Which of the following prevents blood from flowing backward through the circulatory system?

Smooth muscle in the arteries
Smooth muscle in the veins
Valves in the arteries
Valves in the veins

Mutations are permanent alterations of the DNA sequence that can affect an organism's physical traits, potentially causing diseases like cancer. They can be caused by errors during DNA replication or by environmental factors like chemical mutagens and radiation. Mutations range from point mutations to large chromosomal changes and can be benign, beneficial, or harmful.

A mutation is a permanent alteration in the nucleotide sequence of a genome, which may occur due to various reasons such as damage to DNA, replication errors, or the action of mobile genetic elements. Mutations can lead to changes in an organism's phenotype or observable characteristics, playing a critical role in both normal and abnormal biological processes. This includes contributing to evolution, the emergence of cancer, and the complexities of the immune system.

Among the different types of mutations are point mutations (a change in a single nucleotide), insertions, deletions, and large-scale mutations that alter chromosomal structure. While some mutations are benign or even beneficial, others can be deleterious, leading to diseases like cancer, or even be lethal.

Mutagens, including radiations like X-rays and gamma rays, as well as chemical substances, can cause mutations. Some mutations occur spontaneously and can be passed on to next generations if they occur in germ cells, or remain confined to an individual if they occur in somatic cells.

A neuron can have a consecutive (one right after the next) without a break in between FALSE.

EXPLANATION: Neuronal refractory period The refractory period in a neuron occurs after an action potential and generally lasts one millisecond.

Answer:

How long does a mutation last?

AS Long As The Cell Lives

Explanation:

Answer:

C: As long as the cell lives.  Hope this helps! :D

Explanation:

Answer:

1.) Size, Hair Color

2.)a trait that is not passed down with dominant and recessive alleles from one gene.

Explanation:

the answer to this question is c. the production of offspring involves mitosis

The production of offspring involves meiosis.

The correct answer is D. The production of offspring involves meiosis. Sexual reproduction involves the fusion of two gametes, or sex cells, which are formed through the process of meiosis. Meiosis is a type of cell division that produces cells with half the number of chromosomes as the original cell. This is important because it allows the offspring to have a combination of genes from both parents, making them genetically unique.

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when you start to feel like someone from the different sex

Answer:

variation in the relative frequency of different genotypes in a small population, owing to the chance disappearance of particular genes as individuals die or do not reproduce.

hope this helps

Ozone gas does indeed have a slight blue color. It is dark blue in a liquid form and purple-black in solid form. The color comes from the fact that it absorbs all wavelengths of light other than those in the blue region.

Ozone gas has a pale blue color. It is a bluish gas that is often associated with the upper layers of Earth's atmosphere,.

Option A is correct.

Ozone is a molecule made up of three oxygen atoms. It is a pale blue gas that is odorless and tasteless. Ozone is found in the stratosphere, the layer of Earth's atmosphere that is about 10 to 50 kilometers above the Earth's surface. Ozone absorbs ultraviolet radiation from the sun, which helps to protect life on Earth from the harmful effects of UV radiation.

Ozone is also found in the troposphere, the layer of Earth's atmosphere that is closest to the Earth's surface. However, ozone in the troposphere is harmful to human health. It can cause respiratory problems, such as asthma and bronchitis. It can also damage plants and crops.

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Answer:

A. Tornadoes

Explanation:

Tornado is a climate change that is density independent factor, and will exert influence on the size of population, no matter what is the density of that population. While on the other hand their are density dependent factors, whose effect become intense as the size of that particular population increases e.g. spread of a certain disease in an area will be more where people are living in close proximity.

Answer: A. Tornadoes

Explanation:

Nucleus is NOT found ALL cells.

Common features of cells include the cell membrane, the cytoplasm, and the cytoskeleton. Cells also have ribosomes, which are structures where proteins are made. . Cells are classified as prokaryotes or eukaryotes.

