacteria convert nitrous compounds to molecular nitrogen, which is not usable for animals, it is only usable for certain type of bacteria.

There would be very little or no DNA produced  if in a pcr reaction you used a dna polymerase isolated not from thermus aquaticus, but from an organism that grows at lower temperature .

What is the purpose of PCR?

To amplify (copy) a gene so it can be detected.

How do the strands separate during PCR?

What is a PCR test ?

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Answer:

b

Explanation:

magnet pull toward each other they can't go far.

Answer:

women cannot produce eggs

Explanation:

they produce baby

Ribosomes move along the mRNA strand and connect amino acids according to the sequence of the mRNA. The correct option is A.

Thus, in order to create proteins, ribosomes move along the mRNA strand and join amino acids in the proper order. The mRNA molecule joins to a ribosome during translation, and the ribosome reads the nucleotide sequence on the mRNA one codon at a time.

A molecule known as transfer RNA (tRNA) transports each codon's designated amino acid to the ribosome. The ribosome then joins the amino acids in the polypeptide chain according to the mRNA sequence, which will eventually fold into a protein. The newly created protein is then released after the ribosome reaches a stop codon, which happens to be the end of this process.

Thus, the ideal selection is option A.

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Answer:

A. emigration or increase in death rate

Explanation:

i just took the test and got it rigt lol

The two possible reasons for the change within frog population is emigration or increase in the death rate. Thus, the correct option is A.

The major factors which affect the population of a species are birth rate, death rate, and migration of the species.

Birth rate is the number of individuals born in a population in a particular time period. Birth rate adds more individuals to a population.

Death rate is the number of individuals die in a population in a particular time period. Death rate decreases the population number.

Immigration is the number of individuals which enter a population.

Emigration is the number of individuals which migrate out of a population.

Therefore, the correct option is A.

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Answer:

Skeleton and the skeletal system

Explanation:

Answer:

The most likely correct statement about the two populations that have been geographically isolated from each other for many generations is "Their gene pools are highly dissimilar."

When populations are geographically isolated from each other, they are unable to interbreed, therefore, they evolve independently from each other. Over time, different selection pressures and mutations cause genetic differences to accumulate between the two populations. These genetic differences will become evident when the two populations are brought back together. If the genetic differences are large enough, the two populations may no longer be able to interbreed and produce viable offspring.

The following will decrease the rate of this reaction option B. Reducing the amount of catechol.

In the enzyme reaction you described, reducing the amount of catechol will decrease the rate of the reaction. As catechol is the substrate, it binds to the active site of catechol oxidase, the enzyme, to facilitate the reaction. A lower concentration of catechol would result in fewer substrate molecules available to interact with the enzyme, leading to a slower reaction rate.

Reducing the amount of water (option A) is not likely to affect the reaction rate significantly, as water is a by-product and does not play a direct role in the reaction mechanism. Increasing the amount of catechol oxidase (option C) would typically increase the reaction rate, as there would be more enzyme molecules available to bind with catechol, speeding up the process.

Finally, increasing the amount of benzoquinone (option D) might have minimal effect on the reaction rate, as it is a product, and any potential impact through product inhibition would depend on specific reaction dynamics.

In summary, reducing the amount of catechol, the substrate is the most likely option to decrease the rate of the enzyme reaction involving catechol oxidase. Therefore, the correct option is B.

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Answer:

2.5 x 10¹⁰ ppt

5.0 x 10¹⁰ ppt

1.0 x 10¹¹ ppt

Explanation:

The notation ppt refers to parts per trillion units, that is, how many parts of enzyme are there in 1 trillion parts. Percentage refers to the number of parts per 100 units. Converting the given values from percentage to ppt:

\(\frac{2.5}{100}=\frac{a}{1,000,000,000,000}\\a=2.5 *10^{10}\ ppt\\\\\frac{5.0}{100}=\frac{b}{1,000,000,000,000}\\b=5.0 *10^{10}\ ppt\\\\\frac{10}{100}=\frac{c}{1,000,000,000,000}\\c=1*10^{11}\ ppt\)

The concentration in ppt are:

2.5 x 10¹⁰ ppt

5.0 x 10¹⁰ ppt

1.0 x 10¹¹ ppt

1 Percent [%] = 10 000 000 000 Parts per trillion [ppt]

1%  = 10 000 000 000 ppt

2.5% = ?

Cross multiply

2.5% x 10 000 000 000 ppt / 1 %

= 25, 000 000 000 ppt

1%  = 10 000 000 000 ppt

5% = ?

Cross multiply

5% x 10 000 000 000 ppt / 1 %

= 50, 000 000 000 ppt

1%  = 10 000 000 000 ppt

10% = ?

Cross multiply

10% x 10 000 000 000 ppt / 1 %

= 100, 000 000 000 ppt

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Answer:

ttyyyfuydyrueueyyeyryrrr

The complementary mRNA sequence that is made during transcription from the given DNA sequence TACGGACCAG will be:

AUGCCUGGUCC

What is transcription ?

During transcription, the DNA sequence is used as a template to synthesize an mRNA molecule, where each nucleotide in the DNA sequence is complementary to a nucleotide in the mRNA sequence. In RNA, the nucleotide uracil (U) replaces thymine (T) found in DNA. So, the complementary RNA sequence to the given DNA sequence will have uracil in place of thymine. Thus, the mRNA sequence will have the complementary sequence to the DNA sequence as shown above.

What is DNA?

DNA stands for deoxyribonucleic acid. It is a long molecule made up of repeating units called nucleotides. Each nucleotide consists of a sugar molecule called deoxyribose, a phosphate group, and one of four nitrogenous bases: adenine (A), cytosine (C), guanine (G), or thymine (T).

The order of the nucleotides in the DNA sequence determines the genetic information of an organism. DNA is the genetic material that is passed down from parents to offspring and contains the instructions for the development, function, and reproduction of all living organisms.

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Answer:

Option A: Solids

Explanation:

Due to the fact that heat is transported from a hotter body to a cooler body when two objects are kept in thermal contact, conduction only occurs in solids and not in liquids or gases. Conduction is the term for this mechanism, which uses the same body temperature. When two bodies remain together during conduction to transfer heat In order to transmit heat energy quickly and more efficiently, the molecules of both entities vibrate and collide with one another. Since solids have compactly packed molecules, this allows the molecules to vibrate more and transfer heat more effectively than liquids and gases. When molecules in close proximity to one another clash, energy is transferred. Due to the molecules' near closeness and, in the case of crystals, their clearly defined structure, this occurs very readily in a solid. A few things alter when heat transport in liquids and gases is taken into account. The molecules are not as close together, and gravity has a particular, confusing influence. Heat is transferred through collisions of nearby particles in a process known as convection. The metal surface particles are transmitting heat to the liquid through conduction at the metal-water interface if convection is occurring between a solid that is hotter than the liquid adjacent to it, such as a pan on the stove. But when that occurs, the water's density begins to alter. The water molecules at the surface move faster, contain more energy, and occupy more space per mass (they are less dense). Because water molecules may pass one another and gravity makes this easier, the less dense water near the metal surface is replaced by the more dense water above it. Natural convection is the mechanism through which a liquid or gas moves in this manner as a result of variations in density. Conduction is no longer possible unless you can prevent the effect of fluid density on the flow of gases or liquids. Fundamentally, in both liquids and gases as well as solids, molecules continue to exchange energy through collisions. Conduction, however, performs this considerably more effectively in liquids at the metal-liquid contact and less so as you travel away from the interface and upward through the liquid. Convection is the movement of particles to transfer heat.

Bottom Line: Conduction may occur in gases and liquids, but you must be able to reduce the impact of gravity. These are known as "stagnant fluids." Convection is the term used to describe fluid movement caused by density variations when they are not prevented.

The events described involve both mechanical and chemical weathering processes, highlighting the complex nature of how weathering affects geological structures.

The events can be identified as the result of mechanical weathering or chemical weathering as follows:

The minerals in a marble statue react with water to form acids and pores in the structure - This is an example of chemical weathering. The water reacts chemically with the minerals in the marble, causing them to dissolve and form acids. These acids further react with the marble, leading to the formation of pores and overall degradation of the statue's structure.

