Cell differentiation occurs when various genes are expressed to a different extent in different cells. What does it mean for a gene to be "turned off," or not expressed?


A. Transcription into RNA does not occur for that gene.

B. That gene is removed from the cell's DNA.

C. The RNA for that gene is not translated into protein.

D. The proteins sequenced by that gene are broken down inside the cell.

Answer:

Well for instance, DNA polymerase is an enzyme that assists in the replication process by catalyzing the addition of nucleotides to the growing chain of DNA.

Answer:

The typical human karyotypes contain 22 pairs of autosomal chromosomes and one pair of sex chromosomes (allosomes). The most common karyotypes for females contain two X chromosomes and are denoted 46,XX; males usually have both an X and a Y chromosome denoted 46,XY.

Explanation:

This is an example of alpha-hemolysis. Alpha-hemolysis is a type of hemolysis (breakdown of red blood cells) that occurs on blood agar plates. It is characterized by a greenish or yellowish discoloration around bacterial growth.

When the plate is held up to a light source, the yellow area appears transparent due to the partial breakdown of red blood cells. In alpha-hemolysis, the bacteria produce hydrogen peroxide, which oxidizes the hemoglobin in red blood cells. This oxidation reaction leads to the greenish or yellowish discoloration of the agar. However, the hemolysis is not complete, resulting in a partial breakdown of red blood cells and the formation of a transparent zone around the bacterial growth. It is important to note that different types of hemolysis, such as beta-hemolysis (complete hemolysis) and gamma-hemolysis (no hemolysis), can present with different appearances on blood agar plates. The specific characteristics observed can provide valuable information for bacterial identification and classification.

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(a) Some members of this kingdom are decomposers, showing ecological convergence with the fungi is not true of the kingdom Aveolata .

Kingdom Alveolata comprises of the organisms which are eukaryotic. They are characterized by the presence of cortical alveoli, mitochondria with tubular cristae and the organisms may be free-living or parasitic. Their mode of nutrition is majorly autotrophic although some heterotrophic organisms are also present. Alveolates have mitochondria with tubular cristae (invaginations), and cells often have pore-like intrusions through the cell surface. The group contains free-living and parasitic organisms, predatory flagellates, and photosynthetic organisms.

Decomposers are the organisms which feed upon the organic material by the breaking down of dead organisms. These organisms are also known by the name detritivores. The examples are: fungi, insects, earthworms, and some bacteria.

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Answer:

The total amount of energy remains the same during the transformation.

Explanation:

Before proceeding to the cerebral cortex, input from all sensory systems except smell converges on the thalamus. It is an important relay station that processes, prioritizes, and directs sensory information to the cerebral cortex, which then perceives the sensation.

The thalamus is responsible for processing and relaying sensory information from the eyes, ears, skin, and other organs to the appropriate part of the cerebral cortex.The thalamus is divided into subregions that receive and process specific sensory information. The thalamus receives sensory input from all other senses, with the exception of smell. The thalamus is responsible for processing and relaying sensory information to the cerebral cortex. It plays an important role in the integration of information from different sensory modalities.

The thalamus is a vital relay station that processes and directs sensory input to the cerebral cortex. It is the area where all sensory information except smell converges before continuing on to the cerebral cortex. The thalamus is divided into various subregions that receive and process specific types of sensory information, such as touch, hearing, vision, and taste. The thalamus then directs this information to the appropriate part of the cerebral cortex, which is responsible for perception. The thalamus is also responsible for regulating awareness, sleep, and wakefulness, as well as playing a role in attention and memory.

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Explanation:

The menstrual cycle begins as FSH stimulates development of an ovarian follicle. As this follicle matures, it begins producing a small but steadily rising amount of estradiol. This low level of estradiol causes: Negative feedback: inhibition of FSH and LH secretion.

At a synapse, the neuron that responds to the neurotransmitter is the postsynaptic neuron.

The synapse is the junction between two neurons, where communication occurs. When an action potential reaches the presynaptic neuron, it releases neurotransmitters into the synapse. These neurotransmitters diffuse across the synaptic cleft and bind to receptors on the postsynaptic neuron. The postsynaptic neuron contains these receptors, which are specific to certain neurotransmitters. The binding of neurotransmitters to these receptors triggers a response in the postsynaptic neuron, such as the generation of an action potential or the modulation of its activity. Therefore, the postsynaptic neuron is the one that responds to the neurotransmitter released by the presynaptic neuron.

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The answer is B since that's the definition of artificial selection ,selective breeding made by humans

Answer:

Thomas Alva Edison was an American inventor and businessman who is best known for his contributions to the development of the electric light bulb and the phonograph. Born in Milan, Ohio, in 1847, Edison had a difficult childhood and was forced to leave school at an early age to help support his family. Despite this, he developed a love for science and technology and began experimenting with electrical devices at an early age.

