please help be much appriciated

Answer:

Explanation:

Thankyou

Answer:

B the answer is b

Explanation:

Water is boiled and steam is produced, which is a physical change because the water particles are still water particles, as they are in Option B, because the form is changed rather than the chemical nature.

The physical change is significant as it is reversible, and these changes do not involve a chemical reaction, so the original substance can be altered by reversing the process, such as from ice to water. These processes are used in industrial processes to separate, purify, or refine materials; in cooking and food preparation, such as heating, freezing, and mixing, they are used to prepare food and change its texture, taste, appearance, etc.

Hence, water is boiled and steam is produced, which is a physical change because the water particles are still water particles, as they are in Option B, because the form is changed rather than the chemical nature.

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Answer:

Cell wall. The plant cell wall accounts for the turgidity and the rigidity in plants. The cell wall protects the plant cell from bursting due to the influx of water. Rather than bursting, the cell is able to withstand the osmotic pressure exerted by the water molecules.

The ecological model is divided into various compartments, including those for soil, atmosphere, living things, and debris.

An ecological model is a representation of the general model of nutrient cycling in an ecosystem using boxes and arrows. The compartments are connected by arrows that represent the movement of nutrients.

According to this theory, nutrients travel from the atmosphere to the soil and are then assimilated by living things. Organic material from dead or excreting creatures is transformed into detritus, which bacteria break down to reintroduce nutrients into the soil. Additionally, some nutrients may be lost to the atmosphere as a result of evaporation and volatilization.

The flow of nutrients in an ecological model can be depicted as:

Atmosphere > soil> living organisms> detritus> soil >atmosphere.

Overall, this model emphasises how crucial nutrient cycling is to maintaining the productivity and health of natural systems.

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The ability of RTKs to dimerize is dependent on their phosphorylation status. Phosphorylation of specific tyrosine residues on the RTK allows for dimerization and subsequent activation of downstream signaling pathways.

Therefore, if a mutation occurs such that several of the tyrosines on the RTK cannot be phosphorylated, it is likely that the RTK will have a decreased ability to dimerize.
However, the specific effects of this mutation on RTK dimerization and subsequent downstream signaling pathways will depend on the location and number of tyrosine residues affected. If the mutation only affects a few tyrosine residues, the RTK may still be able to dimerize through other available tyrosine residues, albeit with reduced efficiency. If a larger number of tyrosine residues are affected, the RTK may not be able to dimerize at all.
In either case, the effects of this mutation on RTK function will likely be detrimental, as dimerization and downstream signaling are crucial for RTK-mediated cellular processes such as cell growth, differentiation, and survival. Therefore, it is important to consider the potential consequences of mutations that affect RTK phosphorylation and dimerization when studying their roles in various cellular processes and diseases.

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Answer:

it was increase

Explanation:

Answer:

The endocrine system is a chemical messenger system comprising feedback loops of the hormones released by internal glands of an organism directly into the circulatory system, regulating distant target organs. In humans, the major endocrine glands are the thyroid gland and the adrenal glands.

a) Pattern of bacteria in the different color regions: The highest concentration of bacteria is observed in colors violet-blue and yellow-orange. A low concentration of bacteria is observed in green color. No bacteria is observed in orange-red color.

b)  Hypothesis: Algae exposed to wavelengths between 500 and 600 nm will express the greatest photosynthetic rate.

When following the scientific methodology, researchers must formulate a hypothesis.

A hypothesis is a scientific conjecture, not verified, that requires corroboration. It is a possibility, not a fact. It is a claim of how it works a relationship between two or more variables.

The researcher hypothesizes to predict what is going on or what is expected to occur.

A hypothesis

In the exposed example, the involved variables might be, for instance, wavelength and photosynthetic rate.

Hypothesis

Algae exposed to wavelengths between 500 and 600 nm will express the greatest photosynthetic rate.

We know that during photosynthesis, oxygen is released. The more oxygen is released into the environment, the greater the photosynthetic rate is.

So, a simple way to measure oxygen concentration (and hence, the photosynthetic rate) is to observe the pattern distribution of oxygen-seeking bacteria when exposed to algae under different light conditions.

These bacteria will be more concentrated in areas where there is more available oxygen. So bacteria concentration will be an indicator of oxygen release. And the amount of oxygen is an indicator of the photosynthetic rate.

In the diagram, we can see that,

This pattern of bacteria in the different color regions suggests that

Under these light conditions, the algae photosynthesize more, and more oxygen is released, so more bacteria are attracted.

Under these light conditions, the algae photosynthesize less and less oxygen is released, so fewer bacteria are attracted.

Under these light conditions, the algae do not photosynthesize, no oxygen is released, and no bacteria are attracted.

Note: Please notice that other variables might be considered when analyzing this example.

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Answer:

​Double Helix

Attached to each sugar is one of four bases: adenine (A), cytosine (C), guanine (G) or thymine (T). The two strands are connected by chemical bonds between the bases: adenine bonds with thymine, and cytosine bonds with guanine.

Explanation:

Answer:

Explanation:

The two strands are held together by hydrogen bonds between pairs of bases: adenine pairs with thymine, and cytosine pairs with guanine.

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Answer:

According to Chargaff's rule, if a DNA strand has 30% guanine before to semi-conservative replication, the  percentage of thymine that will have each new strand after replication will be 20% (option A).

Explanation:

A DNA molecule stores the genome of a living organism in a specific sequence of its nitrogenous bases adenine, guanine, cytosine and thymine. By knowing the percentage of a nitrogenous base in the DNA, the percentage of the other bases can be established using Chargaff's base pair rule.

Chargaff was able to establish that in a DNA molecule the ratio purine:pyrimidine is 1:1, so there must be the same amount of guanine as cytosine and a similar amount of adenine for thymine, taking into account the complementarity of the bases.

According to the base pair rule, if in a DNA strand there is 30% guanine, in the molecule there is:

In this case, Chargaff's rule is useful to determine the percentage of thymine that each new strand will have after replication, corresponding to 20%.

Answer:Newton's first law

Explanation:

Friction and gravitational pull are common unbalanced forces that change the motion of objects on the Earth. Friction acts on objects to slow them down, such as a ball rolling across something like a carpet or sand.

Meiosis only occurs in reproductive cells, as the goal is to create haploid gametes that will be used in fertilization. Meiosis is important to, but not the same as, sexual reproduction. Meiosis is necessary for sexual reproduction to occur, as it results in the formation of gametes sperm and eggs.

Answer:

the answer for the number 25 is 14

Answer:

No of three on the dice = 1

No of total outcomes = 6

Probability = no. of favourable outcome / no of total outcomes

Probability of 3 = 1/6

Answer:

B)Fred and Luke

Explanation:

On the pedigree, it is obvious that they suffer from hemophilia because they appear colored, but males(XY) need only one allele for hemophilia to be sufferers.

In hemophilia, it is x linked recessive  disorder in males having X and Y chromosomes, so he need only one x chromosome in recessive manner, hence in pedigree analysis Fred and luke having has hemophilia, hence option b is correct

Hemophilia is a hereditary bleeding disorder in which the blood lacks to clot properly. This can occur for both spontaneous and post-injury or operative bleeding.

On the pedigree, it is observed that they suffer from hemophilia because it is x linked recessive disorder, they appear colored, but males (XY) need only one allele for hemophilia to be sufferers.

Blood contains several proteins known as coagulation factors that can assist in the prevention of bleeding. Although its rare, acquired hemophilia is a serious illness.

Therefore Fred and luke have hemophilia because males having chromosome XY, need only one allele for the disease, hence opton b is correct.

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Answer:

Hmm I'm not sure I joined only a few days ago.

Explanation:

The adaptations of the ground-dwelling animals against limited foods would include longer limbs, stronger grip, and improved agility.

If the availability of food on the forest floor decreases, it is likely that adaptations for climbing trees or reaching the canopy will become more common in the population. This could include adaptations such as:

Over time, individuals with these traits will be more successful in obtaining the fruit they need for better nutrition, and they will pass these traits to their offspring.

The process that allows these adaptations to occur is natural selection, which is the mechanism of evolution that results from the differential survival and reproduction of individuals in a population.

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The response is at puberty, coiled, tubular glands start to develop and start secreting a sticky, cloudy, and possibly odorous substance. These coiled tubular glands also referred to as exocrine glands, secrete fluids right onto the skin's surface.

The subcutaneous tissue's connection of the skin to underlying tissues like muscles is one of its primary functions. The scalp's hair protects the head from the cold. The integumentary system consists of four different types of glands: mammary, sebaceous, ceruminous, and sudoriferous (sweat) glands. Each of these exocrine glands secretes substances outside of the body and cells. Sweat glands are called sudoriferous glands. These are crucial in order to keep the body's temperature stable. Oil-producing sebaceous glands help keep us waterproof, stop bacteria from growing, and protect our hair and skin from drying out. Earwax is produced by ceruminous glands and maintains the eardrum's outer surface flexible and avoids dryness. Milk is produced by mammary glands.

The complete question is:

Coiled, tubular glands produce a sticky, cloudy, and potentially odorous secretion; these glands begin at puberty, Which gland is this?

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Answer:Deoxyribonucleic acid is a molecule composed of two polynucleotide chains that coil around each other to form a double helix carrying genetic instructions for the development, functioning, growth and reproduction of all known organisms and many viruses. DNA and ribonucleic acid are nucleic acids

Explanation:

Explanation:

DNA is a double helical structure with two polynucleotide chains connected by hydrogen bonds .

DNA=Deoxyribonucleic Acid

Answer:

True!

Explanation:

Sometimes an entire ocean closes as tectonic plates converge, causing blocks of thick continental crust to collide. A collision mountain range forms as the crust is compressed, crumpled, and thickened even more. The effect is like a swimmer putting a beach ball under his or her belly—the swimmer will rise up considerably out of the water. A convergent boundary (also known as a destructive boundary) is an area on Earth where two or more lithospheric plates collide. One plate eventually slides beneath the other, a process known as subduction.

