The ________ and __________ are the vessels in the fetal pig heart that is absent in adults.

Answer:

the drug was pulled from the market because of the evidence that it was a(n) teratogen

Explanation:

Teratogens are drug or other agents that cause physical or functional bnormalities in fetuses that are exposed to such agents. A typical example is alcohol. The degree of the abnormality on the fetus depends on a number of factors which are:

Answer:

It's about 650 nm

Explanation:

Look at the graph, the orange line correspond to 4500K and the most power is where the highest point of the line

Answer:

It's about 650 nm

Explanation:

Word describes a trait that helps an organism survive in its environment is D. Adaptation.

In general , Adaptations of certain characteristics and traits help an organism to survive and reproduce in its environment. Adaptations can in various forms it may be behavioral, physiological, or structural.

They get originated from the process of natural selection, that is mechanism that help organisms to better adapted in their environment and survive, reproduce easily  than those who are less adapted. On the other hand mutation is a genetic change . Camouflage is known as the behavioral adaptation .

Hence, D is the correct option

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A species with a low basicity and/or high steric hindrance is more likely to act as a base rather than a nucleophile. Examples of such species include tertiary amines, bulky alcohols, and alkoxides.

In general, a base is defined as a substance that accepts a proton, while a nucleophile is defined as a substance that donates a pair of electrons to form a chemical bond. Based on these definitions, the following factors contribute to a species being more likely to act as a base rather than a nucleophile:
1. Basicity: A species with a higher basicity will be more likely to act as a base than a nucleophile. This is because a more basic species has a greater affinity for accepting a proton than for donating electrons.
2. Steric effects: A species with a bulkier or more hindered structure will be more likely to act as a base than a nucleophile. This is because a bulky or hindered species has a more difficult time approaching a molecule to donate electrons.
3. Electronegativity: A species with a higher electronegativity will be more likely to act as a nucleophile than a base. This is because a more electronegative species has a greater attraction for positive charge, making it more likely to donate electrons.
Therefore, a species with a low basicity and/or high steric hindrance is more likely to act as a base rather than a nucleophile. Examples of such species include tertiary amines, bulky alcohols, and alkoxides.

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Alpha helix of protein secondary structure is highlighted.

A is the correct answer.

In a polypeptide chain, the adjacent amino acid residues are arranged in a secondary structure that is predictable and repeated. Between the amide hydrogens and the carbonyl oxygens of the peptide backbone, hydrogen bonds are formed to keep it in place. In terms of secondary structures, -helices and -structures are the most prevalent.

The secondary protein structure known as alpha helix is created by twisting polypeptide chains into a configuration resembling a right-handed screw. The stability of the helix structure is due to hydrogen bonds that are established between the -NH- group of amino acids in one turn and the >C=O. group of amino acids that belong to the adjacent turn.

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Answer:

A. Air

Explanation:

Abiotic factors are things that are not living.

Air can be found in a rain forest ecosystem, as it can be found in all ecosystems, but it is not living.

On the other hand, algae, flowers, and animals are biotic instead of abiotic because they are living things.

So, A is the correct answer.

The correct option is (B), i.e., responsible for targeting specific protein substrates. The 26S proteasome degrades folded and unshaped polyubiquitylated proteins by a process requiring ATP hydrolysis.

It couples mechanisms needed for declination, including substrate unfolding( when demanded), deubiquitylation, translocation, and declination.   The proteasome is a multisubunit enzyme complex that plays a central part in regulating specific protein substrates that control cell-cycle progression and apoptosis and has thus become an important target for anticancer remedies.

ATP is needed for the covalent conjugation of ubiquitin to protein substrates. This revision markedly enhances the declination rates of some, but not all, proteins. Second, ATP appears to stimulate the exertion of a protease that can demean both ubiquitinated and-ubiquitinated proteins.

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The four histones that make up the nucleosome core are:

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Answer:

the light provides hydrogen ions in the formation

Explanation:

the light provides energy to split water molecules. This provides electrons and ions alike in the process.

Answer: A

Explanation:

Took the test

(a) The probability of a randomly chosen person having hemophilia is 0.000105.

(b) The probability that a given person with hemophilia is male is approximately 1.9.

(a) Probability that a randomly chosen person has hemophilia:

Haemophilia can affect both males and females, but we need to find the probability for both. Hence,

the probability of having hemophilia = probability that a randomly chosen person is male × probability that a male has hemophilia + probability that a randomly chosen person is female × probability that a female has hemophilia

Probability of having hemophilia in males = 2/10,000 = 0.0002

Probability of having hemophilia in females = 1/100,000 = 0.00001

Probability of a randomly chosen person is male = 0.5

Probability of a randomly chosen person is female = 0.5

Probability of having hemophilia = 0.5 × 0.0002 + 0.5 × 0.00001 = 0.000105

(b) Probability that a given person with haemophilia is a man:

From (a), we know that the probability of having hemophilia is 0.000105. Therefore, the probability that a given person with hemophilia is male is:

probability that a given person with haemophilia is a man = probability that a male has hemophilia/ probability of having hemophilia = 0.0002/0.000105 = 1.9048≈1.9 (approximately).

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Answer:

The heat from radioactive processes within the planet's interior causes the plates to move, sometimes toward and sometimes away from each other. This movement is called plate motion, or tectonic shift.

Explanation:

The theory of plate tectonics revolutionized the earth sciences by explaining how the movement of geologic plates causes mountain building, volcanoes, and earthquakes.

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Answer:

Ionic compounds are ion compounds. These ions are atoms that gain or lose electrons, resulting in a net positive or negative charge. Metals tend to lose electrons, so they have a net positive charge and become cations. Non-metals tend to gain electrons, creating a net negative charge of anions.

