which one of the following is true of trnas? a trnas carry special sequences known as codons. b all of the above. c each trna binds a particular codon. d none of the above. e there are four types of trna. f trnas are double-stranded.

Current models regarding the dispersal of modern humans indicate that the earliest modern humans emerged from Africa and dispersed across the globe, eventually replacing all other hominin populations.

This event, known as the Out of Africa migration, occurred around 60,000 years ago. Modern humans likely first migrated out of Africa into the Middle East, then moved into Asia and Europe, and finally reached Australia and the Americas. This is supported by genetic, archaeological, and fossil evidence.

Additionally, some researchers believe that there were multiple waves of migration out of Africa, with different groups taking different routes and settling in different regions.

This theory challenges the previously accepted belief that modern humans evolved independently in multiple regions of the world. Instead, it suggests that all modern humans share a common African ancestry.

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Answer:

A A U C C

A AAA Lysine AUA ACA Threonine

A AAU Asparagine AUU ACU Threonine

A AAC Asparagine AUC ACC Threonine

The codon UUC encodes for the amino acid phenylalanine, the codon UCU encodes serine, and the codon CUU encodes leucine. So the correct answer is (a).

Organic substances known as amino acids have both amino and carboxylic acid functional groups. Proteins are made up of substances called amino acids. Proteins and amino acids are the components of life.

A collection of instructions called the genetic code governs how DNA is converted into proteins. Codons, which are three-nucleotide sequences, are the building blocks of the code. Codons each represent each individual amino acid.

The codons UUC, UCU, and CUU all code for the amino acid phenylalanine. The third nucleotide in the codon determines the amino acid that is encoded. The codons UUA and UUG has different nucleotide from phenylalanine in the third position and thus code for leucine. The codon UCG encode for Serine.

Therefore, option (a) is right.

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Answer:

A.) White dwarfs are formed from the collapse of low mass stars, less than about 10 time the mass of the Sun. ... On the other hand, neutron stars are formed in the catastrophic collapse of the core of a massive star.

B. According to the HR diagram, a star with the surface temperature of 10,000 Kelvin is a star with a B spectral type. Moreover, if the star were on the main sequence, then it would have a luminosity nearly 100 times more than that of the sun.

C. After leaving the main sequence, Vega will become a class-M red giant and shed much of its mass, finally becoming a white dwarf. At present, Vega has more than twice the mass of the Sun and its bolometric luminosity is about 40 times the Sun's.

Explanation:

Answer:

The lymphatic system consists of all lymphatic vessels and lymphoid organs. For example, the lymph nodes, spleen, thymus as well as the lymphatic tissue found in the small intestine (Peyer’s patches) and throat (adenoid tonsils, palatine and tubal tonsils), to name a few, all represent lymphatic organs.Hence, rather than representing a single organ, the lymphatic system comprises a circulatory network of vessels and lymphoid tissue and cells in every part of the body. It works together closely with the blood-producing (haematopoietic) system in the bone marrow, thereby playing a vital role in immune responses to protect the body from various pathogens. Also, the lymphatic vessel network helps transporting nutrients and waste products in the body.

Answer:

please follow me

Explanation:

yr60zpzyoy9yit*fiif7rrr

Answer:

Krebs cycle involves a series of reactions which oxidize the pyruvic acid molecules formed from glycolysis to produce carbon dioxide, energy(atp) as well as water

Answer:

Immune system

Golgi

pancreas

Explanation:

Answer:

DNA replication occurs during the S phase of interphase. The S phase is the second phase of the interphase, which follows the G 1 phase.

Explanation: Interphase is the portion of the cell cycle that is not accompanied by observable changes under the microscope, and includes the G1, S and G2 phases. During interphase, the cell grows (G1), replicates its DNA (S) and prepares for mitosis (G2). A cell in interphase should not be confused with a cell in quiescent state, which represents most of the cell’s lifetime.

Answer:

Interphase

Explanation:

The condensing of chromatin into chromosomes occurs in the prophase stage of mitosis (option A).

Mitosis is the division of a cell nucleus in which the genome is copied and separated into two identical halves. It is normally followed by cell division.

Mitosis occurs in four stages as follows;

Prophase is the first stage of mitosis, during which chromatin condenses to form the chromosomes.

According to this question, mitosis is the final stage of cellular division where the nucleus divides. Before entering this stage, the DNA exists in strands called chromatin. However, in order to divide, the chromatin must condense down into chromosome in a stage called prophase.

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Answer: competition

Explanation: when its a fight its a competition

Answer:

1.=competition

2.=predation

Explanation:

The emergence of new viruses can occur through a variety of mechanisms. Therefore, the correct answer is (d) all of the above.

Emerging viruses are viruses that have recently appeared or are rapidly increasing in incidence or geographic range. These viruses are often new strains or variants of known viruses that have mutated or evolved to become more virulent, infectious.

Emerging viruses can pose significant public health threats, as they often have no known treatments or vaccines and can rapidly spread from person to person.

