Answer:
He concluded that all cells come from preexisting cells.
Explanation:
Rudolf Virchow while building on the work of Theodore Schwann formulated a part of the cell theory which opined that cells arose from pre-exsiting cells which disproved the theory of spontaneous generation
Although this assertion has earlier been made by another scientist, Robert Remak in 1852, Schwann did not accept until later until after series of investigations. Schwann was later accused of publishing the work of Robert Remak as his in 1855.
The other parts of the cell theory include:
All living organisms are made up of cells which could be prokaryotic or eukaryoticCells are the basic unit of life.Answer: Rudolf Virchow's concluded that all cells come from preexisting cells.
Explanation: Rudolph Virchow state that 'Omnis cellula e cellula' which means that every cells arise from preexisting cells. Until Virchow came out with this theory, it was believed that new cells were created from a fluid called blastema ( it was believed that the imbalance caused disease).
Rudolf Virchow's lay the ground work on cellular pathology ( that is the study of disease at the cellular level). His work made it more clear that diseases occur at the cellular level and not blastema as believed. Diseases were diagnosed more accurately by scientist due to Rudolf Virchow's work.
Many scientists believe that dinosaurs became extinct due to
Answer:
A. Medeore. Strike
Explanation:
Under what circumstances should Bipolar Disorder (Manic-Depressive Disorder) be treated with anything other than mood-stabilizing medications?
Lithium and anticonvulsants (and sometimes antipsychotics) are typically the treatment of choice for treating patients with Bipolar Disorder. Is it ever appropriate to use antidepressants in treating a Bipolar patient? Is Electroconvulsive Treatment (ECT), or other alternative modalities, ever preferred for a patient with this diagnosis? Is psychotherapy alone effective or ethical?
Answer:
[tex]x^{2} \sqrt{x}[/tex]
Explanation:
Does species are largest unit of life?
Answer:
no. domain is the largest scale of measuring of life
Why are enzymes needed during DNA replication?
Answer:
An enzyme is a molecule that speeds up a reaction. In the case of DNA reproduction, enzymes not only speed up the reaction, they are necessary for DNA reproduction.
Explanation:
An enzyme is a molecule that speeds up a reaction. In the case of DNA reproduction, enzymes not only speed up the reaction, they are necessary for DNA reproduction.
Recall that DNA is a long strand with a many repeating base pairs. In order for DNA to reproduce, the base pairs must be split apart. One half of the strand is then used as a template to build a new strand of DNA.
The enzyme helicase is responsible for splitting DNA along the base pairs. Helicase moves along the DNA strand unzipping the strand just as a zipper.
What is the function of the flesh of fruits?
Answer:
It serves as an attractant for animals so they can eat it and help in dispersal of the seeds. It also acts as a protective covering for the seeds inside.
Explanation:
What we call the "flesh of the fruit" is actually the ovary of a flowering plant.
Explain how one receptor can induce different phenotypes in different cell types.
Answer:
It is possible since a receptor can activate different signaling pathways in different cell types
Explanation:
In a cell, a receptor bind to a specific ligand to activate a signaling pathway, while the same receptor may bind either with the same or another ligand in another cell type and thus activate another signaling pathway
One receptor can induce different phenotypes in different cell types as a
result of the ability to activate different signaling pathways in different cell
types in the body.
Receptors are compounds which have a particular substrate it binds to which are known as ligands when information is to be conducted from one point to another.
Cells have receptor which bind to a specific ligand in order to activate a
signaling pathway. The receptor however can bind to a ligand found in
another type of cell which explains how it's able to induce different
phenotypes in different cells.
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What is the difference between waxing and waning
Answer:
Waxing and waning moons appear to face different directions.
Answer:
the difference between waxing and waning is.
Explanation:
waxing is when the moon goes from new to crescent, first quarter and so on. waning is when the moon is technically getting smaller. going from full to third quarter second, first, till it gets to cresent moon.