The smallest and simplest cells are prokaryotes. A prokaryotic cell is a cell that lacks a nucleus and other internal compartments. As a group they are also among the most ancient. Fossilized prokaryotic cells have been found in rocks over 3 billion years old. A eukaryote is a cell that has a nucleus and other internal compartments, known as organelles.

Hope this helps!!!!!!!!! ^_^

A feature that is not found in all cells is a nucleus as a nucleus is a membrane-bound organelle that is present in eukaryotic cells but not in prokaryotic cells, and the nucleus acts as the central repository for genetic material.

In eukaryotic cells, the nucleus stores the genetic material and contains the cell's DNA in the form of chromosomes and it also plays an important role in regulating the expression of genes and controlling the cell's growth and division, while prokaryotic cells lack a nucleus and have a more simple structure than eukaryotic cells.

Hence, a feature that is not found in all cells is a nucleus as a nucleus is a membrane-bound organelle that is present in eukaryotic cells but not in prokaryotic cells, and the nucleus acts as the central repository for genetic material.

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The earth’s orbit around the sun is a perihelion. The orbit is also  not a true elliptic circle because the orbit is influenced by other nearby celestial orbits such as the planets in the solar system. On occasion, the orbit is deformed putting a particular part of the earth’s orbit closer to or farther from the sun. Also, the barycentre of the solar system changes as the alignment of the solar system’s celestial bodies varies over time.

Answer

Hi,

Geochemical cycling is the flow of substances or elements that occurs between reservoirs in Earth’s atmosphere, the water bodies and the lithosphere.

Explanation

A geochemical cycle is normally the path followed by chemical elements in the surface and crust of the Earth. The cycle starts with the crystallization of magma in the lithosphere at the surface or at depth. Weathering and surface alteration follows breaking down igneous rock that will be transported and deposited as sediments. The sediments become lithified and later metamorphosed until melting happens to form new magma.

Best wishes!

They specify the order of amino acids in a protein from N-terminus to C-terminus

Each group of three bases in mRNA constitutes a codon, and each codon specifies a particular amino acid (hence, it is a triplet code). The mRNA sequence is thus used as a template to assemble—in order—the chain of amino acids that form a protein.

Sure, based on the image you sent, the best option to make the food chain model more accurate is option C)The sun, a producer, and arrows to show the flow of energy.

* The image shows a bird, a fish, and a shrimp. These are all consumers, meaning they get their energy by eating other organisms.

* A food chain shows the transfer of energy from one organism to another. In this case, the energy would flow from the sun to the producer (which is not shown in the image), then to the fish, and then to the bird.

* Arrows are used to show the direction of the energy flow. So, the model would need arrows to show that the energy flows from the sun to the producer, from the producer to the fish, and from the fish to the bird.

Therefore, the most accurate way to complete the food chain model would be to add the sun as a producer and arrows to show the flow of energy.

Here are some additional details that could be added to the model to make it even more accurate:

* The specific type of producer that the fish eats (e.g., algae, plankton)

* The specific type of fish that the bird eats

* The decomposers, which break down dead organisms and return nutrients to the ecosystem

Therefore, Option C is the correct choice.

DNA is the genetic material responsible for inheritance and is passed from parent to offspring for all life on earth. DNA must be replicated accurately to preserve its integrity. DNA also directs and regulates protein synthesis in a cell.

DNA serves two essential functions that deal with cellular information. First, DNA is the genetic material responsible for inheritance and is passed from parent to offspring for all life on earth. To preserve the integrity of this genetic information, DNA must be replicated with great accuracy, with minimal errors that introduce changes to the DNA sequence. A genome contains the full complement of DNA within a cell and is organized into smaller, discrete units called genes that are arranged on chromosomes and plasmids. The second function of DNA is to direct and regulate the construction of the proteins necessary to a cell for growth and reproduction in a particular cellular environment.

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DNA contains genetic information, but it does not directly translate nitrogenous bases into proteins. Chromosomes carry genetic material and are passed during reproduction.

