Answer:
The answer is "D"
Explanation:
Island theory suggests that you would see all but a large assortment of plant dispersal mechanisms on a well-established island that was once part of a mainland. The plants no longer need an array of dispersal mechanisms; they breed with like species that are near-by on the island. Also, they have an established niche in that location that has proven successful over the decades; whatever they are doing is working.
Hope this helps!
According to island theory, scientists can explain ALL BUT one of these occurrences as a result of Australia becoming and staying an island for a very long time, and that is the presence of marsupials in Australia.
What is island theory?The theory of island biogeography suggests that islands have a limited capacity to support species, and as a result, they tend to have lower species diversity compared to larger land masses. Marsupials, a unique group of mammals characterized by their reproductive strategy of carrying their young in a pouch, are predominantly found in Australia and nearby islands, but not on other continents such as Africa, Europe, or South America.
The presence of marsupials in Australia cannot be explained by the island theory alone, as it would suggest that marsupials would have had to evolve in isolation on the Australian continent, which is unlikely given their close evolutionary relationships with placental mammals found in other parts of the world.
Hence, according to island theory, scientists can explain ALL BUT one of these occurrences as a result of Australia becoming and staying an island for a very long time, and that is the presence of marsupials in Australia.
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Which combination of units can be used to express electrical energy?
The units that can be used to express electrical energy is :
Volt, ampere and seconds ( i.e. volt*ampere*seconds )
Electrical energy is power contained in a charged particle that results in an action been carried out. it is generated by the movement of electrons between atoms.
The S.I unit of electrical energy is Joule and 1 Joule is can be calculated as:
1 Joule = 1 voltage * 1 current * time ( in seconds )
= 1 Volt * 1 ampere * 1 second
hence the combination of units that can be used to express electrical energy aside its' S I unit ( Joule ) is ; volt*ampere*seconds
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What grows on both types of roots and helps absorb nutrients and water?
The brain and spinal cord are wrapped in three layers of tissue known as , between which and the nervous tissue is a space filled with .
A partial dislocation or misalignment of a joint is known as what?
If fluorine was in ionic compounds with ions of each of the following atoms, how many fluorines would be needed?
A. Sodium
4
B. Magnesium
1
C. Aluminum
3
D. Silicon
2
What toxin does staphylococcus aureus release to produce a fever?
Enterotoxin is an exotoxin produced by Staphylococcus aureus which settles in the small intestine and causes inflammation, Inflammation then can cause abdominal pain, dehydration, diarrhoea and fever. Important properties of enterotoxin are that it is a heat stable toxin and resistant to digestive protease. Diseases caused by exotoxins include food poisoning and toxic shock syndrome.
Humans can perceive yellow light because, when the light hits the back of the eye, it stimulates both "blue" and "green" cones. how is this fact related to the fact that one type of odor molecule often stimulates several types of receptors?
What form of vitamin d is the major circulating form with a half-life of approximately 3 weeks?
The major circulating form of vitamin D that has a half-life of about 3 weeks is 25(OH)D or calcidiol. It is created when vitamin D is transformed in the liver and is primarily used by the body to maintain healthy bones and a strong immune system.
Explanation:The major circulating form of vitamin D with a half-life of approximately 3 weeks is 25(OH)D, also known as calcidiol. This form of vitamin D is created in the liver when vitamin D, which can be acquired through skin exposure to sunlight or ingested through food and supplements, is transformed. It is primarily carried in the bloodstream to the kidneys where it's transformed into 1,25(OH)D₂ (calcitriol), a biologically active form of vitamin D.
Vitamin D plays a crucial role in several physiological processes including the absorption of calcium in the intestines, maintaining healthy bones, and immune system function. Low levels of vitamin D can lead to illnesses like rickets in children and osteomalacia in adults, both caused by bone deterioration.
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Gel electrophoresis separates pieces of dna based on _________.
An ecologist observes that a population of plants in a meadow has flowers that may be red, yellow, white, pink, or purple. hypothesize what the inheritance pattern might be.
According to Mendelian inheritance laws, one trait is usually dominant over others in a first generation hybrid which is evident in the crossbreed by Gregor Mendel. Yet, the observed variation of flower colors including red, yellow, white, pink, and purple in the meadow might suggest a pattern of co-dominance or incomplete dominance, where offspring display a mix or 'blend' of parental traits.
