Answer:
rate of division
Explanation:
In normal cells, the cell cycle is controlled by a complex series of signaling pathways by which a cell grows, replicates its DNA and divides. In cancer, as a result of genetic mutations, this regulatory process malfunctions, resulting in uncontrolled cell proliferation.
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Cancer is a disease in which some cells lose their ability to control rate of division. The correct option is C.
What is cancer?Cancer is the body's unchecked proliferation of aberrant cells. When the body's natural control system malfunctions, cancer might emerge.
Instead of dying, old cells proliferate uncontrollably to produce new, aberrant cells. These excess cells could aggregate into a tissue mass known as a tumour.
Genes, the fundamental building blocks of inheritance, can change in ways that result in cancer.
Chromosomes are long, tightly packed DNA strands where genes are organised. Since genes that determine how our cells behave, particularly how they grow and divide, are altered, cancer is a genetic disease.
Thus, the correct option is C.
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In perspective, with Earth being 4,500,000,000 years old and humans being around 1,400,000 years; how long out of a 24 day time period have we as humans been here.
Answer:
Day time period have we as humans been here: 26 seconds
Explanation:
4,500,000,000 years = 1 day
1,400,000 years = X
X = 0.0003111
1 day = 86,400 seconds
0.0003111 = X
X = 26 seconds
In term of the Earth in 24-hour clock, Homo sapiens appeared on our planet only in the last 26 seconds, it means that in geologic time, humans have existed for only a brief time period and thereby it is a relatively new species.
please send me labeled scorpion
Which bests describes a pilus
Answer:
A tube that extends from a bacterium
Explanation: A tube that extends from a bacterium
Answer:
A tube that extends from a bacterium
Explanation:
Caregiving has been associated with:____________
a) a stronger immune response.
b) a higher percentages of T cells.
c) underproduction of proinflammatory cytokines.
d) overproduction of proinflammatory cytokines.
You are a farmer starting an orchard and interested in breeding citrus trees. In grapefruits, big fruit (B) is dominant over small fruit (b), and silky skin (S) is dominant over rough skin (s). You cross a homozygous tree that has big fruit and silky skin, with a homozygous tree that has small fruit and rough skin. You self-cross the F1 to produce the F2.
Required:
a. What will be the phenotypic ratios in the F2?
b. If you backcross an F1 tree with the big, silky skin parent, what phenotypes and proportions would you expect in the offspring?
c. If you backcross an F1 tree with the small, rough skin parent, what phenotypes and proportions would you expect in the offspring?
Karl wants to devise a green and novel way to power some LEDs in a swimming pool as part of his science project. Consider the swimming pool when its in use to be a model of the ocean. Which form of renewable energy will he be able to generate from the swimming pool? A. tidal B. wind C. wave D. geothermal
Explanation:
I doubt between options b and c
Answer:
Wave
Explanation:
I just took the test on plato and it was correct :)
Hamilton’s rule states that:
a. altruism evolves only among nonkin.
b. selfish genes swamp altruistic genes.
c. altruistic behavior is favored if the cost to the actor is less than the benefit to the recipient, devalued by the degree of relatedness.
d. altruistic behavior is favored if the benefits to the actor are greater than the costs to the recipients, devalued by their degree of relatedness.
Answer:
The correct answer is option D.
Explanation:
Hamilton rules state that any trait that helps in benefiting others, B, is multiplied by genetic relatedness, R, which is greater than cot to self, C, it is favored by the process of natural selection.
As indicated by Hamilton's rule, the kin selection makes qualities increment in recurrence when the hereditary relatedness of a beneficiary to an actor multiplied by the advantage to the beneficiary is more noteworthy than the regenerative expense to the actor.
Thus, the correct answer is option D.
Type the correct answer in the box. Spell all words correctly.
What is the correct term for splitting an atom to release nuclear energy?
Splitting the nucleus of an allom to release energy is referred to as nuclear
Answer:
The splitting of a uranium atom releases energy. This process is called “nuclear fission”, since the centre of an atom is called its nucleus. When a uranium atom splits it gives off more neutrons, which can then split more atoms, and so the energy level rapidly multiplies
Explanation:
The splitting of a uranium atom releases nuclear energy by the process called nuclear fission, releases more neutrons, which can then split atoms, and energy level multiply rapidly.
What is nuclear energy ?The Energy is stored in the core of atom called nuclear energy.
The mass of an atom refers to the mass of nuclear elements like total mass of neutron and proton present in it.
Nuclear reaction can either be nuclear fission or fusion which releases the nuclear energy.
The process in which atoms combine to form a larger atom called nuclear fusion, while the process in which the the breakdown of atoms with the release of energy called nuclear fission.
