19. how do enzymes speed up chemical reactions? a. i only b. i and ii only c. i and iii only d. ii and iii only e. i, ii and iii

Answer: Angiosperms represent approximately 80 percent of all known living green plants. Examples range from the common dandelion to ancient flowers such as magnolias. Angiosperms also make up the vast majority of all plant foods we eat. (Ex. grains, vegetables, and fruits.) The angiosperms are vascular seed plants in which the ovule (egg) is fertilized and develops into a seed in an enclosed hollow ovary The ovary itself is usually enclosed in a flower, that part of the angiospermous plant that contains the male or female reproductive organs or both. fruits are derived from the maturing floral organs of the angiospermous plant and are therefore characteristic of angiosperms.

Explanation: ^

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Answer:

Explanation:

Given:

  runner is launched at 30° angle to horizontal at 11 m/s

  acceleration due to gravity is g = -9.8 m/s²

Find:

  runner's hang time

  runner's distance to the landing point

  runner's maximum height

Solution:

The (horizontal, vertical) speed components will be ...

  (11 m/s)(cos(30°), sin(30°)) = (5.5√3 m/s, 5.5 m/s)

The time of flight can be found from the height formula:

  h(t) = 1/2gt² +vt . . . . . . where v is the vertical speed at launch

The time we're concerned with is the time when h(t)=0 and t>0.

  0 = -4.9t^2 +5.5√3t = t(-4.9t +5.5√3)

The second factor is zero when ...

  t = (5.5√3)/4.9 ≈ 1.122 . . . seconds hang time

__

The distance to the landing point will be the product of horizontal speed and hang time:

  d = (5.5 m/s)(5.5√3/4.9 s) ≈ 10.693 m . . . . distance to landing

__

The maximum height can be found from the formula (based on conversion of kinetic energy to potential energy) ...

  h = v²/|2g| = (5.5 m/s)²/(2(9.8 m/s²)) ≈ 1.543 m . . . . maximum height

The Galápagos Tortoises demonstrate Darwin's theory of evolution by natural selection.

Darwin's theory of evolution is a scientific explanation of how species of organisms change over time through the process of natural selection. He observed that the tortoises differed in their physical characteristics.Over time, those traits that helped individuals survive and reproduce in their specific environments became more common in the population.

It is believed that a single species of tortoise initially colonized the Galápagos Islands, likely by drifting on ocean currents. Once on the islands, the tortoises likely underwent speciation through natural selection and genetic drift, leading to the evolution of the different subspecies that we see today.

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The production of lactose by the mammary gland does not require the ingestion of milk or milk products.

The woman will be able to breastfeed her baby because she can produce lactose from amino acids and other carbohydrates. She will not have to eat pure galactose or even lactose to do so. Glucose, which can be provided by gluconeogenesis or obtained from the diet can be converted to UDP-galactose.

UDP-galactose reacts with free glucose to form lactose. α-Lactalbumin is a protein that serves as the modifier of galactosyltransferase, which catalyzes this reaction. The amino acids of α lactalbumin can be used to produce glucose, but the immediate products of α-lactalbumin degradation are not lactose. Carbohydrates cannot be synthesized from fats.

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Proteins are macromolecules formed by structural units called amino acids, they are the main source of nitrogen that are required in various synthetic pathways.

Proteins are macromolecules present in cells that coordinate multiple vital functions, they are also known as polypeptides.

They are the nutrients that form tissues, transport vitamins and are essential for growth, thanks to their nitrogen content, which is not present in other molecules such as fats or carbohydrates.

Therefore, we can conclude that proteins are macromolecules (very large molecules) that are the main source of nitrogen atoms for the human body.

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Answer:

I don't know if this will help, sorry if wrong.

Eukaryotic gene expression is more complex than prokaryotic gene expression because the processes of transcription and translation are physically separated.

Given the allele frequency for a gene in population a is 0.3 and the frequency for the same allele in population b is 0.5 and that 25 individuals from a migrate to and mate randomly with the 475 individuals in population b, the new allele frequency (pc) in the conglomerate is 0.47.

To find the new allele frequency (pc) in the conglomerate, given the allele frequency for a gene in population a is 0.3 and the frequency for the same allele in population b is 0.5 and that 25 individuals from a migrate to and mate randomly with the 475 individuals in population b, we will make use of the formula given below. 

The formula to calculate the new allele frequency (pc) in the conglomerate is given below.pc = (pa x Na + pb x Nb) / (Na + Nb)Where,pa = allele frequency in population a (given)pb = allele frequency in population b (given)Na = number of individuals in population a (given)Nb = number of individuals in population b (given)Given,pa = 0.3pb = 0.5Na = 25Nb = 475Now, let's substitute the given values in the formula to get the new allele frequency in the conglomerate.pc = (0.3 x 25 + 0.5 x 475) / (25 + 475) = 0.47The new allele frequency (pc) in the conglomerate is 0.47. Therefore, the correct answer is 0.47.

