During meiosis, homologous pairs of chromosomes can exchange pieces of dna after they synapse.

a. True
b. False

The structure shown by a human arm and wings of bat is an excellent illustrations of homologous structures. Because both bats and people are mammals, they have a common ancestor.

The wing of a bat and a human arm are two well-known examples of homologous structures. Because they are both mammals, they certainly share a same evolutionary ancestor and share a similar internal bone structure.

Tetrapod forelimbs are converted into bat wings. As mammals, bats have skeletal components in their wings that are morphologically similar to those in other tetrapod forelimbs.

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Answer:

Plant Group Dominant Generation Vascular Tissue Pollen Seeds Fruits or Flowers

Bryophytes Gametophyte No No No No

Ferns Sporophyte Yes No No No

Gymnosperms Sporophyte Yes Yes Yes No

Angiosperms Sporophyte Yes Yes Yes Yes

Bryophytes are a group of small, non-vascular plants that include mosses and liverworts. The dominant generation in bryophytes is the gametophyte, which is the generation that produces gametes, or reproductive cells. Bryophytes do not have vascular tissue, pollen, seeds, fruits, or flowers.

Ferns are a group of larger, non-vascular plants that reproduce using spores. The dominant generation in ferns is the sporophyte, which is the generation that produces spores. Ferns have vascular tissue, but they do not have pollen, seeds, fruits, or flowers.

Gymnosperms are a group of seed plants that reproduce using seeds. The dominant generation in gymnosperms is the sporophyte, which is the generation that produces seeds. Gymnosperms have vascular tissue, pollen, and seeds, but they do not have fruits or flowers.

Angiosperms are a group of flowering plants that reproduce using seeds contained within fruits or flowers. The dominant generation in angiosperms is the sporophyte, which is the generation that produces seeds. Angiosperms have vascular tissue, pollen, seeds, fruits, and flowers.

Explanation:

Any whole group that shares at least one trait is referred to be a population. People do not make up all populations. Populations can include, but are not limited to, individuals, animals, organizations, structures, buildings, cars, farms, objects, or occasions.

a community's inhabitants who belong to the same species as one another. A population's characteristics are influenced by things like density, sex ratios, birth and death rates, emigration, and immigration.

A population can be all the students at a particular school. All of the pupils enrolled at that school at the time of data collection would be included.

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Tour of a plant cell structures that are not in animal cells are cell walls and chloroplasts.

Plant cells and animal cells are cells with a complex nucleus with a nuclear envelope consisting of two membranes. Both of these cells belong to the eukaryotic cell type.

Animal and plant cells have many of the same structures and organelles. However, there are several structures and organelles in plant cells that animal cells do not have, namely the cell wall and chloroplasts. The cell wall in young plant cells is made of pectin and in mature plant cells it is formed from cellulose which is rigid so that it gives shape to plant cells which tend to be fixed. While the outer part of plant cells is the plasma membrane which consists of phospholipids and proteins. Another structure that only exists in plants, namely chloroplasts, namely plastids that contain chlorophyll. With the help of chlorophyll, plant cells can make their own food with the help of sunlight.

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Answer:

Similar body parts may be homologous structures or analogous structures.

Explanation:

Similar body parts may be homologous structures or analogous structures. Both provide evidence for evolution. Homologous structures are structures that are similar in related organisms because they were inherited from a common ancestor. These structures may or may not have the same function in the descendants.

During the mating process, each snail lays around 80 eggs about 3-6 days after mating. Each snail digs 2–4cm hole in the soil with its foot to lay the eggs that hatches two weeks later.

When conditions are optimal that are : warm weather and high humidity, snails reproduce as frequently as once a month. Garden snails' reproduction is so fast that average snail can lay 86 eggs per cycle, with an average of five reproductive cycles a year. Each individual snail can lay 430 eggs a year.

Once they are sexually mature, their sex organs acquire necessary conditions to reproduce, but they can begin mating later.

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The structure of a DNA molecule is arranged in Double-helix.

On April 25, 1953, Watson and Crick published their findings in a one-page paper titled "A Structure for Deoxyribose Nucleic Acid." The paper was accompanied by a diagram of the double helix created by Crick's wife, Odile.

A double helix of two complementary nucleotide strands held together by hydrogen bonds between G-C and A-T base pairs makes up each DNA molecule. Duplication of the hereditary data happens by the utilization of one DNA strand as a layout for the development of an integral strand. The instructions for every protein that an organism will ever produce are contained in the genetic information that is stored in its DNA. DNA is housed in the cell nucleus of eukaryotes.

