A student ws trying to determine how many ice cubes would be needed to keep a glass containing 250 mL of water un 15 degrees celcius for a minimum of 30 minutes
The students perform multiple trials of the same experiment because the surrounding temperature is not uniform every day and also to get more accurate values.
The temperature of the environment.The preliminary temperature of the glass.The number of ice cubes introduced to the water inside the glass.As a way to preserve attention to the converting environmental temperatures (that's a variable in the test), the test needed to be performed each day to get accurate results preserving attention to all the factors.
An experiment is defined as a method by which one or more unbiased variables are deliberately manipulated to confirm or accurate the postulates of the hypotheses that have been created. Its aim is to build up reliable statistics.
Medical experimentation collects the one-of-a-kind strategies/approaches used by researchers to check their theories and assumptions concerning their items of having a look at, through the repetition of certain phenomena located in nature, within the managed surroundings of the laboratory.
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Disclaimer:- your question is incomplete, please see below for complete question.
A student was trying to determine how many ice cubes would be needed to keep a glass containing 250 mL of water under 15°C for a minimum of 30 minutes. The student placed
varying numbers of ice cubes in different cups and recorded the time it took for the water to warm up to 15°C. The student then performed the same experiment each day for a
week. Why did the student perform multiple trials of the same experiment?
regulation of the cell cycle is dependent on cyclins and cyclin-dependent kinases (cdks). the key factor that allows a cell to progress beyond the restriction point in g1 is the absence of cyclin.
Explanation: just being there means little if they can't pass through the checkpoint, their action is more important than their presence
growth in plant is restricted to certain region explain
The amount of a radioactive element remaining in an object is measured. based on the known half-life of the element, the amount remaining can be used to calculate how old the object is. question 10 options: true false
True, The amount of a radioactive element remaining in an object is measured based on the known half-life of the element, and the amount remaining can be used to calculate how old the object is.
One specific attribute all radioactive element have is that they have the capacity of reducing themselves by half of the actual amount in a certain period of time.
Assuming an element "K" has a half life of 3 years. This means that this element "K" will reduce its quantity by half after every three years.
In a case whereby it is specified that some "J" grams of element "K" is found and the age of the substance in which this element "K" is found is to be determined. We use:
N = N₀ * e⁻αt
Where:
N is the inital mass or atomic mass of K
N₀ is the present mass of K
t is the age of substance
α is the decay constant i.e half life
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What is a normal force?
It acts parallel to an object.
It acts perpendicular to an object.
It acts against an object slowing it down.
It acts with an object adding to its speed.
8. Slow twitch fibres (Type1) are efficient at using oxygen to release
energy. They are good at using oxygen because:
Answer:
wut
Explanation:
What was the rationale behind introducing wolves to the Greater Yellowstone Ecosystem (GYE)?
The rationale behind introducing wolves to the Greater Yellowstone Ecosystem (GYE) was to increase the population of wolves to balance the ecosystem.
The Greater Yellowstone Ecosystem was intended to receive these gray wolves (Canis Lupus) in order to boost the wolf population there after it had previously been dispersed due to people killing them off under the presumption that they were predators and were considered dangerous animals.
What is an ecosystem?
All the organisms and the physical setting they interact with make up an ecosystem. The nutrition cycles and energy flows connect these biotic and abiotic elements. Photosynthesis is how energy enters the system and is absorbed by plant tissue.
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a drug which has high affinity for nicotinic receptors on neurons but not on skeletal muscle fibers and is a pharmacological antagonist not an agonist. phm 350 quizlet
Curare (tubocurarine, TUBARINE) is a drug that has a high affinity for nicotinic receptors on skeletal muscle fibers but not neurons is an agonist and causes muscle relaxation.
Cholinergic receptors called nicotinic acetylcholine receptors (nAChRs) are found in the plasma membranes of certain neurons and on the postsynaptic side of the neuromuscular junction. Because they are ionotropic receptors, nAChRs do not depend on second messengers and are connected directly to ion channels.
One non-depolarizing muscle relaxant is Curare, which inhibits the neuromuscular junction's nicotinic acetylcholine receptor (nAChR), one of the two types of acetylcholine (ACh) receptors. By attaching to the acetylcholine receptor (AChR) at the neuromuscular junction, the drug curare blocks the activation of skeletal muscles by nerve impulses (Bowman, 2006).
