Bacterial growth refers to an increase in the numbers of cells in a bacterial culture. bacterial growth refers to an increase in the numbers of cells in a bacterial culture.
a. True
b. False
The ability of your heart and lungs to work efficiently during physical activity is called
What is one biotic factor that affects the size of a population in an ecosystem? A) local geography B) number of predators present C) average yearly temperature D) average yearly precipitation
Atom A has an atomic number of 19 and mass number of 40. Atom B has an atomic number of 20 and a mass number of 40. Which of these is an accurate statement?
A) Atom A has more protons than Atom B.
B) Atom A has one less proton and one more neutron than Atom B.
C) Atom A has an extra nucleon compared to Atom B.
D) Atom A has one more proton and one more electron than Atom B.
You're answer is B.
I know It's late.
Viruses, bacteria, fungi, protozoa, and parasitic worms are known as __________.
The branch of science that provides a counterexample to the notion that every event has a cause is known as _____. quantum physics quantum computing relativity theory chaos theory
Quantum physics is the branch of science that provides the counterexample to the notion that every event has a cause.
Further Explanation:
Quantum mechanics or physics refers to the wave mechanical model which includes the quantum field theory. It is known to be a fundamental theory found in physics that illustrates the nature at the tiniest scales of the energy levels of the subatomic as well as atomic particles. In quantum mechanics, it describes the wave function and energy level of the atom.
This results in what might appear to be certain strange conclusions related to the physical world. This branch works as an operating system. This facilitates efficient working of physical theories.These theories help in the smooth working of application software.
Application of quantum physics are:
To show the photoelectric effect. To reveal the structure of the atom. To study the covalent bonding and ionic bonding. To study quantum chemistry. Help in laser treatment.
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Answer Details:
Grade: High School
Subject: Physics
Chapter: Quantum Physics
Keywords:
Quantum physics, mechanics, operating system, atomic particles, theories, energy, level, subatomic, branch, nature.
Explain why animal cells cannot capture energy from sunlight and use it to make food
Plants and other organisms convert sunlight, water, and carbon dioxide into food (sugar). Photosynthesis requires chlorophyll. Animal cells lack chlorophyll and cannot photosynthesis.
Why can't animal cells make their own food?The primary transformation of the light energy from the sun into the form of chemical energy that may be utilized by living things takes place in organelles called chloroplasts.
In contrast to plant cells, animal cells do not have chloroplasts, which are organelles that are able to harness natural energy sources such as solar radiation and convert simple chemicals into more complex ones. Chloroplasts have the ability to take in sunlight and make use of it, together with water and carbon dioxide gas, in the process of producing food.
Therefore, animal cells cannot synthesize food from sunlight due to lack of chloroplast.
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In the hershey–chase experiment, dna was demonstrated to be the genetic material because the 32p label for dna localized to ________.
The rise of industrialization was accompanied by _____.
a loss of fertile land
labor-intensive farming
the invention of new raw materials
an increased use of fossil fuels
The correct answer is option D, an increased use of fossil fuels
Reason -
With the advent of new machines and motors engines during the industrialization era, the use of fossil fuels such as coal, petroleum and oil/lubricants increased due to their various applications in the functioning of these modern era machines and vehicles. In fact fossil energy is considered to be major driver of the fossil energy. The first commercial usage of coal , oil and natural gas started from 1800 onwards
Why are sponges considered the simplest animals?
Sponges are multicellular, heterotrophic, lack cell walls, and produce sperm cells, making them comparable to other creatures. They don't have genuine tissues and organs like other animals have.
What feature make sponges simplest animal?Because their bodies don't have organ systems or even tissues, sponges are regarded as one of the most basic organisms.
Instead, sponges are composed of a collection of cells that cooperate to help the sponge satisfy its daily needs.
Although sponges are formed of cells, those cells are not arranged into genuine tissues, making them exceedingly simple organisms. They are not segmented, have an asymmetrical body form, and are not symmetrical.
Sponge feeding is the sole feeding mechanism that separates them from other animals. Because they lack mouths, poriferans suck water through tiny holes in their external walls.
Therefore, sponges considered the simplest animals.
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Sponges are considered the simplest animals due to their basic cellular organization. They do not have true tissues, complex organs or a circulatory system, and rely on diffusion for gas, waste, and nutrient exchange. They represent an early stage of multicellular organisms.
Explanation:Sponges, belonging to the phylum Porifera, are considered the simplest animals due to their primitive cellular organization. Unlike other complex animals, they lack true tissues and organ systems. They represent an early stage of multicellularity and are thought to be similar to the potential ancestors of all animals: colonial, flagellated protists.
