what occurs during metaphase 1 in meiosis

Answer:

The answer is trabecular.

Explanation:

DNA duplication happens during the S phase of the cell cycle, a part of the interphase before mitosis. This ensures each daughter cell receives an identical copy of the genetic material during cell division.

The DNA, or deoxyribonucleic acid, is duplicated during the S phase of the cell cycle. This is a part of the interphase, which happens before mitosis.

During the S phase, each strand of the DNA molecule is used as a template to synthesize a new, complementing strand, effectively creating two identical copies of the original DNA molecule. This process is critical to ensure that when the cell undergoes division, each daughter cell will receive an identical copy of the genetic material.

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Answer:

a.True

Explanation:

Basalt is an extrusive igneous rock, solid and black. It is the most common type of rock in the earth's crust, and covers most of the ocean floor. The foundations of continents are made mostly of basalt. Basalt is formed by abundant dark minerals such as pyroxene and olivine, which make the basalt color gray or dark black.

The false statement is that 'Lithospheric plates do not move.' Lithospheric plates are constantly moving, albeit slowly, and their movement can cause earthquakes among other geological phenomena.

The statement that is false among the given options is: Lithospheric plates do not move. Lithospheric plates, which are large segments of the Earth's crust, indeed move around the globe at rates typically measured in millimeters to a few centimeters per year. These movements are analogous to the growth rate of human fingernails. Lithospheric plates do move during earthquakes when the stress that has built up along fault lines is released suddenly. They can also move without the occurrence of earthquakes, albeit very slowly. Tectonic plates engage in several types of interactions at their boundaries, including divergent, convergent, and transform motions, which can cause earthquakes and are associated with other geological phenomena such as mountain building and volcanic activity.

The student then added different amounts of fertilizer mixed with distilled water to three of the containers and distilled water alone to one of the containers. The water fleas in all the containers receiving fertilizer.

An element that is necessary or advantageous for plant growth and development or for the quality characteristics of the harvested product of a certain plant species grown in its natural or cultivated environment is known as a mineral plant nutrient.

Plants require 14 vital nutrients for growth and health, which fertilizers give, in addition to the carbon, hydrogen, and oxygen they obtain from the atmosphere and water.

The third main nutrient for crops and plants is potassium. Ores collected for mining are also used to make fertilizers with potassium. The potash rock can be transformed into plant nourishment through a number of chemical processes, including potassium chloride, sulphate, and nitrate.

Therefore, The student then added different amounts of fertilizer mixed with distilled water to three of the containers and distilled water alone to one of the containers. The water fleas in all the containers receiving fertilizer.

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Answer: B.

Explanation: The water fleas in the container with only distilled water

Answer:

decreases the secretion of substances from the pituitary gland that cause growth

Explanation:

Gigantism is a disorder that occurs when the pituitary gland, the internal secretion gland, overproduces growth hormone. It is a disordered growth picture, especially in the arms and legs, and is accompanied by corresponding growth in height. For this reason, we can conclude that the effect of a drug that will act against gigantism will decrease the secretion of growth-causing pituitary substances.

pollen is a generative means of propagation of flowering plants carried by the wind or species that perch on the flower.

pollen can not last long in the wild.

pollen itself is not a male gamete, but each contains a pollen of vegetative (non-reproductive) cells (only one cell in most flowering plants but several other plants) and generative (reproductive) cells that contain two nuclei: a core tube ( which produces pollen tubes) and generative nuclei (which divide to form two sperm cells). A group of cells surrounded by cellulose-rich cell walls is called the intine, and the outer wall resistance consists mostly of sporopollenin called exine.

pollen is produced in microsporangium (which is contained in the anthera flowers Angiosperms, male cones from coniferous plants, or male cones of other plants). pollen comes in a variety of shapes (most often spherical), size, and surface characteristics characteristic of species (see electron micrograph in the top right). Pine pollen, fir, and winged fir. The smallest pollen grains, Myosotis spp., Are about 6 m (0.006 mm) in diameter. Wind-pollen can be as large as 90-100 μm. Pollen studies are called Palinology and are very useful in Paleoecology, paleontology, archeology, and forensics.

In angiosperms, during development anther flowers consist of cell masses that appear indistinguishable, except for partially differentiated dermis. When flowers develop, four groups of sporogenic cells form in anther, fertile sporogenous cells surrounded by sterile cell layers that grow into pollen sac walls, some cells grow into nutritional cells that provide nutrients for microspores formed by the meiotic division of sporogen cells. The four haploid microspores produced from each sporogenous diploid cell are called microsporocytes, after meiotic division. After the formation of the fourth microspora, which is contained by the kalose wall, the construction of the pollen grain wall begins. Exine is what is stored in the fossil record.