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describe the five conditions required for hardy-weinberg equilibrium and recognize that all these conditions are not met in real populations, hence allele and genotype frequencies change over time
The conditions to maintain the Hardy-Weinberg equilibrium are: no mutation, no gene flow, large population size, random mating, and no natural selection In a population with random mating.
the Hardy-Weinberg principle connects genotype frequencies to allele frequencies. Consider a population where there is segregation between two alleles (A and B) at a single locus. The letters p and q stand for the frequency of alleles A and B, respectively.
According to the Hardy-Weinberg principle, genotype frequencies will be p2, 2pq, and q2 after one generation of random mating. Genotype frequencies are anticipated to remain constant in the absence of additional evolutionary processes (such as natural selection), and the population is considered to be at Hardy-Weinberg equilibrium. There are several presumptions that the Hardy-Weinberg principle is based on.
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A phospholipid molecule is made up of all of the following parts, except _____.
two hydrophobic fatty acid chains
one hydrophobic head
one glycerol molecule
one negatively charged polar phosphate group
A phospholipid molecule is made up of all of the following parts, except one hydrophobic head.
There are two parts to phospholipids: a head as well as a tail. The phosphate group is located in the "head" of a molecule, which is hydrophilic and will dissolve in the water. Two hydrophobic fatty acids that make up the molecule's "tail" are what prevent it from dissolving in water.
Phospholipid Molecule- Phospholipids is compound lipids made of alcohol, fatty acids, nitrogen base, and phosphoric acids. The cell membrane is mostly made up of these complex lipids, which also give the membranes their fluidity.
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how does ethylene gas affect fruit? a. stabilizes the color. b. makes the fruit taste bitter. c. speeds the ripening process. d. increases shelf life.
Answer:
Explanation:Under neutral conditions, chlorophyll is a pigment that's insoluble in water and gives food a pleasant green color. However, when exposed to heat and acidic conditions, chlorophyll becomes a compound known as pheophytin, which gives food a dull olive brown color.
100 point question and possibly brainliest ill pick my favorite
What is one advantage that PET scans have over X-rays and MRIs?
a-PET scans show how the body is functioning in real time.
b-There are no risks associated with PET scans.
c-Everything that shows up on a PET scan is cancer.
d-PET scans can detect all types of cancer.
Answer:
there are no risks associated with PET scans
Explanation:
While PET scans do use radiation, they don't use as much like X-rays or CT scans do, reducing the risk and allowing you to have multiple PET scans within a short amount of time without danger.
Quinn has a solution of acetic acid and water in one beaker. he carefully makes a second solution of acetic acid and water in a second beaker. these two solutions will have the same properties only if
The two solutions will have the same properties only if the ratio of amount of acetic acid and water is same.
Quinn has a solution of acetic acid and water in one beaker. Also second solution of acetic acid and water in a second beaker is made by Quinn. Acetic acid is a weak acid which reacts with the water in a reversible fashion to form hydronium and acetate ions. An exchange of proton takes place during this chemical reaction.
The two solutions will have the same properties only if the concentration of resulting solutions is same i.e., ratio of amount of acetic acid and water is same.
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is the promoter sequence part of the dna that is transcribed? multiple choice yes, both the -35 and -10 sequences are present on the new transcript. only the -10 sequence is present on the new transcript. neither the -35 nor the -10 sequences are present on the new transcript.
In the promoter sequence part of the DNA that is transcribed, Neither the -35 nor the -10 sequences are present on the new transcript.
Promoters are an important class of regulatory elements that mark the beginning of every transcript. All active promoters contain a large, intricate protein structure known as the pre-initiation complex (PIC), which differentiates promoters from other genome sequences.
The sense strand of DNA, which will be transcribed, and the transcription direction are both outlined by promoter sequences. The TATA box is a conserved promoter sequence that can be found 25 to 35 base pairs upstream of the transcription start site in many eukaryotic genes.
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What type of consumer is a fruit fly?
Answer: primary
Explanation: herbivores or autotrophs feed on only plants to obtain energy. For instance, cows and goats make good examples of these primary consumers. Flies are considered primary consumers because they mainly eat primary producers
1. Describe how changing the rotors' power and speed allow the drone to move
left or right.
Rolling motion is defined as movement of a drone about its longitudinal axis.The drone will move to the left if two of the right propellers spin quickly.
The drone will travel right if its two left propellers are spinning quickly.
What is drone?
