Anabaena is a simple multicellular photosynthetic cyanobacterium. In the absence of fixed nitrogen, certain newly developing cells along a filament express genes that code for nitrogen-fixing enzymes and become nonphotosynthetic heterocysts. The specialization is advantageous because some nitrogen-fixing enzymes function best in the absence of oxygen. Heterocysts do not carry out photosynthesis but instead provide adjacent cells with fixed nitrogen, in exchange receiving fixed carbon and reduced energy carriers.
As shown in the diagram above, when there is low fixed nitrogen in the environment, an increase in the concentration of free calcium ions and 2-oxyglutarate stimulates the expression of genes that produce two transcription factors (NtcA and HetR) that promote the expression of genes responsible for heterocyst development. HetR also causes production of a signal, PatS, that prevents adjacent cells from developing as heterocysts
Based on your understanding of the ways in which signal transmission mediates cell function, which of the following predictions is most consistent with the information given above?

Small arteries that are dilated or constricted to control peripheral resistance, and thus blood pressure, are arterioles.

Arterioles are small blood vessels that connect arteries to capillaries. They play a crucial role in regulating blood pressure and blood flow distribution throughout the body. By dilating or constricting their smooth muscle walls, arterioles can adjust the resistance to blood flow in peripheral tissues. When arterioles dilate, the lumen size increases, allowing for increased blood flow and reduced resistance, which can lower blood pressure. Conversely, when arterioles constrict, the lumen size decreases, leading to decreased blood flow and increased resistance, which can raise blood pressure. The constriction and dilation of arterioles are controlled by various factors, including neural, hormonal, and local factors such as metabolic demand. The precise regulation of arteriolar tone is essential for maintaining appropriate blood pressure levels and ensuring adequate perfusion to different organs and tissues in the body.

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Answer:

This is due to lactic acid accumulation in Emma's leg muscles.

Explanation:

In the absence of oxygen in the muscle cells, the cell switches from performing aerobic respiration to lactic acid fermentation. The lactic acid fermentation produces lactic acid as a product, which builds up in the muscle cells of the body causing a burning sensation and pain. This often happens during exercises.

This is the cause of Emma's pain in her lower leg muscles. Lactic acid has been formed and accumulated in the muscle cells of her leg during the exercise with her brother.

Answer:

No.

Explanation:

No, It is not possible to discover a fully preserved organism because after the death of organism, the decomposers feed on the animal and only the skeleton remains from decomposers. With the passage of millions of years, the fossil is not remain fully preserved due to the environmental conditions so that's why it is concluded that it is impossible to discover a fully preserved organism.

Answer:

trees that drop their leaves in colder seasons in order to conserve water

Explanation:

Answer:

Phenotype        Genotype

Normal male         XHY

Normal female XHXH

Affected male XhY

Carrier female XhXH

Explanation:

Answer:

a) Methionine- Serine- Proline- Serine- STOP.

b) UAC- AGA - GGU -

UCG - AUC

c) AUG- UCG- CCA- AGC- UAG

Explanation:

A) The DNA sequence in this question is given as follows: 3 TÁC -AGA - GGT -

TCG - ATC 5'. This sequence undergoes transcription and translation (gene expression) in order to give rise to an amino acid sequence.

The mRNA sequence that will result following transcription is: AUG- UCU- CCA- AGC- UAG

Following translation, each codon in the above mRNA sequence will result in the following amino acid sequence: Methionine- Serine- Proline- Serine- STOP.

B) Anticodons are a group of three nucleotides that are complementary to a codon found on the tRNA molecule. The anticodons for each codon on the mRNA sequence is: UAC- AGA - GGU -

UCG - AUC

C) Silent mutation is a type of substitution mutation in which one or more nucleotide base is replaced by another in such a way that it does not change or alter the amino acid sequence. Using the mRNA sequence: AUG- UCU- CCA- AGC- UAG

A mutated sequence is as follows: AUG- UCG- CCA- AGC- UAG. Note that, G has replaced U in the second nucleotide. However, there is no change in amino acid that results because the same UCU that codes for SERINE is also encoded by UCG.

The single large zygote is converted into a multicellular embryo consisting of smaller cells called blastomeres during cleavage. The answer is E)

Cleavage is the process of rapid cell division that occurs immediately after fertilization. During cleavage, the zygote undergoes multiple rounds of cell division without significant growth, resulting in the formation of a multicellular embryo. The division of the zygote produces smaller cells called blastomeres.

These blastomeres are initially identical and form a solid ball of cells known as a morula. As cleavage progresses, the morula undergoes further cell divisions and transforms into a multicellular embryo consisting of numerous blastomeres.

The main characteristic of cleavage is the division of the zygote into smaller cells without a significant increase in overall size. The embryo formed during cleavage is not yet differentiated into distinct tissue layers or exhibiting specific structural features like a gastrula or blastopore.