Edison's first major invention was the electric light bulb, which he developed in 1879. This revolutionary invention changed the way people lived and worked, and it helped to usher in the era of electricity. Edison also invented the phonograph, which was the first device that could record and play back sound. In addition to these inventions, Edison was also responsible for a number of other important technological innovations, including the motion picture camera and the first commercially viable incandescent light bulb. He died in 1931 at the age of 84.

Answer:

Answer:

motor unit

The impulses that initiate muscle contraction originates in the. brain or spinal cord. A group of muscle cells stimulated by a single motor neuron is known as a. motor unit

A single motor neuron, however, can innervate many muscle fibers. The combination of an individual motor neuron and all of the muscle fibers that it innervates is called a motor unit. The number of fibers innervated by a motor unit is called its innervation ratio.

About 245 billion years ago, the first Alligator ancestor was evolved.

A process of development of living organisms from earlier forms in the history until now, is called evolution. It can also be defined as development of organisms over time in response to their environment.

During evolution of an alligator, first alligator ancestor evolved around 245 billion years ago that is late Triassic period. Earliest alligators were Postosuchus which was different from modern alligator in three aspects:

Therefore, above evidences describes evolution of alligators.

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Answer: The Alaska blackfish survives in water with temperatures of 5ºF by producing chemicals that lower the freezing temperature of cellular fluids. This keeps the fluids of the fish from freezing, allowing it to survive.

Answer:

The Alaska blackfish survives in water with temperatures of 5ºF by producing chemicals that lower the freezing temperature of cellular fluids. This keeps the fluids of the fish from freezing, allowing it to survive.

Explanation:

they eat co7s after breaking it will become poop!!!

If an individual has sickle cell disease and no one else in their immediate family has it, there are a few possible explanations:

Genetic Mutation: Sickle cell disease is caused by a mutation in the gene responsible for producing hemoglobin, the protein that carries oxygen in red blood cells. It is possible that the individual had a spontaneous mutation in this gene, leading to sickle cell disease, even if it is not present in their immediate family.

Ancestral Inheritance: Sickle cell disease is more prevalent in certain populations, particularly those with African, Mediterranean, Middle Eastern, or Indian ancestry. If the individual has distant ancestors from these regions, it is possible that they inherited the disease-causing gene from them, even if it skipped several generations in their immediate family.

Unrecognized Carriers: Although sickle cell disease may not be present in the immediate family, it is possible that some family members may be carriers of the sickle cell trait. Carriers do not have the disease but can pass the gene to their children. If both parents are carriers, there is a chance that their child may have sickle cell disease.

It is important to consult with a medical professional and undergo genetic testing to determine the specific cause and inheritance pattern in individual cases of sickle cell disease.

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Answer:

1/2

Explanation:

Hope this helps!!!

Could I have brainliest pls

Answer:1/2

Explanation:

Sphingolipids are a class of lipids with an unusual structure composed of a long chain sphingoid base, a fatty acid, and a polar head group. So, options A, B, and C are correct.

Sphingolipids have a unique role in the body, contributing to membrane architecture and signalling. Sphingosine, a long-chain amino alcohol, is a critical component of sphingolipids, and it is a precursor to many sphingolipid metabolites.

Sphingolipids are named after their structure, which includes a long-chain sphingoid base backbone instead of a glycerol backbone like other membrane lipids. Sphingoid bases, the backbone of sphingolipids, are long-chain amino alcohols, such as sphingosine, which includes a long, unsaturated hydrocarbon chain with a trans-double bond near the middle of the molecule and a primary amino group at one end.

Sphingolipids have a hydrophobic tail with a single fatty acid molecule attached to the backbone, as well as a hydrophilic head group that protrudes from the membrane. The polar head groups are diverse, including sugars, phosphates, choline, and ethanolamine, among other things.

Sphingolipids have a sphingosine tail, a fatty acid tail, and a polar head group. Both A and B are correct as sphingosine tail and fatty acid tail are present. The polar head group is also present, and it can be composed of a variety of different molecules. Ringed structures are not one of the chemical groups of sphingolipids.

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Answer:

The most plausible explanation is that the different types of cells had different rates of absorption and retention of the radioactive iodine. Cells with higher levels of radioactivity after treatment may have had higher rates of absorption and/or retention than other cells, resulting in a higher concentration of iodine within the cell.

Explanation:

The integumentary system is composed of hair, skin, and nails, and its primary function is to protect the body from the external environment. This system of protection is similar to an animal cell organelle known as the cell membrane.

The cell membrane is made up of a phospholipid bilayer that serves as the barrier between the cell and its environment. It is responsible for regulating the movement of substances in and out of the cell and protecting it from environmental hazards.

