An experiment to test a hypothesis would typically involve an experimental group and a control group. The independent variable, such as the use of technology, would be manipulated in the experimental group but not in the control group. By comparing the results of the two groups, the impact of the independent variable can be determined.
Explanation:An experiment designed to test a hypothesis would typically involve two groups: the experimental group and the control group. The experimental group would receive the experimental manipulation or treatment, while the control group would not. By comparing the results between the two groups, any differences can be attributed to the experimental manipulation.
For example, let's say the hypothesis is that using technology enhances learning. The experimental group would use technology during a learning activity, while the control group would not use technology. The dependent variable, in this case, would be the learning outcomes, while the independent variable would be the use of technology.
The experiment would involve measuring the learning outcomes of both groups and comparing the results to determine if there is a significant difference. By controlling other factors that could influence the results, such as the teaching method or the participants' prior knowledge, the experiment can provide evidence to support or refute the hypothesis.
The temperature of the stratosphere increases with height.
True
False
if a hypothesis is falsifiable, _____ A. wrong
B. it might be wrong
C. it must be possible to prove it wrong
D. it is correct
The correct answer is option C
If a hypothesis is falsifiable then it is possible that the hypothesis can be proven wrong. The requirement of falsifibility states that the conclusion of the experiment cannot be drawn from the simple observations which is taken by the help of a particular phenomenon. It can also be called as testability.
Bile
has no effect on digestion.
helps in the digestion of fats.
helps in the digestion of carbohydrates.
helps in the digestion of proteins.
helps in the digestion of both proteins and carbohydrates.
...?
As resources in a population become less available population growth will
Answer:
As resources in a population become less available population growth will decline. An ecosystem can support the growth of a population up to a certain number which is called the carrying capacity of the ecosystem.
Once the carrying capacity is reached in an ecosystem the growth of the population will stop and there will not be any increase in the number of individuals due to limitation of the resource for growth.
So if the resource in the population becomes less available then it can not support the high growth of a population because it decreases its carrying capacity and ultimately decrease the population growth.
In a genetic cross between two flowering plants that are heterozygous for the color trait, red flowers (R) are dominant to white flowers (r). What fraction of the offspring should have red flowers?
Three–fourths of the offspring should have red flowers.
One–half of the offspring should have red flowers.
One–fourth of the offspring should have red flowers.
Answer:
A. Three–fourths of the offspring should have red flowers
Explanation:
What is the best conclusion about the trend in creative careers shown on the graph? The number of people in creative careers has increased because service jobs have increased at the same time. The number of people in creative careers has increased because they left farm jobs that do not require critical thinking and problem solving. The number of people in creative careers has increased because more people work in jobs where critical thinking and problem solving are important. The number of people in creative careers has increased because fewer people work in manufacturing, where critical thinking and problem solving are not needed.
What happens when sunlight Strikes chlorophyll?
There are twenty different types of _____________ which join together in differing sequences and numbers to form different proteins.
Thew correct answer is amino-acids
Amino acids are essential to all life on earth. They are organic molecules comprised out of the amino (NH2) and acidic ( COOH) compound. The twenty amino acids can bound to one another with peptide bonds and form different complex structures called proteins. Proteins are important structural part of cells, enzymes and hormones, and without them the life as we know couldn't exist.
Mitosis and meiosis are processes by which animal and plant cells divide. which statement best describes a difference between mitosis and meiosis?
Answer:D. Mitosis produces genetically identical daughter cells
Correct answer is D
Below are the choices to choose from for an answer:
A. Meiosis is a multi-step process.
B. Mitosis occurs only in eukaryotic cells.
C. Meiosis is used in the repair of an organism.
D. Mitosis produces genetically identical daughter cells
Explanation:
A. Both meiosis and mitosis are multi -step processes.
B. Mitosis also takes place in prokaryotic cells.
C. Meiosis generates gametes used in sexual reproduction.
D. (correct): Cells produced through mitosis contain DNA identical to the parent cells, whereas those produced in meiosis produces cells that are are unidentical.