Which agent of erosion most likely moves sediments in a sand dune? *
1)Wind
2)Running water
3)Glaciers
4)Wave action
Explanation:
which agent of erosion most likely moves sediments in a send dune.
Glaciers
The agent of erosion most likely moves sediments in a send dune is wind. Thus, option A is correct.
What is wind?
Wind has been defined as the geological phase through which a landform or land mass has been attached to sediments, soil, and rocks.This occurs when the wind slows down or some barrier, like a rock or a clump of grass, traps the sediment of wind-blown sands.
Wind deposition is an agent of erosion which most likely moves sediments in a sand dune. This increases in pace as the wind passes up and over the barrier. It takes the grains of sand up the gently sloping, salting upwind side of the dune.
Natural sand dunes usually start as windblown sand that accumulates in a sheltered area behind some type of obstacle such as piles of seaweed and a hill of sand made up of wind on the coast or in a desert and it is because of erosion by wind strong winds blow across the loose sand on the surface of the earth including sands found in deserts.
Therefore, The agent of erosion most likely moves sediments in a send dune is wind. Thus, option A is correct.
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what would happen if all of the foxes were hunted until they were gone in a forest ecosystem?
HELPPPPP WILLL GIVE BRAINLIEST!!!!!RATE!!!!! AND THANKS!!!!! EASY BUT IM DUMB!!!!
What two diseases have been studied together that provide evidence of evolution in humans?
A) malaria and ebola
B) cytochrome c disease and plasmodium fever
C) sickle cell anemia and malaria
D) iron-deficient anemia and yellow fever
Answer: The answer is B
Explanation: Sickle cell malaria is a genetic disorder that originated in Africa due to Malaria
Answer:
The answer is B
Explanation:
Is it a, b, c, or d ? (Zoom if you can’t see)
A regular progression of species replacement is called __________.
Answer:
this should help you figure this out!
Explanation:
a somewhat regular progression of species replacement is called succession consists of a community and all the physical aspects of its habitat such as the soil water and weather. Ecosystem.
Ecological succession is the term used to describe a regular progression of species replacement in an ecosystem, whereby increasingly complex species adapt and replace the existing species until a stable climax community is established.
Explanation:A regular progression of species replacement is called ecological succession. This is a process observed in ecology where ecosystems change and develop over time. At the start of this process, a relatively barren area may only support simple life forms such as algae or bacteria. As time progresses, increasingly complex species adapt to the new conditions and replace the existing species. This continues until a stable community is established, often referred to as a climax community. An example of this could be a new volcanic island that initially has no life, but over hundreds of years, becomes a complex forest ecosystem.
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What is the largest sediment that can be transported by a stream that has a velocity of 50 cm/sec?
A)Pebbles
B)Clay
C)Sand
D)Cobbles
The largest sediment that can be transported by a stream that has a velocity of 50cm/sec is; Sand.
Stream VelocityFirst, a general relationship between stream Velocity and diameter of the sediments is that as the stream Velocity increases, the diameter of the sediments increases and vice versa.
Additionally, the slower the stream Velocity, the lighter is the sediment it can transport.
Hence, the stream in discuss can transport sand sediments.
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A stream with a velocity of 50 cm/sec can transport larger sediments. Among the options provided, cobbles are the largest sediments that can be transported by a stream with this velocity.
Explanation:The size of the sediment that a stream can transport depends on its velocity. In the case of a stream with a velocity of 50 cm/sec, it is capable of moving larger sediments compared to a slower-moving stream. From the options provided, the largest sediment that can be transported by a stream of this velocity is D) Cobbles.
Just to give you additional information, pebbles indeed are smaller than cobbles, while clay and sand are still smaller yet, broken down by the stream's kinetic energy into finer particles. Thus, a stream with a velocity of 50 cm/sec has the power to move cobbles, as well as all smaller types of sediment.