Nuclear power plants produce energy by nuclear fission where as Sun produces energy by nuclear fusion.
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RNA and dna are both what?
A. Made up of nucleotides and carry molecules from on end of a cell to another.
B. Monomers of protein molecules that provide structure to a cells nuclear membrane.
C. Protein molecules that carry the unique genetic information of an organism.
D. Molecules that contain genetic information and are made up of nucleotides.
Answer:
I think it is a
Explanation:
Colonial protists have been hypothesized to be the precursors to multicellular organisms. This hypothesis suggests that the individual unicellular members of the colony, which are initially identical, can begin to take on different functions. Then. the colony can begin to evolve into a multicellular organism. True or False
Answer:
True.
Explanation:
Protists are group of eukaryotes that are unicellular or microscopic and some times multicellular. They can live in colonies and live individually.
Some protist live in large groups called colony.
Colonial protists form larger groups of multicellular organisms. The individuals work together as large groups and perform functions to benefit each other.
most of the colonial protist are filter feeders that feed on suspended particles. Colonies enhance feeding efficiency. In choanoflagellates, coloniest has led to the evolution of metazoans
True r false- Hurricane storm categories increase as wind increases and pressure decreases.
Answer: False
Explanation: I think it's false because, hurricane damages are caused by storm surges, strong winds and associated tornadoes.
which structure is found in the cytoplasm of a prokaryotic cell but is not found in the cytoplasm of a eukaryotic cell
Answer: DNA
is found in the cytoplasm of a prokaryotic cell. Not found in the cytoplasm of a eukaryotic cell.
A receptor is a structure that detects stimuli. The stigma (eyespot) of Euglenoids detects ____, assisting with phototaxis. A. light intensity and direction B. vibrations C. chemicals D. sound frequency and direction E. temperature change
Answer:
The correct answer is option A, that is, light intensity and direction.
Explanation:
A photoreceptive organelle witnessed in the motile or flagellated cells of unicellular photosynthetic species like euglenoids and green algae is known as the stigma or the eyespot apparatus. It permits the cells of the organism to detect the intensity and direction of the light and react towards it.
This assists the organisms to either swim away from the light known as negative phototaxis, or to swim towards it known as positive phototaxis. The eyespots are the basic and the most typical eyes witnessed in nature. The eyespots comprise bright areas or orange and red granules of pigment and photoreceptors.
What is the role of the pancreas
Answer:
It converts food you consume into body fuel for our cells.
Answer:
It produces digestive enzymes
Explanation:
Just took the quiz
In his experiments with different competing pairs of Paramecium species, Gause found that sometimes both species persisted and sometimes only one species did. Which hypothesis did Gause propose in order to explain the cases in which both species persisted?
Answer: The options are not given, here are the options.
A. One species is much better competitor than the other.
B. Periodic disturbances allow for coexistence.
C. Two species tended to use different resources.
D. The two species experienced interference competition and not exploitative competition.
The correct option C.
Two species tended to use different resources.
Explanation:
From Gause experiments on competing paramecium pairs, He found out that most times both species persisted and sometimes only one did because the two species uses different resources.
Organisms normally compete for limited resources in order to survive and one intend to compete well while other suffer. Both in the case of competing paramecium pairs, the pair use different resources which make the to persist and survive well. Once the resource of one finishes, the other one will persist because it is still surviving on its available resources.
A scientist analyzed a segment of DNA from a human chromosome and found that the percentage of thymine molecular bases (T) was 35%. Which
row in the chart below contains the correct percentages of the other molecular bases in the DNA segment?
Row
Guanine (G) Cytosine (C) Adenine (A)
15%
25%
25%
A.
25%
25%
15%
B.
15%
15%
35%
C.
35%
15%
15%
D
Answer:
C. 15% 15% 35%
Explanation:
This follows the rules of base pairing. The amount of thymine (T) equals the amount of adenine (A), and the amount of guanine (G) equals the amount of cytosine (C).
Since thymine is equal to adenine and 35% of the bases is thymine, 35% of the bases is also adenine. This gives you a total of 70%.
35% + 35% = 70%
Now you need to figure out how much cytosine and guanine are in the bases. Since 70% of the bases are adenine and thymine, 30% will be cytosine and guanine.
100% - 70% = 30%
Since the amount of cytosine and guanine are equal, divide 30% by 2 to figure out how much each base takes of the total.
30/2 = 15%
Cytosine and guanine each take up 15% of the molecular bases.
The fruit fly Drosophila melanogaster is an important model system for studying inheritance in animals and genetic control of animal development, including humans. Evaluate Drosophila as a model system for human biology. What are their strengths and weaknesses as a model system? g
Answer:
The correct answer is "strengths: inexpensive, easy to culture, short life cycle, large number of offspring; weaknesses: invertebrate model, some diseases such as immunological cannot be modelled, anatomical features are very different from humans"
Explanation:
The fruit fly Drosophila melanogaster is one of the most used animal model for genetic and biomedical studies. There are many advantages of using Drosophila as model, including that it is very inexpensive to handle, it is easy to culture, it has a short life cycle allowing to observe the changes in phenotype very quickly and its large number of offspring allows to include several repetitions per trait in a study. However, there are some weaknesses of using Drosophila to study human biology. First, obviously the fruit fly is very different from humans, it is an invertebrate and its anatomical features are very different, which makes impossible to model some disorders such as immunological diseases.
In the lab on Trophic Interactions you were looking at behavior of mosquito larvae. The question being asked was: Does prey behavior change in the presence of a predator? What would be an appropriate null hypothesis for this experiment? Recall in Treatments 2 and 3, a predator was added to the mosquito tanks.
Answer:
Null hypothesis: the behavior of mosquito larvae doesn't change in the presence/absence of predators added to the tanks in Treatments 2 and 3.
Explanation:
In statistics, the null hypothesis states that there are no differences between the two variables tested in the experiment, while the alternative hypothesis uses the experimental data in order to reject the null hypothesis. In this case, the alternative hypothesis will use the data from treatments 2 and 3 to confirm that predators can modify the behavior of mosquito larvae.
While doing research on deep-sea vents, you discover a very simple new life form. After some initial analysis, you find that this life form contains small fragments of DNA, small complementary RNA fragments, and proteins. Fortuitously, you collected two strains, one that is purple and one that is yellow. You wish to discover which of those three molecules could be the genetic material. You heat-kill some of the purple life form and subject three different homogenized samples to different enzymes: DNase, RNase, or protease. Which treated sample(s) will transform yellow into purple IF RNA is the genetic material
Answer:
The one treated with DNase and protease
Explanation:
The samples that will transform yellow into purple if RNA is the genetic material are the ones treated with DNase and protease respectively.
The treatment of the heat-killed sample of the purple life with DNase will ensure that the DNA in the sample becomes degraded while treatment with protease will ensure that protein is degraded, leaving only the RNA. Thus, the RNA can be taken up by the yellow life form and become transformed into purple if indeed RNA is the genetic material.
The sample treated with RNase cannot transform the yellow life into purple because the RNase catalyzes the degradation of RNA into smaller components.
A bacterium synthesizes DNA from each replication fork at a rate of 1000 nucleotides per second. This bacterium completely replicates its circular chromosome by theta replication in 30 min. How many base pairs does the chromosome contain
Answer:
180,000 nucleotide pairs = 180 kilobase pair (kbp) = 0.18 Megabase pairs (Mbp)
Explanation:
Synthesis rate = 1,000 nucleotides (nts) x second
1 minute = 60 seconds
30 minutes = 60 x 30 = 1,800 seconds
>> 1,800 seconds x 1,000 nuleotides per second = 180,000 nts
A typical bacterial genome contains approximately 5 Mbps of DNA that conforms a circular chromosome localized in the cytoplasm. In consequence, in this case the bacterial genome is small (0.18 Mbp).
DNA replication is a process in which the fragment gets replicated to form two indistinguishable replicas of itself. It is vital for the growth and passing of hereditary information to the newly produced daughter cells.
180,000 nucleotide pairs are formed in the replicating bacteria.
This can be calculated by:
[tex]\text{Synthesis rate} & = 1,000 \;\text{nucleotides (nts)} \times \text{ second}[/tex]
We know that 1 minute = 60 seconds So, 30 minutes = 60 x 30 = 1,800 seconds[tex]\text{1,800 seconds} \times \text{ 1,000 nucleotide per second} & = 180,000 \;\text{nts}[/tex]
The bacterial genome thus produced will have 180,000 nucleotide pairs or 180 kilo-base pairs (kbp) or 0.18 Megabase pairs (Mbp) in the chromosome.
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Victoria pushes on a wall in front of her with a force of 25 N while she is
standing on roller skates. Which of the following is true?
A. A force less than 25 N pushes back on Victoria.
B. A force greater than 25 N pushes back on Victoria.
C. No force pushes back on Victoria because the wall doesn't move.
D. A force of 25 N pushes back on Victoria.
US
II. PARTS OF THE DIGESTIVE TRACT A. ORAL CAVITY After ingestion, the physical breakdown of solid foods (mechanical digestion) begins in the oral cavity (mouth). Describe how food is mechanically digested in the oral cavity. Include a discussion of how the teeth, tongue, and saliva work together to convert solid food into a moist, semi-solid mass of food called a bolus. Example: think of how a hard, dry saltine cracker is converted into a moist ball (bolus) in the mouth. B. PHARYNX and ESOPHAGUS 1. After food has been mechanically digested, mixed with saliva, and a bolus has formed, it is swallowed. Swallowing moves the bolus from the mouth into the esophagus. Discuss the events that occur during swallowing. 2. Which portions of the pharynx does food pass through when swallowing
Answer:
This begins with the gradual breaking down of the food in the mouth, by grinding the food substances with the teeth this is mastication, and the secretion of saliva, which moisten the food, soften it so that the salivary amylase enzyme, carried out the mechanical digestion.
