PLEASE HELP ASAP!!!
1. Which of the following statements regarding science and technology is true? *
a) Scientific experiments are always aimed at meeting a human need.
b) Scientific inquiry is concerned with cost-effectiveness.
c) Science aims to answer questions whereas technology aims to solve problems.
c) Technology explains and predicts the physical, living and designed world.
2. Kolby wants to grow the tallest sunflowers. She would like to compare two plant foods on her sunflowers to see if either one will make her sunflowers grow taller. Kolby designs an experiment. She has three of the same type of sunflower plant. They all get the same amount of sun and water, and they are kept at the same temperature in the same type of soil. Kolby adds plant food A to plant A, plant food B to plant B, and no plant food to plant C. She measures the growth of the plants every week. *
Height measurements taken weekly during her experiment would be an example of
a) inferences.
b) qualitative data.
c) quantitative data.
d) background information.
3. __________ are a special class of proteins that help speed up chemical reactions inside living things.
a) Polypeptides
b) Amino acids
c) Polysaccharides
d) Enzymes
4. Which of the following is NOT one of the statements of the Cell Theory?
a) All living things are made of cells.
b) Cells are the building blocks of life.
c) All cells have a nucleus.
d) All cells come from existing cells
5. Which group of organisms does NOT have eukaryotic cells? *
a) Protists
b) Animals
c) Bacteria
d) Fungi
6. The main difference between active and passive transport is
a) active transport requires ATP to move substances across the nuclear membrane.
b) passive transport requires ATP to move substances across the nuclear membrane.
c) active transport requires ATP to move substances across the cell membrane.
d) passive transport requires ATP to move substances across the cell membrane.
7. The power of ATP is released when *
a) it is oxidized.
b) an oxygen group is lost.
c) a phosphate group is added.
d) a phosphate group is lost.
8. To maintain equilibrium, cells must be in a(n) _________ solution. *
a) hypertonic
c) hypotonic
c) isotonic
d) pure water
What is the fatty tissue that covers axons and speeds up impulses as they travel from cell to cell?
The fatty tissue is called the Myelin sheath. The myelin sheath is a significantly extended and altered plasma membrane wrapped about the nerve axon in a spiral form. The myelin membranes somes from and are a part of the Schwann cells in the peripheral nervous system and the oligodendroglial cells in the central nervous system. Each myelin-spawning cell delivers myelin for only one segment of any given axon. The intermittent interruptions where short portions of the axon are left uncovered by myelin are the nodes of Ranvier, and they are critical to the functioning of myelin.
The myelin sheath, a fatty tissue produced by glial cells, covers axons and enhances the speed of impulses traveling between cells. The structure includes unmyelinated gaps or nodes of Ranvier, which promote rapid signal propagation. Damage to the myelin sheath can impair signal transmission and cause neurological disorders.
Explanation:The fatty tissue that covers axons and speeds up impulses as they travel from cell to cell is called the myelin sheath. This lipid-rich layer of insulation is formed by glial cells, specifically oligodendrocytes in the Central Nervous System (CNS) and Schwann cells in the Peripheral Nervous System (PNS). The role of this critical structure is to facilitate the transmission of electrical signals along the axon, thereby accelerating neural communication.
Part of how the myelin sheath improves signal speed is through its unique structure, which includes unmyelinated gaps known as nodes of Ranvier. These gaps allow for the quick rejuvenation and propagation of the electrical signal, a process known as 'saltatory conduction'. This arrangement ensures that the axon transmits nerve impulses faster, with less energy consumption, and is better protected from signal interference or 'cross talk' than an unmyelinated one.
The myelin sheath hence plays a crucial role in the proper functioning of the nervous system. Damage or degeneration of this insulation can impair signal transmission and can lead to neurological disorders.
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Newton's _________ Law of Motion states that "The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object." Question 2 options: First or Fourth or Third or Second
Answer:
Second Law
Explanation:
Newton's second law states that acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated) the greater the amount of force needed (to accelerate the object). The second law gives us an exact relationship between force, mass, and acceleration.
Force = Mass × Acceleration
1st law - tells us that acceleration and force are related
2nd law - tells us how acceleration and force are related
3rd law - tells us that all forces come in pairs
a. True
b. False. immunizations provide lifetime immunity against all preventable childhood diseases.
Final answer:
The statement that immunizations provide lifetime immunity against all preventable childhood diseases is false. Some vaccines require booster shots to maintain immunity, and not all diseases have been eliminated; thus, continuous vaccination is necessary to prevent resurgence and maintain public health.
