PLZ HELP 7TH GRADE SCIENCE

Answer: All living organisms share several key characteristics or functions: order, sensitivity or response to the environment, reproduction, growth and development, regulation, homeostasis, and energy processing.

A mutation that occurs in a region of the DNA that codes for an amino acid sequence found in the active site of an enzyme can change the folded morphology of the active site and its affinity for its substrate.

Large regions of DNA can replicate when there is a mutation, usually as a result of genetic recombination. Animal genomes duplicate tens to hundreds of genes per million years, creating a significant genetic resource for the generation of new genes. The bulk of genes can be classified into bigger gene families that share an ancestor using sequence homology. The procedures that most typically result in novel genes are the duplication and mutation of an ancestral gene or the recombination of segments from several genes to create new combinations with novel functions. When connected, protein domains work as modules, each with a distinct purpose, to create genes that code for new proteins with unusual features.

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Answer:

Hi, I'm going to say A since The DNA supercoils itself with the help of various proteins to get a compressed shape so that it can fit and be packaged inside the nucleus of the cell.

Please correct me if I am wrong :)

Have a nice day

Explanation:

Answer:

its B

Explanation:

I took the Quiz

Over 90% of population growth occurs in rural areas.

The term "population" refers to all citizens who are either permanently residing in a country or who are just passing through. This indicator reveals how many people typically reside in a certain area.

Growth rates are the population changes that occur each year as a result of births, deaths, and net migration.

The total population also includes national military forces deployed overseas, merchant mariners at sea, diplomatic staff based abroad, civilian foreign nationals residing in the nation, and internally displaced people residing in the nation.

Therefore, Over 90% of population growth occurs in rural areas.

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Answer:

neural tube defect

Explanation:

Answer:

B. Recessive

Explanation:

Albinism is developed in an autosomal recessive pattern

Answer:During sexual reproduction, two haploid cells, called gametes, fuse to form a diploid cell called a zygote. In animals, the gametes are sperm and eggs, and the process by which they fuse is called fertilization. In plants, the gametes are produced by the male and female reproductive cells, called the microgametes and the megagametes, respectively, and the process is called syngamy.

During fertilization in animals, the sperm penetrates the egg, and the nuclei of the sperm and egg fuse, combining their genetic material. This forms the diploid zygote, which then undergoes cell division to form a multicellular organism.

In plants, the fusion of the microgametes and megagametes occurs at the tip of the pollen tube and the egg cell. This process is called double fertilization, which leads to the formation of a diploid zygote and a triploid cell called the endosperm, which provides nourishment for the developing seed.

In both case, sperm and egg or micro and mega gametes are the structure fusing to form diploid zygote during sexual reproduction.

Answer:

A.Because the cell starts with a diploid number of chromsomes and ends up as haploid

Bacteria can be classified on the basis of some of their main features which include their shape, mode of nutrition, mode of respiration and composition of their cell wall.

Bacteria are single-celled organisms which are able to survive in a wide range of conditions are found almost everywhere in the environment. They can be classified on the basis of some of their main features. The first feature is shape. Bacteria in nature can be found in different shapes which include rod-shaped, sphere, spiral etc. Another feature is their mode of nutrition which can be either heterotrophic or autotrophic.

The third feature can be their mode of respiration which can be either anaerobic or aerobic. Another feature is the composition of cell wall. The cell wall can be either peptidoglycan or lipopolysaccharide cell wall.

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Due of the larger range in the blue population's largest tower's height than in the yellow population.

They don't have to worry about the planet providing for them because they have a stable climate, which allows them to have children virtually all year round, and human-provided resources. Your traits, which are features or characteristics that you inherit from your parents, are determined by the information carried by your genes (say: trates). In the human body, each cell has between 25,000 and 35,000 genes. A common garden experiment reveals that individuals in the UCSD population had shorter wings and tails than those in the adjacent mountains, and the physical variations are genetically based.

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To get maximum power from a given voltage, the amount of current and voltage needed to juggle in a circuit. So, the correct option is (D).

