Which phase of the cell cycle occurs first?
The ecological approach emerged as a reaction _____.
what kind of characteristics do star fish have?
Sea stars have thick arms containing organs, use tube feet for movement and feeding, and possess two stomachs for digestion. They belong to the class Asteroidea and exhibit radial symmetry. Over 1,800 species of sea stars exist in various shapes and colors.
Characteristics of Starfish
Starfish, also known as sea stars, are fascinating marine animals belonging to the class Asteroidea. They exhibit several unique characteristics:
Thick Arms: Sea stars have thick arms that extend from a central disk. These arms, also called ambulacra, contain organs that penetrate into them.Tube Feet: Their tube feet are used for gripping surfaces and grasping prey. Tube feet are essential for their locomotion and feeding.Digestive System: Sea stars have two stomachs. One of these can be everted through their mouths to secrete digestive juices onto prey, essentially liquefying it for easier digestion.Sea stars come in a variety of shapes, colors, and sizes, with over 1,800 species known to date. They mainly feed on mollusks and exhibit radial symmetry with their body parts arranged around a central axis.
How many total pairs of the highlighted muscle does each individual have?
What is the difference between the nucleotides used in dna replication during the pcr and the nucleotides used during dna duplication within the cell?
Consuming more than 60 grams of fiber per day poses some health risks, such as ________. decreased mineral absorption due to chemical binding by the fiber blockage of the intestinal tract decreased appetite in some individuals all of these choices are accurate.
Final answer:
Health risks associated with consuming more than 60 grams of fiber per day include decreased mineral absorption, blockage of the intestinal tract, and decreased appetite. All of these options are correct, highlighting the need for balanced fiber intake.
Explanation:
Consuming more than 60 grams of fiber per day poses some health risks, such as decreased mineral absorption due to chemical binding by the fiber, blockage of the intestinal tract, and decreased appetite in some individuals. Indeed, all of these choices are accurate. While dietary fiber is beneficial and necessary for proper digestive health, excessive intake can lead to these adverse effects. High levels of fiber can interfere with the absorption of minerals like calcium, iron, and zinc because it binds to these minerals, making them less available to the body. A very high-fiber diet can also lead to intestinal blockages, especially if fluid intake is not increased concurrently. Moreover, fiber is known for its satiating effect, which can be advantageous for weight control but might lead to a decreased appetite and potential undernutrition if intake is excessively high.
The process in which plants convert light energy from the sun into food
This marine ecosystem is the most diverse of all the marine ecosystems. At least one quarter of all ocean species depend on it for food and shelter.
Question 1 options:
kelp forest
coastal estuary
coral reef
bathypelagic zone
four functions of proteins
Explain the difference between a theory and a law.
A law is defined as a description or a statement given after an observed phenomenon. A theory is a simplification of certain observational data as to how and why it happened.
Further Explanation:
Many people believe that when certain evidence supports a hypothesis, it is upgraded into a theory whereas when theory is proved to be correct, it is reformed into a law. But this is a misconception. The theories, laws, or hypotheses are all separate or different parts of a scientific procedure. They might evolve but do not get upgraded into one another.
A mathematical description of a phenomenon is termed as law. A law describes observable data and not how and why it occurred. For example, Mendel’s Law of Independent Assortment. According to this law, the two genes governing two different traits are independent of each other and would express independently in different offspring. It gives a generalized statement according to the observations recorded and explains on what basis the observations are framed. Law is a universal fact that can never be denied with the passage of time.
The theory provides the most possible logical explanation about how and why the certain characteristic has been observed. It might explain how dominant and recessive genes play a role in determining the red hair color of a child of parents with brown hair. For example, Mendel’s laws were explained only after the discovery of chromosomes and DNA. The theory of chromosomal inheritance explains the outcome of the Law of Independent Assortment. This implies that the theory provides a generalized reason behind every law. A theory may be regarded as strong if it is supported by a large number of evidence whereas a weak theory is the one with the least accuracy in its prediction. A theory might become out-dated over a period of time and might be replaced by another theory with better evidence.
Learn More:
1. Learn more about meiosis https://brainly.com/question/1600165
2. Learn more about the process of molecular diffusion in a cell https://brainly.com/question/1600165
3. Learn more about human sperm and egg cell https://brainly.com/question/1626319
Answer Details:
Grade: High School
Chapter: Theory vs Law
Subject: Biology
Keywords:
Theory, explanation, evidence, law, description, observational data, universal, hypothesis.
Answer:
The law is the mathematical explanation of a natural phenomenon while a theory can be the best possible explanation of a natural phenomenon.
Explanation:
The law is:
The mathematical explanation of a natural phenomenon.Law is accepted by all scientists.Law is a certain truth and never replaced.Example: Law of motion, Law of independent assortment.The theory is:
The best possible explanation of a natural phenomenon. There can be many theories for the same phenomenon.Theory can be replaced with a better one.Example: Theory of relativity, Germ theory of disease.On the basis of the above explanation, we can conclude that the law is the mathematical explanation of a natural phenomenon while a theory can be the best possible explanation of a natural phenomenon.