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Type ___ blood is the universal donor. Type ___ blood is the universal recipient.
Answer:
O, AB
Explanation:
1) Type O blood is the universal donor.
People with type O- blood are called universal donors because their donated red blood cells have no A, B or Rh antigens and can therefore be safely given to people of any blood group
2) Type AB blood is the universal recipient .
AB positive blood type is known as the “universal recipient” because AB positive patients can receive red blood cells from all blood types.7
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What does it mean for a lipid to be saturated or unsaturated
Rising sea levels could increase the __________ of ground water, making it undrinkable and harming aquatic plants and animals
rising sea levels could increase the salinity of ground water...
Damage to the enteric nervous system that innervates the digestive organs could affect: Damage to the enteric nervous system that innervates the digestive organs could affect:
A. deglutition.
B. salivation.
C. motility.
D. mastication.
Answer:
Option C, motility
Explanation:
Enteric nervous system (ENS) is essential for the motility of esophagus, stomach, small intestine and colon. The neural network of ENS controls the propulsive motility without depending on the connections with the brain or spinal cord. In other way, enteric small brain take care of specialized motility in all differentiated compartments along the digestive tract i.e from esophagus to recto-sigmoid
Hence, option C is correct
Populations and Communities Unit Test 3 of 34Items Item 3 Two closely related species of birds live in the same tree. Species A feeds on ants and termites, while Species B feeds on caterpillars. The two species coexist successfully because they interbreed The two species coexist successfully because each occupies a different niche The two species do not coexist successfully because they compete for food The two species do not coexist successfully because they use different methods of reproduction
Answer: The two species coexist successfully because each occupies a different niche.
Explanation:
Two species of birds that are closely related to each other tend to live on the same tree because they occupy different niche. Two different species coexist as they have different food preferences.
Niche of the species can be defined as the the contribution of the species in the ecosystem and different organism contributes differently in the ecosystem.
There are many factors such as distribution, temporal and spatial distribution which can be different for both of the species.
So, the difference in the niche of the species enables them to coexists.
Which statement about homeostasis is false? Homeostasis depends primarily on positive feedback. Homeostasis is necessary for proper functioning of the body. Homeostasis is the maintenance of a steady physiological state within an organism or cell. The endocrine system plays a major role in maintaining homeostasis.
Homeostasis depends primarily on positive feedback is a false statement rest of all are true about homeostasis, hence option A is correct.
What is homeostasis?It is the condition in which an organism develops, a process through which its body has the ability to maintain stability if any change is occur in the external environment.
Homeostasis results in the following observations:
It is necessary for the proper functioning of the body.The endocrine system plays a central role in maintaining homeostasis.Homeostasis is the supervision of a controlled physiological state within an organism or cell.As external environment is changed there is a need for an organism to change according to the condition for its survival.
Therefore, option A is false about homeostasis.
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Which characteristics of adaptive immunity ensures that vaccination effectively prevents disease?
Explanation:
Immunological memory of adaptive immunity ensures that vaccination effectively prevents disease
When the adaptive immune system is exposed to a new threat, the specifics of the antigen are memorized so we are prevented from getting the disease againThe concept of immune memory is due to the body’s ability to make antibodies against different pathogensA vaccination against a virus can be made using either active, but weakened or attenuated virus, or using specific parts of the virus that are not activeBoth attenuated whole virus and virus particles cannot actually cause an active infection, they mimic the presence of an active virus in order to cause an immune response, even though there are no real threats presentBy getting a vaccination, one is exposing the body to the antigen required to produce antibodies specific to that virus, and acquire a memory of the virus, without experiencing illness
Which type of rock would most likely be weathered by acidic groundwater to produce a cave? *
A) Siltstone
B) Basalt
C) Quartzite
D) Limestone
Answer:
limestones, cause they fwea but nah fr no cap its limestones
Limestone is the type of rock would most likely be weathered by acidic groundwater to produce a cave. So, the correct option is (D).
