Answer:
sister chromatids are pulled toward the same pole of the cell.
Explanation:
Meiosis can be defined as process where a single cell is divided twice in order to produce four cells( i.e sex cells which are; Sperm and Eggs) which contains half the original amount of genetic information.
Meiosis can be divided into nine different stages. when the cell divide for first time is referred to as *meiosis I* and the second time it divides it's referred to as meiosis II.
During Meiosis The cell divide twice to form four daughter cells, the daughter cells contains half the number of chromosomes of the parent cell( haploid).Our sex cell is produced by Meiosis.
During meiosis I, the two kinetochores of sister chromatids fuse and kinetochore microtubules from one pole of the cell attach to the fused kinetochore. This is important because it ensures that during anaphase I
While doing field research, two scientists discover
a new species of plant. They take the plant back to
their lab to watch how it grows and reproduces.
Soon, the plant begins to produce a small purple
flower. Upon further investigation, the scientists
discover that the plant's seeds contain two
embryonic leaves.
Which group could the plant belong to? Check all
that apply.
bryophytes
pteridophytes
gymnosperms
angiosperms
monocots
dicots
Angiosperms, dicots
Explanation:
Angiosperms are highly differentiated vascular plants which can produce flowers and bear fruits with seeds in them. These flowering plants undergo reproduction and produces new plants. The reproductive parts like ovules and ovaries, stigma, stamen, pollen are all present in the flowers.
Angiosperms can either be a monocot or dicot. If they contain two embryonic leaves or cotyledons they are referred as dicots. Flowering angiosperms like geranium, magnolias are all dicots.
Geranium is a dicot angiosperms that produces small purple flowers.
Gymnosperms or bryophytes do not bear flowers or fruits. Monocots have only embryonic leaf.
Answer:
the answer is D- Angiosperms and F- Dicots
Explanation:
All of the following are examples of surface water except...
A) aquifers
B) streams
C) lakes
D) rivers
Answer: A.) aquifers
Explanation: all the rest are visible from the surface
Prolactin stimulates mammary gland growth and development in mammals and regulates salt and water balance in freshwater fish. Many scientists think that its wide range of functions among many organisms indicates that prolactin:____________.
Explanation:
Prolactin is a hormone that primarily promotes lactation (breast milk production) in mammalsIt is also responsible for a number of other functions and systems, for example it regulates behavior, the immune system, metabolism, reproductive systems, and many different bodily fluidsAll this makes it a crucial hormone for overall health and well-being, for both men and womenThe principal action of prolactin in fishes is freshwater osmoregulation, although it has also been implicated in reproduction, behavior, growth, and immunoregulationBecause of this wide range of functions, prolactin is considered an evolutionary conserved hormone
Prolactin is a pituitary hormone essential for milk production in mammals and has varied functions in different organisms, indicating its evolutionary role as a multi-functional regulator. In humans, it is involved in a positive feedback loop that stimulates milk production during lactation.
Explanation:Prolactin is a pituitary hormone that plays a crucial role in the establishment and maintenance of breast milk production but also exhibits a wide range of functions across different species. For instance, it regulates salt and water balance in freshwater fish and stimulates mammary gland growth and development in mammals. This hormone's diverse roles suggest that prolactin has evolved to perform multiple regulatory functions in various organisms. In humans, during lactation, the positive feedback loop involving the nipples' stimulation leads to prolactin secretion from the anterior pituitary, which in turn triggers milk production. This process is supported by other hormones such as oxytocin, which facilitates the milk let-down reflex, and is balanced by prolactin-inhibiting hormone, known as dopamine.
Random genetic changes to a species can result in no observable changes in the species. However, if the specific genetic change becomes great enough, a species can produce a new genetic branch. This event is called:
Answer: This event is called a genetic mutation
Explanation:
This can be explained when the genetic make up of a species is altered such that a new genetic branch is formed,a information is contained in the DNA leading to a visible change outwardly.