Voltage is also called electric pressure, electric tension or potential difference which can be defined as the difference in electric potential between two points. In a static electric field, it describes the work required per unit charge to move a test charge between two points.

To maintain a certain amount of current passing through a circuit the voltage of a circuit is changed which is directly proportional to the current. Lowering the voltage will reduce the flow of current, when we assume that the resistance of the circuit remains the same depending on the demand the voltage changes and the current automatically changes.

Thus, to get maximum power from a given voltage, the amount of current and voltage needed to juggle in a circuit. So, the correct option is (D).

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Turner syndrome (XO) in women have to give up end result from non-disjunction for the duration of Meiosis II.

Meiosis II withinside the mother, wherein she may be capable of produce 50% eggs having 2X chromosomes at the same time as the rest 50% will now now not have any X chromosome. When the latter type (O) of eggs fuse with the X chromosome containing sperms paperwork the father, it will be a XO genotype female with Turners syndrome Another possibility is non-disjunction for the duration of Meiosis II withinside the father. In meiosis II, the sister chromatids separate, making haploid cells with non-duplicated chromosomes. There are divisions in meiosis; the primary department is meiosis I: the quantity of cells is doubled however the quantity of chromosomes is not. This consequences in half of of as many chromosomes in line with cell. The 2d department is meiosis II: this department is like mitosis; the quantity of chromosomes does not get reduced.

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The insertion or deletion of nucleotide bases in amounts that are not multiples of three is referred to as a frameshift mutation in a gene.

This is significant because a cell reads the genetic code for proteins in groups of three nucleotides.

These so-called "triplet codons" each stand for one of the 20 different amino acids that go into making a protein.

The entire gene sequence after the mutation will be misread if a mutation alters this regular reading frame. This may lead to the incorrect amino acids being added to the protein or the development of a codon that prevents the protein from getting longer.

Therefore, The insertion or deletion of nucleotide bases in amounts that are not multiples of three is referred to as a frameshift mutation in a gene.

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Answer:

D

Explanation:

Answer:

help with what ? theres nothing there

Answer:

D. Carbon and three oxygen atoms

Explanation:

All carbonate minerals contain one carbon atom bonded to three oxygen atoms.

The correct option is A. All carbonate minerals contain the elements

carbon, oxygen, and also one or more metal elements.

The carbonate ion (CO32-) consists of one carbon atom and three oxygen atoms, and it is this ion that forms the basis of all carbonate minerals.

When carbon dioxide (CO2) dissolves in water, it forms carbonic acid (H2CO3), which can then react with minerals that contain metal ions, forming carbonate minerals. Examples of carbonate minerals include calcite, dolomite, and aragonite.

The most common carbonate mineral is calcite, which is a polymorph of the mineral calcium carbonate (CaCO3). Other carbonate minerals include aragonite, dolomite, magnesite, and siderite.

These minerals are important economically because they are used as building materials, as sources of metals such as magnesium and iron, and in a wide range of industrial applications.

Carbonate minerals are also important in the geological record because they can provide information about the environmental conditions in which they formed.

For example, the isotopic composition of carbon and oxygen in carbonate minerals can be used to determine the temperature and salinity of the water in which they formed. Carbonate minerals can also be used to study the history of Earth's climate, as changes in the amount of carbon dioxide in the atmosphere are reflected in the isotopic composition of carbonate minerals in sedimentary rocks.

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The gene affected by this condition is known as the KCNH2 gene. This gene is located on the long arm of chromosome 7 and encodes a voltage-gated potassium channel.

The voltage-gated potassium channel is an integral membrane protein that is responsible for controlling the flow of potassium ions into and out of cells.

The KCNH2 gene is important for the normal functioning of cells in the body. It is essential for the maintenance of the resting membrane potential by regulating the flow of potassium ions. It is also involved in mediating the electrical activity of the heart and plays a critical role in cardiac repolarization. Mutations in the KCNH2 gene can lead to a variety of cardiac arrhythmias and other cardiac conditions, including long QT syndrome.