What is Limestone?Limestone is a type of carbonate sedimentary rock. It is the main source of physical lime made from the mineral calcite and aragonite, which are different crystal forms of CaCO₃. Limestone is formed when these minerals precipitate out of calcium-rich water.
Limestone is formed when slightly acidic groundwater seeps through limestone rocks that dissolve a hole in the rock. The hole grows in size over time to form caves which are sometimes miles long.
Groundwater carries the dissolved calcite in solution and deposits it in other caves as limestone.
Thus, limestone is the type of rock would most likely be weathered by acidic groundwater to produce a cave. So, the correct option is (D).
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The imperial shrimp, Periclimenes imperator, is sometimes seen riding on the back of large sea cucumbers. The shrimp gets to move around to areas with food and expend very little energy, while the sea cucumber is unaffected. What type of relationship is this, and why?
A. Commensalism, because one species benefits
B. Mutualism, because both species benefit
C. Parasitism, because one species is harmed
D. Predation, because one species dies
Is made of genetic material and a protein coat
Answer:
virus
Explanation:
a virus is surrounded by a protein coat
The beaches at a nearby lake have been closed because of high E. coli counts. The lake is surrounded by agricultural areas and summer cottages. We know that different species of vertebrates have different E. coli strains in their digestive tracts. What represents a hypothesis for the source of the high E. coli counts?
Answer:
Runoff from dairy farms causes high E. coli counts
Explanation:
Based on the scenario being described within the question it can be said that one hypothesis for this would be that the runoff from dairy farms causes high E. coli counts. This is because this runoff caries vasts amounts of organisms across the land and brings various animals which drink from the excess water and spread and increase the e.coli count.
Which of the following characteristics is (are) possessed in common by true mosses, ferns, and spike mosses, and therefore becomes useless at helping to determine to which of these groups flower of stone belongs? 1. a sporophyte generation that is dominant 2. true leaves and roots 3. flagellated sperm 4. alternation of generations
Final answer:
True mosses, ferns, and spike mosses possess alternation of generations in common, which becomes useless for determining the flower of stone's group. Other characteristics they share include the presence of a sporophyte generation that is dominant.
Explanation:
Mosses, ferns, and spike mosses share the presence of alternation of generations, which is the cycle of having a haploid gametophyte stage and a diploid sporophyte stage in their life cycles. The sporophyte generation is dominant in these plants, meaning it is the more visible and longer-lived stage.
In terms of the other characteristics listed, true mosses, ferns, and spike mosses differ. True mosses have simple midrib-like structures resembling true leaves, while ferns have fronds and spike mosses have strap-like leaves. True mosses and spike mosses have flagellated sperm, while ferns do not. Additionally, true mosses and spike mosses lack true roots, instead having multicellular rhizoids, while ferns have true roots and leaves.
Why is only a small amount (approximately 10%) of energy available from
one trophic level to the next in a food web? *
Answer:
The amount of energy at each trophic level decreases as it moves through an ecosystem. As little as 10 percent of the energy at any trophic level is transferred to the next level; the rest is lost largely through metabolic processes as heat
Explanation:
Final answer:
Only about 10 percent of the energy at one trophic level is available to the next level, with the rest being used for metabolic processes or lost as heat. This energy loss is why food chains usually have no more than four trophic levels.
Explanation:
Energy is passed up a food chain or web from lower to higher trophic levels. However, generally only about 10 percent of the energy at one level is available to the next level. The other 90 percent of energy is used for metabolic processes or given off to the environment as heat. This loss of energy explains why there are rarely more than four trophic levels in a food chain or web.
State the three basic premises of the modern cell theory
Answer:
1) All living things are made up of cells.
2) Cells are the building blocks/smallest unit of life.
3) All cells come from preexisting cells (cell division).