A piece of rock crumbles after being constantly thrashed by strong waves - This is an example of mechanical weathering. The constant thrashing of strong waves exerts physical force on the rock, causing it to break apart or crumble. This type of weathering occurs due to mechanical forces like abrasion, pressure, or impact that physically break down the rock into smaller pieces.

Industrial runoff forms cracks in a rocky structure in its path - This is a combination of chemical and mechanical weathering. The industrial runoff may contain acidic or corrosive substances that chemically react with the minerals in the rock, leading to their dissolution or weakening. The cracks in the rocky structure may also be a result of the mechanical force exerted by the flowing runoff, causing physical fractures in the rock.

The rocks in a region are streaked orange after being exposed to repeated rains - This is an example of chemical weathering. The repeated rains introduce water into the rocks, which may contain dissolved iron compounds. Over time, these iron compounds oxidize in the presence of water and oxygen, leading to the formation of orange-colored iron oxide minerals, such as rust. The streaking of rocks with orange indicates the chemical transformation of the minerals due to the weathering process.

In summary, the events described involve both mechanical and chemical weathering processes, highlighting the complex nature of how weathering affects geological structures. Mechanical weathering involves physical forces breaking down rocks, while chemical weathering involves chemical reactions leading to the alteration or dissolution of minerals.

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'Animal hormones are produced in the endocrine glands and travel through the blood'.

What are hormones?

Hormones are organic chemical compounds produced by the endocrine glands that are released into the bloodstream and act as messengers, traveling to different parts of the body to regulate various bodily functions. Hormones are involved in processes such as metabolism, growth and development, tissue function, sexual function and mood.

They travel through the blood because it is the most efficient way to reach the target cells in the body. The hormones have to interact with the target cells in order to have an effect, so they need to be able to reach the target cells in the quickest and most effective way possible.

Hence, Option A is correct.

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Answer:

A is false

Explanation:

Answer: it would be C e is correct however but that’s already happened. So that wouldn’t be much of a prediction. Hope this helped :)

Explanation:

Thermal expansion of oceanic water leads to a main global sea level rise. So the correct option is D.

Because it absorbs heat in the form of infrared light from the Sun, a greenhouse gas circulates that heat throughout the atmosphere before losing it to space. Although it has a considerably smaller impact on global temperatures, greenhouse gases also speed up the pace at which the environment can collect short-wave radiation emitted by the Sun.

More heat from the Sun is being trapped in our atmosphere thanks to the accumulation of CO2 that is emitted after the combustion of fossil fuels. Human-made acts are referred to as anthropogenic actions, and the emission of CO2 is one such anthropogenic activity that adds to the current heightened greenhouse effect.

A greenhouse gas's contribution to the greenhouse effect is determined by how much energy it absorbs, how much it reflects back, and how much of it is present in the atmosphere.

Therefore the correct option is D.

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Answer: True

Explanation: Cells are the smallest common denominator of life. Some cells are living organisms on their own and are referred to as single-celled organisms.

Answer:

the answer is C

Explanation:

The true statement about panic attacks is: d. They can lead to social isolation.

Panic attacks are intense and sudden episodes of overwhelming fear or distress that can be debilitating for individuals who experience them. They are characterized by a rapid onset of intense physical and psychological symptoms, often reaching peak intensity within minutes. While panic attacks can vary in duration and individual experiences, option c, which states that they typically last for 5 to 10 minutes, is not universally true. Panic attacks can range from a few minutes to longer durations, and the length can vary between individuals.

Option a, stating that panic attacks are not linked to heredity, is incorrect. There is evidence to suggest that there may be a genetic component to panic attacks and panic disorder, with a higher risk observed among individuals with a family history of panic disorder.

Option b, suggesting that symptoms can include decreased respiration, is possible but not a defining characteristic of panic attacks. While some individuals may experience changes in their breathing patterns during a panic attack, such as hyperventilation or shortness of breath, it is not a universal symptom and can vary between individuals.

Option d, stating that panic attacks can lead to social isolation, is true. Panic attacks can have a significant impact on an individual's daily life and functioning. The fear of experiencing another panic attack or the embarrassment associated with the symptoms can lead individuals to avoid certain situations or places, which can eventually result in social isolation. The fear of having a panic attack in public or being judged by others can lead to the withdrawal from social activities and interactions. Therefore, the correct answer is d. They can lead to social isolation.

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