Sponges have a single or a few cell layers and they don't have a circulatory system. Instead, gases, nutrients, and wastes are exchanged by diffusion. A large central cavity, the spongocoel, is filled with water that enters from numerous pores in their body wall and flows out through a large opening called the osculum.
Despite their simple structure, sponges are highly successful organisms, having survived on Earth for over half a billion years. They depend on the intracellular digestive processes for their energy intake, a method that requires food particles to be smaller than individual cells. So, their nutrition is also based on a simple method compared to other organisms.
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A bursting forth of blood from the stomach is known as
A bursting forth of blood from the stomach is commonly related to a severe peptic ulcer that has caused gastrointestinal bleeding, often leading to hematemesis, which is the vomiting of blood.
A bursting forth of blood from the stomach is often related to a condition known as a peptic ulcer. This ulcer is a sore in the lining of the stomach, which can sometimes become severe enough to expose blood vessels and lead to bleeding, also known as gastrointestinal bleeding. Factors contributing to ulcer formation include the destruction of the gastric epithelium, leading to acid reaching the stomach wall. Furthermore, ulcers can be formed due to a variety of other reasons such as Helicobacter pylori infection, chronic use of nonsteroidal anti-inflammatory drugs (NSAIDs), or stress.
Emesis, or vomiting, can occur as a body's response to this condition, expelling blood along with stomach contents. Alarmingly, a severe ulcer can expose the wall of stomach vessels causing bleeding that can pose a threat to one's health. This loss of blood can result in what is known as a hematemesis, which is vomiting of blood that may appear as bright red or have a coffee-ground appearance due to partial digestion by acidic digestive juices.
Acute symptoms leading to these severe complications can be a burning sensation or pain in the upper abdomen, often worsening at night and improving with eating, as well as gastroesophageal reflux disease (GERD) which involves heartburn.
Ethics: What are the ethical concerns regarding stem cell research? Briefly describe each side of the debate. What is your opinion about stem cell research?
Research with embryonic stem cells has become the great hope of doctors and scientists worldwide. However, because they deal with embryos, they have also become the subject of controversy.
The discovery that human embryonic stem cells can be isolated and propagated in the laboratory, with the potential to develop in all tissues of the body is an important advance in medicine. But it has raised ethical concerns. Scientists now know that stem cells are also present in adults. If there was a way to stimulate resident stem cells to replace cells that are dying, the limitations of transplantation could be overcome, as well as ethical problems.
Stem cells are cells that have the ability to divide indeterminate periods into culture and give rise to several types of specialized cells. They can become blood, bone, brain, muscle, skin, and other organs. Embryonic stem cells are undifferentiated cells that have the ability to form any adult cell.
As examples of ethical problems, the following questions can be cited:
Is it appropriate to use embryos produced for reproductive and unused uses, whose legal time limits have been exceeded, to generate embryonic stem cells? Is it acceptable to produce non-reproductive human embryos only to produce stem cells? Is it fair to create a climate of expectation for patients and patients' families about the possibility of therapeutic use of cells that have not even been tested in basic experiments?Although it is a polemic subject and it needs to be studied very much, it is not right to see the stem cells as evil and immoral. Stem cell research seeks to develop a technology that can end the suffering of thousands of people around the world, so we must encourage this type of research and try to establish arguments that can answer the ethical questions about this subject.
Which example of artificial selection is caused indirectly by human activity?
A.)choosing sheep that enable offspring to give a large amount of wool
B.)mating goats that produce more milk
C.)selective mating among ducks to produce larger eggs
D.)increased number of small crabs because fishing nets catch mostly large crabs
A client rescued from a burning building has partial- and full-thickness burns over 40% of the body. which initial physiologic change will the nurse expect?
A 3-d movie enhances our sense of depth perception by simulating the effects of
name three properties you could use to distinguish a proton from an electron?
Electrons are negatively charged particles while protons are positively charged particles. Electrons have very little mass while protons are massive particles.
The atom is composed of three fundamental particles which are;
ElectronsProtons NeutronsThe electrons are found in orbits. They all exist outside the nucleus. On the other hand, the protons are found inside the nucleus.
Electrons are very light particles. The electron has an infinitesimal mass while the proton is a massive particle. The proton is 1840 times heavier than the electron.
An electron has a negative charge. This can be easily seen when electrons are deflected in an electric field. Protons are positively charged and are deflected accordingly in an electric field.
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Why would the nurse ensure that a patient's condom catheter is not twisted?