Explanation:
The statement, "Immunizations provide lifetime immunity against all preventable childhood diseases," is false. Immunizations work by utilizing a component of a pathogen to elicit an adaptive immune response in the body, helping to develop immunity to diseases such as measles, mumps, and chickenpox. However, the duration of immunity can vary. Some immunizations may indeed provide lifetime protection, while others might require periodic booster shots to maintain effective immunity. Additionally, it's crucial to note that immunization usually requires a few weeks to develop full immunity after administration.
Immunization has been instrumental in preventing infectious diseases, saving millions of lives annually, and contributing to the eradication of smallpox and the near elimination of diseases like polio and measles. It's also important to acknowledge that not all diseases have been eliminated, and thus, immunization remains a crucial part of public health.
Furthermore, statements such as "Tuberculosis is a disease that we no longer have to worry about contracting here in the United States" and "Children do not need to be immunized because most diseases preventable by vaccine have been eliminated in the United States" are misconceptions. Continuous vaccination is necessary to keep these diseases at bay and to prevent their resurgence.
The green color of tree leaves is due to green light energy reflected from ____. a. auxins c. chlorophyll b. carbon dioxide d. gibberellins
During what period of time would a behavior disorder most likely be treated with the surgical method called trephining?
Which lists the correct order of processes that occur as water moves from a pond to a cloud and then forms rain
ya call this the water cycle.
This goes as follows:
Evaporation, Condensation, Precipitation.
69th answer btw lol
Which factors must be known to calculate an object's gravitational potential energy
Answer:
The mass of the object, the acceleration of the object due to gravity, and the height of the object
Explanation:
APEX
hope this helps! :)
Supercoiling is an important property of dna tertiary structure that affects essential processes such as replication and transcription. how do cells maintain dna in a negatively supercoiled state? g
"which mineral is most important throughout life to assist in maintaining strong bone?"
Describe how the action potential is regenerated by local ion flux
Final answer:
The action potential in neurons is regenerated by local ion flux, initiated by the opening of sodium channels causing depolarization, followed by the opening of potassium channels leading to repolarization. Voltage-gated channels and the Na⁺/K⁺ ATPase pump are essential for this process, ensuring rapid signal transmission across the nervous system.
Explanation:
The action potential is a crucial process in the nervous system that allows neurons to transmit signals over long distances. It is regenerated by local ion flux through the opening and closing of ion channels in the neuron's membrane. Initially, electrical stimulation triggers the opening of sodium (Na⁺) channels, allowing Na+ ions to rush into the neuron. This influx of positively charged ions depolarizes the membrane, momentarily making the inside of the cell more positive than the outside. If the change is significant enough, potassium (K⁺) channels then open, allowing K⁺ ions to flow out of the cell. This efflux helps to repolarize the membrane, restoring the cell to its resting potential. The Na⁺/K⁺ ATPase pump plays a key role in maintaining the concentrations of Na⁺ and K⁺ ions inside and outside the cell, ensuring that the neuron is ready for the next action potential.
During the repolarization phase, the voltage-gated potassium channels open more slowly than the sodium channels, achieving peak flux shortly after the peak influx of Na⁺. This sequence of events ensures the regeneration of the action potential as it travels along the neuron. Myelination of axons speeds up this conduction and makes it more energy efficient by reducing the number of ions that need to flow to depolarize the myelinated sections of the membrane. This intricate process allows neurons to rapidly and efficiently send signals across the nervous system, highlighting the importance of ion flux in action potential generation and regeneration.
The therapeutic effect of insulin in treating type 1 diabetes mellitus is based on which physiologic action
Final answer:
The therapeutic effect of insulin in treating type 1 diabetes mellitus is due to its role in promoting glucose uptake into cells and facilitating cellular respiration, reducing blood glucose levels.
Explanation:
Therapeutic Effect of Insulin in Type 1 Diabetes Mellitus
The therapeutic effect of insulin in treating type 1 diabetes mellitus is derived from its physiologic action on various cellular functions. Primarily, insulin facilitates the uptake of glucose into cells, which enables the cells to utilize glucose for cellular respiration. This process significantly reduces blood glucose levels. Insulin also assists in the transport of other molecules like amino acids, potassium (K+), calcium (Ca2+), phosphate (P), and nucleotides across the cell membrane. Insulin's action begins when it binds to the insulin receptor, which is a transmembrane protein located on the cell's plasma membrane. In people with type 1 diabetes mellitus, pancreatic insulin production is inadequate, resulting in high blood glucose levels. Insulin therapy replaces the missing hormone and reinstates its vital functions in glucose regulation.
