Answer:
Germ cells are highly specialized cells that form gametes, and they are the only cells within an organism that contribute genes to offspring. Germline stem cells (GSCs) sustain gamete production, both oogenesis (egg production) and spermatogenesis (sperm production), in many organisms. Since the genetic information contained within germ cells is passed from generation to generation, the germ line is often referred to as immortal. Therefore, it is possible that germ cells possess unique strategies to protect and transmit the genetic information contained within them indefinitely. On the other hand, it was shown that germ cells are pluripotent in all stages of development. We and other groups succeeded in the long-term culture of spermatogonial stem cells (SSCs) of mice. The cells were phenotypically similar to the ES/embryonic germ cells except for their genomic imprinting pattern. They differentiated into various types of somatic cells in vitro under the conditions used to induce the differentiation of the ES cells, and the SSCs formed germline chimeras when injected into blastocysts. Furthermore, we have shown that somatic stem cells are able to differentiate to germ cells. Derivation of both male and female gametes in vitro raises the possibility of using these gametes to gain a better understanding of basic reproductive biology and, in particular, to extend the potential for therapeutic cloning, transgenic technologies and the treatment of infertility. We started three different approaches for establishment of the in vitro gametogenesis systems: 1) ES-derived gametogenesis, 2) derivation of germ cells from somatic stem cells and 3) in vitro gametogenesis based on cultured spermatogonial stem cells. We developed a strategy for the establishment of germline stem cell lines from embryonic stem cells. These cells are able to undergo meiosis, generate haploid male gametes in vitro and are functional, as shown by fertilization after intra-cytoplasmic injection into mouse oocytes. Molecular and cellular mechanisms underlying differentiation of ES to functional gametes should be elucidated in future research. In other approach, we show that bone marrow stem (BMS) cells are able to trans-differentiate into male germ cells. BMS
(EASY) Help help MEEE
Answer: your answer is correct A. fact one
Answer:
fact 1
Explanation:
What causes a mudflow?
Answer:
rain
Explanation:
my reasoning for this is because rain is just water and for mud you need water so if it flows it needs lots of water or rain but thats my reasoning might be wrong
Answer:
heavy rain or sudden thaw
Explanation:
This desert has not received rain for weeks. Now that a storm has arrived in the area, how will the environmental change most likely affect the stability of this ecosystem?
A.
The rain will cause the desert to maintain the same level of stability, as the rain will temporarily provide animals and plants with water.
B.
The rain will cause the desert to become more stable, as the rain will provide animals and plants with a single large reserve of water.
C.
The rain will cause the desert to become more unstable, as the rain will wash away all the nutrients from the soil before they are absorbed.
D.
The rain will cause the desert to become alternately stable and unstable, as the rain will be consumed by plants before it reaches animals.
A group of wolves is led by a male wolf and a female wolf. The two wolves lead the hunting and get to eat the captured prey first. They are the only wolves in the group who have pups. The other members of the group help to feed and care for the pups. The group works together to stop other wolves from entering the area where they live.
Identify the social structure and describe the social behaviors of the wolves. Explain how these behaviors help the wolves survive.
Answer:
Explanation:
The alpha male and his mate and a few others go hunting for food for the pack. Other has to stay and protect the pup and the area from others packs. So it teamwork 4-5 are hunting 5 or more defend their home.
Latitude and Longitude fill in the blanks
Answer:
lines
drawn
pole
west
prime
equator
north
Explanation:
It would be great if you would help me out. I need it as soon as possible.
A group of wolves is led by a male wolf and a female wolf. The two wolves lead the hunting and get to eat the captured prey first. They are the only wolves in the group who have pups. The other members of the group help to feed and care for the pups. The group works together to stop other wolves from entering the area where they live.
Identify the social structure and describe the social behaviors of the wolves. Explain how these behaviors help the wolves survive.
Answer:
The other members o the groups help them to survive by taking care of the pups.If it want for them maybe they would die.So the social or connection they have with them will help them to connect with them when they grow
The _______________ system removes wastes from the bloodstream that can cause toxic build up.
Explanation:
Your urinary system filters your blood to get rid of what your body doesn't need. It eliminates extra water and salt, toxins, and other waste products.
Answer:
I would say urinary system
Explanation:
Explain how you could use electricity from solar panels to get the electrical energy you need at any time.
Answer:you could put solar panels on top of your house.
Explanation:solar panels on top of your house is something that you need at any time
The Virginia Meadowsweet, a plant native to the wetlands of Georgia, is the primary food source for the larvae of the Spring Azure Butterfly. The Virginia Meadowsweet plant population is becoming endangered due to the clearing of the wetlands for farming and construction. Many environmentalists claim that this disturbance will affect other populations in the ecosystem.
Which argument BEST supports the environmentalists’ claim?
A.
As the Virginia Meadowsweet plant population decreases, the butterfly population will decrease because the larvae will not have enough food to sustain their current population.
B.
As the Virginia Meadowsweet plant population decreases, the butterfly population will increase because the larvae will not have enough food to sustain their current population.
C.
As the Virginia Meadowsweet plant population decreases, the butterfly population will increase because the butterflies’ predators are being killed off as more land is cleared.
D.
As the Virginia Meadowsweet plant population decreases, the butterfly population will decrease because the butterflies’ predators are being killed off as more land is cleared.
i already asked this but i really need it so: What are the benefits and drawbacks of using pesticides? (I would prefer 4 of each in point form, but if you cant do all that i completely understand)
Answer:
The benefits of using pesticides are that they try to minimize the amount of infestations by pests and thus protecting the crops from potential yield losses and reduction of product quality.
Limit the amount of infestationsProtecing the cropsHigh profits to farmersAffordable to consumersThe drawbacks of using pesticides are that there is evidence of both direct and indirect dangers involved in the use of these chemical substances both for humans and the environment.
Dangerous to humans, animals, and the enviormentContaminates the land, air, food, and waterShort-term and long-term damage to whatever it effectsIn some cases, effect the crop its suppose to help1.) what is one distinguishing feature of chordates? What are some examples of chordates?
2.) Do vertebrates have an endoskeleton or exoskeleton? What are some examples of vertebrates?
Answer:
2.) vertebrates have endoskeletons. some examples are...fish, birds, mammals, amphibians, and reptiles
Questions and Conclusion 1. If the egg is a model of Earth, what does each part of the egg represent? (Use the chart below.)
Portion of Egg Part of the Earth It Represents
Whole egg
Egg shell
Cracked pieces of egg shell
Egg white
Egg yolk
2. How does your model demonstrate the differences between the types of tectonic plates and the resulting observations in the asthenosphere?
3. How did your hypotheses of your Tectonic Egg Model compare to your experimental results?
4. What are some shortcomings of using this model as a replicable of the Earth? Suggest a way that a scientist could create a more accurate model of Earth’s tectonic plates.
Complete the sentence
Most healthy human cells have _______.
1) 22 chromosomes
2) 44 chromosomes
3) 23 chromosomes
4) 46 chromosomes
Answer:
The answer is 4, 46 chromosomes.
Explanation:
Human cells all have 23 pairs of chromosomes, which makes up 46 chromosomes altogether.
Answer:
option 4
Explanation:
Humans have 23 pairs of chromosomes, for a total of 46 chromosomes. In fact, each species of plants and animals has a set number of chromosomes.
The diagram below shows the branching tree diagram for humans. The text box below it shows the set of derived shared characteristics for the branching tree.
Look at the possible derived shared characteristics, shown in the text box. Think about where these should be placed along the branching tree diagram. From the text box, select a shared derived characteristic that humans and rats have. Explain why you think humans and rats share this characteristic.
Answer:
Rats and Humans both live on land during all life stages.
Explanation:
I think this because rats don't live in water or anything like that during their lifetimes. Humans also don't live in water during their lifetimes. So that is how I know that they share living on land during all life stages characteristic.
What is an advantage and disadvantage of OPEN ended questions?
Answer:
Permits an unlimited range of answers.
Reveals how the respondents think about the question.
Responses can be used to expand on and clarify closed responses.
Explanation:
Answer:
Advantages
It is easy to quantify and compare the results of surveys with closed questions
Disadvantages
Closed questions may not provide appropriate alternative responses.
Explanation:
Explanation:
Arrange the events to describe how an earthquake happens. Help pls, links and irrelevant answers will be getting reported.
Answer:
F= 1
C= 2
A= 3
D= 4
E= 5
B= 6
G= 7
Explanation:
Please help me with this
Answer:
response to stimuli
Explanation:
mark me as brainlist
1.) describe the amphibian life cycle. Include the different phases and traits of each phase.
2.) describe how baby reptiles are born and what they are like.
Answer:
1.) The Amphibian life cycle isn't as simple as it seems. The main Amphibian that has a longer process are called Frogs. Everyone knows frogs, but they are different from most animals such as turtles. The first stage of frogs are when their in eggs of course. These eggs are called "Tadpoles" and look different than most eggs. These eggs are kept in water until they grow. Which brings me to the next stage. When the tadpoles hatch you would start to see something like a baby fish swimming around. That's still the same tadpoles you saw before just hatched. When it comes to this topic most are confused because frogs don't have tails. Well during these stages a tail is used to help them survive in the water and move around. The third stage of these interesting creatures are when they grow legs. That's when they are able to walk on land. They still have their tail of course. It still helps them swim in water. I don't understand much about why they still have a tail if they've grown legs, but that's for me to find out soon. Eventually they grow more and more and get better with their legs and lose the tail. Well the tail doesn't just magically disappear. It's actually absorbed by using something called apoptosis. Then it's pretty much and adult frog.
2.) Most baby reptiles are grown in eggs. Another name for them would be "Amphibians". These little creatures are mostly kept in water or hidden underground for various reasons. Unlike turtles and lizards. Frog eggs are called "Tadpoles". They look like mini clear eyes. They also have a longer process than most animals which was explained in the first question!.
Explanation:
Hope this helped!
Astronomers use spectrographs to collect light waves from stars in order to study characteristics of stars. What information can astronomers determine by studying a star's spectrograph?
A-chemical composition, temperature, and density
B-temperature
C- chemical composition
D- density
Can someone please help me with this :/
Please help me with this
Answer:
Photo means light
Explanation:
Please help asap!
Figure 1 shows th
question for 6th graders only
which of the following is an example of a scientific experiment that is replicable?
Jenn is studying squirrel monkey behavior and records her observations about them while at the zoo.
Amelia is comparing how many sunflowers have grown this summer in her garden and her neighbor’s gardens.
Caroline is testing how well three different materials conduct electricity by measuring current.
Liz is investigating the rock cycle by researching the different types of rocks and soil in her area.
Answer:
amelia's experiment
Explanation:
Which of the following lists the components of a nucleotide?
a. a phosphate group, a deoxyribose, a nitrogen-containing base
b. a phosphate group, a ribose, a nitrogen-containing base
c. a nitrogen group, a ribose, a phosphate-containing base
d. a nitrogen group, a deoxyribose, a phosphate-containing base
Answer:
A
Explanation:
Already answered in duplicate question of yours
Components of a nucleotide are:-
A phosphate group, a deoxyribose, a nitrogen-containing base
The bases used in DNA are adenine (A), cytosine (C), guanine (G) and thymine (T). In RNA, the base uracil (U) takes the place of thymine.What is nucleotide?A nucleotide is one of the structural components, or building blocks, of DNA and RNA.Nucleotides in the form of metal ion complexes are involved in a variety of enzymatic reactions either as substrates or as cofactors.To know more about nucleotide here
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HELP PLEASE!!!
Fill in the blanks:
Plants are ________. They make their own food.
Animals are _________. They consume other organisms for food.
Answer:
plants are producers.
animals are consumers
Answer:
plants are producers.they make their own food.
animals are consumers.they consume other organisms for food.
hope this helps
plz mark me brainliest.
Which of the following correctly arranges the planets by the length of their year in increasing order?
A)Venus < Earth < Mars < Saturn
B)Saturn < Mars < Earth < Venus
C)Mercury < Mars < Earth < Neptune
D) Neptune < Earth < Mars < Mercury
(please only answer if you know for sure)
Some organisms have different common names in different parts of the world, but all organisms are given only one scientific name using binomial nomenclature. Which statement describes how the scientific name of an organism is written?
A. It is written in English.
B. It is written as genus and species.
C. It is written as kingdom and phylum.
D. It is written with quotation marks around it.
Answer:
the right option here is option C
The statement which describes how the scientific name of an organism is written is—It is written as genus and species. Therefore, the correct option is B.
What is a scientific name of an organism?Scientific names are the names that are given to a species of an organism, which is based on the binomial nomenclature given by Swedish botanist Carolus Linnaeus. These names are given by the taxonomists while naming an organism at the species level.
A scientific name comprises 2 parts: The first part is the genus name or the generic name, while the second part is the name of the species. A third part can also be added, where the name of the scientist who first discovered the species is written. Example- Homo sapiens refers to modern human beings. It is written in italics and in which the initial letter of the genus name is capitalized. Therefore, the correct option is B.
Learn more about scientific name of an organism, here:
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What are the two branches of biology?
Answer:
virology and microbiology
Describe the process that causes the plates of Earth crust to move.