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The average gestation for a full-term infant is 40 weeks weeks, while an infant born at 37 weeks is considered pre-term.

Gestational period refers to the span of time between conception and delivery. During this stage, the baby develops and grows inside the mother's womb. Gestational age is the phrase that describes a pregnancy's stage of development most frequently.

Between 38 and 42 weeks is the usual gestational period. Premature birth refers to births that occur before 37 weeks. Babies who are born postterm are those who are more than 42 weeks gestation.

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Answer:

d.streptococcus

Explanation:

cell cycle is the series of events which take place from a stage of mature mother cell to the stage of completely divided independent daughter cells in a highly ordered manner regulated with time.In streptococcus the cell cycle occurs in a highly ordered manner.

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Cell cycle occurs in Nostoc. Therefore, option (A) is correct.

The cell cycle is the process by which cells grow and divide. It is a series of stages that all cells go through, from the time they are first formed until they divide into two new cells. The cell cycle can be divided into two main phases: interphase and the mitotic phase. During interphase, the cell grows and prepares for division.

The mitotic phase is when the cell actually divides, producing two identical daughter cells. The cell cycle is essential for the growth and development of all organisms, as it allows cells to replicate and differentiate into the various cell types that make up the body. Dysregulation of the cell cycle can lead to problems such as cancer, in which cells divide uncontrollably.

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The one glyceraldehyde-3-phosphate molecule is pulled out of the Calvin cycle for glucose synthesis.

The Calvin cycle is interrupted when one of the G3P molecules contributes to the production of the carbohydrate molecule, which is often glucose. It takes six cycles of the Calvin cycle to create one carbohydrate molecule since it contains six carbon atoms. The system can become ready for the carbon-fixation stage thanks to the regeneration of RuBP by the leftover G3P molecules. RuBP regeneration also makes use of ATP. The entire calvin cycle operates on the product of light reaction that are ATP and NADPH

Hence, the Calvin cycle regenerates initial molecules.

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Direct observational evidence, the presence of homologies and fossils, and specific biogeographical patterns all lend support to the hypothesis of evolution.

Four variables combine to cause evolution: (1) the capacity for a species to proliferate; (2) genetic variety among individuals within a species as a result of mutation and sexual reproduction; (3) competition for the environment's finite supply of resources that people require.

The five components of Darwin's theory of evolution, generally known as Darwinism, are "evolution as such," common descent, gradualism, population speciation, and natural selection.

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The primary goal of photosynthesis is to transform solar radiation into nutrient-rich chemical energy. The process by which organisms' mitochondria break down sugar in the presence of oxygen to produce energy in the form of ATP is known as cellular respiration.

To fuel cellular respiration, photosynthesis uses the energy it produces. During photosynthesis, solar energy is used, collected, and stored in the bonds of glucose molecules.

While photosynthesis utilizes carbon dioxide and releases oxygen, cellular respiration uses oxygen and creates carbon dioxide. We and the majority of other organisms use the released oxygen.

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No. atherosclerosis is not a normal aging change.

A common ailment called atherosclerosis arises when a sticky substance called plaque accumulates inside your arteries. The most common reason for death in the US is a condition related to atherosclerosis. Atherosclerosis affects almost 50% of Americans between the ages of 45 and 84, yet they are unaware of it.

Atherosclerosis is not always a normal aspect of aging because it has various controllable risk factors. Your arteries become harder and narrower as a result of plaque buildup inside their walls, which lowers the amount of oxygen-rich blood that can reach your organs and other body parts.

A deposit of plaque in the inner lining of the artery results in atherosclerosis, which is a thickening or hardening of the arteries. Risk factors may include high cholesterol and triglyceride levels, high blood pressure, smoking, diabetes, obesity, physical activity, and eating saturated fats.

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Food abundance is an example of a biotic factor that is also a density dependent factor. Therefore, option (D) is correct.

Food abundance is an example of a factor that is a density-dependent factor. Density-dependent factors are factors that have a greater impact on a population as the population size increases. These factors include resources such as food, space, and shelter, which become more limiting as the population size increases.

In contrast, density-independent factors are factors that have the same impact on a population regardless of the population size. Examples of density-independent factors include natural disasters and changes in the physical environment such as temperature or rainfall.

Therefore, the correct answer is "biotic; dependent" (d).