Explanation:The inheritance pattern in the population of plants you observed in the meadow could potentially be an example of Mendelian inheritance, which is a primary principle of genetics based on the findings of Gregor Mendel. In his experiments, Mendel crossed true-breeding purple-flowered plants (the dominant trait), with white-flowered plants (the recessive trait). The first generation (F₁) all had purple flowers showing the dominance of the purple flower gene. In the second generation (F₂), created by allowing the F₁ generation to self-pollinate, the ratio was 3:1 for purple:white flowers showing that the white trait had not disappeared but was merely masked in the first generation.
However, considering the range of colors you observed: red, yellow, white, pink, or purple, it's also possible that the inheritance pattern could be co-dominance or incomplete dominance). In these patterns, offspring get a mix of traits or a 'blended' phenotype from their parents, which might explain the spectrum of flower colors.
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A certain species of plant has four unlinked genetic loci, w, x, y, and z. each genetic locus has one dominant allele and one recessive allele. for a plant with the genotype wwxxyyzz, what is the probability that the plant will produce a gamete with a haploid genotype of wxyz
A series circuit is one that:
A. must have only one resistor.
B. has just one path for current to flow.
C. provides no resistance to current.
D. can have current flowing in more than one circuit branch.
The part of the human ear that conducts air between the middle ear and the back of the throat to equalize pressure on either side of the eardrum is called the __________. the part of the human ear that conducts air between the middle ear and the back of the throat to equalize pressure on either side of the eardrum is called the __________. inner ear auditory canal eustachian tube cochlea
Answer:
middle ear
Explanation:
I tried it and it was correct.
What do astronomers expect will eventually happen to the Milky Way galaxy? The Milky Way will collide with Andromeda in 3 billion years forming an elliptical galaxy The Milky Way will wipe out Andromeda with interstellar dust and particles as they collide The gravitational attraction between the Milky Way and Andromeda will collapse them into a black whole as they collide The Milky Way and Andromeda will largely just pass by each other as they approach
The Milky Way will collide with Andromeda in 3 billion years forming an elliptical galaxy
Explanation;The milky way is the galaxy that contains our solar system, while the Andromeda is a spiral galaxy that is the nearest major galaxy to the milky way.It is predicted that the milky way will collide with Andromeda which is our large spiraled neighbor, and merge in about 4 billion years between two galaxies in the local group.The two galaxies are believed to collide head-on and fly through one another, leaving gassy, starry tendrils in their wakes.Which letter represents an organism that could be a primary consumer?
Answer:
B
Explanation:
I just answered that question.
The _______ is moving end of muscle whose tendon attaches to a bone
Pesticides, such as DDT, often have harmful effects on aquatic ecosystems. One harmful effect would be that these pesticides
A) cause fish to become sterile and unable to lay eggs.
B) cause algae and plants to overgrow and pollute the water when they die.
C) accumulate in animals and build up in toxic concentrations as they pass through the food chain.
D) eliminate most of the algae and plants in the food chain, causing animals to starve, at higher levels of the food chain.
Pesticides such as DDT can have harmful effects on aquatic ecosystems. They can accumulate in animals and disrupt the food chain, leading to toxic concentrations. Pesticides can also eliminate algae and plants, causing animals to starve.
Explanation:Pesticides, such as DDT, can have harmful effects on aquatic ecosystems. One common harmful effect is the accumulation of pesticides in animals as they pass through the food chain. Pesticides can be taken up by smaller organisms, such as algae and plankton, and then accumulate in larger organisms, like fish, in toxic concentrations. This can disrupt the balance of the ecosystem and harm the organisms in it.
Another effect of pesticides on aquatic ecosystems is their ability to eliminate most of the algae and plants in the food chain. Algae and plants are the primary producers in aquatic ecosystems, and their reduction can lead to a decline in food availability for animals at higher levels of the food chain. This can ultimately cause animals to starve and disrupt the entire ecosystem.
Therefore, the correct answer to the question is (C) accumulate in animals and build up in toxic concentrations as they pass through the food chain.
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the vertebrate spinal cord develops from the embryonic _____.
The embryonic dorsal hollow nerve cord
The dorsal hollow nerve cord is an embryonic structure that is of a rare quality to vertebrates. It is a bundle of nerve fibers that develops into vertebrate spinal cord and brain. It extends above the notochord and gut and lies dorsally across the longitudinal axis of chordates at some stage of their life.