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Four laws or principles are involved with the study of stratigraphy. They are _____.
Four laws or principles are involved in the study of stratigraphy are:
1. Principle of original horizontality
2. Law of superposition
3. Law of crosscutting relationships
4. Principle of Lateral Continuity
Answer:
law of original horizontality, law of superposition, law of original lateral continuity and law of cross-cutting relationships.
Explanation:
Before we know the principles of Stratigraphy, we need to understand what it is. To do this, let's first look at the origin of the word statigraphy: from Latin stratum means layer and from Greek graphia means field of study. From this we can understand that stratigraphy is the study of layers. Therefore, we define stratigraphy as the study of the sedimentary rock layers and it seeks to determine the processes and events that formed them.
Now that we know what Stratigraphy is, let's know its principles:
Law of superposition: In any succession of strata of rock (which has not been deformed), the oldest stratum is positioned lower, with the successively younger strata being positioned higher. This principle allows us to identify the order of formation of the strata, which is the basis of all historical interpretation of stratigraphic rocks. law of original horizontality: Sedimentary deposits usually accumulate in horizontal layers under the influence of gravity. law of original lateral continuity: Sedimentary layers are continuous, extending to the margins of the deposition basin, or tapering laterallylaw of cross-cutting relationships: states that an intrusive or faulty rock that cuts a sequence of rocks is younger than the rocks it cuts.Which of these describes the Gulf Stream ? A. A coral reef in the Pacific Ocean B. A sea floor trench in the Atlantic Ocean C. A strong current of warm water D. An upwelling of water at the poles
Answer: C. A strong current of warm water
Explanation:
A gulf stream can be defined as oceanic current which brings warm water from Gulf of Mexico to the Atlantic ocean. This water current brings changes in the climatic conditions of the east coast of Florida, causing the temperatures warmer in winters and cooler in summers. The gulf stream also reaches some parts of European waters, this makes the atmosphere of the European countries warm.
Is a red fox a vertebrate or invertebrate?
Two major differences in the morphology of spermatids and spermatozoa
The correct answer is that spermatids are larger and have a round shape, while spermatozoa are smaller and have a flagellum.
To understand the differences between spermatids and spermatozoa, one must consider their stages in spermatogenesis, the process by which sperm are produced.
Spermatids are the haploid cells that result from the second meiotic division of secondary spermatocytes. They are characterized by the following morphological features:
1. Size: Spermatids are larger than spermatozoa. This is because they have not yet undergone the final stages of differentiation and maturation that will transform them into mature sperm cells.
2. Shape: Spermatids have a round shape. They do not possess the elongated form that is typical of mature spermatozoa.
3. Nucleus: The nucleus of a spermatid is larger and less condensed compared to that of a spermatozoon. The DNA within the nucleus of a spermatid is not yet fully packaged with protamines, which are proteins that replace histones during spermiogenesis, leading to a more compact nucleus in the spermatozoon.
4. Cytoplasm: Spermatids have a significant amount of cytoplasm, which contains organelles and other cellular components necessary for their development into spermatozoa.
Spermatozoa, on the other hand, are the mature, motile sperm cells. They exhibit the following morphological characteristics:
1. Size: Spermatozoa are smaller than spermatids due to the loss of excess cytoplasm and the condensation of their nucleus.
2. Shape: Spermatozoa have an elongated shape with a distinctive head, midpiece, and tail. The head contains the condensed nucleus, the midpiece has mitochondria arranged in a helical fashion to provide energy for movement, and the tail is a flagellum that propels the sperm.
3. Flagellum: One of the most notable features of spermatozoa is the presence of a flagellum, which is an elongated structure that enables them to swim. Spermatids do not have a flagellum.
4. Acrosome: Spermatozoa have a specialized structure called the acrosome at the tip of their head. The acrosome contains enzymes that help the sperm penetrate the egg during fertilization. Spermatids begin to develop an acrosome, but it is not fully formed until the spermatozoon stage.
In summary, the two major differences in the morphology of spermatids and spermatozoa are that spermatids are larger and have a round shape, while spermatozoa are smaller, have an elongated shape with a distinct head, midpiece, and tail, and possess a flagellum for motility. These differences are crucial for the function of spermatozoa in fertilization.
Where is mt.st. Helens locates
Mt. St. Helens is located in Skamania County, Washington (State) in the US.
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Amino acids that cannot be synthesized by the body are classified as ___ amino acids
Final answer:
Amino acids that the body cannot synthesize on its own are known as essential amino acids. There are nine essential amino acids that must be consumed through the diet as the body cannot make them in adequate amounts. These include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
Explanation:
Amino acids that cannot be synthesized by the body are classified as essential amino acids. There are 20 amino acids used by the body to synthesize proteins, but only nine of these are classified as essential because the body cannot produce them in sufficient quantities. These amino acids must be obtained through your diet. The nine essential amino acids include: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine.