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Answer:

Mitochondria

Explanation:

Mitochondria is the organelle which is involved in cellular respiration. It is known as the power house of the cell.

The membrane of mitochondria is specialized for aerobic respiration.

Increased sodium intake or retention is not among the causes of hypernatremia.

People who don't drink enough water frequently develop hypernatremia. A lack of thirst or poor judgment is typically to blame for this. An infant with restricted fluid access or a person with dementia are two examples.

Depending on the degree, there are different symptoms, but thirst, restlessness, and exhaustion are a few.

Additional hydration or intravenous fluids may be prescribed as a kind of treatment.

some of the major Symptoms include

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The process by which plants use light energy to transform water, carbon dioxide, and high-energy carbohydrates like sugars and starches into oxygen is Photosynthesis.

Photosynthesis is the process by which phototrophs transform light energy into chemical energy that is later utilized to power cellular processes. Sugars, made from carbon dioxide and water, are used to store chemical energy.

According to the definition of photosynthesis, photosynthetic pigments like chlorophyll a, chlorophyll b, carotene, and xanthophyll are used exclusively in the chloroplasts. Photosynthesis is a method that all green plants and some other autotrophic organisms use to make nutrients out of carbon dioxide, water, and sunlight. Oxygen is produced as a byproduct of photosynthesis.

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The light-independent processes are started and carbon dioxide is fixed in the first phase of the Calvin cycle.

The Calvin cycle has three main phases. In carbon fixation, CO₂ binds to RuBP and produces two to three carbon molecules of phosphoglycerate. Ribulose bisphosphate carboxylase/oxygenase,  enzyme found in the stroma of chloroplasts, is the one responsible for this reaction. In reduction, 3-PGA molecules produced in carbon fixation are transformed into glucose molecules, which are saccharide molecules. ATP and NADPH generated during the photosynthesis light-dependent processes provide energy for this stage. The regeneration needs ATP. While others are recycled to regenerate the RuBP acceptor, some of the G3P molecules are used to create glucose.

Hence, calvin cycle forms  sugar molecule in photosynthesis.

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Answer: Herbicides can cause malformations by imitating natural plant growth hormones, which can hinder cell division, photosynthesis, or amino acid biosynthesis.

Explanation: Herbicides are substances that are used to control or modify unwelcome vegetation. The most frequent use of herbicides is in row-crop farming, when they are sprayed on either before or during planting to reduce other vegetation and increase crop productivity. They may also be used on crops in the autumn to enhance harvesting.

For example, when plants are treated with a photosynthesis inhibitor, it is expected that the plant will "starve" to death due to a lack of energy. Photosynthesis inhibitors, on the other hand, function too quickly for this to be the case. Photosynthesis inhibitors produce high-energy hazardous chemicals that degrade membranes and cause plant death by inhibiting electron transport.

A herbicide may also cause a harmful chemical to accumulate by suppressing enzyme function. Enzyme activity is generally tightly controlled, ensuring that hazardous chemicals are kept to a minimum. The herbicide causes the material to accumulate by blocking the target enzyme.

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The fundamental ideas of human anatomy and physiology as well as the typical medical phrases pertaining to the body systems are the main topics of Introduction to Medical Terminology.

Each chapter begins with a patient case study that illustrates how medical terminology is used in everyday situations.

The chapter content has been logically divided by medical word components, an introduction of anatomy and physiology, coverage of diseases and conditions, diagnostic techniques, surgical and therapeutic treatments, and medication therapies using a student-friendly approach.

A range of classroom-tested activities are included in each chapter review to help students develop and strengthen their knowledge of medical terminology. Medical illustrators with experience in creating vivid, detailed imagery have accompanied the text.

Purposes of the Urinary System

urinary system organs

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For the hom-ozygous taster, both copies of the gene contain the polymorphism, hence, allowing to be cut by the enzyme. Fragments of 177-bp and 44-bp are then produced.

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In meiosis 1, the number of cells is doubled but the number of chromosomes is not. Meiosis 2, occurs right after meiosis 1, which is more similar to mitosis; the number of chromosomes does not get reduced.

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Three lesions are used to categorize arterial stiffness or arteriosclerosis:

When the intima of the artery wall begins to swell due to the deposition of various kinds and amounts of lipids, inflammatory cells, connective tissues, matrix proteins, enzymes, and calcium deposits, arteriosclerosis lesions form.

