Answer:
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. ... The G2 checkpoint ensures all of the chromosomes have been replicated and that the replicated DNA is not damaged before cell enters mitosis.
A mutation in a tumor suppressor gene may stop a cell from checking things during the cell cycle.
Tumor suppressor genes are normally expressed genes that control the progression of a cell through the cell cycle.These genes (tumor suppressor genes) act to repair mutations that occurred during DNA replication, slow down cell division, activate programmed cell death pathways (i.e., apoptotic pathways, etc).For example, p53 is a tumor suppressor gene capable of controlling cell division rate by keeping cells from proliferating in an uncontrolled manner.In consequence, mutations of the p53 gene are often observed in cancer cells that lost their ability to regulate the rate at which they grow.In conclusion, a mutation in a tumor suppressor gene may stop a cell from checking things during the cell cycle.
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Examine the graph showing a comparison of transportation and emissions trends in the United States over the years 1980-2015.
Which statement best describes the trend for the six common pollutants, as shown in the graph?
A)
B)
The Clean Water Act addressed the six major pollutants that were
damaging the ecosystems.
The decline in vehicle miles traveled and US population correlates with a
drop in air pollution
The 1990 amendments to the Clean Air Act addressed the sources of acid
rain, smog, and toxic air pollutants.
A conversion to 100% renewable resources for energy harnessing and
electricity production caused a reduction in air pollution.
C)
D)
Why do cells need to undergo meiosis
Answer:
Meiosis is a type of cell division that reduces the number of chromosomes in the parent cell by half and produces four gamete cells. This process is required to produce egg and sperm cells for sexual reproduction. ... Meiosis begins following one round of DNA replication in cells in the male or female sex organs.
Which of these is an example of pathogen transfer via indirect contact?
a. kissing
b. handshaking
c. sexual intercourse
d. breathing infected air
Answer:
Did you read carefullly?
Explanation:
Wait ima help you im eating rn
What natural force is responsible for the formation of the cliffs by the ocean in the picture?
Answer:
i think that the wind is responsible
Plant Cell Writing Prompt
Part 2: Using your notes, write a detailed explanation of a plant cell, one of the most complex cells. Please be sure to write at least two paragraphs and highlight all parts used in your writing. Make sure your essay includes all the following parts:
cell membrane, genetic material (DNA), cytoplasm, ribosomes, cell wall, nucleus, rough endoplasmic reticulum, smooth endoplasmic reticulum, Golgi apparatus, a large vacuole, mitochondria, chloroplasts, lysosome.
Answer:
Plant cell
Explanation:
Cell wall: cell wall is only found in plant cell . it is made up of cellulose. it's function is to give shape to the cell and protect the delicate inner parts of the cell. this cell is fully permeable. it means it will allow all substance to pass in. cell membrane is made up of protein and lipids. it's function is to control what comes in and out of the cell. this membrane is selectively permeable. it means it allows some substance to pass in and others don't. cytoplasm is large sac like structure. most chemical process occur here. chromoplast are the green pigments.
cell wall is only found in plant cell . it is absent In animal cell . the neucleus in the plant cell contain a pigments haemoglobin, which contain genetic information to the cell .
Which were once eaten as a means of treating tooth aches: A) worms, B) spiders, or C) cockroaches?
Answer: hi I 4 my broter wa in thi ap
Explanation:
Answer:
I believe it is C
Explanation:
I hope this helps!
nutrients are transported to the organs of the bloodstream by which system
Answer:
The blood circulatory system delivers nutrients and oxygen.
Explanation:
Find the measure of 3.
PLZZZ HELP MEEEE!!!
The horse latitudes are areas of calm bordered on either side by the prevailing westerlies and what other wind belts?
A. jet streams
B. polar easterlies
C. trade winds
D. doldrums
Answer:
es la c. trade winds o es la A. jet streams
Which of the following statements about coral reefs is TRUE?
O Coral reefs are generally less than ten years old.
o Coral reefs contain a great diversity of life and species.
O Coral reefs cover most of the world's ocean floor.
O Coral reefs contain very few species other than fish.
Answer:
The correct answer is "Coral reefs contain a great diversity of life and species." as while they cover 1% of the ocean floor, they are homes to more than 25% of marine life.
Explanation:
The following statements about coral reefs are true: "Coral reefs contain a great diversity of life and species." That is the second option, as the coral reefs are among the most diverse and biologically rich ecosystems on the planet.
What is the importance of coral reefs to the ecosystem?The coral reef is a type of structure that forms large, interconnected structures, creating a habitat for a wide range of other species, such as fish, crustaceans, and mollusks, and the reef provides shelter and food for a diverse array of organisms. Coral reefs generally occur in warm waters along the coasts of tropical and subtropical areas, so climate change harms them.
Hence, the following statements about coral reefs are true: "Coral reefs contain a great diversity of life and species." That is the second option, as the coral reefs are among the most diverse and biologically rich ecosystems on the planet.
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1Which of the following animals is a primary consumer?
Include at least 3 ways that illegal fishing impacts the environment and descriptions
Answer:
Goodluck. I hope I helped
Explanation:
Oceans support the livelihoods of an estimated 520 million people who rely on fishing and fishing related activities, and 2.6 billion people who depend on fish as an important part of their diet. But Illegal fishing is threatening the food supply of coastal communities as fish populations decline due to overfishing in areas fishers are not permitted to access. Addressing illegal fishing will positively contribute to the equitable growth and empowerment of the people who rely on oceans for food and income.
A specific characteristic that an organism can pass on to its offspring through its genes is called a
Answer: A Trait
Explanation:
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3
1 The table gives the content of glucose, urea and
calcium ions in the blood entering the kidney, in
the glomerular filtrate and in the urine of a person.
Values are given in mg per 100 cm'.
Component/mg per 100 cm
Blood Glomerular filtrate
Urine
Component
glucose
100
100
urea
26
26
1820
S
calcium ions
4
4
5
C
a):) Which of the components provides energy for
the body?
ii) Which of the components is a metabolic
waste product?
[1]
b) Explain why the figures for each component are the
same for the blood concentration and
glomerular filtrale.
[3]
c) i) If the
person
drank a large volume of water,
far more than was needed by the body,
predict what would happen to the figures
in the urine column.
[2]
ii) Describe the processes taking place in the
body to support your answer to (c)(i). [3]
3
Answer:
c
Explanation:
dmvs.dfm
what does the respritory system do?
Answer:
The respiratory system's main job is to move fresh air into your body while also removing waste gases.
Explanation:
Your lungs are part of the respiratory system, a group of organs and tissues that work together to help you breathe.
PLEASE HELP!!! I'll mark the first correct answer brainliest!!! 9. A gene has the base sequence that starts with: TAG CAT GGC AT
a) What would be the mRNA base sequence formed during transcription, using the DNA sequence shown above? (3 points)
b) What would be the first three amino acids in the protein formed from this gene? (3 points)
c) The gene has a mutation and is changed to the sequence below.
TAG CTT GGC AT
What kind of mutation is this? (2 points)
d) What is the new mRNA strand formed by this gene? (3 points)
e) What are the new amino acids formed from this gene? (3 points)
f) Describe how the mutation has affected the protein coded by this gene. (3 points)
The mRNA base sequence formed during transcription, using the DNA sequence TAG CAT GGC AT would be: AUC GUA CCG UAG. The first three amino acids in the protein formed from this gene would be: Isoleucine, Valine, and Proline. The new mRNA strand formed by this gene due to the mutation would be: AUC GUU GCC UAU
What are the new amino acids formed from this gene?The new amino acids formed from this gene due to the mutation would be: Isoleucine, Leucine, and Cysteine (since the codons for these amino acids are AUG, CUU, and UGU respectively).
Describe how the mutation has affected the protein coded by this gene.The mutation has affected the protein coded by this gene by changing the second amino acid from valine to leucine. Depending on the specific protein, this could potentially impact its function and structure, which could affect the organism's phenotype.
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Mei likes biology and would like to work in a hospital. She wants to attend school for only one or two years beyond high
school. Which could be a possible career choice for her?
O epidemiologist
O geneticist
O sonographer
O pathologist
Answer:
Sonographer
Explanation:
This is because sonography require four years to study in school and a sonographer is an health care scientists who specializes in using ultrasonic imaging devices to produce scans, videos, diagnostic images, three dimensional images e t.c.
What is the most common type of ocean pollution?
Cigarette butts are the most common form of marine litter.
Pioneer species such as lichen and moss inhabit an area after a major disturbance such as a volcanic eruption. Over time, other species are found in the disturbed area and the number of pioneer species decreases. Why does the number of pioneer species decrease? The amount of available sunlight is reduced. The pioneer species can no longer thrive. ⊝ The area has more soil to support complex plants. The competition increases between organisms. ⊝ The area is more susceptible to the wind. Seeds are captured in the pioneer plants and germinate at a higher rate. ⊝ The temperature is not as extreme as it was following the disturbance. Fewer of the pioneer species reproduce. ⊝ CLEAR ALL ❮ PREVIOUS ... 3 4 5 6 7 8 9 10 11 12
Answer:
The competition increases between organisms.
Explanation:
Primary succession occurs after a disturbance or disaster that leaves open spaces with no living organisms. These new open areas are the case, for instance, of a bare rock exposed due to a retreating glacier, a volcanic activity, or an intense fire. No previous species inhabiting this area are left.
These scenarios allow new species to grow. With time, new species arrive and manage to establish again. The order of the establishment depends on the strategies of each of the species to survive.
First, pioneer species arrive. These are the first inhabitants, mostly lichens or plants with the capability of surviving in such an environment. Only a few pioneers can establish in the open space. Pioneers modify the habitat. They make it more suitable for the posterior establishment of later species, converting rock into fertile soil. As conditions get better, new species arrive like grasses. Grasses and pioneers keep modifying the ground and making it better with time. Competition becomes more frequent between species. The first species are eventually eliminated by competition, while new species keep appearing and competing for resources. Habitat modification keeps on going while new species establish. They produce shadows, alter the temperature, and humidity, fertilizing the soil, competing for resources. Competition becomes more frequent between species. This sequence continues until there is not more facilitation, and the commuting reaches a climax, becoming stable and lasting for hundreds of years until another disturbance occurs.
What does a bioprospector do?
Answer:
bioprospecting. The analysis of plants, animals, insects and other organisms in an ecosystem with high biodiversity for therapeutic candidate molecules and substances.
Explanation:
Answer:
It does the analysis of plants, animals, insects and other organisms in an ecosystem with high biodiversity for therapeutic candidate molecules and substances.
Explanation:
Which of these mammals are native to Virginia
Armadillo
Camel
Kangaroo
Squirrel
(Don’t leave links)
Answer:
Right a way, we know that a camel or a kangaroo are NOT native to Virginia. Now we have the armadillo and the squirrel.
"Originally native to South America, the armadillo now ranges as far north as Texas, Oklahoma, Kansas, Louisiana and Florida." - so we can rule out armadillos!
Virginia has 4 different kinds of squirrels that are native, so squirrel would be your answer.
Hoped this helps!
Activated complement brings about the death of a microbe when it _______________.
A. organizes into a membrane pore and causes lysis of the cell
B. mediates interactions between immune cells
C. activates a chemotaxic response in certain phagocytic cells
D. all of the above
Answer:
C
activates a chemotaxic response in certain phagocytic cells
The sea is the ________________________ ecosystem in the world .
What type of chart is used to help organize study and predict genetic inheritanc
Helicase is an enzyme responsible for unwinding the double helix of the DNA by breaking apart the hydrogen bonds between each of the base pairs. Which phase of the cell cycle is helicase most likely active?
A) S
B) М
C) G1
D) G
Helicase is an enzyme responsible for unwinding the double helix of the DNA by breaking apart the hydrogen bonds between each of the base pairs. Helicase is more active in the S phase of the cycle. Option A is the correct answer.
What are the events of the cell cycle?
The cell cycle consists of the interphase and the cell division phase, where the cell division takes a little time in comparison to the interphase. The parent cell spends the majority of its time in the cell cycle's interphase and less time in the cell division phase.
There are three phases in the cell cycle's interphase: G1, S, and G2. The cell grows in both the G1 and G2 phases, while the DNA replicates in the S phase.
Hence, helicase is an enzyme that is responsible for unraveling the double helix of DNA by breaking apart the hydrogen bonds between each base pair. Helicase is more active in the S phase of the cell cycle. Option A is the correct answer.
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Which statement best describes the role of transfer RNA in protein synthesis?
Transfer RNA carries a copy of the DNA base sequence to the cytoplasm.
Transfer RNA matches up amino acids with the base sequence copied from DNA.
Transfer RNA composes the ribosome on which the protein forms.
Transfer RNA brings nucleotides to make a copy of the DNA base sequence.
Answer:
transfer RNA carries a copy of the DNA base sequence to the cytoplasm
Explanation:
i am sorry if this is wrong
Answer:
its b (transfer RNA matches up amino acids with the base sequence copied from DNA)
Explanation:
I need help on this one!
Answer:
Classify I beilieve!
Explanation: You would need to do this because in order for you to study it you would have to classify them.
In a scientific investigation, after the question is defined, the next step is most likely which of
the following statements?
A. Collecting the data
B. Formulating a hypothesis
C. Designing the experiment
D. Identifying materials needed
In a scientific investigation, the next step after the question is defined is to formulate a hypothesis. A hypothesis is a testable explanation or a prediction. Therefore, the correct option is B.
What is Hypothesis?A hypothesis is the proposed explanation for a phenomenon. For a hypothesis to be scientific, the scientific method requires one to test it. Scientists generally form hypothesis on the basis of scientific hypotheses of previous observations that cannot satisfactorily be explained with the available scientific theories.
Types of hypothesis include simple hypothesis, complex hypothesis, and directional hypothesis.
After the question has been defined, the next step taken by a researcher is to form a hypothesis, or testable explanation. It is about making predictions based on the hypothesis and further test the prediction.
Therefore, the correct option is B.
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not all words are used.
will mark brainliest if correct.
Answer:
I D K
Explanation:
I just wasted 10 minutes on this and I am so confused:)
All 37 trillion cells in the human body came from?
Answer:
all 37 trillion cell in the body originates from a single fertilized egg called a zygote. The zygote divides repeatedly to produce an embryo. These embryonic cells continue to divide, differentiating into all the cell types present in the body of all humans (and other mammals), from a new-born baby to an elderly adult.