Non-essential amino acids, on the other hand, are those that the body can synthesize on its own and therefore do not need to be ingested. Knowing which amino acids are essential is important as it guides dietary choices to ensure proper nutrition and body function.
Humans and other animals need a variety of materials in order to form the molecular building blocks of life. what is the primary source of these materials?
what does trophic level mean in ecosystem
A patient weighs 154 pounds. she must receive medication in the amount of 25 mg/kg/day. how many milligrams of medication should she take each day? remember that 1 kilogram = 2.2 pounds.
What macromolecule makes up a chromosome?
Alex's family raises fruit and vegetables for income. they live in an area that receives less than .2 inches of rain per month. therefore they need to use an irrigation system to water their crops. where does alex live?
Which organelle performs cellular respiration and turns glucose?
In a cell, the mitochondrion is the organelle that performs cellular respiration, turning glucose into ATP, the energy currency of the cell. This process involves multiple steps, all occurring within the mitochondrion.
Explanation:The organelle that performs cellular respiration and turns glucose into ATP (adenosine triphosphate), which provides energy for cell functions, is the mitochondrion. Glucose is broken down in the process of cellular respiration within the mitochondria to produce ATP. This process involves several steps: glycolysis, the Krebs cycle, and the electron transport chain. Each of these steps occurs within the mitochondrion and contributes to the conversion of glucose into usable energy for the cell.
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The patient is a 10-month-old boy who fell while trying to walk. he cut the bottom of his lip open. sutures are necessary, but due to the patient's age and excessive movement, general anesthesia is needed. what modifier should be used?
A dichotomous key starts with _____ information and leads to _____ information. A) specific, general B) general, specific C) known, unknown D) major, minor
Final answer:
The correct answer to the question is B) general, specific, as a dichotomous key starts with general information and narrows down to specific information.
Explanation:
A dichotomous key is a tool used to organize information for easier identification and it typically moves from more general to specific information. Therefore, the correct answer to the question 'A dichotomous key starts with _____ information and leads to _____ information' is B) general, specific. A dichotomous key is made of a sequence of questions with two possible mutually exclusive answers that help the observer classify organisms or items not previously known to them. By providing two contrasting choices at each step, the decision-making process is simplified, eventually resulting in the specific identification of an organism or item.
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Use the table below to answer the following question.
A group of students analyzed four biological samples that each contained a different macromolecule. The table shows the results of their analysis. Based on this data, which sample most likely contained RNA?
Question 3 options:
Sample 2
Sample 4
Sample 3
Sample 1
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Question 4 (2 points) Question 4 Unsaved
The transmission of genetic material from one generation to the next is necessary for the survival of a species. Which statement describes one property that helps to ensure the reliable transmission of genetic information in living organisms?
Question 4 options:
RNA uses a nucleotide base called uracil to distinguish itself from DNA.
A pyrimidine base will only pair with the correct purine base.
The two strands of a DNA molecule cannot be separated.
Translation of mRNA to assemble a protein is an irreversible process.
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1. A group of students analyzed four biological samples that each contain a different macromolecule.
Here the data is given in the table, based on that we can say that sample 3 is most likely to contain RNA.
Each macromolecule has a different structure and composition other than C, H and O being common.RNA and DNA both are nucleic acid - a macromolecule that is composed of a pentose sugar, phosphate group and nitrogen base(purine and pyrimidines).That can be seen in table number 3- C, H, O, N, sugar, phosphate chain.2.The transmission of genetic material from one generation to next is necessary for the survival of species.
one property that ensures a reliable transmission of genetic information is complementary base pairing.That is a pyrimidine base will only pair with the correct purine base and the then only the DNA replication occurs efficiently.This leads to transmission of genetic information.To learn more about macromolecules :
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The skin (integument) is divided into two general layers. a third layer called the hypodermis or subcutaneous layer is not considered part of the integument but is often included in the description of the skin.
a. name the two layers of the skin from superficial to deep.
b. in which layer are blood vessels and nerves found?
c. what is the main type of epithelium found in the most superficial layer? what is the function of this layer?
Which is an autonomic body function? squinting in the sunlight salivating at the thought of a hamburger raising your hand in class bending over to pick up a book you dropped
Answer:
salivating at the thought of a hamburger
Explanation:
The autonomic functions of the human body are governed by the autonomic nervous system, which is an involuntary system that transmits nerve impulses from the central nervous system to the periphery, stimulating peripheral organs and systems.
Salivating at the idea of a hamburger is an unconscious action, that is, we cannot control it; such as the heartbeat, breathing, among other actions of our human body.
What is meant when it is said that the products of respiration are the raw materials for photosynthesis?
When homologous chromosomes are aligned with each other and arranged as pairs in order of decreasing size, the resulting portrait is referred to as a(n)?
Name the organelles that are only found in the plant cell but not in the animal cell.