Atherosclerosis is the term for these lesions as they develop. Atheroma and arteriosclerosis combine to form atherosclerosis. Thousands of heart attacks and strokes are caused by this, which is the biggest cause of death in developed nations.

The deposition of calcium in the tunica media of the big and medium-sized arteries is known as Moenckeberg medial calcific sclerosis. Patients younger than 50 rarely have it.

In contrast to atherosclerosis, this type of calcification solely affects the artery walls and does not impact the artery lumen. When both the wall and the lumen are damaged, Moenckeberg sclerosis and atherosclerosis may coexist.

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Cell differentiation is most likely regulated by DNA. During the development of an embryo, cell differentiation is very important.

The transformation of a stem cell from one type to a differentiated one is known as cellular differentiation. The cell usually evolves into a more specialized form. The key to the identity of cells, tissues, organs, and organisms is their differentiation during embryogenesis. When an egg is treated by a sperm, a zygote is framed. In a process known as cleavage, the zygote divides into multiple cells, kicking off the beginning of embryonic differentiation.

DNA is a living cell component that plays a significant role in directing cell differentiation. During the process of cell differentiation, genetic information is incorporated into new cells by DNA molecules. Specialized cells were created during the process of cell differentiation.

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The ways that humans can affect coral reefs are :

A)Construction and sedimentation  -Sedimentation is an extremely important cause of coral reef destruction. Coastal construction and shore development often result in heavy sediment loading. Further effects are caused by inadequate land management and deforestation where soil runoff from farms and settlements delivers sediments to the reefs. Watersheds cleared of their forests and other vegetation cover is unsafe for erosion and flooding, resulting in increased levels of sediments reaching the reefs.

B) Mangrove cutting -The destruction of mangroves by clear-cutting or pollution has resounding consequences on coral reef ecosystems. Mangroves give nutrient-rich feeding grounds for many marine species, which if removed would eliminate fishing grounds. Furthermore, mangroves protect the shoreline against cyclones and storms and stabilize it against erosion and land loss.

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Answer:

C. The sample size is too small and may not be representative of mantle

ringwoodite.

The main problem with this evidence is the sample size is too small and may not be representative of mantle ringwoodite. The correct option is C.

Studies that use scientific theory, models, experiments, and physical circumstances are referred to as scientific studies. It could be used to describe: The scientific method, a collection of methods for examining phenomena that are based on empirical or quantifiable evidence and are subject to the rules of logic and reasoning.

RCTs, cohort studies, case-control studies, and qualitative studies are the main categories of research. Papers that describe experimental work are frequently organized chronologically into five sections: introduction, materials and methods, results, discussion, and conclusion. These three sections combined make up the paper's body.

Therefore, the correct option is C. The sample size is too small and may not be representative of mantle ringwoodite.

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In light reaction of photosynthesis electron transport, splitting of water, a hydrogen ion gradient is established to produce ATP. the correct option to this question is D.

Two stages of photosynthesis occur: a light-dependent reaction and a light-independent reaction.

The photosystem's chlorophyll absorbs light energy, which triggers the onset of the light-dependent. The electrons that are given by the chlorophyll molecule are excited as a result of this absorption.

A chain of electron flow known as the electron transport chain is started when an electron acceptor molecule accepts excited electrons from the reaction center.

As a result of this electron transit, the photosystem experiences an electron shortage that leads to the splitting of the water molecule, which releases oxygen gas.

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Complete question: Which of the following occurs during the light-dependent reactions of plants?

a. Electron transport

b. The splitting of water

c. A hydrogen ion gradient is established to produce ATP

d. All the above

The effect is that the galaxy's spiral arms will disappear, and so will our supermassive black hole.

A galaxy is a collection of stars, stellar remains, interstellar gas, dust, and dark matter that are gravitationally bound together. The word comes from the Greek word galaxias, which means "milky" and refers to the Milky Way galaxy, which houses the Solar System. Galaxies were created when enormous clouds of gas and dust collapsed under the force of their own gravitational pull, allowing stars to form.

Our galaxy moves in relation to other galaxies in the universe in addition to the motions of Earth within the solar system and of our solar system within the Milky Way Galaxy. These motions are somewhat random for nearby galaxies. For instance, the Milky Way Galaxy is heading in the direction of the Andromeda Galaxy. On a larger scale, however, researchers have found that the universe as a whole is expanding, which over time is causing all collections of galaxies to drift apart.

In conclusion, the spiral arms of galaxies and our supermassive black hole will vanish.

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