Answer:
Stem cell research is a controversial subject because they are human embryonic stem cell (hESC), and obtaining stem cells involves the destruction of human embryos
Explanation:
The inner cell mass of a 5 to 7-day-old blastocyst can be used to generate pluripotent stem cell lines. Human embryonic stem cell investigation, on the other hand, is morally and politically fraught since it encompasses the killing of human embryos.
What are stem cells?Stem cells are the primary raw material of the body, the cells that give rise to every other cells with specialized functions.
Under the right circumstances, stem cells differentiate to form the most cells known as daughter cells in the body or in a research lab.
Stem cells are mostly found in bone marrow. This is how they divide in order to produce new blood cells.
Once mature, blood cells end up leaving the bone marrow and reach the bloodstream. A small number of immature stem cells enter the bloodstream.
Bone Marrow has long been thought to be the best source of stem cells.
Previously, if a patient required a stem cell transplant but didn't have access to umbilical cord blood stem cells, they earned a bone marrow transplant.
Thus, this is the reason to have stem cell research as a controversial subject.
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A student finds that the mass of 25mL of an unknown liquid is 20.5g. What is the density of this substance?
Answer:
Density, [tex]d=0.82\ g/cm^3[/tex]
Explanation:
It is given that,
Mass of unknown liquid is 20.5 kg
Volume, V = 25 mL
We know that, 1 mL = 1 cm³
25 mL = 25 cm³
The density of the substance is equal to its mass per unit volume. So,
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{20.5\ g}{25\ cm^3}\\\\d=0.82\ g/cm^3[/tex]
So, the density of this substance is [tex]0.82\ g/cm^3[/tex].
Answer:
0.82
Explanation:
just took test
Which of the following is a testable hypothesis?
a. Roses are more beautiful than violets.
b. A plant needs at least five hours of sunlight per day to grow.
c. I've cream is delicious.
d. Humans will someday land on Mars.
Answer:
D. Humans will someday be on mars
A child is born without a fully developed heart. He is normal in all other respects, and thus doctors believe that the problem most likely began early in development. During the formation of which embryonic germ layer did the original error most likely occur
Why was the scientific method developed?
Group of answer choices
to help scientists avoid religious disputes
to help scientists organize the process of solving problems
to confirm ancient facts about the Earth
to develop scientific laws that no one could argue with
Answer:
Its B
Explanation:
It just is
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ang Chlorophy
1. Which cell types remain in a non dividing stars and do not comes the trials
process?
-cles of Cells
A muscle cells and nerve cells
B skin cells and muscle cells
cles of Cells
C muscle cells and skin cells
D liver cells and nerve cells
Answer:
A. Muscle and Nerve cells
Explanation:
These two kinds of cells remain in a non-dividing state. The rest of these cell types multiply/divide.
please help asap
Which statement describes the damage that results from earthquakes?
A: Amount of damage can be used to determine intensity.
B: Damage can be measured using the Richter scale.
C: The amount of damage increases as magnitude decreases.
D: Earthquakes that cause maximum damage are the most common.
Answer:
option c is correct
Explanation:
The statement that describes result from the activities of Earthquake is C: : The amount of damage increases as magnitude decreases.
An earthquake can be regarded as outcome of release of stored energy , which is released suddenly into the Earth's crust and as a result of this seismic waves is created.Earthquake do occur by displacement of the ground or by shaking the Earth's surface, Some of other results of earthquakes are;damage to bridgescause tsunamisinitiation of slope failuresloss of life However, as the earthquake is in action and as the damages increase, then there would be a decrease in it's magnitude.Therefore, option C is right because as its magnitude decrease, then the damage will increase.
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what are the problems and the challenges in classifying living things
Answer:
the problems are that there are so many different species that they aren't easy to classify.
ASAP What occurs after the homologous pairs are separated?
A. The sister chromatids separate.
B. Spindle fibers attach to the chromosomes.
C. Haploid cells are formed.
D. The nuclear envelope reforms.
Answer:
A
Explanation:
the sister chromatids separate
After the separation of homologous pairs, the sister chromatids are subsequently separated during meiosis II.
What is Homologous pair?Homologous pairs may be defined as those chromosomes which are very identical to one another and have the same size and shape.
In meiosis I, the separation of homologous pairs occurred. After this process, the sister chromatids are separated in meiosis II.
This separation leads to the production of a total of four products having the half number the chromosomes as compared to the original cell.
Therefore, the correct option for this question is A.
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Which of the following is an example of a natural selection?
1 point
All grey squirrels have not changed for a 1,000 years
Birds developed wings because they wanted to fly.
Fish developed gills because they wanted to move to land.
A new species of purple squirrels forms due to a change in the ecosystem.
Answer:
A new species of purple squirrels forms due to change in the ecosystem
Explanation:
Key part: Change in the ecosystem
You collect a specimen from a deep jungle survey. It appears to be a new species. You
get to name it, but before you can, you must classify it first. It appears to be single celled,
and contains chloroplasts. When a few of them are kept in the dark too long, they die.
Under the microscope you can see a dark colored nucleus. What classification fits them
best?
O A. Archaeabacteria
B. Fungus
C. Plant
OD. Plant-like protist
Answer:
The correct option is;
D. Plant-like protist
Explanation:
Protists are a broad collection of not so strictly connected microscopic unicellular (single celled) eukaryotic organisms that is neither a fungus, plant, or an animal but are categorized under the kingdom known as Protista
Protophyta is a known plant-like protist that is made of single celled algae
Other single-celled chloroplast containing protists are diatoms, and dinoflgelates.
Some villagers plan to remove the trees from this hillside.
Doing this could damage their environment.
a ) Suggest one immediate problem for the animals that live on the hill.
b ) Suggest one problem that could arise during the rainy season.
Answer:
1) Deforestation has real consequences for animals. The most serious impacts of deforestation on animals are listed below. #1 Habitat loss Deforestation can lead to a direct loss of wildlife habitat as well as a general degradation of their habitat.
2)When there is less soil stability because of the disadvantage of erosion, the risk of a flooding event occurring during the rainy season increases dramatically. Poor water absorption levels make it easier for higher accumulation levels since the trees are no longer present to take up the extra moisture.
Explanation:
Briefly explain how sexual reproduction generates new allele combinations in offspring.
Which of these characteristics is shared by all living things?
A. They have similar responses to light
O B. They are made up of one or more cells
C. They reproduce when one cell divides into two
D. They make their own chemical energy from the sun
Answer:
They are made up of one or more cells
Explanation:
Because an organism is made up by one or more cells
what is the function of cilia in respiratory system.
Answer: Movement.
Explanation: Cilia work the same way as flagella. They enable the cells to move because of their shape (tiny little hairs).
Answer:
'Motile' (or moving) cilia are found in the lungs, respiratory tract and middle ear. These cilia have a rhythmic waving or beating motion. They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation. They also help propel sperm.
Explanation:
which best describes bacterium?
Answer:
Bacteria (singular: bacterium) are classified as prokaryotes, which are single-celled organisms with a simple internal structure that lacks a nucleus, and contains DNA that either floats freely in a twisted, thread-like mass called the nucleoid, or in separate, circular pieces called plasmids. Hope this helps :))
Explanation:
Answer:
Bacteria are classified as prokaryotes, which are single-celled organisms with a simple internal structure that lacks a nucleus, and contains DNA that either floats freely in a twisted, thread-like mass called the nucleoid, or in separate, circular pieces called plasmids.
Explanation:
Dose anyone know the answer
Answer:
Anthracite is the answerA group is considered monophyletic if
A. all members of the group share a common ancestor that is included in the group.
B. all members share homoplastic traits.
C. the group does not contain the most recent common ancestor.
D. not all descendants of the common ancestor are included.
E. it is the most parsimonious grouping.
What is an example of medicines whose molecular structure has been designed to interact with specific target molecules in living things?
Answer: G protein- coupled receptor
Explanation:
Drug target is when a native protein activity in the body is modified by a drug resulting in a desired therapeutic effect.
G protein is an example of target drug that has been deisgned to modified the affect of certain protein in the body to aid treatment.
The first thing is to Identify the biological origin of the disease and then the target that can be used to combat the Ailment.
Bile juice dose not contain any digestive enzymes yet it is essential for digestion why so ?explain
Explanation:
Although bile juice does not contain any enzymes, it contains bilirubin and biliverdin. These help to break big fat globules into small globules which is taken to pancreatic juices to be further digested. This is known as emulsification of fat. It also helps in secretion of lipase. Thus it plays an important role because majority of the fat digestion process is carried out by it.
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Which plant cells might not contain any chloroplasts?
Answer:
roots
Explanation:
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Please help!
A. I only
B. II only
C. III only
D. I and III only
Answer:
a
Explanation:
my reason is that the capacity carrying is 35
Answer:
[tex]\boxed{\mathrm{A. \: I \ only}}[/tex]
Explanation:
The graph does not mention any seasons. The graph is not growing geometrically. For about 9 months the population has been about 35.
three parts of stamen
Answer:
three parts of stamen are:
anther
filament
connective .
What is The mutation caused by the addition of a nucleotide to an already existing gene sequence called? A. deletion B.duplication C.insertion D. Inversion ??
Answer:
Insertion
Explanation:
An example of this genetic disorder is the trisomy 21
difference between diabetes mellitus and diuresis?? please help
Explanation:
If you have been in EMS long enough, you may well have encountered a patient with diabetes insipidus. Like many, you may have assumed that it is a variant of the common disease diabetes mellitus. Actually, diabetes mellitus and diabetes insipidus are totally unrelated other than the name. The term diabetes is derived from Latin (originally Greek) and means “to go through or siphon,” referring to a large amount of urine produced by the kidneys. The term melitus, in Latin, means “sweet.”
Please write down prearation of perment slides of pollen grains by acetolysis method and study of different pollen characters: study of variation pattern in different taxa.
Answer is given below
Explanation:
Collection and preservation of pollen material: In clean glass pots containing 70% glacial acetic acid, some of the stamens are applied with clean forceps prior to flower synthesis and sometimes protected from diamonds or mature flower buds. Some polyologists recommend 70% ethyl alcohol to preserve feathers in place of glacial acetic acid. In this condition, pollen-filled feathers can be stored indefinitely. The wings are transferred to a centrifuge tube and rinsed well with distilled water.the wings are crushed with a glass rod and the mixture is filtered through a cheesecloth or sieve. The lower part is recalled in the centrifuge tube. A freshly prepared acetolysis mixture containing acetic anhydride and concentrated H2SO4 (sulfuric acid) in a ratio of 9: 1 is poured into a centrifuge tube containing the washed pollen. Care must be taken to connect the conceider. H2SO4 by acetic anhydride drop to prevent overheating. The acetolysis solution reacts violently with water. Glacial acetic acid washers are required to replace water with acetic acid, which does not react violently with the acetolysis solution. Although the acetolysis process varies from pathologist to pulmonologist, the following approach seems to be the most appropriate. From the first to the last acetic acid wash, care is taken regardless of the water solution. Only distilled water should be used for washing to prevent contamination.what is the rate of person blood in one day
Answer:
about 6,000-7,500 liters (1,500-2,000 gallons) of blood daily.
Answer: mark me as a brainlist plz plz plz i really need this
Explanation:
Normal blood in human body
Adults: The average adult weighing 150 to 180 pounds should have about 1.2 to 1.5 gallons of blood in their body. This is about 4,500 to 5,700 mL. Pregnant women: To support their growing babies, pregnant women usually have anywhere from 30 to 50 percent more blood volume than women who are not pregnant
Which of the following is an autotroph?
A. A consumer
B. A prey
C. A predator
D. A producer
Answer:
D) producer
Explanation:
An autotroph, or main producer, is a living creature that uses carbon from basic molecules like carbon dioxide to build complex organic compounds, usually with the help of light or inorganic chemical processes.
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what does Ecology mean
Answer:
a branch of science concerned with the relationships between living things and their environment or the pattern of relationships between living things and their environment.
Explanation:
Which statement below correctly describes what the model shows? *
1
Answer:
I reckon it's part D.
Explanation:
The pronghorn antelope resides in temperature grassland biomes of North America. Their primary predators in this region are wolves, coyotes, cougars, and bobcats. The reason pronghorn antelope are not found outside of North America is most likely that Group of answer choices
Answer:
The options are
A) there are too many pronghorn predators outside North America.
B) its temperature requirements are stringent and not met outside North America.
C) it is a relatively new species in evolutionary terms.
D) its nutritional requirements cannot be met outside this region.
E) it has never dispersed beyond this region.
The answer is E) it has never dispersed beyond this region.
The pronghorn antelope resides in temperature grassland biomes of North America. The reason pronghorn antelope are not found outside of North America is most likely that it has never dispersed beyond this region which could be due to the suitability of the environment to their survival.