DNA Contains Genetic Information:

DNA (deoxyribonucleic acid) is a molecule that carries genetic information in all living organisms. It consists of sequences of nucleotides containing adenine (A), thymine (T), cytosine (C), and guanine (G). The order of these nitrogenous bases forms the genetic code.

DNA Does Not Directly Translate Nitrogenous Bases into Proteins:

The process of translating genetic information into proteins occurs through a two-step process: transcription and translation. DNA serves as a template for RNA (ribonucleic acid) during transcription. Nitrogenous bases in RNA (adenine, uracil, cytosine, and guanine) complement those in DNA. The mRNA (messenger RNA) produced during transcription carries the genetic code to the ribosomes, where translation occurs, converting the code into proteins.

DNA Contains Chromosomes Passed During Reproduction:

DNA is organized into structures called chromosomes. Chromosomes carry genes, which are segments of DNA that encode specific traits. During reproduction, chromosomes are passed from parent to offspring. In humans, for example, each parent contributes half of the chromosomes to the offspring, ensuring genetic diversity.

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Answer:

It is D : Ectothermic animals need the warmth from the sun to allow them to move around and hunt for food.

Explanation:

I took the test and it said it was right

Lizards bask in the sun because ectothermic animals need the heat of the sun to move around and hunt for food.

When we talk about ectothermic animals, we are talking about beings that need external sources to maintain their temperature. This means that they need to be exposed to the sun or stay in a warm place, such as rocks. One group of animals that has this characteristic is the reptiles.

From this information, we can conclude that lizards warm in the sun because ectothermic animals need the sun's heat to move around and hunt for food.

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The answer would be D

d

please give branlyist

Answer: D. Gene flow would increase between the two halves, and speciation would not occur

Explanation:

Speciation is a phenomena of evolution of a new species from the existing parent species. This occurs when the population of the species gets separated due to geographical barrier, behavioral and due to temporal isolation (having distinct mating seasons). The members of the separated populations may undergo with genetic variations and mutations which may likely to produce a new species.

According to the given situation, if the split halves rejoined then speciation would not occur because speciation requires time for genetic variations and mutations to occur. As, a result of rejoining of the two halves the gene flow will occur due to inbreeding and speciation would not occur.

Answer:

Atoms used energy to make new molecules through making bonds with one another because bonds allow atoms to attached tightly with each other. The energy come from the external environment in order to produce new molecules. So we can conclude that energy is the main ingredient needed for making new molecules and this energy is gained from the environment.

Explanation:

The energy required to produce new molecules comes from various sources such as sunlight, chemical energy, and thermal energy. In photosynthesis, for example, the energy from sunlight is used to convert carbon dioxide and water into glucose and oxygen.

In cellular respiration, glucose and other organic molecules are broken down to release energy for the production of ATP, the energy currency of the cell.

The energy released during the breakdown of these molecules is then used to fuel various cellular processes including the synthesis of new molecules. In addition, some organisms can derive energy from chemical reactions, such as chemosynthesis, in which inorganic compounds are used to produce organic molecules.

The energy required for the production of new molecules ultimately comes from the conversion of one form of energy to another.

In addition to ATP, energy can also come from other sources such as light, heat, and chemical gradients. For example, in photosynthesis, the energy to produce new organic molecules comes from sunlight, which is captured by pigments such as chlorophyll and used to drive the synthesis of glucose and other sugars.

In chemosynthesis, bacteria use the energy from chemical gradients, such as those created by the oxidation of hydrogen sulfide, to produce new organic molecules.

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Coelom

Animals with 3 issue layers may be characterized by the presence or absence of a Coelom.

Answer: A. When the two populations can no longer interbreed

Explanation:

Speciation is a process in which the members of the same population of a species get separated due to geographical, physical, behavioral, and temporal barriers. The separated members develop new traits and becomes a new species.