Mitosis and meiosis are both processes which describe the production of new cells. Mitosis is responsible for producing 2produces 2genetically identical daughter cells . Meiosis on the other side produces 4 unidentical daughter cells, they are different from each other and the parents and they have half number of chromosomes (haploid)
Unlike animal cells, plant cells have cell walls that make them rigid. Which organelle, other than the cell wall, also plays a vital role in providing rigidity to plant cells? A) Nucleus B) Chloroplast C) Central vacuole D) Endoplasmic reticulum
The correct answer is option (c). central vacuole.
The central vacuole is an organelle, which is important for maintaining the turgidity in the plant cell. The central vacuole stores water, minerals, salts and helps the cell to maintain the osmorality.
The central vacuole stores a lot of water in the cell, and swell up due to high water concentration, this provide the turgidity to the plant cell and keep intact with the cell wall.
The central vacuole in plant cells plays a vital role in providing rigidity to plant cells. It is a large, fluid-filled organelle that occupies a significant portion of the cell's volume. Hence option C is correct.
The central vacuole exerts turgor pressure against the cell wall, which helps maintain the cell's shape and rigidity.
When the central vacuole is filled with water and other solutes, it creates osmotic pressure, pushing the cell membrane against the cell wall. This pressure provides structural support and helps the plant cell maintain its shape.
The rigidity provided by the central vacuole and the cell wall together allows plants to maintain upright structures, such as stems and leaves.
While the other organelles mentioned, such as the nucleus, chloroplasts, and endoplasmic reticulum, have important functions in plant cells, they do not directly contribute to the rigidity of the cell.
Therefore, option C, Central vacuole is correct.
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Learning through trial and error is often referred to as _____ learning
A. Instructive
B. Instinctive
C. Instrumental
D. Inherited
It's C - Instrumental
During which phase of mitosis do the nuclear membrane, nucleolus, and nucleus dissolve?
A.) metaphase
B.) prophase
C.) anaphase
D.) telophase
Coal is made from the remains of dead plants. It is made of carbon and other elements. Is coal a mineral?
A Yes, because it is formed naturally.
B Yes, because it contains carbon.
C No, because it is created artificially.
D No, because it is an organic substance.
Minerals are naturally-formed substances that have a specific chemical properties: abiogenic (minerals are not produced by or derived from living organisms, non-organic in origin), stable at room temperature (i.e. at 25 degrees C) , are represented by a known chemical formula , have an ordered atomic arrangement/structure. Coal is not classified as a mineral because it is an organic substance. Correct answer: D (coal is formed from the remains of dead plants and animals).
Which is an example of dehydration synthesis?
A) DNA synthesis from nucleotides
B) Conversions of proteins into its amino acids
C) Conversions of lipids in fatty acids
Does mutations occur in both dna and rna
The largest of the salivary glands is the
a. submandibular.
b. minor.
c. parotid.
d. sublingual.
list two organelles that should have been visible but aren't in the cheek cell
Two organelles that are usually not visible under a light microscope are the mitochondrion and Golgi apparatus.
Cheek cellsIn a typical cheek cell, two organelles that are usually not visible under a light microscope are:
Mitochondria: Mitochondria are often too small to be visible with a standard light microscope. They are the cellular powerhouses responsible for producing ATP, the cell's energy currency.
Golgi Apparatus: The Golgi apparatus consists of a series of membrane-bound sacs and is involved in modifying, sorting, and packaging proteins and lipids for transport within or outside the cell. Its structure is typically not visible with a light microscope at the cellular level.
These organelles are generally visible only with more advanced microscopy techniques, such as electron microscopy.
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Two organelles that should have been visible but aren't in the cheek cell are Mitochondria and Endoplasmic Reticulum (ER)
Why are these organelles not visibleThese organelles Mitochondria and Endoplasmic Reticulum (ER) may not be visible in cheek cells because their size, distribution, or activity levels can make them challenging to observe directly without specialized staining or more advanced microscopy techniques.
However, their presence and functions are essential for the cell's overall function and health because they play a critical role in energy production through oxidative phosphorylation and the citric acid cycle
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URGENT!!!!!!!!!!!!!!!!!!!!!!!!!