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Answer:

B

Explanation:

Diatomic molecules are molecules composed of only two atoms, of the same or different chemical elements. The prefix di- is of Greek origin, meaning "two".

The word "di" means two, and "diatomic" means a molecule with two atoms that is present in Option B. Diatomic molecule may consist of similar atoms or may have different atoms, such as nitrogen oxide.

Diatomic molecules are those that have two atoms within the molecule, such as hydrogen (H₂), nitrogen oxide, etc. In a single compound, there are many atoms that are present, and they make different bonds with each other, such as the covalent bond.

Aside from the covalent bond, there are other types of bonds, such as ionic bonds, but not all types of elements that are present in the periodic table can form the diatomic molecule. The homonuclear diatomic molecule is hydrogen, where two hydrogen atoms are present, and an example of the heteronuclear diatomic molecule is nitrogen oxide, where nitrogen and oxygen atoms are present.

Hence, the correct answer is option B, which is a diatomic molecule with two atoms.

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You conduct the tests, compare the findings to what you would have anticipated would occur if each explanation were true, and then rule out any candidates whose predicted outcomes did not emerge from the experiment. The scientific explanation or hypothesis is what is left over after this procedure.

The scientific method is what is known as a methodical and empirical strategy used to research and understand natural phenomena.

The scientific method involves observation, hypothesis formation, prediction, experimentation, and conclusion drawing. The explanation that remains after all other explanations have been eliminated is referred to as the scientific theory.

A theory is a well-thought-out explanation for observations of the natural world that has been established using the scientific method and incorporates a number of facts and hypotheses.

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Evolutionary classification differs from traditional classification in that it groups species into larger categories that reflect hypotheses about lines of descent. The main idea behind evolutionary classification is that all species are related through descent from a common ancestor.

Evolutionary classification differs from traditional classification in that it groups species into larger categories that reflect hypotheses about lines of descent.

Evolutionary classification is a scientific classification system in which species are classified based on their evolutionary relationships with each other. This implies that species that have common evolutionary origins are grouped together while species that do not are grouped separately. In the traditional classification system, organisms are classified based on observable characteristics.

Traditional classification is based on observable characteristics of organisms such as physical and structural similarities. This system of classification is called the morphological classification system. In traditional classification, species are grouped together based on shared physical features, such as their appearance, anatomy, and physiology.

The differences between evolutionary and traditional classifications are: The classification of organisms is based on observable similarities and differences in traditional classification, whereas it is based on evolutionary relationships in evolutionary classification. Evolutionary classification groups species into larger categories that reflect hypotheses about lines of descent, while traditional classification groups species into smaller categories based on their morphological characteristics. Evolutionary classification is limited to explaining how species came into existence and evolved over time, while traditional classification is used to identify and organize organisms based on their observable features.

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Answer:

the job has more and more people have been asked about this problem than they have ever been before I had a

Answer:C The supply of vehicles will increase

Explanation:

Answer:

Your pupils adjust to the amount of light that they are receiving.

When it is dark, then enlarge. When it is light, they shrink.

Explanation:

If SHH is to be accumulated and then released into cellular space at a specific time, it would be necessary to establish storage mechanisms and release mechanisms.

To store the produced SHH would require specialized cellular compartments.

To release all of the stored SHH, a signal or stimulus would need to trigger the release of SHH from storage into the extracellular space.

SHH is a protein that is stored within the cell and is released into the extracellular space in times of need. These processes need to work in a very regulated way in order to achieve their objectives. For this reason, well-regulated and optimized storage and release mechanisms are needed.

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Answer: cells are incredibly accurate when they are copying DNA, but there are going to be some errors.

Most of these errors can often times break the organism in some way or might not at all.

But every now and then, some of these errors either as an individual base pair or maybe cumulatively can produce a different phenotype and potentially a phenotype that has an advantage.

This is mutation.

A mutation is a change to an organism's DNA sequence. Errors in DNA replication during cell division, exposure to mutagens, or viral infection can all cause mutations.

There are three types of DNA Mutations:

Base substitutions : Point mutations are single nucleotide substitutions; consider the point mutation Glu ——-> Val is the culprit of sickle cell anaemia.

Deletions : A deletion happens when one or more base pairs are deleted from the DNA, which causes a frameshift.

Insertions: Depending on whether multiples of three base pairs are entered, the addition of additional base pairs may cause frameshifts.

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Answer:

Mountain ecosystem, complex of living organisms in mountainous areas.

Answer:

B

Explanation:

I have never heard of volcanoes on Mercury, and there couldn't be water since it would evaporate immediately. This means it either creates its own heat or it's because it's so close to the sun. Now, if you think about it, we don't create our own heat, we only trap it. So it is safe to assume that it's so hot because it's so close. Hope this helps!

Answer:

The answer is B because it's the closest to the sun

If romaine lettuce and iceberg lettuce are substitutes, a increase in the price of romaine lettuce will increase the demand for iceberg lettuce.

A kind of lettuce known as romaine or cos lettuce (Lactuca sativa L. var. longifolia) develops in a tall head of strong, dark-green leaves with firm ribs along their centres. It tolerates heat better than the majority of lettuces. Romaine is frequently offered for sale in North America as complete heads or as "hearts" that have been stripped of their outer leaves and frequently bundled together. Both U.S. and Canadian health agencies have occasionally issued product warnings for commercially available romaine lettuce, informing consumers that these supplies may occasionally become contaminated with or harbour harmful E. coli bacteria.

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Both phospholipids and proteins are components of the plasma membrane of prokaryotes.

The plasma membrane, also known as the cytoplasmic membrane, is a thin and flexible barrier that surrounds the cytoplasm of prokaryotic cells. It is composed of a lipid bilayer, made up of phospholipids, which acts as a barrier to the free movement of molecules in and out of the cell. Proteins are also found in the plasma membrane and play important roles in maintaining the structure and function of the membrane, including transport of molecules across the membrane, communication with other cells, and recognition by the immune system. Both phospholipids and proteins are essential components of the plasma membrane and play crucial roles in maintaining the integrity and function of prokaryotic cells.

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In epithelial tissue, the lamina propria contains blood vessels and lymphatic vessels receiving what we need for living.

In epithelial tissue, the lamina propria has blood vessels and lymphatic vessels that aid in the transport of oxygen, nutrients, and other essential molecules to the tissues. The lamina propria also contains a network of nerves that help to regulate the function of the epithelial cells and coordinate their response to changes in the environment. Additionally, the lamina propria is rich in immune cells that help to protect the tissue from infection and inflammation.

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The karyotype of an individual with trisomy 18 is represented as Edward's syndrome. It occurs due to failure of the sister chromatids to separate in mitosis.

The karyotype with trisomy 18 is a genetic disorder. It is also known as Edward's syndrome. In this disorder, a person has a third copy of the material from chromosome 18, instead of the usual 2 copies. Rarely, the extra chromosomal material may be attached to another chromosome i.e., translocation. In most cases, this chromosome is not passed down through the families.

During cell division, chromosomes do not always separate equally into daughter cells which results into one daughter cell with extra chromosome and one daughter cell with no or small stretch of chromosome. This sometimes happens in mitotic division, when the sister chromatids fail to separate out during anaphase. One daughter cell thus ends up with more chromosomes in its nucleus than the other cell.

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Answer:

True.

Explanation:

Autoclaving is the most effective among all moist heat-related antimicrobial methods because this method can kill all the harmful microbes such as bacteria, fungi and viruses. Moist heat causes destruction of microorganisms by denaturation of macromolecules that is present in their body such as proteins. Autoclaving is a very common method for moist sterilization. It is an effective method in killing fungi, bacteria, spores, and viruses but it does not eliminate prions.

Answer:

So, assuming the dice are 'fair' (that each of the six numbers has a probability of 1/6 of showing up on each of the dice), there is a probability of 1/36 that all three dice will show the same number.

Explanation:

Explanation:

Radio Frequency Is one of the electromagnetic frequency waves that lie in the range stretching from below 3 kilohertz to around 300 gigahertz and which includes the frequencies used for communication signals (such as for radio and television broadcasting and cellular telephone and satellite transmissions)

I hope this helps

Answer:

I'm thinking molecular energy.

Explanation:

just because you know, molecules, molecular... that's all I got I'm afraid :(

False. Middle-range factors do not favor disruptive selection.

Disruptive selection occurs when extreme phenotypes are favored over the intermediate phenotype, leading to a bimodal distribution.

This means that individuals with traits on both ends of the spectrum have a selective advantage, while those with intermediate traits are at a disadvantage.

In the case of human birth weights, where the middle range is favored, it would be an example of stabilizing selection.

Stabilizing selection favors the intermediate phenotype and acts to reduce the variability in a population, maintaining the status quo.

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Explanation:

6CO² + 6H2O = C6H12O6 + 6O2

Important note: Do NOT write an equal sign whenever you write it, make sure it's an arrow, otherwise the answer will be wrong. And if you use and equal sign in an exam, then you will get 0 marks. The reason I used an equal sign was because I couldn't find an arrow on my keyboard.