An unmanned aircraft is a drone. Drones are more commonly referred to as unmanned aerial vehicles (UAVs) or unmanned aircraft systems. Essentially, a drone is a flying robot that may be remotely controlled or can fly autonomously utilizing flight plans that are managed by software, onboard sensors, and a global positioning system (GPS).
Rolling motion is defined as movement of a drone about its longitudinal axis. The drone will move to the left if two of the right propellers spin quickly. The drone will travel right if its two left propellers are spinning quickly.
The motion of the drone's head rotating around its vertical axis (to the left or right) is referred to as yawning. The drone will rotate counter clockwise if two right diagonal propellers are moving quickly. The drone will revolve counter clockwise if two of its propellers are running in a left diagonal at high speed.
Hence the answer is the drone will move to the left if two of the right propellers spin quickly. The drone will travel right if its two left propellers are spinning quickly.
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the body's circulating fluids are: group of answer choicesthe enzymes and the plasmathe blood and nutrientsthe lymph and fat cellsthe plasma and fat cellsthe blood and lymph
The body's circulating fluids are blood and lymph.
In the human body, there are two types of fluid systems moving all across the body. These fluids are named as blood and lymph.
Blood is a red-colored fluid and its major function is to transport oxygenated blood to the cells and to remove deoxygenated blood. Blood is a part of the circulatory system.
The lymph is a white-colored fluid and the major function of the lymphatic system is to maintain the fluid levels in the body. All the extra leaking cells are removed by the lymphatic system. Lymph s a part of the lymphatic system.
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A phospholipid has two parts - a phosphate head which is ____and fatty acid tails which are _____
Answer:
1. hydrophilic/"water-loving," 2. hydrophobic/"water-hating"
Explanation:
What is an example of a molecule that adds fiber to your diet?
Answer:
There are many but some are brown rice, whole wheat products, almonds, and walnuts.
Explanation:
Hope this helps!
Juan has collected a cricket. Which question can a dichotomous key help him answer.
Answer: Does it have 6 legs?
Explanation:
A farmer grows potatoes by separating out the "eyes" and planting the pieces containing the "eyes". The means by which the farmer grows potatoes is known as
Group of answer choices
sexual reproduction
asexual reproduction
binary fission
cross-pollination
Answer:
my guess would be binary fission, in not 100% sure
Explanation:
Answer: asexual reproduction.
Explanation: the process id called budding
How does the muscular system interact with the digestive system?
A.
Food is moved through the small intestine.
B.
Oxygen is moved into and out of the lungs.
C.
Saliva production increases at the sight or smell of food.
D.
Nutrients are absorbed and transported to other body parts.
Answer:
food is moved through the small intestine
In the geologic past, volcanic eruptions have had an impact on the availability of resources. How can volcanic eruptions impact the availability of resources?.
Volcanic eruptions can deliver such highlights as surges, pyroclastic streams, and mudflows that can cause a major impact on resources.
The gasses and clean particles tossed into the environment amid volcanic eruptions have impacts on the climate. Most of the particles retched from volcanoes cool the planet by shading approaching sun-powered radiation.
The cooling impact can be final for months to a long time depending on the characteristics of the ejection.
Volcanoes have hot, perilous gasses, fiery remains of magma, and shakes that are effectively dangerous. Individuals have kicked the bucket from volcanic impacts.
Volcanic eruptions can result in extra dangers to wellbeing, such as surges, mudslides, control blackouts, drinking water defilement, and rapidly spreading fires.
Further impacts are the disintegration of water quality, fewer periods of rain, trim harms, and the annihilation of vegetation.
Amid volcanic emissions and their prompt consequence, expanded respiratory framework horribleness has been watching as well as mortality among those influenced by volcanic emissions.
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You cut your finger and your are bleeding profusely. It appears to be only in the epidermis. Is this true or false? Name anatomical parts to either defend or justify your answer.
If you cut your finger and you are bleeding profusely. It is FALSE to state that it appears to be only in the epidermis.
What is the explanation for the above answer?
Blood vessels do not exist in the epidermis; they are found in the dermis, the innermost layer of our skin. If you cut yourself and bleed, it signifies you've ripped through the epidermis and exposed the dermis.
It is to be noted that the dermis is a fibrous structure made up of collagen, elastic tissue, and other extracellular components such as vasculature, nerve endings, hair follicles, and glands. The dermis's purpose is to help and shield the skin and deeper layers, as well as to aid in thermoregulation and feeling.
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I need this ASAP please
The amount of food eaten by each organism is not equal to the total amount used by them as a result of heat lost through respiration etc.