Among the given options,  A. When the two populations can no longer interbreed is the correct option because if the members of the same population will longer interbreed they may experience reproductive isolation from the separated members and with the coarse of evolution they will develop traits which will be responsible for the development of new species. Hence, speciation will complete.

Answer:

When two populations can no longer interbreed

Explanation

Here you go buddy.

Answer:

4. c) The cell enters [tex]G_{1}[/tex].

Cytokinesis is the last step in the process of cell division and it begins prior to the end of mitosis, in anaphase. Through this process, the cytoplasm of the dividing cell is split in two, and thus two identical daughter cells are obtained. These cells are diploid and thus contain a full complement of chromosomes.  

5. c) [tex]G_{1}[/tex] --> S --> [tex]G_{2}[/tex] --> mitosis --> cytokinesis.

The cell division process begins with a cell growth period known as interphase.  

During [tex]G_{1}[/tex], the cell increases in mass in preparation for cell division. All cellular contents, excluding the chromosomes, are duplicated. This is followed by the S phase in which the chromosomes are duplicated. This step end in [tex]G_{2}[/tex] during which the cell continues to increase in mass and synthesize proteins. Here, the duplicated chromosomes are also checked for errors and repaired if necessary.  

During mitosis, the chromosomes in the nucleus are divided into two new nuclei through the mitotic spindle. The cytokinesis is the last step in which the cytoplasm is divided evenly into two new daughter cells.  

6. a) DNA replication

During synthesis, the DNA contained within the chromosomes is replicated. This will result in a complete copy of the genetic material. This stage is preceded by the [tex]G_{1}[/tex] phase and followed by the [tex]G_{2}[/tex] phase. These three phases composed the cell growth period known as the interphase.

7. d) interphase

The interphase is a period in which the cell grows in mass ([tex]G_{1}[/tex] and [tex]G_{2}[/tex] phases) as well as a replication of the genetic material (S phase). This will result in a larger cell that will contain a copy of all the structures and genetic material found before the interphase.  

8. d) DNA copying: synthesis phase

[tex]G_{1}[/tex] is the first phase in the process known as interphase. It is characterized by a duplication off all cellular structures with the exception of DNA. The DNA is copied during the synthesis phase, which starts at the end of [tex]G_{1}[/tex]. This DNA will be checked for errors and repaired during the [tex]G_{2}[/tex] phase.  

9. b) [tex]G_{2}[/tex]:S

During prophase, the chromosomes inside the cell’s nucleus condense in tight structures. These are then arranged in a line along the equator of the cell during metaphase. The DNA contained within the nucleus is duplicated in the S phase and then are checked for errors during [tex]G_{2}[/tex].  

10. c) The nucleus is divided into two nuclei

The genetic material that has been duplicated during the S stage of the interphase, will need to be divided so that two identical daughter cells may result. This occurs during the stage of cell division known as mitosis. The end result will be two nuclei that will belong one to each daughter cell.  

11. b) Metaphase

Metaphase is the third of five step that compose the cellular division process known as mitosis. During this stage, the duplicated chromosomes in the S stage of interphase are arranged in a line along the equator of the cell. These in turn will be divided and thus for two new nuclei from that of the original cell.

Function in Ribosomes in cells is structure that makes portein.

Ribosomes are critical for protein synthesis in cells, comprising rRNA and proteins to translate genetic information from mRNA into amino acids to form proteins. These structures are abundant in cells with high protein production, such as pancreatic cells, and are found in both eukaryotic and prokaryotic cells.

The function of ribosomes in cells is crucial as they are the cellular structures tasked with protein synthesis. Ribosomes are composed of ribosomal RNA (rRNA) and proteins, forming two distinct components: a large and a small subunit. They bind to messenger RNA (mRNA) and translate the genetic code into the specific sequence of amino acids that will form proteins. These proteins play vital roles in the cell, acting as enzymes, hormones, antibodies, structural components, and more. Ribosomes can be found either floating freely in the cytoplasm or attached to the cytoplasmic side of the endoplasmic reticulum (ER), where they are involved in synthesizing proteins destined for the Golgi apparatus or secretion.