What happens when two species occupy the exact same niche
A. One will cause a primary disturbance
B. They will both increase in population
C. They will help each other
D. Only one will survive
Answer: D. Only one will survive
Explanation:
An ecological niche can be define as the functional role an organism plays in an ecosystem so as to survive. Like, the mode of nutrition, type of habitat chosen for survival and season chosen for breeding are the examples of ecological niche.
If two species occupy the same ecological niche, the species which is more superior over the other will receive all the resources. The species which is inferior will decline and extinct according to the competitive exclusion principle. Hence, only one species will survive.
Why does an action potential only move in one direction?
Action potentials move in one direction due to the refractory period, which inactivates sodium channels in the previous axon segment, preventing backward propagation. This ensures the signal moves from the cell body to the presynaptic terminal continuously. The all-or-nothing nature of action potentials also supports this unidirectional movement.
Action potentials only move in one direction—from the cell body to the presynaptic terminal—due to the refractory period, which prevents them from moving backward down the axon. This period occurs because after an action potential passes through a segment of the axon, the voltage-gated sodium channels in that segment become inactivated and cannot reopen immediately. As the action potential moves from one Node of Ranvier to the next, the downstream segments are depolarized while the upstream segments remain in a refractory state, ensuring that the action potential can only move forward toward axon segments with closed sodium channels ready for rising phase depolarization.This mechanism is supported by the all-or-nothing nature of action potentials, where each depolarization opens the next set of sodium channels, propagating the signal unidirectionally and with full strength down the axon.Treatment of irritable bowel syndrome usually includes making dietary changes and _____.
The health-care provider has suggested that the client use a particular vitamin in megadoses to help lower serum cholesterol. which vitamin is it
Which would have more chloroplasts. root leaf or stem?
Lipoproteins are spherical compounds in which fat clusters in the center and phospholipids and protein form the outside of the sphere. match the lipoprotein on the left with its source on the right.
Lipoproteins are biomolecules that have proteins and lipids that are usually found exteriorly to the cell membrane. These structures function to allow movement of lipids and other molecules inside and out of the cell. Further, these serve in cell-to-cell communication.
During a trip to Galapagos island which Observation led Charles Darwin to suspect that organisms change over time
Galapagos island is the land of unique species of animals and plants. It has 26 types of species of birds and different species of plants that can easily adapt to the environment.
Further Explanation:
The Galapagos Islands is a land of thirteen large islands (archipelago) and a close abouta hundred small islands. Galapagos word has taken from the oldest Spanish word that means tortoise. So that the meaning of word is island of the tortoises. It is a home for unique and different species for example; giant tortoises, sea lions, iguanas and sharks.
On this island, he has observed that there are various types of species of finches. The island has a total 26 types of bird species from which fourteen species are Darwin finches. Darwin observes that Darwin finches are the rapidly evolving vertebrate. The different types of species of finches varied from one land to another. This island also has a unique kind of fauna. They may have evolved from daisies.
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Answer Details:
Grade: High School
Subject: Biology
Chapter: Natural selection
Keywords:
Galapagos, island, archipelago, Spanish, tortoise, giant, iguanas, Darwin, finches, vertebrate, mosses, lichens, faunas, climate.
What can be used to identify a substance or to predict how it will behave?
Answer:
Physical and chemical properties.
Explanation:
By doing some studies, researchers determine specific features of the chemical substance studied, and then it will help other researchers to previously understand how the substance can possibly behave under certain circumstances, like heat or the contact with other substances of the same or different nature.
What does the plasma membrane of a phagocyte attach to on a microorganism? what does the plasma membrane of a phagocyte attach to on a microorganism? pseudopods glycoproteins lysosomes phagosomes?
The plasma membrane of a phagocyte attach to on a microorganism is called the glycoproteins. The glycoproteins’ functions are to identify, adhere to and communicate with the cell, among other functions. This only happens when these glycoproteins are already located in the cell membrane. Sugar molecules are attached to these glycoproteins which are actually proteins. Gathered into short chains which are called the oligosaccharides, these sugar molecules are all found in this area. The glycoproteins are used by the cells which are embedded in the plasma membrane to get the oligosaccharides on the outside of the cell. These glycoproteins normally are attached to the polypeptide side-chains.
Which organism has a central ganglia in its head connected to a ladder-like arrangements of nerve fibers.
A. Spider
B. Seahorse
C. Frog
D. Flatworm
What would happen if the process of mitosis skipped one of its stages?
Why is the nucleus considered the command center of the cell?
True or false: the ability for an animal to use nitrogen in the air depends on the decomposition of animals by nitrogen fixing bacteria