What is Respiration?This is referred to as the process in which an organism obtain energy which is usually in the form of ATP by the inhalation of oxygen and the exhalation of carbondioxide.
The amount of food eaten by each organism is not equal to the total amount used by them because activities such as respiration, excretion etc are responsible for the difference. In the trophic level, only 10 percent of the amount of energy is passed from one organism to another.
Zebra = 51698-26712-6602-8438 = 9946.
Hyena = 4682-544-733-814 = 2591.
The amount of food(energy) eaten is different as denoted in the calculation due to some being lost through waste, respiration, heat loss etc.
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Which characteristic best distinguishes these cells as either prokaryotic or eukaryotic
Characteristic best distinguishes from prokaryotic to eukaryotic is that eukaryotic cells have a definite nucleus comprising the cell's genetic material, while prokaryotic cells don't have a nucleus and have free floating genetic material.
Some other differences includes Eukaryotes have membrane bound organelles while prokaryotes do not have membrane bound organelle. Prokaryotes have comparably less DNA then eukaryotes cells. Eukaryotic chromosomes are linear while prokaryotic chromosomes are circular. Prokaryotic cells do not have a true nucleus or membrane-bound organelles, whereas eukaryotic cells contain both a nucleus and organelles enclosed by membranes. All plant cells and animal cells are eukaryotic in nature .
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Does the floor surface affect her for a ball can roll? turn to rap set up one ramp is made of wood and want to smooth. the other ramp is covered in grass a baseball is lego not push from the top of the ramp the rams are both the same height and the same way after letting go of the ball the distance between the ramp and where the bus stop is measured the length is measured in centimeters using a meter stick. what are two controls?
The purpose of this experiment is to see how different ramp surface types affect distance. The least amount of friction will be created by the smoothest surface.
Galileo Galileo demonstrated that objects fall at the same rate regardless of their weight. Newton's first law of motion states that unless acted upon by a net external force, an object at rest will remain at rest and an object in motion will continue to move at a constant speed. Gravity and friction are the two outside factors at work in our experiment. The toy car is being pulled downward by Earth's gravity as it rolls, creating friction and a force when two materials slide against one another.
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What might you conclude about the membrane structure of the final vesicle formed during
exocytosis and the cell membrane?
In the alignment example, there are two places where the sequences differ. If there are a total of 100 bases in the sequence, what would be the percent identity between these two sequences?.
The percent identity between these two sequences is 98 %
Percent similarity" is the sum of two protein sequences' identical and comparable matches. However, studying the sequence identity shared by two protein sequences rather than the similarity is often more informative. There are several definitions of how connected (similar) two amino acid residues are to one another. Because there is no uniform definition of percent sequence identity, the pid function can be computed using any of the following functions:
PID1:
100 * (identical positions) / (aligned positions + internal gap positions)
PID2:
100 * (identical positions) / (aligned positions)
PID3:
100 * (identical positions) / (length shorter sequence)
PID4:
100 * (identical positions) / (average length of the two sequences)
Therefore pid2: 100 * (98/100)
=100 * 0.98
=98%
Therefore, the sequences can be said to be 98% identical.
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How does the use of a scanning electron microscope differ from that of a transmission electron microscope?
A scanning electron microscope can produce only a two-dimensional black and white image, while a transmission electron microscope can produce a three-dimensional color image.
A scanning electron microscope can be used to study live specimens, while a transmission electron microscope would harm the specimens that are being viewed.
A scanning electron microscope can be used to study the details of a specimen's surface, while a transmission electron microscope can be used to study the internal structures of a cell.
A scanning electron microscope can produce images of specimens prepared in liquid, while a transmission electron microscope requires all water to be removed from specimens first.
what is the answer ?? need asap
A scanning electron microscope can be used to study the details of a specimen's surface, while a transmission electron microscope can be used to study the internal structures of a cell.
The main difference between SEM and TEM is that SEM uses transmitted electrons that pass through the sample to create an image, whereas SEM detects backscattered or knock-off electrons to create an image. SEM is ideal when you need to observe a relatively large area and only surface detail is desired.
If you want the interior details of small samples at the near-atomic resolution you need a TEM. The optical microscope has a high resolution. Electron microscopy helps to show the surface details of a sample. Disadvantages Light microscopes can only be used when there is light and are expensive. Electron microscopy uses short-wave electrons resulting in low magnification.
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