Long QT syndrome is a genetic disorder that affects the electrical activity of the heart and can cause syncope, cardiac arrest, and even sudden death. The KCNH2 gene is one of the genes that has been linked to this disorder. Mutations in this gene affect the normal functioning of the voltage-gated potassium channel, which can lead to a prolonged QT interval on an electrocardiogram (ECG). This can result in an increased risk of life-threatening arrhythmias and cardiac arrest.

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The role of mucus and cilia in the respiratory tract is to block foreign particles from entering the nose.

The respiratory tract consists of the nasal cavities, pharynx, larynx, trachea, bronchi, bronchioles, alveoli and lungs. The nasal cavity in the respiratory system has a function to continue the incoming air then leads to the throat.

In the nasal cavity there is a mucous membrane which is the receipt of the mucous membrane and cilia of the nose hair which is very fine. Mucus is made of mucin and water which forms a sticky gel whose role is to trap bacteria, viruses, dirt and dust from outside so it doesn't enter the nose. While the cilia play a role in filtering air through their fine hairs which will prevent dirt from entering the nose.

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The correct answer would be inner planets, Terrestrial planets is another name for the inner planets.

There are a total of eight planets in our solar system. The outer planets and the inner planets are two other major groups into which planets can be divided. Earth, Mercury, and Mars are considered inner planets since they are situated within the asteroid belt (region of asteroids between Mars and Jupiter). Furthermore, because they are made of minerals and metals, inner planets differ from other planets in terms of their composition. These planets are also referred to as terrestrial planets because of their makeup.

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The growth of the algae came from the air and water in the bottle. A typical summertime annoyance is the proliferation of algae. These little creatures enjoy attaching to cracks in used returnable bottles. Algae can grow rapidly in a bottle of water because of the sunlight and warmer temperatures.

The organisms are quite tough, even after the bottles have gone through the water cycle. The algae can then receive sunlight as a result. Clear plastic and glass containers are both suitable options. You may use something smaller, like a plastic water bottle, or something bigger, like a tiny aquarium, to cultivate algae for a science air project. Algae can also grow in environments that are highly wet but are not aquatic. For instance, the rocks next to a creek or river might be sufficiently moist to support a thick layer of algae.

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Answer:

C. natural selection

Explanation:

I hope this helped :)

Answer:

C

Explanation:

A cell uses a variety of procedures to turn carbohydrates into energy. The initial and most fundamental one is known as glycolysis. Hexose sugars are used to fuel it. This lengthy procedure only expels a modest quantity of energy.

The energy needed by your body to function comes from glucose. The body receives glucose from the consumption of carbs. You get four calories of energy from every gramme of carbohydrates you eat. When you consume carbs, your digestive system uses specialised enzymes to convert them into glucose, a type of simple sugar.

Function of sugar in the body The body uses carbohydrates as fuel to produce energy.

Foods high in carbs are converted by the body into glucose, which can then travel through the bloodstream. For the brain, central nervous system, and red blood cells to operate properly, some glucose is required.

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Answer:

No.

Explanation:

There is no clear evidence which indicates that cell phones will cause cancer because they emit very low intensity of radio waves but it can cause other diseases. Diseases such as brain tumor, male infertility and ear hearing function can be adversely affected by using cell phones due to the radio wave they emit. So we can say that cell phones will not the cause of cancer disease.

Answer:

No, the increasing number of cell phones will not the cause of cancer because it emits low intensity of radio waves. Radiations such as x-rays, gamma rays, alpha particles, beta particles, and neutrons are responsible for causing damage to the cell and the main cause of cancer. High intensity of radio waves heats up the cells not causing cancer disease so we can conclude that the increasing number of cell phones will not cause cancer disease in humans.

Explanation:

esto da como resultado una tasa de transpiracion y una disminucion de de transpiracion por depocito de capa de lipidos en la superficie de las hojas en exposicion a sequia moderada

Pest species.

Nuisance species.

Weeds (In reference to plants)

Harmful non-native species.