Ribosomes are particularly abundant in cells that create large amounts of protein, such as those in the pancreas, which produces digestive enzymes. Moreover, the presence of ribosomes is universal in both eukaryotic and prokaryotic cells, although their size and structure may vary. The abundance and strategic location of ribosomes in cells exemplify the concept that form follows function in biological systems.

1. Algae

producer

2. Deer

herbivore

3. hawk

carnivore

4. human

omnivore (honestly a really broad statement but overall yes most humans are omnivores c:)

5. vulture

scavenger

6. mushroom

decomposer

hope this helps! :)

Answer:

1. Algae  (Producer ) [Because all algae species are autotrophs]

2. Deer (Herbivore) [Because deer eat vegetation]

3. Hawk  (Carnivore ) [They eat flesh]

4. Human  (Omnivore ) [Eat everything including greens and flesh]

5. Vulture  (Scavenger) [Feeds on dead remains]

6. Mushroom (Decomposer) [Degrades organic matter in soil]

Your answer would be; Energy can be changed from one form to another, but it cannot be created or destroyed.

2. Energy can neither be created nor destroyed, but it can change from one form to another

The kind of erosion that involves dissolved particles is CALLED CHEMICAL EROSION.

Erosion refers to the action of surface processes which removes soils, rocks or dissolved materials from one point on the earth surface and transport it to another site.

Chemical erosion is the process by which a rock or other geological features are broken down as result of chemical process. Chemical erosion is also known as chemical weathering.  The process of chemical erosion is brought about by water which react with mineral grains in rocks and soils to form new mineral grains and soluble salts. This is especially true for acidic water. Examples of chemical erosion are carbonation, hydrolysis, hydration and oxidation.

Answer:

B

Explanation:

While we may have many species on earth, they all share a common ancestor known as the cenancestor. Even when comparing the genomes of many different species on earth, these are a number of genes (approximately 300) that have been conserved throughout these species some of these being associated with cellular respiration and central dogma.

Answer: Option B

Explanation:

There are many different types of organism that is related to each other. Some of the organisms have been evolved from other organisms.

Two organism are said to be similar because the organism are closely related to each other. They have more recent common ancestors.

The characters in the organism are similar because they are related to each other by their ancestry.

Yes

The given statement is true

Answer:

False

Explanation:

The corals are the marine invertebrates which live together in the oceans attached to the substratum forming a colony called the polyp.

The coral food chain becomes complex and forms food web and the position of the corals in the food web is the primary consumers as they feed on the zooplanktons through tentacles to survive.

Since the producers are the organisms which produce food on their own or are autotrophic like phytoplanktons but the corals feed on these planktons, therefore, are considered the primary consumers.

Thus, False is the correct answer.

206 bones are in the body

The adult human skeleton consists of 206 bones, although this number was around 270 at birth, the bones fuse together over time forming 206 bones.

Polar air masses, which can be either cold and dry continental polar (cP) or cold and moist maritime polar (mP), form at the poles and move toward the equator. The correct answer is A. Polar.

The type of air masses that form at the poles and move toward the equator are known as polar air masses. These are further subdivided into continental polar (cP) and maritime polar (mP) air masses. Continental polar air masses are cold and dry, forming over the landmasses in the polar regions, while maritime polar air masses form over the cold oceans and are cold but carry more moisture. The correct answer to the student's question is A. Polar.

Answer:

An echinoderm is a marine invertebrate. Starfish, Sea urchin, and Sand dollars are all echinoderms. A spider is an arachnid. Which means a spider is *NOT* an echinoderm.

Answer: D) Spider

Hope this helps. :-)

Answer:

D)spider​

Explanation:

Starfish, Sea urchin, and Sand dollar, all of following are echinoderms. A spider is a an arachnid.