Which term is a process that is a process that is made up of two other terms
Photosynthesis is a term used to describe a process that combines two other words. This is the method that plants employ to harness solar energy. The words "photo" and "synthesis" both refer to the use of light.
What is a Photosynthesis?The process by which plants, algae, and some microorganisms convert sunlight, carbon dioxide (CO₂), and water into food (sugars), oxygen, and other compounds is known as photosynthesis.
Chloroplasts, a type of plastid (an organelle with a membrane) that is typically found in plant leaves and which performs photosynthesis, are an organelle that contain chlorophyll.
Oxygenic photosynthesis and anoxygenic photosynthesis are the two different types of photosynthetic processes. They both adhere to very similar principles, although oxygenic photosynthesis, which is found in plants, algae, and cyanobacteria, is more prevalent.
Light energy is used in oxygenic photosynthesis to convert water (H₂O) absorbed by plant roots in the form of CO₂ and generate carbohydrates. In this process, the water is "oxidised," or loses electrons, while the CO₂ is "reduced," or gains electrons. Carbohydrates are generated along with oxygen.
By absorbing the CO₂ that is created during respiration and delivering oxygen back into the air, oxygenic photosynthesis acts as a counterweight to respiration.
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The growth of organisms in a beach ecosystem can be limited by the ocean and rocks. True False
What is the electrical current passing through this ammeter?1
Question 1 options:
7.5 amps
8.5 amps
5 amps
10 amps
Question 2 (10 points) Question 2 Unsaved
Which of the measurements would be the most helpful in determining the wavelength?
2
Question 2 options:
W
X
Y
Z
Question 3 (10 points) Question 3 Unsaved
The diagram shows the magnetic field surrounding a bar magnet. The closer together the lines of force, the stronger the magnetic field. According to the diagram, where is the magnetic field the strongest?
3
Question 3 options:
Around the north pole
Around the south pole
Around both poles
In the center of the magnet
Question 4 (10 points) Question 4 Unsaved
Alexandra was preparing to go on a hike in the woods. She gathered the equipment she would need and placed it on the counter. By chance, she placed her compass near an electrical outlet. Although the compass was not moving, the compass needle turned because______________________?
Question 4 options:
The electrical current in the outlet produced a magnetic field.
The compass could only be used outdoors.
The kitchen counter was made of a magnetic substance.
The kitchen had a microwave oven.
Question 5 (10 points) Question 5 Unsaved
The picture shows an experiment used to determine the effect of using more nails in the core of an electromagnet. Which of the following would make this a better designed experiment?
5
Question 5 options:
Using a different number of batteries for each electromagnet.
Using the same number of turns of wire for each electromagnet.
Inserting an ammeter in each circuit between the battery and the nails.
Using a different size battery for each electromagnet.
Question 6 (10 points) Question 6 Unsaved
Ms. Markas takes a Thermos bottle filled with hot coffee to work each day. The Thermos bottle keeps the coffee hot by
Question 6 options:
Using a battery-powered heating element.
Collecting solar heat energy.
Recirculating hot air inside.
Slowing heat transfer from the inside to the outside of the container.
Question 7 (10 points) Question 7 Unsaved
Which of the following would absorb the most sunlight?
Question 7 options:
A white t-shirt
A yellow t-shirt
A black t-shirt
An orange t-shirt
Question 8 (10 points) Question 8 Unsaved
According to the diagrams, long wavelengths__________________________.8
Question 8 options:
Travel more slowly than short wavelengths.
Have a greater frequency than short wavelengths.
Diffract around objects more easily than shorter wavelengths.
Are able to generate far more power than are short wavelengths.
Question 9 (10 points) Question 9 Unsaved
Which of the following would be the best way to determine a glass block's index of refraction?
Question 9 options:
9a
9b
9c
9d
Question 10 (10 points) Question 10 Unsaved
Joseph studied whether different materials can block certain electromagnetic waves by testing television reception in different parts of the house. At each part of the house, Joseph used a different antenna. The experiment could have been improved by _______________________________.
Question 10 options:
Testing reception of a different channel during each trial.
Using the same antenna during each trial.
Measuring the antenna length in centimeters.
