Answer:
LEARNING OBJECTIVES
Identify important checkpoints in cell division
Explain how errors in cell division are related to cancer
The length of the cell cycle is highly variable, even within the cells of a single organism. In humans, the frequency of cell turnover ranges from a few hours in early embryonic development, to an average of two to five days for epithelial cells, and to an entire human lifetime spent in G0 by specialized cells, such as cortical neurons or cardiac muscle cells. There is also variation in the time that a cell spends in each phase of the cell cycle. When fast-dividing mammalian cells are grown in culture (outside the body under optimal growing conditions), the length of the cycle is about 24 hours. In rapidly dividing human cells with a 24-hour cell cycle, the G1 phase lasts approximately nine hours, the S phase lasts 10 hours, the G2 phase lasts about four and one-half hours, and the M phase lasts approximately one-half hour. In early embryos of fruit flies, the cell cycle is completed in about eight minutes. The timing of events in the cell cycle is controlled by mechanisms that are both internal and external to the cell.
Explanation:
Regulation of the Cell Cycle by External Events
Both the initiation and inhibition of cell division are triggered by events external to the cell when it is about to begin the replication process. An event may be as simple as the death of a nearby cell or as sweeping as the release of growth-promoting hormones, such as human growth hormone (HGH). A lack of HGH can inhibit cell division, resulting in dwarfism, whereas too much HGH can result in gigantism. Crowding of cells can also inhibit cell division. Another factor that can initiate cell division is the size of the cell; as a cell grows, it becomes inefficient due to its decreasing surface-to-volume ratio. The solution to this problem is to divide.
Whatever the source of the message, the cell receives the signal, and a series of events within the cell allows it to proceed into interphase. Moving forward from this initiation point, every parameter required during each cell cycle phase must be met or the cycle cannot progress.
Regulation at Internal Checkpoints
It is essential that the daughter cells produced be exact duplicates of the parent cell. Mistakes in the duplication or distribution of the chromosomes lead to mutations that may be passed forward to every new cell produced from an abnormal cell. To prevent a compromised cell from continuing to divide, there are internal control mechanisms that operate at three main cell cycle checkpoints. A checkpoint is one of several points in the eukaryotic cell cycle at which the progression of a cell to the next stage in the cycle can be halted until conditions are favorable. These checkpoints occur near the end of G1, at the G2/M transition, and during metaphase
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anybody know how to do this?
Answer:
Sorry
Explanation:
Sorry I don’t understand to so I can’t help you
Which geological feature would most likely occur at this boundary? (the plates are the same density.)
A) mid-ocean ridge, rift vallyes
B) earthquakes
C) volcanos
D) mountain chains
Answer:
a
Explanation:
Of the three states of matter -- solid, liquid, and gas -- which one exerts the highest pressure on its container, and why?
Answer:
gas because its going super fast and free
Explanation:
Which organelle is the location where mRNA is translated into a protein?
Answer:
its ribosomes. In eukaryotes, mature mRNA molecules must leave the nucleus and travel to the cytoplasm, where the ribosomes are located.
Answer:
ribosomes
Explanation:
True or False: Eye Color: Blue and Brown and Freckles: Freckles or no freckles are examples of human traits that have 2 variations of that trait. Typically there is not any human trait like these that are more beneficial than another.
Answer:
Explanation:
True
Name one organism that produces glucose through the process of chemosynthesis. Explain why it cannot produce glucose using photosynthesis.
Answer:
During chemosynthesis, bacteria living on the sea floor or within animals use energy stored in the chemical bonds of hydrogen sulfide and methane to make glucose from water and carbon dioxide (dissolved in sea water). Pure sulfur and sulfur compounds are produced as by-products.
Explanation:
Answer:
During chemosynthesis, bacteria living on the sea floor or within animals use energy stored in the chemical bonds of hydrogen sulfide and methane to make glucose from water and carbon dioxide (dissolved in sea water). Pure sulfur and sulfur compounds are produced as by-products.
Explanation:
How does the oyster population
In the Chesapeake Bay ecosystem affect the floating to sea floor ratio of algae
populations
Answer:
Analysis of the data shows that the ratio of floating algae to sea floor algae dramatically increased at the same time that oysters were removed from the Bay. ... (It is also possible to infer from the graph that high floating algae levels led to the decline in oysters.
Answer: Analysis of the data shows that the ratio of floating algae to sea floor algae dramatically increased at the same time that oysters were removed from the Bay. ... (It is also possible to infer from the graph that high floating algae levels led to the decline in oysters.
What macromolecules would you find in Blazin' wings and celery?
design your own, you can use the Browse feature to attach and upload your document. 5. Design your own experiment based on one of your questions from question 1, above. Include the question, hypothesis, independent and dependent variables, and safety precautions. 6. What are three major branches of Earth science?
Answer:
three major branches of earth science are Geology, oceanography, meteorology.
Match each gymnosperm to its correct description. plzzz help me reeee
Answer:
Explanation:
Ginkgoes lose their leaves in autumn
Cycads look like a palm tree
Gnetophytes grow in deserts and rain forests
Conifers make up the largest group of gymnosperms.
Each gymnosperm is matched according to their correct description
Ginkgoes lose their leaves in autumnCycads look like a palm treeGnetophytes grow in deserts and rain forestsConifers make up the largest group of gymnosperms.What are Gymnosperms?Gymnosperm is a seed-producing plant which do not produce flowers or fruits and have uncovered seeds. These are born in cones and are not visible until maturity.
There are several characteristics of Gymnosperms. They are:
1. They are autotrophic, photosynthetic plants which tend to conserve water.
2. They have vascular system which includes roots, xylem, and phloem that is used for the transportation of water and nutrients.
3. The ovules and seeds of gymnosperms develop on the scales of cones which is in enclosed chambers called ovaries.
4. They are older than angiosperms on the basis of evolution.
They are divided into four classes like
Ginkgoes Cycads Gnetophytes ConifersThus, each gymnosperm is matched according to their correct description
Ginkgoes lose their leaves in autumnCycads look like a palm treeGnetophytes grow in deserts and rain forestsConifers make up the largest group of gymnosperms.Learn more about Gymnosperms, here:
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genetic engineering might allow parent to 'design' their children before birth are you in favor of this? why or why not?
Answer:
I think it is quite an interesting idea to allow parents to 'design' their children before birth. Because some people have preferences and those preferences are taken very seriously. I wouldn't want to have a baby boy, I would want a baby girl. Although, this could be a waste of money and time because this might be one of the things that are better not to be fixed even if it isn't broken. But, this can also be good, if you desperately need a child with specific features, this can help. Even if I can't seem to find a reason where a child is supposed to have specific features.
Explanation:
The alteration of the natural gene by the tools is called genetic engineering. The application of genetic engineering is to make transgenic animals that give protein-rich products and transgenic plants which are disease-free.
The idea of genetic engineering is quite subjective. some people find it right and some find it wrong. In order to evolve biological science, genetic engineering is important but ethically and morally genetic engineering is not good as we altering nature's work.
Genetic engineering allows a parent to check the genetic disease of the child and help them to cure it but it is ethically wrong if they used it to find the sexual gender of the child.
Hence, genetic engineering is wrong in a limited way.
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How are ions such as phosphate absorbed by plant roots?
how did the frame shift change the amino acid
During translation, the sequence of codons is read in order from the nucleotide sequence to synthesize a chain of amino acids and form a protein.
Therefore, frameshift mutations result in abnormal protein products with an incorrect amino acid sequence that can be either longer or shorter than the normal protein.
Hope this helped!
Our biggest loser went from 403lbs to 288lbs. He lost a total of 215lbs. Explain what happened to the 215lbs. Be sure to discuss what he did, the process(es) that took place, the type of matter he lost, and the type of matter he lost it as.
Answer:
Explanation:
Weight on a human body is mainly stored as muscle or fat. When we exercise we don't necessarily lose fat. Instead, the fat cells tend to shrink in size but remain the same amount. Fat is converted into energy which the body uses to function. This energy is expelled from the body in many different forms such as carbon dioxide and sweating. Therefore those are the matter that the individual in question lost when losing the 215lbs
primates evolved during what era
What change caused the rate of population growth to increase around point C?
Answer:
point c
Explanation:
What percentage of those struck by
lightning, live to tell about it?
of every ten people struck by lightning, nine will survive and tell the tale.
Why type of cells in your body are created through the cell cycle and mitosis?
Mitosis is a way of making more cells that are genetically the same as the parent cell. It plays an important part in the development of embryos, and it is important for the growth and development of our bodies as well. Mitosis produces new cells, and replaces cells that are old, lost or damaged. Hope I helped! ^^
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有糸分裂は、親細胞と遺伝的に同じであるより多くの細胞を作る方法です。それは胚の発達において重要な役割を果たしており、私たちの体の成長と発達にとっても重要です。有糸分裂は新しい細胞を生成し、古い、失われた、または損傷した細胞を置き換えます。私が助けてくれたらいいのに！ ^^
As a cell grows in size, transporting the materials in and out of the cell becomes more difficult. Which process would help a cell to efficiently transport more materials into the cell as it grows?
Grupo de escolhas da pergunta
A) The cell develops a thinner cell membrane.
B) The cell undergoes a mutation.
C) The cell stores more materials in its vacuoles.
D) The cell divides into two cells creating more space for materials.
ASAP
Answer:
A
Explanation:
The process that would help a cell to efficiently transport more materials into the cell as it grows is the cell develops a thinner cell membrane (Option A).
What is cellular transport?Cellular transport is a process by which cells can take substances from their surrounding environment.
Cellular transport depends on the characteristic of the cell membrane where the substances need to pass.The mechanisms of cellular transport include active transport and passive transport.In conclusion, the process that would help a cell to efficiently transport more materials into the cell as it grows is the cell develops a thinner cell membrane (Option A).
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What would happen if there was too much Carbon Dioxide in the atmosphere? What if there were no processes to pull Carbon
Dioxide out of the atmosphere?
Which of the following is linked to an increase in brain size and intelligence in
hominids?
O Increased speed and strength
O Increased social interactions
O Decreased use of tools and language
O Development of more complex and tools and language
HURRY PLEASE IM TIMED!!!!!
Answer:
D
Explanation:
When The evolution of human intelligence is closely tied to the evolution of the human brain and also that to the origin of language.When larger brain size and also that volume is associated with better cognitive functioning and higher intelligence. Although when The specific regions that show the most robust correlation between volume and also that intelligence are the frontal, temporal, and also parietal lobes of the brain.
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Which of the following is an advantage angiosperms and gymnosperms have over mosses?
1. they are seed producing so can populate more areas
2. they can photosynthesize
3. they can use oxygen
4. they do not need water
Answer:
they are seed producing so can populate more areas
Explanation:
What cell structures are made in G1?
Answer:
Organelles
Explanation:
Welp: That moment I knew I didn't pay attention when I should have
Answer:
a series circuit has a 2 Ω (ohm) resistor, a 5 Ω resistor, and a 7 Ω resistor. The total resistance of the circuit is 2 + 5 + 7 = 14 Ω.
Explanation:
Not very good for you
Answer:
lol
Explanation:
Yeah you need to start paying attention in class
Tommy’s dad is teaching him how to make tables out of tiles. Tommy makes a small table that is 3 feet wide and 4 feet long. How many square foot tiles does he need to cover the top of the table? How many feet of decorative border material will his dad need to cover the edges of the table? I need area and perimeter
Answer:
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WILL GIVE BRAINLYST
The process our cells use to convert broken down glucose into carbon dioxide (CO2) and water (H2O) is called what?
Question 3 options:
Aerobic Respiration
Anaerobic Respiration
Breathing Respiration
Cellular Respiration
Answer:
Aerobic Respiration
Explanation:
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Can i have brainlyst pls. :)
Which type of cell is considered the least complex?
Answer:
tissues.
organs.
organ systems.
organism.
Explanation:
Answer:
the answer would be tissues
Which protists contain both chloroplasts and eyespots?
A .amoeba and paramecia
B. volvox and paramecia
C. euglena and amoeba
D. euglena and volvox
.
D. Euglena and volvox contain both chloroplasts and eyespots.
What are protists?
Protists are single-celled microorganisms that belong to the kingdom Protista. They are unicellular organisms that are not classified as bacteria, fungi, or animals, and are the simplest of the eukaryotes (organisms with a true nucleus and other membrane-bound organelles). Protists are found in a wide variety of habitats, from freshwater to marine environments, and are important for their role in the food chain, as well as for their impact on human health.
Protists come in a wide range of shapes and sizes, from amoeba-like organisms that can change shape, to algae with chloroplasts, to parasites that can cause diseases in humans and other animals. Some protists can move on their own, while others are immobile. Some can reproduce asexually, while others reproduce sexually. Despite their diverse forms and functions, all protists are considered to be part of the same kingdom because of their shared characteristics and evolutionary relationships.
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What is the major thing happening to a cell during G1?
Answer:
During this stage new organelles are being synthesized (made), so the cell requires both structural proteins and enzymes, resulting in great amount of protein synthesis. Color the G1 phase green on the cell cycle drawing.
Explanation:
All multicellular algae are what?
Answer:
Algae (singular: alga) are photosynthetic, eukaryotic organisms that do not develop multicellular sex organs. Algae can be unicellular, or they may be large, multicellular organisms.The multicellular algae develop specialized tissues, but they lack the true stems, leaves, or roots of the more complex, higher plants.
Explanation:
