Stem cells are the specialized cells of the body which have the potency to undergo division and form any other cell with specialized functions. These can be used in different therapies, for cell replacement.
What are Stem cells?Stem cells are the body's raw materials. These cells can divide and generate all other cells of the body with specialized functions. Under the right conditions in the body or a laboratory, stem cells divide to form more cells called daughter cells.
Stem cells have two unique properties that enable them to divide and replace the specialized cells. These can divide over and over again to produce new cells. As they divide, they can change into the other types of cells that make up the body.
In stem cell transplants, stem cells can replace the damaged cells by chemotherapy or disease or serve as a way for the donor's immune system to fight some types of cancer and other diseases, such as leukemia, lymphoma, neuroblastoma and multiple myeloma. These transplants can use adult stem cells or umbilical cord blood for replacement of cells.
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How does the age of seafloor sediments change with increasing distance from the ocean ridge?
tem cells are undifferentiated cells that have the ability to continue to grow and divide in their nonspecialized state for long periods of time (e.g., months or years).
Although the genes found within stem cells are the same, stem cells differentiate into unique cell types (e.g., muscle cells, nerve cells, etc.) due to
A)mutations in their genetic code.
B)different patterns in their gene expression.
C)meiotic division and fertilization.
D)random segregation and proliferation.
Correct answer: B). Different patterns in their gene expression.
The stem cell is a special type of cell that has the potential to develop into other types of cell. It has self-renewal property that can give rise to any type of cell of the body. Gene is expressed due to the specific combination of genes that turned off and on that regulate how the cell functions.
These cells start to divide in an asymmetrical manner in order to produce a large variety of cells with the unique gene expression, functional and morphological characteristics.
Hence, the correct answer would be option B.
What type of muscle tissue is found in the heart? Compare the distinguishing properties of this muscle to other muscle tissue types.
The heart consists of cardiac muscle tissue, which can contract on its own without nervous system stimulus, unlike other muscle tissues. Skeletal muscle, controlled by conscious decisions, moves the skeleton. On the other hand, smooth muscle is involuntary and is located in places such as digestive tract and blood vessels.
Explanation:The type of muscle tissue found in the heart is called cardiac muscle. It is unique and different from other muscle tissues in that it has the ability to contract on its own without nervous system initiation, a property known as automaticity or inherent rhythmicity.
Comparatively, skeletal muscle tissue is associated with the skeletal system. It is voluntary, meaning its contractions can be consciously controlled. And like cardiac muscle, skeletal muscle is striated, or has a banded appearance due to the organized arrangement of proteins within the muscle cell.
The third type of muscle tissue is smooth muscle. Unlike the other two, it lacks striations and its contractions are involuntary. This tissue type is found in places like the walls of blood vessels and the digestive tract where it helps to propel food along.
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Alexander was studying the affect of playing rock music on plant growth. One of the plants was exposed to rock music for 24 hours a day for a period of 6 weeks. Data on the growth of the plant was collected at the end of each week and plotted in a graph, time in weeks on the X-axis and height in decimeters on the Y-axis. Based on the data, which would be the MOST reasonable measurement at the end of a 8 week period?
A) 2 decimeters
B) 6 decimeters
C) 8 decimeters
D) 16 decimeters
Answer:
Option C.
Explanation:
If a line passes through two points [tex](x_1,y_1)[/tex] and [tex](x_2,y_2)[/tex], then the equation of line is
[tex]y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)[/tex]
From the given graph it is clear that the line passes through the point s(0,0) and (1,1). So, the equation of trend line is
[tex]y-0=\frac{1-0}{1-0}(x-0)[/tex]
[tex]y=x[/tex]
Substitute x=8 in the above equation to find the MOST reasonable measurement at the end of a 8 week period.
[tex]y=(8)[/tex]
[tex]y=8[/tex]
The MOST reasonable measurement at the end of a 8 week period is 8 decimeters.
Therefore, the correct option is C.
Illuminated objects are those that
A. reflect light.
B. absorb light.
C. produce light.
If only a mother has achondroplasia, what are the chances a child will also have the condition?
What does the term carrying capacity describe?
Question 15 options:
The maximum number of birth rates for a population.
The ability of a population to accept new immigrants.
The population size that the environment can sustain.
The ratio of birth rates to death rates in a population.
Answer: The population size that the environment can sustain.
Explanation:
The carrying capacity can be defined as the maximum number of individuals of the population of a species which an ecosystem can support and sustain in terms of availability of resources such as water, food, shelter and other needs. When the population of the species exceeds the carrying capacity of the ecosystem the population starts declining to maintain the number which a carrying capacity of the ecosystem can sustain. On the basis of the above information, The population size that the environment can sustain. is the correct option.
Over time, some plants growing in an area are crowded out by other plants. The new plants use up water and nutrients needed by the previous plants. The disappearance of the first plants is due to
Justify "Chemical reactions occur faster with the presence of enzymes as long as the conditions are ideal"
What is the function of the organelle identified as #6 in the picture (it is mostly brown, folded over, and is in the lower right part of the cell)?
D) Packages proteins for transport out of the cell
The Golgi apparatus modifies proteins and lipids that were synthesized in the endoplasmic reticulum (ER). This includes the addition of carbohydrate groups (glycosylation), phosphate groups (phosphorylation), and other modifications. It processes and sorts these molecules to prepare them for their final destinations.
The Golgi apparatus also sorts modified proteins and lipids and packages them into vesicles. These vesicles are then transported to their specific destinations within or outside the cell.
Complete Question:
What is the function of the organelle identified as #6 in the picture (it is mostly brown, folded over, and is in the lower right part of the cell)?
A) movement
B) houses the cells DNA
C) house the digestive enzyme
D) packages proteins for transport out of the cell
How do the animals in an ecosystem MAINLY acquire the sun’s energy? A) They absorb energy through their skins. B) They obtain energy when they drink water. C) They obtain energy trapped and stored by plants. D) They can convert the Sun’s energy into chemical energy.
Answer:
d is incorrect is c they obtain energy trapped and stored by plants.
as you drive along the roadside, you and your friend notice a dead deer that apparently was struck by a car. Your friend comments that she has never seen such a fat deer. "Did you see the size of its abdomen? It was huge!" As a student of forensics, how would you explain to your friend why the abdominal region of the dead deer was so large? CSI
Answer : The size of abdomen appeared to be huge because it stored stomach and many visceral organs.
When the dead deer was spotted by the person it appeared to be much bigger than usual because when the deer was hit by the car it remained there for several hours or may be days and nobody cleared that; From the sun's heat which was falling on the dead deer's body the internal organs were heated up, making them swelled and enlarged than their usual size.
In order for a human female to express a recessive sex-linked trait, she must have....
A) two recessive alleles
B) an inactive allele
C) a recessive allele on a Y chromosome
D) two recessive autosomal alleles
Most of the food and oxygen in the environment is produced by the action of
1. Saprophytic Bacteria
2. Heterotrophic Bacteria
3. Aerobic protozoans
4. Autotrophic organisms
The correct answer is (4) Autotrophic organism.
Green plants make their own food by the process of photosynthesis using sunlight. Most of the autotrophs use carbon dioxide, sunlight and carbon dioxide to produce glucose that is used by the plants to obtain energy. Most of the oxygen comes from these organisms and decrease in the number of green plants can lead to several problems due to decrease in the amount of oxygen. Example: green plants, algae, and even some bacteria. This food and oxygen is produced by the action of autotrophic organisms
what is equal to Velocity change per second
Answer:
Acceleration
Explanation:
The rate of change of velocity is known as acceleration. Acceleration is the rate of increase/decrease in motion, action or speed
Suppose the initial speed of any object is [tex]v_0[/tex] and the final speed of any object is [tex]v_f[/tex] and the object changes this speed in a time period of [tex]t[/tex] seconds, then the mathematical formula for acceleration would be
[tex]a= \frac{v_f-v_0}{t}[/tex]
where, "a" is the acceleration
The unit of acceleration if meter per second square.
Which scientist’s law about the ratios of masses of elements in a compound did John Dalton’s work on the atomic structure help to explain?
Democritus
J. J. Thomson
Ernest Rutherford
Joseph Proust
the correct answwer to this question is D Joseph Proust
1. Which of the following is NOT a true statement about ATP?
A. ATP consists of ribose, adenine, and three phosphate groups.
B. ADP is produced when ATP releases energy.
C. ATP provides energy for the mechanical functions of cells.
D. Used ATP is discarded by the cell as waste.
Sediment composition in a clastic rock is determined by all of the following EXCEPT:
A. Source rock crystals
B. Transport agent
C. Source rock composition
D. The type of plant that grew near a river
Sascha notices that steam appears from water only when the water is very hot. What property of water explains this observation?
Water has a high vapor pressure.
Water is densest as a liquid.
Water has a low boiling point.
Water has a high heat capacity.
The answer is definately that water has a high heat capacity
5. Why are ecological pyramids shaped as pyramids? (1 point)
because there is a large decrease in the amount of energy or biomass as you move from one trophic level up to the next
because the movement of energy through the biosphere follows a path similar in shape to a pyramid
because decomposers form a wide base of support at the bottom of a food web similar to the base of a pyramid
because a pyramid represents a stable building form that is similar to the structure of a stable ecosystem
6. What is true of matter in ecosystems? (1 point)
Nonliving things are essential for carrying out the chemical transformation of certain elements so that living things can use them.
Living things can recycle elements within an ecosystem as long as decomposers are present.
Matter flows in a one-way direction with a 10% loss at each move up in trophic level.
Elements continuously cycle between the physical environment and living organisms.
7. Which of the following is a food chain in the food web shown in Figure 3–4?
(1 point)
tree, rabbit, hawk, snake
grass, grasshopper, snake, hawk
grass, caterpillar, robin, hawk
tree, deer, mountain lion, fox
Organisms from the higher trophic levels consume organisms from the lower trophic levels. During this process, energy is lost as metabolic heat. Primary producers on the first trophic level contain the greatest amount of energy originally from the sunlight. The next trophic level belongs to primary consumers that consume primary producers which result in less energy. Similarly, secondary consumers eat primary consumers, and energy is lost again. The highest trophic level is tertiary consumers and they contain the least amount of energy.
Q6. The answer is Elements continuously cycle between the physical environment and living organisms.
Biogeochemical cycles are pathways by which chemical substances move through biosphere and geosphere (lithosphere), as well as atmosphere and hydrosphere. In these cycles elements are recycled, they are not lost. They continuously cycle between the physical environment and living organisms.
Q7. The answer is grass, grasshopper, snake, hawk.
Figure 3-4 is not attached, however, the logic food web among all choices wood be: grass, grasshopper, snake, hawk.
Grass belong to the producents. Grasshopper is a primary consumer and it eats producent grass. Snake, as a secondary consumer, eats the primary consumer grasshopper. A terciary consumer hawk eats the secondary consumer snake.
Which organism's are omnivores?
A) The snake, the bear, and the fish
B) The fish and the eagle
C) The bear and the fish
D) The snake and the mouse
If an omnivore is an animal that eats both plants and animals, I'd choose D because all the other options have fish in them. Fish basically eat other fishes right?
Or am I wrong in my thinking?
Answer:
Its C) because bears are omnivores they eat plants and animals a bear eats berrys and fishes.
Explanation:
which of the following ecosystem factors is considered biotic?
a.temperature range
b.predator
c.mineral types
d.water chemistry
In an ecosystem, a predator is considered a biotic factor, as it is a living organism that impacts other organisms in its environment. While temperature range, mineral types, and water chemistry are important, they are abiotic (non-living) factors.
Explanation:In an ecosystem, factors can be either biotic (living) or abiotic (non-living). Out of the options given, predator is considered a biotic factor. Biotic factors are all the living organisms that inhabit an environment, including animals, plants, fungi, and bacteria. A predator is an example of a biotic factor because it is a living organism that impacts other organisms in the ecosystem through predation.
Other options like temperature range, mineral types, and water chemistry are considered abiotic factors because they are non-living factors that also play a major role in the ecosystem.
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Meiosis is different from the process shown because, during meiosis,
A) chromosomes are not replicated.
B) two gametes are made for every original cell.
C) four gametes are produced for every original cell.
D) four somatic cells are produced for every original cell.
Answer: The correct option is -
C) Four gametes are produced for every original cell.
Explanation:
Meiosis is a type of cell division that occurs during the process of formation of gamete ( that are haploid, reproductive cells such as eggs and sperms) particularly in case of organisms that perform sexual reproduction.
During this process, a diploid parent cell produces four haploid cells (gametes or sex cells) through two rounds of cell division ( that are meiosis I and meiosis II).
This is also known as reductional cell division. Thus, four gametes are produced for every original cell.
Therefore, option C) is the right answer.
Why is it that two species cannot occupy the same niche for an extended period of time?
Answer:
In terms of ecology a niche can be defined as role or function an organisms play within the ecosystem. A niche represent the interaction of an organism with the living and non living components of the ecosystem. It is represented by predator-prey relationships, parasitic and mutualistic properties and other functions. The two species cannot occupy the same niche for an extended period of time, this can be explained by competitive exclusion principle. According to this principle, no two species can have the same ecological niche. The two or more species competing for the same resource in an ecosystem the one species having more favorable adaptations will be able to thrive resources better than others. Therefore, this will result in the decrease in abundance, migration and extinction of weak and less competitive species.
A(n)___ is a group of simalar cells that perform a specific function in an organism
what are the types of unconformities that can occur in rock layers? a. angular b. disconformity c. nonconformity d. all of the above
how do electrons gain energy in photosystem 1?
a. They absorb photons.
b. They use energy in the form of glucose.
c. They take energy from ATP molecules.
d. They use energy from a hydrogen ion pump.
Electrons in photosystem I gain energy by absorbing photons, which excites the electrons from splitting water, later used to form ATP and NADPH.
Explanation:Electrons gain energy in photosystem I when they absorb photons. The chlorophyll molecules in the photosystem absorb light and become excited. This energy is then used to excite electrons, which are transferred to the primary electron acceptor. The energized electrons come from the splitting of water, a process that occurs in photosystem II and is aided by the light energy captured by chlorophyll a molecules.
Once excited, the electrons travel through the electron transport chain, contributing to the generation of a proton gradient that leads to the synthesis of ATP in chemiosmosis. Then, absorbing a second photon in photosystem I results in the formation of NADPH molecule, another energy carrier important for the light-independent reactions such as the Calvin cycle.
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Perfect flowers have both male and female parts. The male part is called the _____ and the female part is called the _____.
How long did it take for the population to double a third time?
Do the trees in your area have much chlorophyll in them right now? Do you think the trees in your area will have more or less chlorophyll in three months than they did now?
Answer:
The trees in my area do have much chlorophyll, and are starting to turn more green now that the winter has passed. This is because it's currently spring. During this time there's more sunlight and many trees, along with enough glucose to sustain them. Now, photosynthesis is taking place, and trees are reproducing. So yes, I do think that in 3 months it'll be summer, and there will be even more sunlight and chloroplast in the trees.
Explanation:
Isn't it funny that now you have an answer if it's fall or spring where you live?
Don't write the exact same thing because I just gave this to my teacher in a-p-e-x in march 2021. So please, our teachers are smart.
Hope this helps! :D