Explanation:
The three basic premises of the modern cell theory are as follows:
All living organisms whether plants or animals are made up of cells. A cell is the smallest unit of all living organisms.It is the basic structural and functional unit of organisms. Who proposed the cell theory?The cell theory was proposed by German botanist M. J. Schleiden and German zoologist T. Schwann in 1839. They proposed cell theory after studying numerous plants and animals.
Cell theory was further refined by German biologist Rudolf Virchow in 1855. According to him, all cells are arising from pre-existing cells. It may also be represented as "omnis cellula a cellula".
Till then all sorts of living entities are following all the three premises of the cell theory except virus.
Therefore, the three basic premises of the modern cell theory are briefly mentioned.
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Symptoms of protozoan and helminthic diseases are due to
Answer:
Symptoms of protozoan and helminthic diseases are diarrhea, nausea, vomiting, cramps, fever, dehydration, anorexia, abdominal discomfort and weight loss.
Explanation:
Protozoan diseases such as malaria, giardia, and toxoplasmosis caused by protozoan organisms while helminthic diseases are caused by parasitic worms. These worms attack on the helminths which is a body part of human. Symptoms of protozoan and helminthic diseases are due to the attack of parasitic worms and harmful protozoans on the body parts of human beings.
The correct option is b) The damage to host tissues by the parasites. Symptoms of protozoan and helminthic diseases are due to the damage to host tissues by the parasites.
Damage to Host Tissues: Parasites can cause physical harm to the tissues they inhabit, leading to symptoms such as inflammation, pain, and dysfunction of the affected organs.Release of Toxins: Some protozoa and helminths release toxic substances that can directly harm host cells or disrupt normal physiological processes, resulting in symptoms.Immune Response of the Host: The body's immune system reacts to the presence of parasites. This immune response can cause symptoms such as fever, swelling, and tissue damage, as the body attempts to fight off the infection.These mechanisms together contribute to the overall symptoms experienced during protozoan and helminthic infections.
COMPLETE QUESTION
Symptoms of protozoan and helminthic diseases are due to ________.
a) The release of toxins by the parasites
b) The damage to host tissues by the parasites
c) The immune response of the host
d) All of the above
Alexander Fleming discovered a type of that kills bacteria, which led to the development of Penicillin.
Answer:
mold juice
Explanation:
Answer:
mold
Explanation:
he used was studying molds and how they formed when he accidentally discovered an antibiotic substance.
In the moss life cycle _____ cells within a sporangium undergo _____ to produce _____ spores. In the moss life cycle _____ cells within a sporangium undergo _____ to produce _____ spores. diploid ... mitosis ... diploid haploid ... mitosis ... haploid diploid ... meiosis ... haploid diploid ... mitosis ... haploid haploid ... meiosis ... haploid
In the moss life cycle, diploid cells within a sporangium undergo meiosis to produce haploid spores. Therefore, option c is correct
- Sporangium: The sporangium is a structure in mosses that contains diploid cells.
- Meiosis: Within the sporangium, diploid cells undergo meiosis, a type of cell division that reduces the chromosome number by half, resulting in the formation of haploid spores.
- Haploid Spores: These haploid spores are released from the sporangium and dispersed by wind or water, eventually germinating into haploid gametophytes, the next stage in the moss life cycle.
- Alternation of Generations: Mosses exhibit alternation of generations, where the haploid gametophyte generation alternates with the diploid sporophyte generation.
- Importance: This process ensures genetic diversity in moss populations by shuffling genetic material through meiosis, ultimately contributing to the survival and adaptation of mosses in diverse environments.
The complete Question is given below:
In the moss life cycle _____ cells within a sporangium undergo _____ to produce _____ spores. In the moss life cycle _____ cells within a sporangium undergo _____ to produce _____ spores.
a. diploid ... mitosis ... diploid
b. diploid ... mitosis ... haploid
c. diploid ... meiosis ... haploid
d. haploid ... meiosis ... haploid
e. haploid ... mitosis ... haploid