In your laboratory journal, describe the two tools of molecular biology that are often described as the scissors and glue for manipulating dna. describe how these tools of molecular biology combined with plasmids can be used to make copies of an important gene.
The "scissors" of the molecular biology are: DNA Restriction enzymes.
A restriction enzyme is a protein capable of cleaving a DNA fragment at a characteristic nucleotide sequence called a restriction site. Each restriction enzyme thus recognizes a specific site. Several hundred restriction enzymes are currently known.
Naturally present in a large number of species of bacteria, these enzymes have become important tools in genetic engineering.
The "glue" of the molecular biology are: DNA ligase
In molecular biology, DNA ligases are ligase-class enzymes that catalyze the formation of a phosphodiester bond between two segments of DNA. DNA ligases are involved in several essential cellular processes of DNA metabolism: in DNA replication, suture of Okazaki fragments, and in DNA repair and homologous recombination.
The use of these tools in molecular biology: Cloning
Molecular cloning is one of the bases of genetic engineering. It consists of inserting a DNA fragment (called insert) in an appropriate vector such as a plasmid for example. The new plasmid thus created will then be introduced into a host cell, generally the Escherichia coli bacterium. This will then be selected and multiplied to obtain a large amount of the plasmid of interest. Cloning a gene involves inserting it into a plasmid. A clone will be the bacterial transformant that contains this particular plasmid. In this case we speak of clone because all the individuals of the bacterial colony are genetically identical. Molecular cloning is thus different from reproductive cloning (creating an individual genetically identical to another but of a different age) or therapeutic cloning (making tissues from stem cells to perform transplants compatible with the recipient).
Molecular cloning requires restriction enzymes capable of cleaving the DNA, and DNA ligase capable of re-gluing the DNA fragments. Ligase was isolated for the first time from T4 bacteriophage. This enzyme is involved in the repair and replication of DNA. It can bind DNA fragments with compatible sticky ends. At higher concentration, this enzyme is also able to bind two ends of DNA as shown here. T4 DNA ligase works using ATP and Mg ++. It has an activity optimum of 16 ° C, but remains active at room temperature.
The term scissors is used in molecular biology for an enzyme which is known as DNA restriction enzyme. The term glue is used in molecular biology for an enzyme which is known as DNA ligase. These enzymes are used for cutting and sticking the DNA during recombinant DNA technology.
Further Explanation:
Restrictionenzymes commonly known as the scissors in the molecular biology are the enzymes that are used to cut the DNA into smaller parts for cut the DNA from a target sequence. There are enzymes that act as molecular scissors and cut the DNA with overhanging strands. These strands are known as sticky ends. There are also the enzymes that cut the DNA with blunt ends and these ads are known as blunt ends. Restriction enzymes predominantly used in a molecular biology or recombinant DNA technology lab. EcoR1 is the most common example of a restriction enzyme.
DNA ligase commonly known as the molecular glue is used to stick the strands of DNA that are cut by the help of restriction enzymes. A single piece of DNA is formed by sealing the gap between the molecules which is only possible with the help of DNAligase.
Both these enzymes are widely used in the recombinant DNA technology laboratory for the cutting of specific part of DNA and the insertion of intended genes into the plasmid during DNA cloning.
Learn more:
1. Learn more aboutstructural component is found in DNA: https://brainly.com/question/334927
2. Learn more about DNA: https://brainly.com/question/2416343
3. Cell cycle and DNA replication: https://brainly.com/question/1600165
Answer Details:
Grade: High School
Subject: Biology
Chapter: Molecular Biology
Keywords:
Molecular scissors, molecular glue, restriction enzyme, DNA ligase, DNA strand, plasmid, DNA cloning, recognition sites, sticky ends, blunt ends.
What is empirical evidence? A prediction of test results before an experiment A retest of experimental results to make them reliable A conclusion derived from evidence and logical reasoning Knowledge gained by observation or measurement
Answer:
The answer under is the incorrect answer I got wrong cuz of him there is proof under and the real answer is
Knowledge gained by observation or measurement
Which advance resulted from the development of a culture technique for muscle cells?
Answer:
C.) Polio Vaccination.
Explanation:
I got this question on my test
List a few things you would see, that you cannot see now, if your sense of vision were “better.”
If our vision were better, we could see ultraviolet light, interpret infrared as heat signatures, have a much sharper resolution like birds of prey, and detect radio waves. The foveal vision's high concentration of cone cells provides us with our sharpest vision. Animals have developed particular vision abilities for survival, which we would experience firsthand with enhanced vision capabilities.
Explanation:If our sense of vision were "better," a few things that we might be able to see, which are currently beyond human visual capabilities, could include:
The ultraviolet light that certain animals and insects can see, which would reveal patterns in flowers and security features in banknotes.The infrared spectrum, allowing us to see heat signatures much like some species of snakes or devices designed for night vision.A much sharper resolution of sight similar to that of birds of prey, perhaps enabling us to see small details at great distances.More subtle transitions in light intensity, potentially enhancing our ability to see in low-light conditions or at night.The radio waves which make up a part of the electromagnetic spectrumFor instance, the sensitivity of foveal vision refers to the acute vision in the direct line of sight, where the concentration of cone cells is highest on the retina. When focusing on the letter 'G' in the word 'ROGERS,' the letters on either side may appear less sharp because they fall outside the central focus.
Certain animals have highly developed senses of vision to aid in their survival. Raptors have excellent vision to spot prey from afar, and other creatures have advanced night vision for hunting or navigation in darkness.
In the case of a person with cataracts having their lens removed, they become capable of seeing ultraviolet light due to the removal of the natural lens which typically filters it out. Fluorescent substances are used to make clothing appear brighter in sunlight because they absorb UV light and re-emit it as visible light.
Better vision would certainly expand our perception and understanding of the world around us.
The only foods we need to eat are meat, milk, cheese, eggs, and potatoes. true of false
Answer:
False
Explanation:
I recommend eating mostly vegetables, fruit, and whole grains, healthy fats, and healthy proteins. Drinking water instead of sugary beverages. It’s also important to stay active and maintain a healthy weight.
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What do limiting factors control?
the size of an organism
the size of a population
the size of an ecosystem
the size of a habitat
Answer:
size of population
Explanation:
because limiting factor constraints a populations size and slows or stops it from growing.
Water intoxication occurs when _______.
Water intoxication occurs when a person consumes excessive water in a short period, causing electrolyte imbalances, primarily sodium, in the body. Certain conditions like diabetes insipidus or habits like excessive alcohol consumption can contribute to this. This can disrupt the functions of vital organs, particularly the brain and kidneys, causing severe health issues.
Explanation:Water intoxication, or water poisoning, occurs when an individual consumes water in excessive amounts over a short period of time. Our body's balance between water and electrolytes can get disrupted, potentially leading to serious, even fatal, health issues. This is because excess water consumption can lower the concentration of electrolytes in the blood, particularly sodium, causing cells to swell. This swelling can cause multiple health problems, particularly affecting the kidneys and brain.
Conditions like diabetes insipidus, resulting from chronic underproduction of ADH or a mutation in the ADH receptor, can also contribute to water intoxication. In such cases, the kidneys cannot retain water, causing an imbalance. Also, alcohol consumption inversely affects ADH production, which helps our bodies retain water, further contributing to the risk of water intoxication.
Bodies, whether human, animal, or plant, manage their water and electrolyte balances through various mechanisms. In the absence of these mechanisms, or when they are damaged due to a condition or disease, the body's tendency to accumulate excess water can manifest as water intoxication.
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What clinical findings correlate with m.k.'s chronic bronchitis?
Which option associates a type of animal cell with the genetic condition of another kind of animal cell?
Haploid cells contains a single set of chromosomes. A single set is represented as n and there are 23 chromosomes, also called the haploid number. In humans, n = 23. Somatic cells are not haploid, they are diploid (2n). However, we have another kind of animal cells that are haploid: the Gametes.
Which kind of reaction best describes the transmission of information between neurons across the synapse?
Answer:
B
Explanation:got 100
what is the most common task done by forensic odontologists?
This plant produces cones but not flowers. To which of the following groups does this plant belong?
Answer: Gymnosperm
Explanation:
Gymnosperm are the flowerless plants that does not produce flowers but only produces cones.
The term gymnosperm means naked seeds. The seeds of the gymnosperm are not encased within an ovary.
They cones of the plant sit exposed to the surface of the leaf like structure known as bracts.
Example: Conifers, cycads, Ginkgo,
Decomposers and detritivores break down organic material to help form topsoil. which layer of soil contains the decomposers and detritivores that aid this process?
What ions must routinely move across cell membranes?
What are the structural components of myofibril?
Heart sound 2 (choose all correct) is generated by the closing of the atrioventricular valves occurs when the aortic and pulmonary valves backfill with blood marks the beginning of isovolumic relaxation is associated with turbulence during atrial contraction
A garden has 80 pea plants. Of this total, 20 plants have short stems and 60 plants have tall stems. What percentage of the plants have tall stems?
What stage were most of the onion root tip cells in? does this make sense?