When do two gametes become diploid?

when they halve their number of chromosomes
when they come together during fertilization
when they create copies of themselves

when they grow in size

The  primary molecules of the plasma membrane are lipids , protein , cholesterol and carbohydrates groups.

The plasma membrane also called the cell membrane, is the membrane found in all cells that seperate the interior of the cell from the outside environment. Plasma membrane provides protection for a cell. It also provides a  fixed environment inside  the cell.

The primary components of the plasma membrane are lipids , protein and carbohydrates groups that are attached to some of the lipids and proteins. A  phospholipid is a lipid made by glycerol ,two fatty acids and phosphate linked head group.

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Answer:

400

Explanation:

Scientists tagged 80 hitch. When they capture 100 hitch, 20 are tagged. In order to estimate the population of hitch, we can assume that this proportion is consistent.

This means for every 20 tagged hitch, there are 80 untagged. We know there are 80 tagged total, so we need to multiply 20 by 4 to get it to 80. To keep the proportion equal we also need to multiply the untagged hitch.

\(\frac{20}{80}\) * \(\frac{4}{4}\) = \(\frac{80}{320}\)

Still following the proportion, we have 80 tagged hitch and 320 untagged hitch. 80 + 320 = 400 hitch total.

Answer:

Explanation:

Answer: Mendel considered traits hidden in the first generation to be recessive.

Explanation: Recessive traits, in order to be expressed in an organism's phenotype (physical characteristics) must be homozygous. This means that in a monohybrid cross, which means a trait with only one gene, (E.g. Aa, aa, AA) in order for a recessive gene to be expressed it must be combined with itself. (Examples include aa, bb, cc,)

Answer:

1).Erosion of rocks

Explanation:

Erosion of rocks has effect of hydrosphere on the lithosphere. When the river and streams passing through a region, the water eroded the rocks that comes in their way with the passage of time as well as the bank of the rivers. The speed of erosion depends on the speed of the flow of rivers because speedy flow of rivers causes fast erosion of rocks so we can say that the erosion is the main effect of hydrosphere on the lithosphere.

Answer:D or the last one

Explanation:The last one made the most sense seeing that now the top layer is only the big long mollusk.A would work but thinking of it D makes most sense

The events that happen in meiosis that do not occur in mitosis are:
2. Cross-over occurs
4. Homologous chromosomes line up in pairs at the equatorial plate
5. Daughter cells form that are different from each other and the original cell, due to crossing over and independent assortment of chromosomes during meiosis I and II.

Meiosis is a type of cell division that occurs in sexually reproducing organisms, while mitosis is a type of cell division that occurs in both sexually and asexually reproducing organisms. There are several events that happen in meiosis that do not occur in mitosis, including:

Synapsis and Crossing Over: In meiosis, homologous chromosomes pair up and undergo a process called synapsis, where they physically align and exchange genetic material through a process called crossing over. This results in the formation of chiasmata, which are points of contact between non-sister chromatids that facilitate the exchange of genetic information. This process does not occur in mitosis, as there are no homologous chromosomes to pair up.

Reduction in Chromosome Number: Meiosis consists of two rounds of cell division, resulting in the production of four daughter cells, each with half the number of chromosomes as the parent cell. This reduction in chromosome number is achieved through two rounds of chromosome segregation, with the separation of homologous chromosomes occurring in the first division and the separation of sister chromatids occurring in the second division. In contrast, mitosis only involves one round of cell division, resulting in the production of two daughter cells, each with the same number of chromosomes as the parent cell.

Independent Assortment: During meiosis, the random alignment of homologous chromosomes at the metaphase plate and their subsequent separation during anaphase I leads to the independent assortment of chromosomes, resulting in the formation of genetically diverse daughter cells. This process does not occur in mitosis, as there are no homologous chromosomes to align and separate.

Overall, the events that occur during meiosis, including synapsis and crossing over, reduction in chromosome number, and independent assortment, lead to the production of genetically diverse daughter cells, which is essential for sexual reproduction and the maintenance of genetic variability within populations. These events do not occur during mitosis, which is important for the production of genetically identical daughter cells for growth, repair, and asexual reproduction.

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The spindle assembly checkpoints will occur in the M phase of the mitosis

During mitosis, spindle assembly control/checkpoints (SACs) control the proper attachment and alignment of chromosomes on the spindle. SAC detects errors, induces cell cycle arrest at metaphase, and prevents chromatid separation. The spindle assembly checkpoint (SAC) is critical for maintaining genomic stability as it prevents premature separation of sister chromatids in mitosis and ensures the fidelity of chromosome segregation. The cell cycle is controlled by three of the checkpoints. DNA integrity is assessed at checkpoint G1. Correct chromosomal duplications are assessed at the G2 checkpoint. The attachment of each kinetochore to the spindle filament is assessed at the M control point.

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There is a 50% chance that the offspring of guinea pigs will have white fur or black fur phenotype. In the latter case, the genotype will be heterozygous. This character will be determined by the heterozygous parent as it is the one with different alleles, the white fur guinea pig will always always transmit the recessive allele b to its offspring.

Answer:

global warming

Explanation:

it will make agriculture very hard

The blood's pH is slightly acidic, but the rest of the following statements about blood are accurate. The correct answer is option(b).

Blood is a specific carcass fluid. It has four main components: red body fluid, cardinal blood containers, cells that eat bacteria and fungi, and platelets. Blood has many different functions, containing: moving oxygen and fibers to the lungs and tissues. making ancestry clots to prevent glut ancestry loss.

RBCs are depressed containers outside the nucleus in persons; as known or named at another time or place erythrocytes. RBCs contain the iron-rich protein named hemoglobin; which presents blood allure crimson color. RBCs are ultimate copious ancestry containers produced in cartilage marrows. Their main function searches to transport oxygen from and to various tissues and means.

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Answer:

During anaphase, each pair of chromosomes is separated into two identical, independent chromosomes.

It is important because anaphase ensures that each daughter cell receives an identical set of chromosomes, when anaphase doesn't occur properly faulty cells which aren't identical may be produced

Each pair of chromosomes divides into two identical, independent chromosomes during anaphase. Anaphase is crucial because it ensures that each daughter cell obtains an identical set of chromosomes.

Mitosis is a process of cell division. The process occurs in all eukaryotic cells. The process occurs in four stages. The process divides the cell. The parent cell produces an identical daughter cell.

Therefore, during anaphase, each pair of chromosomes splits into two identical, independent chromosomes.

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Answer: Two items you might purchase in a grocery store that are sold in metric units are bread and boxes of cereal.

Explanation:

A triplet codon is a DNA or RNA molecule that codes for a specific amino acid through a series of three subsequent nucleotides. Some codons act as start or stop signals for translation.

The triplet code, made up of three nucleotides, identifies a single amino acid.

Here we can see ‘UUG’ codes for LEU

‘GGU’ codes for ‘GLY’

‘UAU’ codes for TYR

What is triplet codon?

It is a particular sequence of three nucleotides that is used as a component of the genetic code to specify an amino acid for a particular protein or to start or stop protein synthesis.

A codon is a group of three nucleotides on a messenger ribonucleic acid (mRNA) that designates one of the 22 amino acids that are capable of forming proteins. The order in which these amino acids appear on the messenger RNA dictates the primary structure of the protein that will be produced.

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The diencephalon develops into three primary structures: the thalamus, the epithalamus, and the third structure is the hypothalamus.

A portion of the brain called the diencephalon develops during embryonic development. The thalamus, epithalamus, and hypothalamus are only a few of the parts that make it up.

A key component of the diencephalon, the thalamus serves as a hub for the transmission of sensory data. It gathers sensory information from numerous body parts and transmits it to the cerebral cortex's relevant areas, where the cerebral cortex processes and interprets the sensory inputs.

A tiny area called the epithalamus can be found near the back of the diencephalon. It contains the pineal gland, which releases the hormone melatonin, which controls various biological rhythms as well as sleep-wake cycles.

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Having both an activator and a repressor protein in gene regulation provides several advantages. Firstly, it allows for a more fine-tuned control of gene expression.

Activator proteins stimulate gene transcription, while repressor proteins inhibit it. This allows the cell to regulate the level of gene expression, ensuring that the right amount of protein is produced at the right time.
Secondly, having both an activator and a repressor protein can provide a rapid response to changing conditions. For example, if the cell suddenly requires a specific protein, an activator protein can quickly stimulate its production. Conversely, if the protein is no longer needed, a repressor protein can rapidly shut down transcription. This rapid response is crucial for the cell to adapt to changing environmental conditions and maintain homeostasis.
Lastly, having both an activator and a repressor protein provides redundancy in gene regulation. If one protein malfunctions, the other can compensate and ensure that the appropriate level of gene expression is maintained. This redundancy is essential for the cell to avoid harmful effects resulting from gene expression being too high or too low.
In summary, having both an activator and a repressor protein provides fine-tuned control, a rapid response to changing conditions, and redundancy in gene regulation. All of these advantages are crucial for the cell to maintain homeostasis and ensure proper gene expression.

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Spacecraft that carry instruments to collect data about objects in space are called probes because they are designed to probe or explore and investigate different aspects of space.

Probes are usually unmanned spacecraft that are sent on missions to explore different objects in space such as planets, asteroids, and comets. These spacecraft are equipped with a variety of scientific instruments such as cameras, spectrometers, and magnetometers that collect data and send it back to Earth. The data collected by probes helps scientists to better understand the properties and characteristics of objects in space and can provide valuable information about the history and evolution of the universe.

The term "probe" is derived from the Latin word "probus" which means "good, honest, virtuous, or thorough". In the context of spacecraft, the term "probe" refers to the thorough and systematic exploration and investigation of objects in space. Probes are designed to travel long distances, withstand extreme temperatures and radiation, and operate for extended periods of time in harsh and unforgiving environments. The scientific data collected by probes can help to answer some of the most fundamental questions about the nature of the universe and our place in it.
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The skeleton gives shape for the body, allows movement, support and protect the organs, produce bllod cells, and stores minerals. Being a true fact that it supports the body's softer tissues.

Answer:

The answer is simple.

Explanation:

B, because this is the only apparent answer. It is being transported from something. I'm sure there's some scientific information to back this up.

The reason I said that is because I'm only in 7th grade, and I'm not yet learning about that in science. But you can't blame me for trying. I'm glad to help out if this is correct, but I'm sorry if this is no help.

Answer:

B) from the red and violet portion of the electromagnetic spectrum

Explanation:

it is a Chlorophylls

Thymus gland has functions as part of the endocrine system by secreting a hormone that functions as part of the endocrine and immune system.

They are a type of sealed lead acid type batteries.

What are batteries?

One or more electrochemical cells with external connections for powering electrical equipment make up an electric battery, which is a source of electric power. A battery's positive terminal functions as the cathode and its negative terminal as the anode while it is delivering electricity. The source of the electrons that will go from the terminal labeled "negative" to the terminal labeled "positive" is an external electric circuit. Redox reactions transform high-energy reactants into lower-energy products when a battery is coupled to an external electric load, and the free-energy difference is sent to the external circuit as electrical energy. In the past, a device made of numerous cells was expressly referred to as a "battery," but today, devices made of a single cell are also included in this definition.

Absorbed glass mat batteries have the electrolyte absorbed within a mat of fine glass fibers, and are a type of lead acid type batteries.

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Both the blue sea and the dolphin are made up of atoms.

The term atom has to do with the smallest particle of a substance that could take part in a chemical reaction. We know that all substances in the universe are composed of atoms. Atoms are found in the food we eat, the clothes we wear and even in the air we breathe.

As such atoms are everywhere in the universe. Living things are also composed of different kinds of atoms in differing proportions. Looking at the image as we can see it, there is the blue sea and there is a dolphin. Both the blue sea and the dolphin are made up of atoms.

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The stress-induced sympathetic stimulation of the adrenal medulla causes the secretion of catecholamines which include Epinephrine and norepinephrine.

The adrenal medulla secretes catecholamines hormones that help the body respond to stress. Catecholamines include epinephrine and norepinephrine, also known as epinephrine and norepinephrine. Under stress, the adrenal glands respond quickly by increasing the secretion of glucocorticoids and catecholamines into circulation.

These hormones in turn affect metabolism supplying energy to the vascular system to raise blood pressure and prevent the immune system from becoming over-activated. Visceral stimulation is the physiological stimulation of catecholamine secretion. Her ACh is released from nerve endings in the adrenal medulla when splanchnic nerves are stimulated.

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Sympathetic stimulation by stress in the adrenal medulla causes the secretion of the catecholamines epinephrine and norepinephrine.

A type of neurohormone (a chemical substance made by nerve cells and used to send signals to other cells). Catecholamines are important in stress responses. High levels can cause high blood pressure, headaches, sweating, heart palpitations, chest pain, and anxiety. Epinephrine is also known as adrenaline.

A catecholamine test measures the amount of these hormones in the urine or blood. Higher than normal levels of dopamine, norepinephrine, and/or epinephrine can be signs of a serious health condition.

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Answer:

it should be the Small Intestine

C) is the right option

Bacteria typically have one chromosome that is circular , whereas eukaryotes have many chromosomes that are linear.

Bacterial chromosomes are found in a nucleoid, a distinct cytoplasmic structure that contains double-stranded DNA coated with histone-like proteins. Although most bacteria appear to have a single large circular chromosome, this is not always the case. Bacteria typically have a single circular chromosome that is a few megabases in size. They frequently contain plasmids ranging in size from a few to one hundred or more kilobases. In some cases, the plasmids are as large as chromosomes.

Eukaryotes typically have multiple pairs of linear chromosomes that are all contained in the cellular nucleus and have distinct and changeable forms. They become more tightly packed during cell division, for example, and their condensed form can be seen with a light microscope.

Eukaryotic chromosomes are made up of chromatin, which is made up of two complementary strands of DNA wrapped tightly around histones. The chromatin structure is scaffolded, with three distinct levels. First, the DNA is wrapped around histone clusters to form nucleosomes that are linked by linker DNA.

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Answer:

206

Explanation:

humans have 206 bones

Answer:

El ciclo cardíaco consta de dos períodos i. mi. diástole y sístole.

Explicación:

El ciclo cardíaco consta de dos períodos i. mi. La diástole es aquella durante la cual el músculo cardíaco se relaja y se llena de sangre, mientras que la sístole es un período de contracción y bombeo de sangre. La diástole ventricular es el momento en el que las dos cámaras inferiores del corazón conocidas como ventrículos se relajan para permitir que la sangre fluya hacia adentro. La diástole auricular es el momento en que las dos cámaras superiores del corazón llamadas aurículas se relajan y permiten que la sangre fluya en.