Hence, the correct option is: E) multicellular embryo consisting of smaller cells called blastomeres.

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Income tax is collected through payroll deductions, where a certain amount is withheld from an individual's salary before they receive their paycheck.

This amount is then remitted to the government as part of their tax obligations. It refers to the money deducted from an individual's salary before they receive their actual pay. This deduction is mandatory and regulated by the government.

The purpose of income tax is to finance public services and government expenditures. The amount of income tax withheld depends on the individual's income level and the tax rate applicable to their earnings.

By deducting income tax from employees' salaries, the government ensures a steady stream of revenue throughout the year, rather than relying solely on annual tax returns.

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Crossing over plays a crucial role in genetic recombination and evolution.

Crossing over is the exchange of genetic material between two homologous chromosomes during meiosis I. Here are the requirements and consequences of crossing over:

Requirements of crossing over: For crossing over to occur, homologous chromosomes must align precisely early in prophase I so that non sister chromatids can exchange corresponding segments of DNA. Crossing over occurs at the ends of chromosomes, rather than near the centromeres, because segments of DNA near the centromeres cannot break and rejoin easily.

Consequences of crossing over: As a result of crossing over, sister chromatids are no longer identical to each other. Crossing over prevents homologous chromosomes from separating during meiosis I. Therefore, crossing over promotes genetic diversity and produces genetically different offspring. It also assists in shuffling genetic information between the two sets of chromosomes inherited from the parents.

On the other hand, if a crossover occurs in a region where two genes are located close together on the same chromosome, it may disrupt the inheritance of these genes.

In summary, crossing over plays a crucial role in genetic recombination and evolution, but it must occur appropriately for genetic inheritance to remain stable. A crossover that occurs between genes, as well as a crossover that occurs outside of genes, could have significant consequences for the genetic inheritance of offspring.

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Answer:

By comsuming other consumers and producers

Explanation:

Unlike producers consumers can't make their own food

Answer:

proteins. Explanation: The muscle contraction needs two protein that is essential in contraction. The muscle has motor protein myosin and spherical protein actin that are slide on one other in contraction that helps in muscle to contraction.

Explanation:

Answer:

option B

b

b

b

b

b

b

B

b

b

b

b

b

b

b

b

They postulate, "We predict the plant grown in blue light to be higher when we compare the height of the one grown in blue light to that grown in green light.

Plants' vegetative growth is strongly influenced by light with a wavelength of 400–520 nm, which includes light violet, blue, and green. Far red/infrared light with a wavelength of 720–1000 nm is used for germination, however very little absorption happens in this wave band. Plants may do a variety of tasks with the aid of various coloured light. For instance, blue light aids in promoting vegetative leaf growth. Plants can blossom when exposed to red and blue light. Indoor plant growth thrives under cool fluorescent lighting.

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Answer:C

Explanation:

The Sun will illuminate us for billions years whereas the rest of the answer choices can be exhausted and used up completely.

Solar Energy would best be categorized as inexhaustible. So, the correct option is (C).

Resources are divided as renewable or non-renewable. A renewable resource can renew itself at the rate it is used, while a non-renewable resource has a limited supply. Examples of renewable resources are timber, wind and solar while non-renewable resources are coal and natural gas.

Renewable energy is the energy which can be used repeatedly and it is renewed again after a short period of time which is defined as the type of energy resources that can be renewed naturally. Renewable sources of energy can replace the conventional sources of energy which produce harmful gases which are harmful as well as costly.

Non-renewable resources are those which cannot be reused or reproduced, it is used only once and takes a long time to reproduce. These are also not good for the environment. Burning fossil fuels harms our environment.

Thus, Solar Energy would best be categorized as inexhaustible. So, the correct option is (C).

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Distinct vascular bundles arranged in ring. potato is a dicot stem, dicot stem is a part of plant consisting of nodes, internodes. a distinguishing feature of diet stem is vascular bundles are arranged in a ring. Thus potato tuber is a stem, not root that helps in vegetative propagation. And this could be linked to Primordia.

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Answer:

yaaa you knew that air is everywhere it moves

Small organic farms are at a disadvantage compared to organic megafarms primarily because maintaining USDA certification is expensive. Hence, option B is the correct answer.

The USDA certification process for organic farming can be quite costly, putting small organic farms at a disadvantage compared to their larger counterparts. Organic megafarms, with their greater resources and economies of scale, can more easily absorb the expenses associated with certification. In addition, the cost of transporting produce across the country can be a significant burden for small farms that lack the infrastructure and resources of larger operations.

Moreover, although the guidelines for what constitutes an organic farm have been established by the USDA, small farms may still struggle to meet these requirements due to financial constraints or a lack of access to necessary resources. Furthermore, while the USDA does certify small farms, the process can be more challenging for them, as the certification fees and administrative costs may disproportionately affect their limited budgets.