Swallowing is a wavelike muscular contraction which involve the contraction of the longitudinal and circular muscles of the oesophagus, which pushes the bolus down to the stomach.
The food pass Oropharynx. While the epiglottis prevents the bolus from entering the trachea.
This is followed by the rolling up of the tongue, the pushing the broken down food now chyme towards the back of the mouth, pressing it against the soft palate. At this stage a bolus is formed.From here it is pushed into the throat,where it is pushed down the oesophagus by peristalsis.
Explanation:
Plato: Select the correct answer. Which strategy would help veterinarians avoid burnout? A. continuing education B. increasing involvement at the workplace C. meditation D. neglecting work duties
Answer:
i believe your answer is a
Explanation:
Which is the biggest disadvantage of using unipotent cells for medical
treatments?
what causes water to enter plant roots from the soil?
a. water concentration in root hairs and the soil are equal.
b.water concentration in root hairs and the xylem are equal.
c.water concentration in root hairs is higher than in the soil
d.water concentration in root hairs is lower than in the soil
Answer:
D
Explanation:
The cell sap is hypertonic to the soil therefore an osmotic gradient is formed and the roots therefore intake water
What causes water to enter plant roots from the soil is mainly because the concentration of water in the root hairs is lower than in the soil. The correct option would be D.
Water moves from the soil into the root by osmosis.Osmosis is the movement of water molecules from the region of high water potential or concentration to the region of low water potential or concentration.Hence, water will enters the plant roots from the soil because the water potential in the soil is more than that of the root airs.
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The majority of vaccines work by eliciting pathogen-specific antibodies that circulate in our bodies and protect us in the event that we are later exposed to that specific pathogen. For most viruses and bacterial toxins that we are vaccinated against, these pre-existing antibodies are protective because:
Answer:
Explanation:
Vaccines are penetrations into the body system that helps improve the immune system against specific diseases.
The vaccines act by imitating the disease causing organism i.e they resemble the disease causing organism this is because they have been made form strains of the weak or dead disease organism.
The body system is made to identify this toxins or disease organism as something strange that needs to be remove anytime it reoccurs in the cell when the vaccines are taken. Although the body sees vaccine as something harmful they do not actually cause the disease but are pointers to the disease causing organism.
Which is an example of the way matter cycles through the bodies of living
things?
A. Salmon swimming in a river
B. Salmon eating shrimp
C. Shrimp swimming in the ocean
D. People watching salmon
SUBMIT
Albumin is a protein that is found in eggs.
Which of the following describes the structure of albumin?
Choose 1 answer:
A molecule containing carbon, hydrogen, and oxygen in a 1:2:1 ratio
B
A chain of amino acids folded and twisted into a molecule
Three fatty acids attached to one glycerol molecule
D
A series of nitrogenous bases attached to a sugar-phosphate backbone
Answer:
B
Explanation:
Proteins are organic compounds containing carbon, hydrogen, oxygen, and nitrogen. Amino acids are compounds that consist of an R group, carboxylic acid end, and amino end. A chain of amino acids is referred to as a protein.
The statement 'a chain of amino acids folded and twisted into a molecule' describes the structure of albumin (Option B).
Proteins are macromolecules composed of a long sequential chain of amino acids linked together by peptide bonds.All proteins must be twisted and folded by a cellular mechanism called protein folding, which becomes an inactive polypeptide chain into a functionally active protein.Protein folding modifies the tridimensional (3D) conformation of a protein in order to become it into a biologically active molecule that performs specific functions (e.g., an enzyme with catalytic functions).In conclusion, the statement 'a chain of amino acids folded and twisted into a molecule' describes the structure of albumin (Option B).
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Different plants need different fertilizers .for example ,roses need a fertilizer with lots of potassium in it.Which fertilizer would you recommend a rose grower to use from above mentioned?
Answer:
A rose grower should use Muriate of potash, Potassium sulfate, Potassium nitrate, Sulfate potash magnesia, Kainite etc.
Plants combine carbon dioxide and water to make what
substance?
O A. Glucose
O B. Ammonia
O C. Peptide
O D. Nitrogen
SUBMIT
Answer:
A. glucose right good brilliant