Adaptation is possible due to the known mechanism of:
genetic recombination
evolution
mitosis
SOS:
The answer is genetic recombination!
Hope this helps!
Answer:genetic recombination
Explanation:
Matching the following terms and definitions.
1.adaptive radiation
2.coevolution
3.convergent evolution
4.divergent evolution
5.gradualism
6. punctuated equilibrium
a pattern of evolution in which two species evolve in relation to each other
a pattern of evolution in which similar characteristics evolve between two unrelated species
a theory of evolution that states that a species evolves by consistent, small, steps
a pattern of evolution in which very different species evolve from one common ancestor
a theory of evolution that states that a species evolves in spurts of rapid change and then no change
a pattern of evolution in which slightly different species evolve from one common ancestor
Answer:
1. Adaptive radiation: A pattern of evolution in which slightly different species evolve from one common ancestor.
2. Coevolution: A pattern of evolution in which two species evolve in relation to each other.
3. Convergent evolution: A pattern of evolution in which similar characteristics evolve between two unrelated species.
4. Divergent evolution: A pattern of evolution in which very different species evolve from one common ancestor.
5. Gradualism: A theory of evolution that states that a species evolves by consistent, small, steps.
6. Punctuated equilibrium: A theory of evolution that states that a species evolves in spurts of rapid change and then no change.
• Adaptive radiation - a pattern of evolution in which slightly different species evolve from one common ancestor
For example - Evolution of mammals after the extinction of dinosaurs.
• Co evolution - a pattern of evolution in which two species evolve in relation to each other
For example – Development of flowering plant and associated insects or pollinators
• Convergent evolution - a pattern of evolution in which similar characteristics evolve between two unrelated species
For example – similar function of flight or wings of insects, birds and bats
• Divergent evolution - a pattern of evolution in which very different species evolve from one common ancestor
For example – different types of beaks of finches
• Gradualism - a theory of evolution that states that a species evolves by consistent, small, steps
For example – evolution of tigers to develop better line marks on their body
• Punctuated equilibrium - a theory of evolution that states that a species evolves in spurts of rapid change and then no change
Why do we see brown light if it isn't on the color spectrum?
In which of the following ways is DNA replication different from DNA transcription?
New cells can only be created after transcription has taken place.
Replication results in mRNA strands while transcription creates new DNA.
Transcription happens outside the nucleus and replication happens inside the nucleus.
Thymine is used in replication while uracil is used in transcription.
I don't know if this is C or D.
where are photosystems 1 and 2 found
Which cell would be most efficient at absorbing nutrients? A cell with a 8:1 surface area to volume ratio or a cell with a 5:1 surface area to volume ratio? Why?
A spherical cell with a diameter of 5 µm has a higher surface area-to-volume ratio compared to a cubed-shaped cell with a side length of 7µm, indicating it would be more efficient at absorbing nutrients due to its greater surface area relative to volume.
Explanation:The efficiency of a cell in absorbing nutrients depends on its surface area-to-volume ratio. A cell with a higher surface area relative to its volume has a greater ability to exchange nutrients and waste with its environment. In comparing the two cells, a spherical cell with a diameter of 5 µm and a cubed-shaped cell with a side length of 7µm, we calculate their surface area-to-volume ratios to understand which would be more efficient at absorbing nutrients.
For the spherical cell with a diameter of 5 µm, its surface area is approximately 78.54 µm² (π × diameter²), and its volume is approximately 65.45 µm³ ((4/3) × π × (diameter/2)³), giving a surface area-to-volume ratio of about 1.2 to 1. For the cubical cell with a side length of 7 µm, the surface area is 294 µm² (6 × side length²), and the volume is 343 µm³ (side length³), resulting in a surface area-to-volume ratio of approximately 0.86 to 1.
The spherical cell has a higher surface area-to-volume ratio than the cubical cell, and therefore, based on surface area-to-volume ratio alone, it would be more efficient at nutrient absorption. However, it's important to note that in reality, many other factors including cell membrane permeability and the presence of transport mechanisms affect nutrient uptake.