In the same way that the integumentary system protects the body from the external environment, the cell membrane protects the cell from its environment.

It acts as a barrier to keep harmful substances out and to keep vital substances in. It also acts as a shield against physical and chemical damage.

Furthermore, the cell membrane is composed of proteins that play a role in cell-cell communication and cell signaling, which means that it can also help the cell recognize and respond to its environment.

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Along the fault, earthquakes occur as the Pacific Plate, which is on the west, shifts northwestward in relation to the North American Plate, which is on the east.

In western California, two of these tectonic plates collide, and the San Andreas fault separates them. Along the fault, earthquakes occur as the Pacific Plate, which is on the west, shifts northwestward in relation to the North American Plate, which is on the east.

No, earthquakes with a magnitude of ten or higher are impossible. The length of the fault where an earthquake occurs has an impact on its magnitude. That is, the larger the earthquake, the longer the fault.

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Answer:

hypotonic as a hypotonic solution

Explanation:

would cause water to enter the cells, thereby making them burst.

(a) Mean number of donors who have type O negative blood Mean of a population (μ) is found by adding up all the values and dividing by the number of values. So, the formula for calculating the mean of a population is:

(b) Standard deviation of the number of donors who have type O negative blood:Standard deviation is a measure of how much the data in a set is spread out. It is given by the formula:

O negative blood is the type most commonly used for transfusions when the patient's blood type is unknown. The O negative group is most often used in emergency cases, trauma, surgery, because this type is universal. However, O negative blood group can only receive O negative blood. O blood group is divided into two types Blood type O that has the rhesus antigen is called blood type O positive. Blood type O that does not have the rhesus antigen is called blood type O negative.

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Explanation:

Retroviruses. Retroviruses are viruses that are able to reverse transcribe their RNA genome into DNA, which is then integrated into a host genome.

Proviruses are integrated viral genomes that replicate. Retroviruses can reverse transcribe their RNA genome into DNA before integrating with the host genome.

A virus is a type of infectious agent that is submicroscopic in size and can only replicate itself inside the living cells of an organism. Viruses are able to infect all forms of life, including animals, plants, and microorganisms of all kinds (such as bacteria and archaea).

A provirus is a stage in the process of viral replication in which the viral genome becomes integrated with the host DNA. A retrovirus, on the other hand, is an RNA virus that is capable of performing reverse transcription on its RNA genome in order to produce DNA before integrating with the genome of its host.

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Answer:

4, based on the assumption that the R allele is dominant over the r allele, and that the T allele is dominant over the t allele.

Explanation:

Any bush with a dominant petal color allele (R) will have red petals. This includes Rr and RR.

Any bush with a dominant bush size allele (T) will have a tall bush. This includes Tt and TT.

The only way to acquire a short bush or pink petals is to have two recessive alleles together (tt, rr).

RRTT, RrTT, RRTt, and RrTt -> red petals with tall bushes

RRtt, Rrtt -> Red petals with short bushes

rrTt, rrTT -> pink petals and tall bushes

rrtt-> pink petals with short bushes.

These are the four phenotype variations possible in this dihybrid cross.

The term used to describe how the sensory and motor system develop and are used together to develop posture and balance is "coupling."

Coupling refers to the coordination and integration of sensory information from various sources (such as vision, proprioception, and the vestibular system) with motor responses to maintain stable posture and balance. It involves the reciprocal relationship between sensory input and motor output, where sensory feedback helps guide and adjust motor responses to maintain equilibrium. Coupling plays a crucial role in the development and maintenance of postural control throughout life.

Therefore, option B. Coupling is correct.

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When looking at a somatic diploid cell in G2 and seeing that there are 36 chromosomes present, there will be 18 pairs of homologous chromosomes.

Somatic cells are cells that make up the body of an organism that are not used for sexual reproduction. A diploid cell is a cell that has two sets of chromosomes. Each set has 23 chromosomes, and the diploid cell contains 46 chromosomes total. A pair of homologous chromosomes refers to two chromosomes with the same size, shape, and set of genes.The cell cycle is a process that occurs in cells. It consists of various stages, each with its specific characteristics. The cell cycle can be divided into two main stages: interphase and the mitotic phase.

Interphase is the period in which cells prepare for division. G1, S, and G2 are the three phases of interphase. During G1, cells grow and develop. DNA replication occurs in S phase, and cells prepare for mitosis in G2 phase. Mitosis, which is the second stage, is where cells divide to produce two daughter cells. The daughter cells are genetically identical to the parent cell, and each daughter cell receives a set of chromosomes.

There are 18 pairs of homologous chromosomes in a somatic diploid cell in G2 with 36 chromosomes present.

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