Measuring the distance to the television station.
The cartilage on the ends of wendell's joints is deteriorating. around age 65, he developed bony lumps on the end of the joints on his fingers. recently, he has been experiencing joint pain, swelling, and some loss of flexibility. wendell probably has __________.
Osteoarthritis is a form of arthritis that occurs when the protective cartilage on the ends of the bones wears down over time leading to pain, stiffness and swelling. This arthritis can damage any joint in the body, and it mostly affects joints in the hands, knees and spine. From the question given above, Wendell probably has osteoarthritis.
The operon model of the regulation of gene expression in bacteria was proposed by _____. the operon model of the regulation of gene expression in bacteria was proposed by _____. watson and crick franklin darwin jacob and monod mendel
Discovery
The operon model (Lac operon) of the regulation of gene expression in bacteria was proposed by Jacob and Monod and hey got noble prize in 1965 in Physiology and Medicine for this discovery.
Definition
“Operons are cluster of coregulated bacterial genes which regulate other genes responsible for protein synthesis”
Explanation
Operons were first studied in the bacterium E.coli, and they involve the enzyme of lactose metabolism and tryptophan biosynthesis.
Structure of Operon
Operon is generally composed of three basic DNA components:
1. Promotor:
It is a nucleotide sequence which is recognized by RNA polymerase and initiate transcription.
2. Operator:
It is a segment of DNA that is present between the promotor and other genes to be transcribed. In presence of repressor, RNA polymerase is physically obstructed and cannot transcribe the genes. In the absence of repressor, operator is active and start transcription of other proteins.
3. Structural genes:
These genes are responsible for synthesis of targeted proteins under the influence of operator.
Example of operon model:
In bacteria two operon model have been extensively studied, these are:
a. Lac Operon, and
b. Tryptophan operon
The operon model of the regulation of gene expression in bacteria was proposed by François Jacob and Jacques Monod. They discovered that related genes in bacteria are organized into blocks called operons, which are controlled by a single promoter. An example of this is the lac operon in E. coli, which controls the expression of genes related to lactose metabolism.
Explanation:The operon model of the regulation of gene expression in bacteria was proposed by the French scientists François Jacob and Jacques Monod. These scientists demonstrated the organization of bacterial genes into operons, through their studies on the lac operon of E. coli. They proposed that structural proteins with related functions are usually encoded together within the genome in a block called an operon, and are transcribed together under the control of a single promoter, resulting in the formation of a polycistronic transcript.
For example, in E. coli, all of the structural genes that encode enzymes needed to use lactose as an energy source lie next to each other in the lactose (or lac) operon. This operon contains a promoter sequence to which the RNA polymerase binds to begin transcription. Between the promoter and the three genes is a region called the operator; the presence or absence of lactose determines whether a protein, known as a repressor, binds to this operator and prevents RNA polymerase from binding to the promoter. As such, the lac operon is a model for gene regulation in prokaryotic cells.
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When luke kissed laura, her heart rate increased. luke always wore axe body spray. whenever laura smelled axe body spray, her heart raced. the smell of the body spray was the:?
Final answer:
The smell of the Axe body spray, which caused Laura's heart to race after being associated with Luke's kiss (an unconditioned stimulus that naturally increased her heart rate), is identified as c. conditioned stimulus.
Explanation:
When Luke kissed Laura, her heart rate increased. Luke always wore Axe body spray. Whenever Laura smelled Axe body spray, her heart raced. The smell of the body spray was the conditioned stimulus. In classical conditioning, a conditioned stimulus is something that, after association with an unconditioned stimulus (in this case, the kiss, which naturally increases heart rate), comes to trigger a conditioned response (increased heart rate). Therefore, the correct answer is c. conditioned stimulus.
Classical conditioning is a learning process that occurs through associations between an environmental stimulus and a naturally occurring stimulus. It's key to understand that the unconditioned stimulus elicits a natural reaction without prior conditioning, whereas a conditioned stimulus comes to elicit a response after being paired with an unconditioned stimulus. This concept has been pivotal in understanding how organisms learn from their environment.
Some insecticides interfere with the removal of acetylcholine from the synaptic cleft. what effect will this have on muscle contraction
When insecticides interfere with the removal of acetylcholine from the synaptic cleft, it can lead to prolonged muscle contraction. This occurs because the insecticides inhibit the activity of the enzyme acetylcholinesterase, resulting in an accumulation of acetylcholine and continuous muscle stimulation.