In conclusion, small organic farms face several disadvantages compared to organic megafarms, with the most significant being the financial burden of maintaining USDA certification. These costs, along with other challenges related to meeting organic farming guidelines and transportation, can make it difficult for small organic farms to compete in the market.

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Answer:

B) They contain their own DNA and ribosomes.

Brainliest pls.

Explanation:

Answer:

The energy will go to producing more flower buds

Answer:

Explanation: Examination of conscience is a review of one's past thoughts, words, actions, and omissions for the purpose of ascertaining their conformity with, or deviation from, the moral law.

Answer:

C. New discoveries frequently add to older knowledge in genetics.

Answer:

its C!!

Explanation:

Answer:

Like DNA, RNA (ribonucleic acid) is essential for all known forms of life. ... Messenger RNA (mRNA) carries the genetic information that directs the synthesis of proteins. Some viruses use RNA instead of DNA as their genetic material. Most of the RNA, however, does not code for proteins.

The RNA necessary for DNA to produce proteins that do all work in the cell system.

Transcription:

It is the process by which DNA form mRNA via the RNA Polymerase.

Therefore, the RNA necessary for DNA to produce proteins that do all work in the cell system.

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Answer:

2,4,5

Analogous structures do not indicate a common ancestor.

Analogous structures have the same function but a different structure.

An example of an analogous structure is the wing of a bat and a butterfly.

Explanation:

Answer:

it is X

Explanation:

i gust did the test

Answer:

163 fabric needed to make 250 collars.

Explanation:

Given that,

Length = 1.5 m

Width =137 cm

Number of order = 250

Use fabric = 65%

We  need to calculate the actual length need to make a collar

Using given data

\(Actual\ length =Length\times use\ fabric\)

Put the value into the formula

\(Actual\ length =1.5\times\dfrac{65}{100}\)

\(Actual\ length=0.975\ m\)

We need to calculate the total length of fabric

Using formula for total length

\(total\ length=Actual\ length\times Number\ of\ collars\)

Put the value into the formula

\(total\ length=0.975\times250\)

\(total\ length=243.75\ m\)

We need to calculate the number of fabric

Using formula for number of fabric

\(Number\ of\ fabric=\dfrac{total length}{length}\)

Put the value into the formula

\(Number\ of\ fabric=\dfrac{243.75}{1.5}\)

\(Number\ of\ fabric=162.5\approx 163\)

Hence, 163 fabric needed to make 250 collars.

Answer:

375

Explanation:

trust

Answer:

Please read below:

Explanation:

Photosynthesis is the process by which plants, algae, and some bacteria capture energy from sunlight and use it to produce food (sugars) from carbon dioxide and water. During photosynthesis, oxygen is also released as a by-product. Examples of photosynthetic organisms include plants, algae, and some bacteria.

Cellular respiration is the process by which cells break down food molecules to produce energy, which is then used to power the cell's activities. It involves the conversion of the chemical energy stored in carbohydrates, fats, and proteins into a form of energy that can be used for cellular activities. Examples of cellular respiration include glycolysis and the Krebs cycle.

Photosynthesis and cellular respiration are connected in that they are part of a cycle of energy exchange between plants and animals. During photosynthesis, plants use energy from the sun to convert carbon dioxide and water into oxygen and glucose.

During cellular respiration, animals use oxygen and glucose to produce energy and carbon dioxide. Plants and animals benefit each other in that plants use the carbon dioxide produced by animals to perform photosynthesis, and animals use the oxygen produced by plants for respiration. In this way, plants and animals form a mutually beneficial cycle of energy exchange.

The virus enters the cell by endocytosis. In the cytoplasm, the capsid breaks, releasing the RNA genome. The correct sequence of events in the viral cycle is  2, 1, 5, 4, 3

The virus enters the cell by endocytosis. In the cytoplasm, the capsid breaks, releasing the RNA genome. Replication and gene expression. The RNA genome is copied (this would be done by a viral enzyme, not shown) and translated into viral proteins using a host ribosome.

Viral replication, which occurs inside the host cell, evolves following the steps of

With this information, we can conclude that the correct sequence of events in the viral cycle is 2, 1, 5, 4, 3

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Prenatal androgen exposure refers to the male sex hormones that are secreted in large quantities by the testes of male fetuses.

Prenatal androgen exposure has been related to later differences in behavior in a number of ways: For example, women with higher levels of prenatal androgen exposure tend to show more "masculine" behaviors such as aggression and dominance. Similarly, men with lower levels of prenatal androgen exposure tend to show more "feminine" behaviors such as empathy and emotional sensitivity.

There is also evidence to suggest that prenatal androgen exposure may be related to later sexual orientation, with higher levels of prenatal androgen exposure being associated with a greater likelihood of same-sex attraction in adulthood.

Overall, prenatal androgen exposure appears to play an important role in shaping later behavior, although the precise mechanisms underlying this relationship are not yet well understood.

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