A chemist looking to enhance parenteral nutrition attempts to create amino acids and sugars in the lab that are produced naturally in the body. he finds that his workups consistently produce racemic mixtures of the amino acids that the body normally synthesizes and uses in only a single enantiomeric form. the most likely reason for this distinction is that:
Explanation:
The most likely reason for the given type of distinction is that the enzymes the body uses are typically stereospecific and only produce one enantiomer
Many of the enzymes used in the body are stereospecific - they will only react with one particular stereoisomer form of a molecule and will only catalyze a reaction that produces a particular isomer of the product
Often drugs are administered as a racemic mixture because work in the lab produces such a mixture even though only one of the isomers has any biological effect
Scientists have discovered by looking at fossil records that the ancestors of flying squirrels did not have flight membranes and are very similar to tree squirrels today. Make a hypothesis about how flight membranes evolved in flying squirrels through the process of natural selection.
they use natural selection because they got separated from their kind and have to make new living also they need to adapt to the environment
If you open a can of chicken noodle soup and immediately examine it microscopically, you will find no microorganisms. If you let the open can sit on the shelf for a few weeks and then examine it, you will find lots of microorganisms. The origin of these microorganisms is most likely:
Answer:
Airborne microorganisms
What statement is true regarding the nervous and endocrine systems?
Answer:
Endocrine signaling is generally slower than neural signaling.
Explanation:
Which of these choices is a goal of the National Park Service
Organic Act?
A. To establish air-quality standards and regulate
emissions of air pollutants
B. To limit the carbon emissions of fossil fuel power
plants
C. To preserve the natural ecology and history of
certain scenic places
D. To assess the conservation of soil and water
resources on private lands
Answer: To preserve the natural ecology and history of certain scenic places
Explanation:
I just took it
The goal of the National Park Service Organic Act is to preserve the natural ecology and history of certain scenic places. The correct option is C.
What is National Park Service Organic Act?The National Park Service Organic Act is a federal law passed by the United States Congress in 1916 that established the National Park Service and provided for the preservation and protection of the national parks' natural and cultural resources.
The act established the National Park Service and provided for the preservation of historic landmarks, prehistoric structures, and other objects of national significance.
It was passed by the United States Congress in 1916. The act also requires the National Park Service to "conserve the scenery, natural and historic objects, and wild life therein.
Also, to provide for the enjoyment of the same in such a manner and by such means as will leave them unimpaired for the enjoyment of future generations."
Thus, the correct option is C.
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The myelin on myelinated neurons can be degraded or destroyed in diseases such as multiple sclerosis-a process called demyelination. If a myelinated neuron was affected by demyelination, how would this affect action potentials in that neuron?
Answer:
The speed of action potential propagation get slower downExplanation:
Myelination is the process of generating myelin in neurons. In CNS, oligodendrocyte make the myelin sheath.
The main function of myelin is to increase the speed of electrical impulses along the myelinated fiber.
Myelinated fibers lack voltage-gated sodium channels along the myelinated internodes, having them only at the nodes of Ranvier though which the molecules moves.
Demyelination is the loss of the myelin sheath, result due to some neurodegenerative autoimmune diseases, resulting in the decrease of the speed of action potential propagation.
Final answer:
Demyelination of a myelinated neuron slows down the conduction of action potentials by causing current leaks. The myelin sheath acts as an insulator, increasing the speed of conduction. Nodes of Ranvier play a crucial role in regenerating the action potential.
Explanation:
Demyelination of a myelinated neuron will affect action potentials in that neuron by slowing down the conduction of the action potential. The myelin sheath acts as an insulator and prevents current from leaving the axon, which increases the speed of action potential conduction. When the myelin is degraded or destroyed, current can leak from previously insulated axon areas, causing a decrease in the speed of action potential conduction. The gaps in the myelin sheath, called nodes of Ranvier, play a crucial role in regenerating the action potential. Without these nodes, the action potential would propagate very slowly.
Following vaginal birth, a neonate has a large area of diffuse swelling over the left occiput that crosses the sagittal suture line. When discussing this finding with the neonate's parents, which statements by a nurse are accurate?
Select All
1. "No treatment will be required to resolve swelling."
2. "Due to the swelling, hyperbilirubinemia may occur."
3. "The swelling lies above the periosteum that covers the skull bone."
4. "Pressure on the fetal head before delivery caused the swelling."
5. "Your infant has a collection of blood under the skull bone."
Answer: Option 1 ,3 and option 4
Explanation:
The new born child or neonate has swelling in the left occiput that crrosses the sagittal surture line requires no treatment.
But there is no need for being tensed as parents and there is no need for the treatment because the swelling lies there because of the pressure on the fetal head that is caused due to delivery.
There is no need of medication it will be normal after sometime and due to this swelling hyperbilirubinemia may also occur which is normal and will be okay after the swelling is gone.
E. coli can synthesize the amino acid threonine or absorb it from the environment. In the thr operon, the repressor is active when it is bound to threonine. If an E. coli bacterium is in an environment where threonine is absent, will transcription of threonine synthesis genes take place? Why or why not?