Explanation:

Answer:

condensation

Explanation:

Answer:

A. condensation

Explanation:

Evaporation is the process of liquid turning into gas, the opposite would be condensation which is the process of water vapor turning back  into a liquid.

Answer:

Phơi nắng vào buổi sáng.

Answer:

chúng ta phải bổ sung thêm vitamin D qua các sản phẩm như lòng đỏ trứng, cá, sữa.

Explanation:

Answer: What type of microscope would be best for studying the structures found inside of cells? transmission electron microscope

What are the three basic parts of the cell theory?

1. All living things are composed of cells.

2.Cells are the basic units of structure and function for living things.

3. All cells come from pre-existing cells.

What is a tissue? a group of cells that have similar structure and that function together as a unit

Explanation:

Chemical signals are translated into cellular responses through a process known as signal transduction.

When a chemical signal, such as a hormone or neurotransmitter, binds to its specific receptor on the cell surface, it initiates a cascade of events known as signal transduction. This process allows the cell to convert the extracellular chemical signal into an intracellular response.

Signal transduction involves a series of molecular interactions and signaling pathways. Once the chemical signal binds to its receptor, it can activate various intracellular signaling molecules, such as G proteins or protein kinases. These signaling molecules relay the message to other components within the cell, such as second messengers or transcription factors.

Second messengers, such as cyclic AMP (cAMP) or calcium ions, amplify and transmit the signal within the cell, leading to the activation of specific enzymes or gene expression. Transcription factors can enter the nucleus and regulate the expression of specific genes, resulting in the synthesis of new proteins or changes in cellular processes.

Ultimately, the translation of chemical signals into cellular responses involves a complex network of molecular interactions, signaling pathways, and gene regulation, allowing cells to respond appropriately to their environment and maintain homeostasis.

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If you are performing a gram stain on gram-negative bacteria and stop after the decolorizer step, the appearance of the bacteria at this point is colorless.

Gram stain is a laboratory method that is used to differentiate bacterial species into two groups; gram-positive and gram-negative bacteria. The gram-positive bacteria retain the crystal violet dye and stain purple, whereas the gram-negative bacteria lose the crystal violet dye and stain red with the counterstain.

In gram-negative bacteria, the outer membrane contains a lipopolysaccharide layer that assists in repelling crystal violet, leading to the washing of the dye from the cells. After decolorizing with alcohol, the crystal violet washes away, leaving behind a colorless bacteria cell. As a result, the gram-negative bacteria stain red when the counterstain safranin is applied.

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Answer: Placenta

Explanation:

Placenta is the outer protective envelope around the developing embryo. It is attached with the lining of the uterus. It has a permeable membrane which allows the entry of oxygen and nutrients to be supplied to the embryo. It helps in getting rid of harmful substances like carbon dioxide and waste from the developing fetus body.

The cell membrane is selectively permeable.

The three processes where water enters the atmosphere are Evaporation, transpiration, and sublimation.

1. Evaporation: This is the process by which water changes from a liquid state to a vapor state. It occurs when water molecules on the surface of bodies of water, such as oceans, lakes, and rivers, gain enough energy to break their hydrogen bonds and escape into the atmosphere as water vapor. Evaporation is driven by solar energy, and the rate at which it occurs depends on factors like temperature, humidity, and wind.

2. Transpiration: This process involves the movement of water through plants and its eventual release into the atmosphere. Plants absorb water from the soil through their roots and transport it to their leaves, where it is used for photosynthesis. Some of this water is lost to the atmosphere in the form of water vapor through small openings called stomata, which are primarily located on the undersides of leaves. Transpiration helps regulate the plant's temperature and maintain its water balance.

3. Sublimation: This is the direct transition of water from a solid state (ice or snow) to a vapor state, without passing through the liquid phase. Sublimation occurs when the temperature and atmospheric pressure conditions allow water molecules in the solid phase to gain enough energy to enter the vapor phase directly. This process contributes to the moisture content in the atmosphere, especially in cold regions where ice and snow are present.

These three processes work together to continuously cycle water between the Earth's surface and the atmosphere, playing a vital role in maintaining Earth's water balance and climate.

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It is an facilitated kind of transportation.

Although many polar molecules, including glucose, can pass through cell membranes, ions and the majority of polar molecules cannot. Certain transmembrane proteins function as transporters to allow these compounds to traverse membranes.

Response and justification A transport protein is a type of membrane protein that is involved in moving ions and polar molecules across the membrane. Protein pumps and channel proteins are two different classes of transport proteins that carry out this function.

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Answer:

Biofilms are slimy, glue-like membranes that are produced by microbes in order to colonize surfaces. They protect microbes from the body's immune system and increase their resistance to antibiotics

Answer:

stereoisomers are isomers that have the same composition (that is, the same parts) but has difference in the orientation of those parts in space. There are two kinds of stereoisomers: enantiomers and diastereomers .

If tallness is dominant, a man who is homozygous for tall would have the genotype TT. In this case, both alleles inherited from his parents would be for tallness. Therefore, all of his gametes would contain a T allele.

The possible gamete combinations for a homozygous dominant individual (like the one described in this scenario) are limited to a single type. In this case, the man's gametes would all contain a T allele, as there are no alternative alleles present to be passed on during gamete formation. So, all of his gametes would be T, and the resulting offspring of his mating would all inherit a T allele from him.

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Answer:

C

Explanation:

C. the planets revolved around the sun

Answer:

A.

Explanation:

Its True because the dog sleep like human