A cell with an 8:1 surface area-to-volume ratio would be more efficient at absorbing nutrients than a cell with a 5:1 ratio due to having more surface area relative to its volume.
The efficiency of a cell in absorbing nutrients is determined by its surface area-to-volume ratio. A higher ratio means the cell has more surface area relative to its volume for nutrient uptake and waste removal. In comparing a cell with an 8:1 surface area-to-volume ratio to a cell with a 5:1 ratio, the cell with the 8:1 ratio would be more efficient at absorbing nutrients. This is because it has more surface area available for exchange relative to its volume.
To provide a quantitative justification, consider a spherical cell with a diameter of 5 µm and a cube-shaped cell with a side length of 7 µm. Calculating the surface area and volume of these shapes, we can derive their surface area-to-volume ratios and determine which cell is more efficient at nutrient and waste exchange with its environment.
plant cells make their own food by taking in
food, water, and wastes are stored inside _______
Vacuole is a membranous organelle present in the eukaryotic cell. Food water and wastes are stored in vacuoles.
A vacuole is a region of cytoplasm-free, membrane-lined, and liquid-filled space inside a cell. A vacuole is a membrane-bound structure that exists in a cell's cytoplasmic matrix. Tonoplast is the membrane encircling the vacuole. The vacuole's components, known as cell sap, differ from the surrounding cytoplasm
Phospholipids constitute the membranes. Proteins embedded in membranes aid in molecule transport across the membrane. Different protein combinations assist the vacuoles retain various things. Plants, fungi, algae, and certain other species also store potent secondary compounds in their vacuoles to shield the cell from self-toxicity, such as tannins or other biological colors.
Therefore, a vacuole is the organelle concerned with storing food, water and wastes.
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Which is not true of laterite soils?
a. they form in the wet tropicsb. they are red in colorc. they are very productive agriculturallyd. they are enriched in iron oxide
Answer: c. they are very productive agriculturally
Explanation:
The laterite soil is reddish to yellow in color. It is typically found in hot and wet tropical areas. The soil exhibit a lower concentration of nitrogen, potassium, lime, phosphorus and magnesia. But soil contains high concentration of oxides of iron, manganese and titanium. It is not suitable for agriculture as the soil lacks essential elements required for the growth of crops like nitrogen, potassium and phosphorus. The soil is suitable for making bricks.
On the basis of the above explanation, c. they are very productive agriculturally is not true for laterite soils.
70 pts The human body is composed of several organ systems. One organ, the brain, controls the functioning of all other organs and organ systems. This organ is part of the ___________ system.
A) circulatory
B) muscular
C) nervous
D) respiratory
What is passive transport? What types of transport are considered passive?
Answer:
Gradpoint answer "Diffusion"
which body system of a pregnant woman shows the most dramatic physiological changes during pregnancy?
Describe and explain the changes in electrical activity both in receptor and in the sensory neurone as increasing pressure is applied to the Pacinian corpuscle?
Increasing pressure on a Pacinian corpuscle opens gated ion channels, causing a receptor potential in the sensory neuron. This graded potential can lead to an action potential if the threshold is reached, which is then transmitted to the central nervous system.
Explanation:Understanding Pacinian Corpuscles and Nervous System Response
When increasing pressure is applied to the Pacinian corpuscle, a mechanoreceptor deep in the skin, changes occur in electrical activity within the receptor and the sensory neuron. Initially, the pressure deforms the corpuscle, causing mechanical pressure on the sensory neuron's dendrite. This mechanical stress opens gated ion channels, resulting in an influx of positive ions like sodium (Na+) into the neuron, thus changing the electrical potential of the neuron.
This alteration in electrical potential is known as a receptor potential, and it is a graded potential, meaning that its magnitude varies directly with the strength of the stimulus. With strong enough pressure, if the receptor potential reaches a certain threshold, this depolarization leads to the generation of an action potential. This action potential propagates along the sensory neuron, sending signals to the central nervous system that pressure has been applied.
Myelin sheaths around neurons facilitate the rapid conduction of these signals, ensuring effective response to the mechanical stimulus. This biological mechanism allows us to perceive variations in touch, pressure, and vibration through our sensory system.
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