Explanation:When some insecticides interfere with the removal of acetylcholine from the synaptic cleft, it can lead to prolonged muscle contraction. Normally, after acetylcholine transmits the nerve impulse across the synapse, the enzyme acetylcholinesterase breaks it down to prevent continuous stimulation of the muscle. However, these insecticides inhibit the activity of acetylcholinesterase, resulting in an accumulation of acetylcholine in the synaptic cleft, which then continues to stimulate the muscle. This can cause muscle spasms, twitching, and even paralysis.
How has gene duplication played a critical role in evolution? see concept 21.5 (page 452)?
Gene duplication is crucial to evolution as it allows organisms to evolve new functionality without losing the original, essential function. It can result in the creation of new proteins and open avenues for adaptation and evolution. Therefore, gene duplication is at the heart of how new species evolve and diversify.
Explanation:Gene duplication plays a critical role in evolution by providing material for the evolution of new functions. This process occurs when an entire gene is duplicated in the genome. This duplication allows one copy of the gene to be altered by mutation, selection, or drift, while the other copy continues to produce a functional protein. This means the organism can retain the original function of the protein while the duplicate gene evolves to take on a new function. This capacity for functional evolution while maintaining vital genetic information has been fundamental in diversifying life on earth.
In the same way, gene duplication allows for the potential evolution of new variant proteins without eliminating the original, functional protein. This provides an avenue for adaptation and evolution without the harmful effects of losing essential proteins.
Overall, gene duplication is a fundamental process in the mechanisms of evolution and drives the diversity and unity of life.
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What “sphere” is the largest reservoir of nitrogen?
The atmosphere
Atmosphere is a thin layer of gases that floats over the surface of the planet. The atmosphere is composed of 78% nitrogen, 21% oxygen, and 0.93% argon. The remaining 0.07% consists of water vapor, carbon dioxide, ozone and noble gases. The reason for the abundance of nitrogen in the atmosphere is because it does not react or bond with other elements.
Correct Answer:
Atmosphere
Where can cells that are able to differentiate be found?
E2020
Answer: D) in amniotic fluid
Cells capable of differentiation, also known as stem cells, can be found primarily in embryonic stage and in various tissues throughout an organism's lifespan where they are essential for repair and replenishment of tissues.
Explanation:Cells that are capable of differentiation can primarily be found in two places within an organism. The first is within embryonic cells during the early stages of development. These are also known as embryonic stem cells. The second type are adult stem cells, found in various tissues in the body such as the bone marrow, blood, and brain, and are responsible for repairing and replenishing tissues throughout the lifespan of the organism.
Cell differentiation is a process in which a cell changes from one cell type to another. Often, the cell changes to a more specialized type. This process is essential for creating and maintaining the vast array of cell types in an organism.
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Proteins are made up of amino acids. there are _____ amino acids, and _____ of them are essential.
Proteins are made up of amino acids. There are 20 amino acids, and 9 of them are essential.
What are these amino acids?Essential amino acids are those that the body cannot produce on its own and must be obtained from the diet. Non-essential amino acids can be produced by the body.
The 9 essential amino acids are:
HistidineIsoleucineLeucineLysineMethioninePhenylalanineThreonineTryptophanValineThe other 11 amino acids are non-essential.
The sequence of amino acids in a protein determines its structure and function. Proteins are essential for many biological processes, including growth, repair, and metabolism.
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individual cells can be isolated from a mature plant grown with special mixtures of growth hormones to produce a number of genetically identical plants. this process is known as
Tissue culture, also known as micropropagation, is a biotechnological process in which plant cells are grown with growth hormones to produce genetically identical plants.
Explanation:The process described in the question is known as tissue culture or micropropagation. It is a technique used in biotechnology to produce a large number of genetically identical plants from a single plant cell or tissue. Plant cells are isolated and grown in a sterile environment with a special mixture of growth hormones, under controlled conditions. The hormones, typically auxins and cytokinins, stimulate the plant cells to divide and differentiate, eventually forming a whole plant. Each of these plants will have the exact genetic makeup of the original specimen, which makes this process especially useful in agriculture and horticulture for reproducing high-quality plants.