Therefore, the correct option is D

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Answer:

C. foreshocks

Explanation:

Hope this helps

Agar plates are the standard solid support material for growing microorganisms.

Agar plates are Petri dishes used to cultivate microorganisms that contain a growth media that has been hardened with agar. Antibiotics are one example of the selective chemicals that are occasionally added to affect growth.

96 pinner for use in spot experiments with yeast, fungal, or bacterial cells

Individual microorganisms placed on the plate will develop into distinct colonies, each of which is a clone genetically identical to the distinct ancestor organism (except for the low, unavoidable rate of mutation). As a result, the plate can be used to estimate the number of organisms in a liquid culture or a suitable dilution of that culture using a colony counter, as well as to create genetically pure cultures from a mixed culture of genetically diverse organisms.

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Answer:

Explanation:

Without additional information about the specific traits and mutations in question, it is not possible to provide a definitive answer. However, in general, mutations can affect the prevalence and distribution of traits over time, as they can introduce new genetic variation into a population that can either increase or decrease the frequency of certain traits.

In evolutionary biology, the concept of natural selection can also play a role in determining which traits are most common over time. Traits that confer a selective advantage, such as increased fitness or survival, may become more prevalent in a population over time, while traits that are disadvantageous may decrease in frequency.

Therefore, to determine whether mutations affected the most common trait at time 3, it would be necessary to know which specific traits and mutations are being considered, as well as any selective pressures or environmental factors that may have influenced their prevalence over time.

Answer:

magnetfiing galss

Explanation:

Answer:

Twenty-two

That's how many human chromosomes are common to both males and females

Answer:

True

Explanation:

Answer: True

Explanation:

im also taking biology lol, i remember writing that in my notes last chapter.

Answer:

the answer is A. specific composition and structure, and contains one or more silicon-oxygen tetrahedrons.

Explanation:

No, based on the available scientific data and records, carbon dioxide (CO2) concentrations in the Earth's atmosphere have not been higher than today's levels over the past 800,000 years.

Scientists have been able to reconstruct past atmospheric CO2 concentrations through various methods, such as analyzing air bubbles trapped in ice cores. These records show that during the interglacial periods of the past 800,000 years, CO2 concentrations typically ranged between 180 and 300 parts per million (ppm).

However, due to human activities, primarily the burning of fossil fuels, CO2 concentrations have been steadily increasing since the industrial revolution. As of my knowledge cutoff in September 2021, the atmospheric CO2 concentration had surpassed 415 ppm, which is significantly higher than any natural variation observed over the past 800,000 years.

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Answer:

zy

Explanation:

zy

Answer:

Hey! im pretty sure the answer is B i did a test on this if its not B Then C!

Explanation:

C. Consider the impact of their actions, is the correct answer.

A is not correct because recycling helps protect the environment and helps boost the economy. B is not correct because plants helps supply oxygen for humans and animals. It is also a food source for some animals and humans. C. is not correct because we need to save energy for a healthier and cleaner planet.

The energy source is the concentration difference of hydrogen ions across the membrane.

The photochemical and electron transport reactions of oxygenic photosynthesis occur at the thylakoid membrane. The lipid composition of the thylakoid membrane is highly conserved among oxygenic photosynthetic organisms, with two galactolipids, one sulfolipid, and one phospholipid.

The primary functions of thylakoids are to trap light energy and convert it into chemical energy forms such as ATP and NADPH. Water is oxidized and oxygen is released during this process. Inside chloroplasts and cyanobacteria, thylakoids are membrane-bound compartments. They are the site of photosynthesis's light-dependent reactions. Both stages of photosynthesis involve the chloroplast. The light reactions occur in the thylakoid.

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Fractional distillation is a process used to separate mixtures of miscible liquids whose boiling points differ by less than 25°C. The experimental setup is similar to the distillation setup, except for the fractionation column filled with glass beads.

The distillation diagram is shown below. First A chemical process that separates a mixture of two or more components with different boiling points. Second heat the mixture until one of the ingredients boils and turns to steam.

In fractional distillation, a mixture of liquids is boiled and the vapors produced travel through glass tubes called fractionation towers and are separated. A fractionation column is placed between the flask containing the mixture and the Y adapter to improve the separation between the liquids being distilled. A method of separating mixtures based on differences in volatility in boiling liquid mixtures.

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Answer:

False

Explanation:

Answer:

An orbit is essentially the motion of an object (be it a planet, a moon, a spacecraft) around a star, moon, or planet. Now a revolution is the movement of an object around an axis of rotation, or a centre, or another object. So the earth revolves around the sun, but the earth is also in orbit around the sun.

Plz mark me brainliest

Answer:

Option A

Explanation:

There are 2 identical Cells and has same original number of

chromosomes!

I hope this helps.

Answer:

Enzymes contain a globular protein part called apoenzyme and a non-protein part named cofactor or prosthetic group or metal-ion-activator.

Explanation: