At what stage of human development would you expect to first see a beating heart?
Choose 1 answer:
Choose 1 answer:
(Choice A)
A
Zygotic stage
(Choice B)
B
Blastocyst stage
(Choice C)
C
Embryonic stage
(Choice D)
D
Fetal stage
at what stage of human development wuold you exept to first see abeating heart? the answer is ç
The stage of human development that is expected to first see a beating heart is the embryonary stage (Option C).
The heart of an embryo starts beating at approximately week 5 of pregnancy.The first two weeks of human development after conception is called the germinal stage, whereas the stage of development lasting from the third until the eighth week of pregnancy is called the embryonic stage.This stage (embryonic stage) starts once the zygote is implanted in the uterine wall.In conclusion, the stage of human development that is first expected to see a beating heart is the embrionary stage (Option C is correct).
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4. What is an energy pyramid? Why is there a loss of energy at each level
moving up?
Answer:
#1 An ecological pyramid is a graphical representation designed to show the biomass or bioproductivity at each trophic level in a given ecosystem. And #2 Most of the food energy that enters a trophic level is "lost" as heat when it is used by organisms to power the normal activities of life. Thus, the higher the trophic level on the pyramid, the lower the amount of available energy.
Explanation:
environmental factor in fresh water, ocean trench, hot springs, terrestrial and problems caused for each
Answer:
sorry don't know but I need points plese mark me as brainlest
Explanation:
I want free points
which organelle builds proteins
Answer:
I belive its ribosomes.....
Explanation:
Theres an old man needed your help but you are soo late in your work.What would you do?explain it briefly.
Answer:
I will help him first
Explanation:
because it's our duty to help elders .
What is the per capita growth rate of a population of 250, with 50 births and 80 deaths in a year?
One half of a duplicated chromosome is called:
Telomere
Chromatid
Chromatin
Centromere
One half of a duplicated chromosome is called Chromatid. The correct option is B.
Thus, A chromatid is the name for the duplicated half of a chromosome. The chromosome is duplicated during DNA replication, creating two identical copies known as sister chromatids.
The centromere, a particular area, is what holds these sister chromatids together. A complete set of DNA molecules or genetic material can be found in each chromatid. During cell division, the sister chromatids split apart to form individual chromosomes, which are then dispersed to the daughter cells.
Contrarily, the telomeres are specialized structures found at the ends of chromosomes that aid in maintaining the DNA's integrity during replication and guard against deterioration.
Thus, One half of a duplicated chromosome is called Chromatid. The correct option is B.
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What type of macromolecule is an enzyme?
carbohydrate
lipid
protein
nucleic acid
what directs the action of every cell in your body
Answer:
the nucleus of the cell
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development of continuous flow systems to access secondary amines through previously incompatible biocatalytic cascades
The use of continuous flow reactors enabled previously inaccessible enzyme combinations in multi-enzyme cascade reactions.
The combination of oxidases with aminating biocatalysts (transaminase/reductive aminase) and was extended to the continuous in situ biocatalytic generation of amino donors for the reductive aminase.
The reaction cascades described here started with the generation of aldehydes from stable and commercially available alcohols. As aldehydes are versatile yet unstable intermediates, it was thought a continuous flow system that generated this group in situ at high concentrations could allow for a range of subsequent enzymatic modifications. Biocatalytic oxidations are fundamental in transitioning to a bio-based economy, in particular the use of oxidases which carry out selective oxidation using molecular oxygen as the sole oxidant.
For the first time it has been shown that previously incompatible enzyme cascades can be run continuously, greatly improving the metrics (up to 58-fold for STY and 4-fold for enzyme productivity) when compared to the equivalent batch reactions. This system is extremely versatile with several enzyme combinations tested that enabled the generation of a range of amine intermediates. The reactors were also extended to demonstrate proof-of-concept, high throughput reaction screening in continuous flow. A continuous synthesis of the biologically relevant molecule 4O-methylnorbelladine was also successfully demonstrated. Using a continuous approach allows many additional benefits to those discussed here to further improve biocatalytic reaction efficiency.
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What would happen if sulfur was removed entirely?
Sulfur is essential for humans, animals and plants. When it enters our body, it can be incorporated into tissues such as skin and cartilage. It is also found in some proteins and vitamins. if the sulfur were completely removed, it causes several symptoms, such as depression, neuritis, unpleasant odor in the saliva and a decrease in the brightness of the skin. To avoid this deficit, it is recommended to eat fruits and vegetables. Foods of animal origin such as milk and eggs also have it in their constitution.
What is the role of sulfur in the human body?Another great advantage of sulfur is that it has anti-inflammatory action, in addition to being an antioxidant. This means that it fights free radicals and also increases the body's defense against invading agents, preventing, for example, the flu. In addition, the mineral helps to detoxify the body.
With this information, we can conclude that Sulfur dioxide is a toxic gas that mainly affects the mucous membranes, acting on the respiratory system and eyes, causing irritation.
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which is a true statement regarding metastasis? group of answer choices increased cell-to-cell adhesion helps metastasis. lack of proteases and collagenases aids in metastasis. cells must first escape the basement membrane of tissue. penetration of the basement membrane of the vessel occurs first.
The correct option is (C) cells must first escape the basement membrane of tissue.
The process through which cancer spreads is described as "metastasis."
What is metastatic cancer?Unlike normal cells, cancer cells have the ability to spread outside of the area of your body from which they originated. These conditions are referred to as metastatic cancer, advanced cancer, or Stage IV cancer. Tumor cells must first exit the basement membrane of the tissue of origin, migrate through the extracellular space, and then pierce the basement membrane of the vessel in order to reach the blood or lymphatic circulation.Metastatic cancer may occasionally be cured. However, for the majority of metastatic malignancies, medication can lessen symptoms while also slowing the spread of the disease. Even after the onset of metastatic disease, several cancer types can be managed for many months or even years.Learn more about the Metastasis with the help of the given link:
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Which part of the mollusk body is specialized for burrowing,feeding , and movement
Answer:
The foot
Explanation:
Mollusks have bilateral symmetry and are coelomed protostomes, but the coelom is only represented by small residual spaces around the pericardial cavity, the gonads, some parts of the nephridia, and in some cases part of the intestine. The foot is used primarily as a means of movement. The foot is also a very important structure, although it has adapted differently depending on the classes of mollusks. It is characterized by having a really powerful and complex musculature. The most widespread use of this organ is that of locomotion, as happens with gastropods. However, in bivalves it serves to burrow or in cephalopods it helps to provide propulsion.
Invertebrate animals with the unsegmented soft body which is enclosed in shells made up of calcium carbonate are called Mollusca.
The part of mollusk's specialized in feeding, burrowing and movement are:
Foot
The Mollusca can be explained as:
The Mollusca have the bilateral type of symmetry and coelomate protostomes which are visible as residual spaces surrounding the pericardial cavity, nephridia and gonads.The foot is the part that is used in locomotion and is adapted differently for various purposes in various forms of Mollusca.It has a complex musculature and helps in propulsion, as a mode of feeding appendage and in some for burrowing purposes.Therefore, the foot is a specialized organ.
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the capacity of a brain area to develop new neural pathways as it adjust to good and bad experinces is known as
The capacity of a brain area to develop new neural pathways as it adjust to good and bad experiences is known as Neuroplasticity.
Neuroplasticity also known as brain plasticity is defined as the ability of the nervous system to change its function and develop new pathways in response to new information.
Neuroplasticity is the changes that happen to the brain over the years. These changes depend on the new experiences which can be good or bad. It also depends on environmental influences, practice, and psychological stress.
Neuroplasticity play an important role for healthy development, learning, memory.
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The capacity of a brain area to develop new neural pathways as it adjusts to good and bad experiences is known as neuroplasticity
Neuroplasticity is a broad term related to the brain's capacity to alter, modify, and adapt its function and structure across people's lives and in response to stimuli.
Individual differences in brain function and structure contribute to the variability observed in neuroplasticity mechanisms, which also show significant differences across individuals. Indeed, a growing body of recent research indicates that the guidelines and mechanisms governing cortical plasticity seem more dynamic than previously thought.
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help asap 1st answer gets brainliest
Answer:
it looks like it is B
Explanation:
Hope this helps!! :D
what did you learn about climate change new words new ideas new conepts
The effect of population distribution and density on the environment and natural resources is known as.
The effect on the environment and the natural resources by population distribution and density is termed Carrying capacity.
Carrying capacity refers to a species' average population size in a particular habitat. The environment can regulate a species' population size by providing enough food, shelter, water, and mates. If these needs are not met, the population will decrease until the resource is replenished.
Population composition can be characterized by the pattern produced by age distribution and gender ratio at different scales and locales. The population's distribution and density both show the influence of demographic composition.
Hence, the effect of population on its environment is called as carrying capacity as this will tell us that for how long will the environment be able to sustain that population size.
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An increase in the membrane permeability for a solute will result in an increase in the driving force for diffusion of that solute through the membrane. True or false?.
A membrane's permeability has an impact on the diffusion rate. As membrane permeability increases, the diffusion rate rises.
The dispersion of materials is also impacted by changes in temperature and pressure values.The passive diffusion rate of penetrated molecules through the biomembrane can be used to quantify a membrane's permeability. It is well acknowledged that the permeability of any particular molecule depends mostly on its size, polarity, charge number, and molar mass.The capacity for materials to flow into and out of a membrane is known as permeability. The ease with which a chemical can diffuse across a cell membrane determines its permeability.Only chemicals that can dissolve in fat can typically pass through a cell membrane.The electrical potential gradient across the cell membrane and the concentration gradient of the permeant ion across the membrane together make up the net electrochemical driving force.Learn more about permeability here:
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What phase of the cell cycle does DNA replication occur?
a
G1
b
S
c
G2
d
M
e
cytokinesis
Answer:
s phase
Explanation:
so the genetic material can double before it begins division
A combination of DNA and protein molecules that exists in a loose, web-like form is known as ________.
chromosomes
histones
centromeres
chromatin
Answer:
The answer is Chromosomes
A order arrangement of properties is called
Answer:
its order of operations
The cell membrane has____. a) polar heads on the outside and nonpolar fatty acids on the inside b) nonpolar fatty acids on the outside and a polar heads on the inside c) polar heads on both inside and outside d) nonpolar fatty acids on both inside and outside
Answer:
a) polar heads on the outside and nonpolar fatty acids on the inside
Explanation:
The cell membrane is made up of phospholipids arranged in a bilayer, where hydrophilic polar (negatively-charged) heads of phospholipids interact with water molecules (i.e., aqueous surrounding media). Moreover, non-polar (uncharged) fatty acid tails are hydrophobic because they cannot be dissolved in water. Thus, the bilayer cell membrane is a structure where non-polar fatty acid chains are localized in the inner region (away from the water), while hydrophilic phosphate heads face outward, interacting with water on both sides of the cell membrane.
sustainability can be excercised in the harvesting of many different natural resources describe how t
Fishing until reaching an established quota that allows the fish population to rebound each season is a method of sustainable fishing
What is sustainability ?The main objective of sustainability is for people to live in peace and harmony on Earth for an extended period of time. Specific definitions of sustainability are difficult to agree on and hence vary in the literature and across time
Sustainability is often represented diagrammatically. The figure at the top of this page suggests that there are three pillars of sustainability – economic viability, environmental protection and social equity.Sustainability is important for many reasons including: Environmental Quality – In order to have healthy communities, we need clean air, natural resources, and a nontoxic environment. Growth - UNTHSC's enrollment continues to expand, thus we demand additional resources such as energy, water, and space.Learn more about Sustainability here:
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preclinical alternative model for analysis of porous scaffold biocompatibility applicable in bone tissue engineering
A promising method for repairing critical-size bone lesions is the use of scaffolds with the proper porosity. For the creation and mending of bones, vasculization is necessary. In this study, chitosan and polyhydroxybutyrate (PHB)-based porous biopolymer scaffolds are used to evaluate angiogenesis.
What is Tissue engineering ?Using a combination of cells, engineering, materials techniques, and appropriate biochemical and physicochemical parameters, the biomedical engineering field of tissue engineering can repair, maintain, enhance, or replace several types of biological tissues.
Skin, cartilage, bone, heart valves, and bladder are just a few examples of tissue engineering that are now being used in therapeutic settings. Numerous further examples, including as artificial livers, pancreas, and blood arteries, are still being studied and tested on animals.Learn more about Tissue engineering here:
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Which is not a function of cholesterol within the cell membrane?
Reduces permeability to some solutes
Reduces membrane fluidity
Prevents crystallisation of the membrane at low temperatures
Transports molecules across the cell membrane
Answer:
c
Explanation:
The function of cholesterol within the cell membrane maybe be many, but does not include the reduction in membrane fluidity .
The steric structure of the cholesterol in the cell membrane is such that:
it prevents freezing of the membrane when the temperature gets lowIt limits the permeability of some materialsit makes the membrane more fluid and stableit helps take up cholesterol from the surrounding environment into the cell, hence, helps with the transport of molecules.The correct answer as to which is not a function of cholesterol within the cell membrane would, therefore, be that it reduces membrane fluidity.
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Why were garden peas a good choice for a study of heredity?
Answer:
pea plants because they were easy to grow, could be bred rapidly, and several observable characteristics, like petal color and pea color.
Explanation:
Differences between epithelial and meristematic tissue.
Answer: Epithelial tissue is the internal and external lining of the surfaces of organs. Connective tissue connects tissues and organs.
Explanation: Good Luck!
Answer:
1. A tissue which covers body surfaces such as lining of organs and skin, and tissue which plays role in secretion, protection and absorption is referred as Epithelial tissue.
A tissue which is composed of fibers, water, and adhesion proteins and which connects parts of body together, this is referred as Connective tissue.
2.It lines organ surfaces, the cavity, and blood vessels of the animal body.
It connects, and supports different organs and tissue in the body.
classify each electrolyte as an intracellular or extracellular anion (negatively charged ion) or cation (positively charged ion).
Electrolytes are substances that, when dissolved in water, conduct electricity. A variety of biological functions depend on electrolytes. They acquire a natural positive or negative electrical charge.
What is intracellular or extracellular ions?
Electrolytes are classified as both intracellular fluid and the extracellular fluid include electrolytes chemicals. The main cation and anion in extracellular fluid, respectively, are sodium and chloride.
Sodium is one of the most crucial electrolytes in the extracellular fluid because it is an active cation. It is in charge of regulating the cell's membrane potential, as well as maintaining the extracellular fluid volume.
All body tissues require the mineral potassium, which is a necessary component. Because it carries a little electrical charge that activates numerous cell and nerve activities, it is also referred to as an extracellular anion.
Therefore, electrolytes are classified as intracellular or extracellular.
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If an atom has an atomic number of 16, the number of electrons it would
have in its outer most shell would be
Answer: PHOSPHORUS
Explanation:
The term atomic number, conventionally denoted by the symbol Z, indicates number of protons present in the nucleus of an atom, which is also equal to the number of electrons in an uncharged atom. The number of neutrons is represented by the neutron number (N)
im new to this so i tried what i knew
the epigastric region is a portion of the cavity. multiple choice pelvic pleural vertebral abdominal
The epigastric region is a portion of the abdominal cavity.
The correct option is d.
The greatest hollow area in the body is the abdominal cavity. Its lower limit is the upper plane of the pelvic cavity, and its upper barrier is the diaphragm, a sheet of muscle and connective tissue that divides it from the chest cavity. The spinal column, as well as the abdomen and other muscles, encircle it vertically.
The epigastrium is the top portion of your abdomen that is immediately below your rib cage. The epigastrium houses your pancreas and the duodenum, a section of your small intestine. Additionally, your stomach and liver are partially located here.
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