The type of structure that refers to particularly stable arrangements of amino acid residues in a protein that give rise to recurring patterns is the secondary structure.

Secondary structure refers to the local folding of a protein's polypeptide chain into specific recurring patterns, which are stabilized by hydrogen bonds between amino acid residues. These recurring patterns are called alpha-helices and beta-sheets, and they play a crucial role in determining a protein's overall three-dimensional structure and function.  Alpha-helices are spiral-shaped structures in which the polypeptide chain is coiled tightly around an imaginary axis. Beta-sheets, on the other hand, consist of extended strands of amino acids that run parallel or anti-parallel to each other and are held together by hydrogen bonds.

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Answer:

Computional model, used to study an outbreak of an infectious disease called influenza.

RT-PCR includes reverse transcriptase, PCR amplification, and gel electrophoresis.

Reverse transcription polymerase chain reaction is an experimental technique that combines the reverse transcription of RNA into DNA and the amplification of specific DNA targets using the polymerase chain reaction.

This is a highly sensitive technique for detecting and quantifying mRNA (messenger RNA). This technique consists of two parts:

Synthesis of cDNA (complementary DNA) from RNA by reverse transcription (RT) and amplification of specific cDNA by polymerase chain reaction (PCR).

The types of PCR are as follows.

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Answer:

On an island in the Arctic ocean, fossils of tropical plants were found. This means that at one point the island had been pointed closer to the equator meaning the plate had shifted.

Explanation:

I am new to this app and this was one question I could answer, hope I helped (:

Answer:

newtons law number two

Microtubules start at the centrosome and then connect to the kinetochores, which are structures at the central region of chromosomes. The centrosome is the main microtubule-organizing center (MTOC) in most animal cells, whereas plant cells lack a typical centrosome.

The two spindle poles are the central region of a chromosome where a kinetochore is connected. Microtubules are a type of cytoskeletal protein filament that plays a crucial role in the mechanics of cell division.

Microtubules, together with actin and intermediate filaments, form the cytoskeleton, which is the structural framework of the cell. Microtubules also transport vesicles and organelles, support cell shape, and mediate cell signaling.

They are also crucial in cell division, serving as a framework for the mitotic spindle, a structure that segregates chromosomes during cell division.

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Gene expression in stem cells is more versatile and pluripotent, allowing them to differentiate into various cell types, while specialized cells have specific gene expression patterns that enable them to perform their specialized functions

Gene expression in stem cells and specialized (differentiated) cells differs due to their distinct roles and functions in the body. Stem cells have the unique ability to differentiate into various cell types, whereas specialized cells have already undergone differentiation and acquired specific functions.

In stem cells, gene expression is more pluripotent, meaning a wide range of genes can be activated or repressed to maintain their self-renewal and differentiation potential. This flexibility allows stem cells to respond to different signals and stimuli, enabling them to give rise to different cell lineages during development or tissue regeneration.

On the other hand, specialized cells have undergone a process called cell differentiation, where specific genes are selectively expressed or silenced to establish their specialized functions and morphology. Gene expression in specialized cells is more restricted and specific, as it is essential for the cell to perform its designated role effectively and maintain tissue homeostasis.

The regulation of gene expression in stem cells and specialized cells involves complex molecular mechanisms, including the activation or repression of transcription factors, epigenetic modifications, and signaling pathways. These mechanisms ensure the appropriate gene expression patterns in different cell types, allowing for proper development, tissue function, and overall organismal health.

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The correct statement about nuclear transport is c. Nuclear import receptors bind to proteins in the cytosol and bring the proteins to the nuclear pores, where the proteins are released from the receptors into the pores for transit into the nucleus.

Nuclear transport is a critical process in eukaryotic cells that allows for the movement of molecules such as proteins and mRNA in and out of the nucleus. The nuclear pores, which are large protein complexes embedded in the nuclear envelope, are the gatekeepers that regulate the movement of these molecules.

The nuclear pores are composed of many copies of several different proteins, including nucleoporins, which form a channel that spans the nuclear envelope. The nucleoporins have disordered segments that fill the channel and allow for the selective passage of molecules based on their size and chemical properties.

Nuclear transport is a highly regulated process that requires the binding of nuclear import receptors to cargo molecules in the cytosol. These receptors then transport the cargo to the nuclear pores and facilitate its translocation through the channel into the nucleus. Nuclear export follows a similar process, but in reverse.

In summary, nuclear transport is a complex process that requires the coordinated action of multiple proteins and mechanisms. The correct statement about nuclear transport is c, which describes the role of nuclear import receptors in facilitating the transit of proteins through the nuclear pores.

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A urinalysis is an examination of urine to identify any abnormalities and evaluate overall health. To know what urinalysis results you would expect for someone being treated for a bacterial infection like strep throat, assuming he or she follows the doctor's orders of amoxicillin, 2x/day; lots of bed rest; and drink lots of fluids.

There are several factors to consider:

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Answer:

C

Explanation:

Single-celled organisms use cell division as their method of reproduction