Answer:
Yes, the synthesis of threonine occurs because threonine will not be bound to the repressor, so in unbound state, the repressor will be inactive.Explanation:
1. If an E. coli bacterium is grown, in an environment where threonine is absent, transcription of threonine synthesis genes take place, because threonine will not be bound to the repressor, so the repressor will be inactive.
2. When the repressor is bound to the threonine, it becomes active, and in the absence of threonine , repressor become inactive because there is no threonine to bind with repressor.
3. So, in the absence of threonine , there is synthesis of threonine occurs.
In an environment where threonine is absent, transcription of threonine synthesis genes will take place in E. coli.
Explanation:In the third operon, the repressor is active when it is bound to threonine. If an E. coli bacterium is in an environment where threonine is absent, transcription of threonine synthesis genes will take place.
The repressor protein in the third operon actively binds to the operator to keep the genes turned off. When threonine is absent, the repressor does not bind to the operator, allowing transcription to occur. This results in the synthesis of the amino acid threonine.
Overall, the transcription of threonine synthesis genes in E. coli is dependent on the presence or absence of threonine in the environment. If threonine is absent, the genes will be transcribed and threonine will be synthesized.
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4 characteristics of plants
The four characteristics of plants are photosynthesis, cuticle, cell walls, and reproduction.
Which type of feeding best suits a stationary organism
Answer:
Photosynthesis
Explanation:
Stationary organisms are plants. Plants obtain food through photosynthesis by converting sunlight, water and carbon dioxide into sugars.
what are at least 2 roles of paleontologists
Answer:
determines location of fossils.
excavates layers of sedimentary rock to locate fossils.
gathers information on the fossils (age, location, etc)
uses specific tools to excavate (chisels, drills, picks, shovels, brushes)
evaluates any discoveries by using specialized computer programs.
hope this helps!
agents of seed dispersal
Answer:
wind, water, animals, explosion and fire are the agents of seed dispersal.
Hope it will help you.Although trees like this one begin life as a seed, throughout growth and development the cells of the organism continually change. As a mature tree, several layers of cells in the secondary xylem or wood of the trunk are
Answer:
they are called secondary pholem.
Explanation:
As a mature tree, several layers of cells in the secondary xylem or wood of the trunk are no longer alive.
What are the layers of bark?The cells in the outermost layer, the bark, are still living and responsible for protecting the tree from damage and maintaining water balance. The cells in the inner layers of the bark, the cambium and phloem, are also alive and responsible for transporting water and nutrients throughout the tree. The cells in the heartwood, which is located in the center of the trunk, are no longer alive and provide structural support for the tree.
As trees grow, they add new layers of cells to their trunks, branches, and roots. These cells are formed through cell division in the cambium, a layer of actively dividing cells located just beneath the bark. As the tree grows, the cells in the cambium differentiate into different types of cells, including xylem cells, which transport water and minerals from the roots to the leaves, and phloem cells, which transport sugars and other organic compounds from the leaves to the rest of the tree.
The secondary xylem, or wood, is formed from the xylem cells and is responsible for providing structural support to the tree. The bark, cambium, and phloem are all vital to the tree's overall health and function. The bark protects the tree from damage and helps to regulate water balance, while the cambium and phloem are responsible for transporting water and nutrients throughout the tree.
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DO YOUR CELLS HAVE ANYTHING IN COMMON
WITH PLANT CELLS?
Answer:
Explanation:
Yes. They both have a cell membrane. They have many organelles that animal cells have and a cell membrane is one of the few similarities.
Answer:
Yes
Explanation:
Both cells have cell membranes, both have nucleuses and nucleolus, both have cytoplasm, both have mitochondria, etc. Hope that answers your question.
blood has traveled from the heart to the toes. which describes the next step of the circulation process? PLEASE EXPLAIN WHY WITH FACTS PLEASE
A the blood releases carbon-dioxide on the way back to the heart.
B the blood travels back to the heart in a vein
C the blood goes through the liver to be cleaned
D the blood travels to the lungs to get oxygen
Answer:
B. The Blood Travels Back to the Heart In a Vein
The blood has traveled from the heart to the toes, the next step of the circulation process is the blood travels back to the heart in a vein.
What makes blood circulate in the body?The bloodstream is responsible for transporting oxygen and nutrients between all the cells in an organism. During the process, it cleanses the tissues of the remains of cellular activities, such as the CO² developed during cellular respiration, in addition to driving hormones throughout the body.
Circulation is the mechanism by which blood is distributed throughout the body with the help of the heart, arteries, veins and capillaries.
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If you made an artwork to send a message to your
comunity, what could your message be?
Answer:
If I was to send a message right now during the corona virus to my community, I would say to be thankful and stay healthy because death will never wait for anyone.
Explanation:
if my ans helped u, pls mark it as brainliest! thx!
Answer:
2.2.4 Journal
Explanation:
Approximately how long has the victim been dead if his body temperature was 60.0°F?
Answer:
around 8 or 9 or 10 hours.
Explanation:
Answer:
14 or 15 hours
Explanation:
The equation for approximating temperature after death is
37.5°C - 1.5°C * hours = temperature
37.5 is the standard body temperature in degrees Celsius.60°F = 15.56°C
Plug this Celsius value into our equation.37.5° - 1.5°(hours) = 15.56°C
Let's solve for hours.-1.5*hours = 15.56 - 37.5°C
-1.5*hours = -21.94°C
1.5*hours = 21.94°C
hours = 21.94°C / 1.5
hours = 14.62 == 14 or 15 hours.
SERE
Which of the following statements about biogeochemical cycles is not true?
a. Biogeochemical cycles include living and nonliving elements.
b. The rock cycle is a biogeochemical cycle.
C. Biogeochemical cycles are an important part of the Earth system
d. Carbon, nitrogen, and oxygen cycles are biogeochemical cycles.
It is D :-) it is important and it involves living as well nonliving parts of the system
Answer: B. The rock cycle is a biogeochemical cycle.
Explanation: This question is asking for the answer that is not true about biogeochemical cycles^^^ Read carefully everyone! :)
What is Solar Spectral Irradiance (SSI)? (1 point)
A) the measure of the radiant energy emitted from the sun that reaches Earth’s atmosphere
B) the measure of the number of sunspots that appear on the sun during solar maximum
C) the measure of the amounts of different wavelengths of light in solar output
D) the measure of the amount of solar output that directly affects Earth’s climate
The solar spectral irradiance may be defined as the measure of the radiant energy emitted from the sun that reaches Earth’s atmosphere. Thus, the correct option is A.
What is Radiant energy?Radiant energy may be defined as the physical energy that results from electromagnetic radiation of the sun usually observed as it radiates from a source into the surrounding environment.
The solar Spectral Irradiance (SSI) illustrates the actual radiation that is emitted by the sun and finally reaches and falls on the earth's surface without any deflection in its intensity.
This irradiance actually estimates the level and intensity of brightness of the entire sun at a particular wavelength of light.
Therefore, the solar spectral irradiance may be defined as the measure of the radiant energy emitted from the sun that reaches Earth’s atmosphere. Thus, the correct option is A.
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Sarah is fighting a sinus infection. Her doctor prescribed a nasal spray and an antibiotic to ght the infection. The active ingredients, in milligrams, remaining in the bloodstream from the nasal spray, n(t), and the antibiotic, a(t), are modeled in the functions below, where t is the time in hours since the medications were taken.
Answer:
The antibiotics has greater initial amount of active ingredient.
Explanation:
Okay, from the question we are given the equation for the medication formula for the Nasal spray and the antibiotics, they are given as equation (1) and (2) respectively;
n(t) = [ (t + 1) / (t + 5) ] + [18 / (t² + 8t + 15) ]. -----------------------------------------(1).
a(t) = 9 / (t+3) ----------------------------(2).
Immediately Sarah used the drug, let us say time,t = 0 is the time in which active ingredients(in milligrams) are much more concentrated in the bloodstream of Sarah.
Therefore at t =0, we are going to have;
n(0) = [ (0 + 1) / (0+ 5) ] + [18 / (0 + 8(0) + 15) ].
n(0) = (1/5 + 18/15).
n(0) = 1.4.
Also, for the antibiotics, the concentration at time,t = 0 is;
a(t) = 9 / (t+3).
a(0) = 9/ 0 + 3 = 9/3 = 3.
a(0) = 3.
The values of the Nasal spay is lesser than that of the value of the antibiotics, therefore we can come to conclusion that "The antibiotics has greater initial amount of active ingredient''.
The cilia are A. the first structures involved in olfactory signal transduction. B. the axons involved in the firing of action potentials in the olfactory process. C. the last structures in the biochemical chain of events involved in odor perception. D. the cells that carry olfactory information to the thalamus. E. the most important type of epithelial cells.
Answer: The correct answer to the question is option A
THE CILIA ARE THE FIRST STRUCTURES INVOLVED IN OLFACTORY SIGNAL TRANSDUCTION.
Explanation: Cilia are organelles that is found in cells,they are hairlike in structure and they project to the outside is cells to help in mobility/locomotion in motile form and act as sensory organelles in non-motile form.
Example of places where cilia are found is the respiratory tract and female reproductive tract where they play a vital role in propelling foreign particles away from the lungs and propel the sperm in the direction of the uterus.
In olfactory signal transduction,the sensory cilia sends sensory impulse to the brain when smell isperceived especially that of food.
Students often get the impression that DNA must be replicated prior to protein synthesis. Explain why DNA is only replicated prior to the start of meiosis and mitosis
Answer:
Because each daughter cell must contain an equal and correct amount of genetic material (DNA)
Explanation:
Mitosis and Meiosis are both types of divisions that cells undergo. They both involve the production of new daughter cells. Each cell contains the information needed by it for its life processes. This information is stored in the genetic material known as DNA.
However, when a cell divides during mitosis and meiosis, two and four new daughter cells results respectively. These daughter cells need to contain the genetic material (DNA) that stores the genetic information needed for their survival. The cell ensures that each daughter cell that will result from the process of mitosis and meiosis contains this genetic material by undergoing a process called DNA REPLICATION before the start of the divisions (mitosis and meiosis).
DNA replication is the process of doubling or duplicating the information in the DNA. Hence, at the end of the replication process, the cell contains two copies of the genetic material (DNA) which separates into the daughter cells equally during cell division (mitosis and meiosis).
Protein synthesis does not need DNA replication as it involves using the information in the genetic material (DNA) to synthesize useful products (protein).
What do genes tell a cell to do
Answer:
Genes tell your cells to make molecules called proteins.
Explanation:
Hope this helped
:)
Spindle fibers move homologous chromosomes to opposite sides during what phase
Answer:
during anaphase 1
Explanation:
darn you got there before me
Spindle fibers move homologous chromosomes to opposite sides during the anaphase stage of mitosis or meiosis. This process, known as segregation, is vital for genetic diversity and guarantees a complete set of chromosomes for each subsequent daughter cell.
Explanation:The spindle fibers move homologous chromosomes to opposite sides during the anaphase stage of mitosis or meiosis. In science terminology, this is often referred to as the chromosomes being 'segregated'. It occurs after metaphase, where the chromosomes align at the metaphase plate.
Upon segregation, the chromosomes of a homologous pair are said to 'disjoin' or, to put it simply, move apart to opposite poles of the cell. This process is crucial for genetic diversity and ensures that each eventual daughter cell will receive a full set of chromosomes.
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tidal energy is generated from the
A :gravity of the sun and moon
B: natural movement of tides
C:areas that have only low tide
D : costal passageways
Answer:
C
Explanation:
I just had this question
Why the location and quality of food sources in the soil are sometimes likely to stimulate random movements by C. Elegans, but at other times are more likely to stimulate directed movements.
C. Elegans are transparent roundworms and live in the soil. It has no economic importance to humans and feeds on microorganisms.
The quality of food and location can evoke spontaneous or directed motions because of the chemicals or conditions surrounding them. The reaction exhibits that if the C. Elegans does not notice a suitable food source in proximity then they probably employ random movements.
In the presence of a few microorganisms, they move directly towards the food they desire but in the presence of chemicals then they may move towards other objects favourable which is more of a random environment.
Therefore, in the presence of good and likeable food, they tend to move towards them.
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Final answer:
The movement patterns of C. elegans in response to food sources in the soil range from random to directed based on the availability and distribution of those sources. This behavior, known as chemotaxis, helps researchers understand habitat preferences and can provide insights into the distribution patterns of pests affecting crops.
Explanation:
The location and quality of food sources in the soil can influence the movement of C. elegans, a free-living nematode found in soil environments. When the distribution of food is homogeneous and abundant, C. elegans may exhibit more random movements as food is easily accessible everywhere. Conversely, when the food sources are patchy or limited in availability, C. elegans may display directed movements, honing in on areas where the food concentration is higher. This behavior is known as chemotaxis and is a response seen in other organisms such as bacteria and plants, which also move toward favorable stimuli like nutrients or light.
Understanding these patterns of movement in C. elegans is beneficial for researchers and growers as they provide critical insights into habitat selection influences and the distribution patterns of organisms. These patterns can indicate the presence of suitable environments for different species, including pests. Moreover, the movement patterns of C. elegans under certain conditions can also inform larger scale, landscape-level interactions among different trophic levels, such as predator-prey relationships. By examining the distribution patterns of C. elegans and other organisms, growers can learn about potential impacts on crop production and make informed decisions about pest management strategies.