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Class : high school

Subject : biology

Keywords : Pollen, microsporangium , produced, vegetative, modification

The junction between an axon and the muscle fiber is called the neuromuscular junction.

The junction between an axon and the muscle fiber itself is called the neuromuscular junction.

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In giving a priority instruction regarding the disease management of the patient a nurse should include the following: (1) Flush entirely the peritoneal pads in the toilet; (2) Place the pads in bio-hazard waste stacks; (3) Put the pads in the patient’s waste carrier; (4) Seal the used pads in a unsoiled paper bag. This should be instructed to a patient who is about to be discharged from the gynecological clinic after the treatment for acute pelvic inflammatory.

Plants have pigments that are not photosynthetically active because:

Photosynthesis is the process of plants converting energy from sunlight and other sources into oxygen which helps in cellular respiration.

The pigment which enables plants to convert energy into food is known as chlorophyll.

One example of a plant pigment that does not play a role in photosynthesis is called anthocyanin. Its job is to give color to the plants.

Therefore, the reason plant pigments are not active in the photosynthesis stage is because they reflect wave lengths and perform other specific functions.

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Skeletal muscle fibers are unusual because they are multinucleated, striated, and have the ability to contract rapidly for voluntary movements but tire quickly.

Skeletal muscle fibers are unique because they are multinucleated, and they have a striated appearance due to a repeating pattern of units called sarcomeres. The multinucleated aspect of skeletal muscle fiber occurs because these fibers are formed from the fusion of developmental myoblasts. Moreover, they have the special ability to contract rapidly but tire quickly, making them suitable for voluntary movements.

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The egg's shell is most similar to the cell membrane, or plasma membrane. Both serve as semi-permeable barriers, offering protection and regulating the exchange of materials.

The part of an egg that is most similar to the cell membrane, often referred to as the plasma membrane, is the egg's shell. The plasma membrane and the egg shell both provide a protective barrier for the inside contents, regulate which materials can pass in or out, and are semi-permeable, meaning they allow certain molecules to pass through, while preventing others.

The plasma membrane is primarily composed of back-to-back phospholipids (a "bilayer"), cholesterol, and various proteins within the membrane, contributing to its functionality and fluidity. Similarly, an egg shell provides protection and regulates the permeability, allowing for the exchange of carbon dioxide and oxygen necessary for the developing embryo in the egg.

It's also noteworthy to mention that similar to the cell membrane in a cell, the egg shell in an egg separates the interior of the egg, containing the albumin and yolk providing nutrients to the embryo, from the external environment, thereby playing a significant role in maintaining a stable internal environment.

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The role of the human body systems, tissues, and cells shows a significant role in individuality because each of them comprises of unique traits that is the characteristic to each individual. Every individual has his or her own DNA that recognizes their individuality.

Alkylating agents would most likely cause the cell to halt at the G₁ checkpoint, where the cell checks for DNA damage before proceeding to DNA replication. However, the G₂ checkpoint also plays a key role in checking for DNA damage or incomplete replication before a cell enters mitosis.

Alkylating agents act by preventing cell division through inhibition of genetic material replication. In terms of cell cycle checkpoints, these agents would most likely cause the cell to halt at the G₁ checkpoint, primarily regulated by proteins Rb, p53, and p21. During the G₁ phase, the cell prepares for DNA replication, which occurs in the subsequent S phase. But if there is a presence of damaged DNA, proteins like p53 halt the cell cycle and call upon enzymes to repair the genetic material. If repair is not possible, p53 can trigger a process called apoptosis to prevent the propagation of damaged DNA.

However, consideration should also be given to the G₂ checkpoint. This checkpoint bars entry into the mitotic phase if it detects DNA damage or incomplete replication, triggering repair mechanisms or a complete halt to the cell cycle. It thus ensures that cells entering mitosis have accurately replicated their DNA.

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Adenosine triphosphate (ATP) is the primary cellular energy currency. When ATP is converted to ADP and a phosphate group, energy is released. This energy is used for various cellular activities, such as muscle contraction or glucose metabolism.

Adenosine triphosphate, or ATP, is the primary energy currency in cells. ATP stores energy in the form of phosphate ester bonds. When these phosphodiester bonds are broken, usually by the removal of a terminal phosphate group, ATP is converted to ADP and a phosphate group, and energy is released. This released energy is used to perform various cellular activities.

For instance, if a cell needs to contract a muscle, it will use the energy from ATP. Similarly, when glucose first enters a cell, a phosphate group is transferred from ATP, forming glucose phosphate and ADP. Once glucose is phosphorylated in this way, it can be stored as glycogen or metabolized for immediate energy.

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Answer:

Primary

Explanation: