in the laboratory, several factors are known to cause alteration fo the chemical structure of dna. the factor(s) likely to be important in a living cell is (are):
Answers
In a laboratory setting, various factors such as exposure to high temperatures, radiation, chemicals, and mechanical stress can cause alterations to the chemical structure of DNA.
However, in a living cell, the factors that are likely to be most important in causing changes to DNA are DNA replication errors and exposure to environmental agents such as ultraviolet radiation, toxins, and viruses.
During DNA replication, errors can occur in the copying process, leading to changes in the sequence of DNA bases. These errors can range from simple point mutations, where a single nucleotide is changed, to larger structural changes such as insertions or deletions of nucleotides. While the body has built-in mechanisms to correct some of these errors, they are not always successful, and some mutations may persist and lead to changes in the genetic information of the cell.
Environmental factors such as ultraviolet radiation from the sun, toxins in food and water, and viral infections can also cause damage to DNA. Exposure to these agents can result in the formation of chemical bonds between nucleotides or cross-linking between different strands of DNA, leading to breaks and other structural changes. These changes can interfere with DNA replication and repair processes, potentially leading to mutations and genetic instability.
Overall, while laboratory factors such as temperature and chemical exposure can cause alterations to DNA, the factors that are most important in a living cell are DNA replication errors and exposure to environmental agents. Understanding how these factors contribute to DNA damage and mutation is critical for understanding the development of diseases such as cancer and for developing strategies to prevent or treat them.
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Related Questions
What technology involves the deliberate modification of the genetic structure of an organism to create novel products
Answers
The technology that involves the deliberate modification of the genetic structure of an organism to create novel products is genetic engineering.
Genetic engineering, also known as genetic modification or recombinant DNA technology, is a field of biotechnology that involves manipulating the genetic material of organisms to introduce specific changes or traits. This is typically done by inserting or modifying genes within an organism's DNA to achieve desired characteristics or produce new substances.
Genetic engineering has various applications across different fields, including agriculture, medicine, and industrial processes. It enables scientists to develop genetically modified crops with improved traits, create genetically engineered animals for research purposes, produce therapeutic proteins through biopharmaceuticals, and develop novel enzymes or microorganisms for industrial processes, among many other possibilities.
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After observing tadpoles swimming in the water, you could infer that all amphibians have gills.
A)true
B)false
Answers
Answer:
true
Explanation:
you could infer it, but that doesn't make it true!
9. Natural selection explains how ______
change as their environments
Answers
Answer:
Organisms
Explanation:
Natural selection is when organisms adapt to their environment due to "survival of the fittest".
About how much DNA is inside every cells nucleus?
Answers
Explanation:
The haploid human genome contains approximately 3 billion base pairs of DNA packaged into 23 chromosomes. Of course, most cells in the body (except for female ova and male sperm) are diploid, with 23 pairs of chromosomes. That makes a total of 6 billion base pairs of DNA per cell.
Answer:
roughly 2 meters
Explanation:
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A negatively charged sphere is brought near a block with a positive charge of +1. Which situation illustrated below will result in the greatest force of attraction?
Answers
Answer: the one with -2 with 0.5d
Explanation:
n charging by induction, a charged object is brought near an object without touching it. The presence of the charge object induces electron movement and a polarization of the object. Then conducting pathway to ground is established and electron movement occurs between the object and the ground. During the process, the charged object is never touched to the object being charged.
(04.01 LC)
Which of the following conditions is necessary for natural selection to occur? (3 points)
More organisms are born than can survive.
Each individual organism that is born must survive.
There must be no mutations among organisms.
There must be no variation among organisms.
Answers
Answer:
A
Explanation:
The condition that is necessary for the natural selection to occur is that each individual organism that is born must survive. The correct option is B.
What is natural selection?Natural selection is the process by which living organism populations adapt and change.
Individuals in a population are naturally variable, which means they differ in some ways. This variation indicates that some people have traits that are better suited to their environment than others.
Natural selection, Darwin proposed, is a mechanism for evolution in which heritable traits that help organisms survive and reproduce become more common in a population over time.
The phrase "survival of the fittest" refers to the process of natural selection, a mechanism that drives evolutionary change.
The condition for natural selection to occur is that each individual organism that is born must survive.
Thus, the correct option is B.
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Which of the statements represents a correctly worded hypothesis?
If increasing the temperature of a solvent increases the solubility of solutes in it, then
increasing the temperature of water will allow more sugar to dissolve in it.
The solubility of sugar is directly proportional to the amount of energy that water contains,
so sugar will dissolve faster in water that is warmer.
Substances with bubbles have more motion, so boiling water will dissolve more sugar than
cold water because of the bubbles.
If sugar is a polar substance and solutes can dissolve in solvents that are like themselves,
then adding sugar to water will allow the sugar to dissolve at a faster rate.
Answers
Answer:
I believe it is the first one "If increasing the temperature of a solvent increases the solubility of solutes in it, then increasing the temperature of water will allow more sugar to dissolve in it."
Explanation:
Mic determines how much antimicrobial agent to use in vivo. a) true b) false
Answers
The given statement "Mic determines how much antimicrobial agent to use in vivo" is false. The correct option is (b).
MIC stands for Minimum Inhibitory Concentration, which is the lowest concentration of a particular antimicrobial agent that inhibits the visible growth of microorganisms in vitro.
It helps to determine the appropriate dosage and duration of antimicrobial therapy. The MIC value is determined through in vitro testing, which involves growing microorganisms in a controlled environment with various concentrations of antimicrobial agents.
In vivo, the appropriate dosage and duration of antimicrobial therapy are determined based on several factors such as the patient's age, weight, immune system status, renal function, and the type of infection.
The recommended dosage may also vary based on the severity of the infection, the causative microorganism, and the susceptibility of the microorganism to the antimicrobial agent.
Therefore, MIC helps to determine the susceptibility of a microorganism to a particular antimicrobial agent, but it does not directly determine the appropriate dosage and duration of antimicrobial therapy to be used in vivo.
The determination of the dosage and duration of antimicrobial therapy requires a comprehensive evaluation of several factors related to the patient and the infection.
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Which cut on the evolutionary tree would create a clade?
A, B, C, D
(See photo for example)
Answers
Answer:
A
Explanation:
why is asexual reproduction important to prople who grow plants
Answers
Answer: because they can reproduce on their own
Explanation: it makes it easier for them to grow their plants
What is gene replication
Answers
Answer:
Gene Replication:It is the process of copying and duplicating a DNA molecule. The process is carried out in a semi conservative way. This means that the new DNA molecule will consist of two strands: one that is newly created and the other is the original strand.
This is the question I need help with.
Answers
Answer: Brown beetle
Explanation:
It's brown so it blends in with the ground better.
Answer:the answer would be D
Explanation: the brown beetle is SUPPOST to be the tan colored beetle and the the ENVIORNMENT they are asking for is the new desert, in which case the brown beetle (or tan beetle) will have better adapted to the new envionrment (the New desert)
Species
Sequence of Amino
Acids in the Same Part
of the Hemoglobin
Molecules
Human
Horse
Gorilla
Chimpanzee
Zebra
Lys-Glu-His-Iso
Arg-Lys-His-Lys
Lys-Glu–His-Lys
Lys-Glu-His-Iso
Arg-Lys-His-Arg
O A Horse and Zebra are the least related.
O B. Human and Chimpanzee are the least related
O
C. Human and Zebra are more closely related than Human and Chimpanzee
D. Human and Chimpanzee are more related than any other pair
Answers
Answer:
D. Human and Chimpanzee are more related than any other pair
Explanation:
The image in this question shows a tabularized information on the amino acid sequence of hemoglobin protein in different species. This amino acid sequence can be used to deduce whether two or more species are closely related or not. The amino acid sequence of the hemoglobin of the different organisms are as follows:
- Human: Lys-Glu-His-Iso
- Horse: Arg-Lys-His-Lys
- Gorilla: Lys-Glu–His-Lys
- Chimpanzee: Lys-Glu-His-Iso
- Zebra: Arg-Lys-His-Arg
Based on the above sequences, it can be observed that the amino acid sequence of humans and chimpanzee are the same with little to no differences while other species that have similar sequences differ in one or two amino acids. This means that Human and Chimpanzee are more related than any other pair.
Example of how muscle tissue could be used in post-mortem analysis
Answers
Answer:
Skeletal muscle decomposes more slowly than internal organs and nerve tissue after death, but still more quickly than cartilage and bone.
Together, these factors make muscle tissue a good candidate for postmortem change study and well-suited for standard forensic lab examination.
in response to increased blood osmolarity, the osmoreceptors in the hypothalamus are stimulated to release more hormone.
Answers
Increased blood osmolarity, detected by osmoreceptors in the hypothalamus, triggers the production of vasopressin (also known as antidiuretic hormone).
define vasopressin ?
Human vasopressin, also known as antidiuretic hormone (ADH), arginine vasopressin (AVP), or argipressin, is a hormone that is generated as a peptide prohormone in hypothalamic neurons and then converted to AVP. It then travels down the axon, ending in the posterior pituitary, and is released into the blod from vesicles in reaction to ecf hypertonicity (hyperosmolality). AVP serves two key purposes. For starters, it increases the quantity of solute-free fluids reabsorbed back into the bloodstream from the filtrate in the nephrons' renal tubules. Second, AVP restricts arterioles, increasing peripheral vascular resistance & blood pressure.
Vasopressin is produced in response to increased blood osmolarity as recognised by osmoreceptors in the hypothalamus (also known as antidiuretic hormone).
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Write five sentences about the ethical Issues of genetically modified food ?
Answers
Answer:
Five sets of ethical concerns have been raised about GM crops: potential harm to human health; potential damage to the environment; negative impact on traditional farming practice; excessive corporate dominance; and the 'unnaturalness' of the technology.
I need to fill the chart in and then answer the questions:
1. What percent of the children will have brown eyes?
2. What percent of the children will have blue eyes?
3. Is it possible for one of the children to have blue-eyed children in the future?
Answers
Answer:
1. 100%
2. 0%
3. impossible
All their offspring will have brown eyes because they will all inherit the dominant allele for brown eyes. They will all inherit the allele for blue eyes but since this is recessive they will now show it.
the release of antidiuretic hormone results in which of the following? select all that apply. incorrect choices will deduct 0.125 pts.
Answers
The release of antidiuretic hormone signals to conserve water and produce more concentrated urine.
What is an antidiuretic hormone?
Antidiuretic hormone or ADH is made in a part of the brain known as the hypothalamus. ADH plays a role in controlling blood pressure by acting on the kidneys and blood vessels. One of ADH's most important roles is to irritate the volume of body fluids by reducing the amount of water excreted in the urine.
Deficiency of the ADH hormone can cause excessive removal of air from the kidneys resulting in frequent urination (polyuria), which is a symptom of diabetes insipidus. Excess water as a waste product of metabolism in the body will be removed by the sweat glands and kidneys.
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Beans, peaches, and tomatoes are all in the same group of plants. What do these plants have in common? a. Their seeds do not have cotyledons. b. They do not have vascular tissue. c. Their seeds are not protected by fruit. d. They bear flowers and seeds.
Answers
Answer:
D. They bear flowers and seeds
Explanation:
Beans, peaches, and tomatoes are all in the same group of plants. The common thing in these plants is that they bear flowers and seeds.
What do you mean by Seeds?Seeds may be defined as a reproductive unit of flowering plants that are used for sowing.
These plants have unique characteristics and therefore belong to the same group of plants.
Therefore, beans, peaches, and tomatoes are all in the same group of plants. The common thing in these plants is that they bear flowers and seeds.
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How do biogenic sedimentary rocks form?
A. A pre-existing rock deforms when it is subjected to high pressure.
B. Pre-existing rocks are broken down into sediments by organisms
that are lithified.
O c. Shells of marine organisms collect on the seafloor and are
lithified.
a
D. Eroded sediments are transported to a new location and
deposited.
Answers
The biogenic sedimentary rocks form is option C - shells of marine organisms collect on the seafloor and are lithified. This process occurs when the shells of marine organisms such as corals, clams, and snails accumulate on the seafloor over time.
These shells are made of calcium carbonate and when they accumulate in large amounts, they can become compacted and cemented together to form a rock. This type of rock is called a biogenic sedimentary rock. Option A is describing the process of metamorphism, option B is referring to the breakdown of pre-existing rocks by organisms, and option D describes the process of transportation and deposition of eroded sediments, which can eventually form sedimentary rocks, but not specifically biogenic sedimentary rocks.
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Which of the following traits evolved last (most recently) on the "one small step" phylogeny? A. digits B. eyes on top of a flat head C. strong armlike bones D. not enough information to tell
Answers
A phylogenetic analyses is a branch diagram or even a tree that depicts the relationships that have developed over time between different biological species or even other entities based on similar characteristics.
A phylogenetic tree must be constructed in four distinct steps: Identification and acquisition of a collection of homologous DNA and protein sequences, alignment of those sequences, estimation of a tree from of the aligned sequences, & presentation of the tree in a way that makes the pertinent information clear to others are the first four steps. The morphological (body form), biochemical, behavioral, and molecular characteristics of species or other groupings can be used to construct a phylogenetic tree. In order to construct a tree, species are grouped into nested units based on common derived features (characteristics distinct from those of group's progenitor). A common ancestor is typically represented by a single branch at the base of many phylogenetic trees. Such trees are referred to as rooted by scientists, implying that just one ancestral lineage.
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Which of the following are viruses unable to infect?
Answers
Answer:
non living things
Hope this helps :) !!!
Whats the answer help me.
Answers
Answer:b is the answer
Explanation:
the sphincter (that which binds together) muscle at the end of the digestive tract is the
Answers
The sphincter muscle at the end of the digestive tract is responsible for controlling the release of waste from the body. This muscle is located at the anus and is made up of circular muscles that contract and relax to allow for the passage of stool. The sphincter muscle is important for maintaining bowel control and preventing incontinence.
There are two types of sphincter muscles at the end of the digestive tract: the internal sphincter and the external sphincter. The internal sphincter is an involuntary muscle that is controlled by the autonomic nervous system, while the external sphincter is a voluntary muscle that can be consciously controlled.
In some cases, the sphincter muscle may become weakened or damaged, leading to problems with bowel control. This can be caused by a variety of factors, including aging, childbirth, injury, or certain medical conditions. Treatment options for sphincter muscle dysfunction may include pelvic floor exercises, medications, or surgery, depending on the underlying cause and severity of the condition.
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What is the purpose of control in an experiment?
Answers
Answer:
An experimental control is used in scientific experiments to minimize the effect of variables which are not the interest of the study. The control can be an object, population, or any other variable which a scientist would like to “control.”.
Explanation:
Differentiate between irrigation and rainfed agriculture
Answers
Explanation:
Rainfed agriculture is distinguish in most of the literature from irrigated agriculture, which applies water from other sources such as fresh water from stream, river and lake.
according the intermediate disturbance hypothesis, why does diversity decline at less frequent and low levels of disturbance? a. because increasing co-evolution reduces diversity b. because competition disrupts competitive exclusion c. because mortality increases with infrequent disturbance d. because competitive exclusion increases without frequent disturbance
Answers
According the intermediate disturbance hypothesis diversity decline at less frequent and low levels of disturbance because competitive exclusion increases without frequent disturbance. Option D is correct.
According to the intermediate disturbance hypothesis, diversity declines at both very low and very high levels of disturbance, while it is maximized at intermediate levels of disturbance. The reason diversity declines at less frequent and low levels of disturbance is because competitive exclusion increases without frequent disturbance.
Without disturbance, dominant species can outcompete other species, leading to a decrease in diversity. In contrast, at high levels of disturbance, populations are unable to establish and persist, leading to a reduction in diversity.
At intermediate levels of disturbance, however, the balance between disturbance and competitive exclusion allows for a greater diversity of species to persist.
Hence, D. is the correct option.
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Which of these questions is scientific?
A. What community service would make the biggest impact on a city after a hurricane?
B. What type of music would best express sadness in a movie scene?
C. Does the career you choose or the relationships you build bring more joy to your life?
D. How do changes in the acidity of ocean water affect the plants and animals that live there?
Answers
Explanation:A scientific question is one that is testable and can be answered by gathering evidence. Such a question arises from observations, hypotheses, or existing knowledge.
Is a scientific question because it arises from existing knowledge about the relationship between ocean water acidity and marine life.Ocean acidification is a direct result of increased levels of carbon dioxide in the atmosphere due to human activities. Changes in ocean acidity have been shown to have a significant effect on the development, growth, and survival of many marine organisms. As such, this question is scientifically important and is relevant to understanding the impact of human activities on the environment.
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an inherited, progressive disorder of the muscles that affect movement and function is called
Answers
The inherited, progressive disorder of the muscles that affect movement and function is called muscular dystrophy.
A muscular dystrophy is a group of genetic disorders characterized by progressive weakness and degeneration of the skeletal muscles that control movement. It is a progressive disorder that results in muscle weakness and decreased muscle mass. It also causes issues with the heart and breathing muscles as it progresses. Muscular dystrophy is caused by a lack of a protein called dystrophin that helps maintain muscle integrity. In some cases, this lack of dystrophin is inherited, but in other cases, it is caused by a spontaneous genetic mutation. There are several types of muscular dystrophy, with Duchenne muscular dystrophy being the most common and severe form. Other types include Becker muscular dystrophy, limb-girdle muscular dystrophy, and myotonic dystrophy. Treatment for muscular dystrophy varies depending on the type and severity of the disorder.
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What cells of the eye are important for edge detection/contrast?
Answers
Edge detection and contrast are important visual features that allow us to perceive and distinguish different objects and shapes in the visual scene, and these visual features are processed by a network of cells in the retina, including the bipolar cells and the ganglion cells.
Bipolar cells are the second-order neurons in the retina, which receive inputs from the photoreceptor cells and transmit signals to the ganglion cells. Bipolar cells play an important role in edge detection and contrast by enhancing the differences in light levels across adjacent regions of the retina, which allows us to perceive sharp boundaries between objects.
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