What function do most of the stem cells in adults serve?
A. Differentiating into any type of cell
B. Repairing damaged DNA
C. Replacing damaged tissue
D. Growing new organs
Describe the factors that impact the ability for a skeletal muscle fiber to reach tetany. How do these factors influence the difference in twitch force as the muscle moves from a single twitch to a state of tetanus?
Answer:
Tetanus is a very aggressive disease generated by clostridium tetani, this clostridium, which is a bactera, releases a toxin that generates tetanization of the muscle, where it contracts massively and simultaneously, remaining over time, similar to a contracture and very different from synchronized and sporadic contraction that requires locomotion or other physiological contractions.
The Tetanus toxin acts as a toxin for the muscle cells that make up the skeletal muscle fiber, which unfortunately leads to the progressive death of the patient who suffers from it.
In simple words, tetanus generates muscle spasms that are maintained over time, preventing the function of the organ, that is, of the muscles, immobilizing them and prohibiting them from other movements.
Patients who reach the target are affected by the diaphragm that contributes to respiration, therefore many of the tetanized patients die in a similar way to suffocation due to a constant spasm of the diaphragm.
Explanation:
The bacterium is found in sporulated form on the ground or on oxidized surfaces, that is why it is important to sterilize oxidized elements or to decontaminate them, and to apply the antithetical vaccine, which is what prevents them from suffering from said pathology.
In simple words, the great differences between a physiological contraction of muscle fibers and tetanized contractions is the time in which they occur, since tetanization lasts over time and physiological does not, and the power of contraction in tetanization is greater. , since the toxin of said bacterium potentiates the ionic channels thus generating an increase in the contractile capacity of the muscle fiber compared to the physiological or health situation.
In order for the toxin to have an effect, the bacteria must leave its sporulated state, release the toxin and the wound must be deep enough for the bacteria to enter the bloodstream, after which the toxin enters the myocytes that are muscle fiber cells intensifying muscle spasms by opening calcium channels in a longer period of time, calcium channels are those found in the REL of myocytes, which act as a reserve for this ion, triggering so that the Z lines of the sarcomeros definitively approach spasmodically by shortening the length of the sarcomero.
Pleaseee help me out.
The T allele codes for tall stems in pea plants and the t allele codes for short stems. If T is
dominant and t recessive, what percentage of the offspring would you expect to have each
phenotype from a cross of Tt x tt?
a. 75**
tall and 25% short
b. 25% tall and 75% short
C. 50% tall and 50% short
d. 25% tall and 25% short
Answer:
50% tall and 50% short.
Explanation:
T t
t Tt tt
t Tt tt
If you were standing at Earth's geographic North Pole and holding a compass, the magnetic north pole of the compass needle would be pointing _____. A. eastward B. westward C. toward the geographic North Pole D. toward the geographic South Pole
Answer:
C
Explanation:
this is because of the magnetic property of the rocks beneath the north pole , hence the magnetic north will always point towards where the magnetic north of the rocks are
Are enzymes in saliva a example of a structural adaption or physiological?
Answer:
structural adaptation
Answer:
Adaptational
Explanation:
It needs to adapt to the different variety of food and drinks.
Sheila weighs 60 kg and is riding a bike. Her momentum on the bike is 340 kg • m/s. The bike hits a rock, which stops it completely and throws Sheila forward onto the pavement. If there is no net force on the system, what is Sheila’s velocity immediately after she is thrown from the bike?
Answer:
5.7 m/s
Explanation:
The computation of Sheila 's velocity right after she gets thrown out of the bike is shown below:
1) The Physical principle: conservation of momentum.
If there is no net external force operating on a system, so the system's total momentum is conserved
The momentum, p, is a vector magnitude that is determined as the product of the mass by the velocity:
P = mv.
2) Taking into account therefore that there is no net force on the device, Sheila and the momentum of the bike are the identical pre and post collision.
Based on this, the calculation is as follows
Momentum before the collision:
[tex]P_1 = (mass\ of\ Sheila + mass\ of\ the\ bike) \times velocity[/tex]
[tex]P_1 = (60kg + m) \times v_1[/tex]
= 340 kg m/s
Now Momentum after the collision:
[tex]P_2 = mass\ of\ sheila \times velocity\ of\ Sheila + mass\ of\ the\ bike \times velocity\ of\ the\ bike[/tex]
[tex]P_2 = 60kg \times v_2 + m \times 0 = 60kg \times v_2[/tex]
[tex]P_1 = P_2[/tex]
[tex]= (60kg + m) \times v_1[/tex]
[tex]= 60kg \times v_2[/tex]
[tex]= 340 kg .\ m/s[/tex]
[tex]= 60kg \times v_2[/tex]
[tex]v_2 = \frac{340\ kg .\ m/s }{60\ kg}[/tex]
= 5.7 m/s
The velocity of Sheila immediately after she is thrown from the bike is 5.67 m/s.
The given parameters;
mass of Sheila, m = 60 kgmomentum of Sheila, P = 340 kg.m/sThe velocity of Sheila immediately after she is thrown from the bike is calculated as follows;
P = mv
where;
v is the velocity Sheila
[tex]v = \frac{P}{m} \\\\v = \frac{340}{60} \\\\v = 5.67 \ m/s[/tex]
Thus, the velocity of Sheila immediately after she is thrown from the bike is 5.67 m/s.
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A colorimeter is an instrument used for chemical analysis by comparing a liquid’s color with standard colors. In an experiment, a scientist used two colorimeters and noted the readings. The first colorimeter showed consistent readings that were five points lower than the actual reading. The second colorimeter provided readings that were the same as the actual reading. Which two statements are implications of these readings?
1). The first colorimeter is reliable but not valid.
2). The second colorimeter is valid and reliable.
3). Both the colorimeters are reliable and valid.
4). The readings of the first colorimeter can be used without repeating the experiment.
5). The readings of the second colorimeter aren’t reliable and can’t be used for the experiment.
Answer:
The correct answers are option A and B
Explanation:
The first colorimeter is reliable because the the reading it is showing is same for all the times the experiment is done. Though the result obtained is wrong but it is reliable.
The second colorimeter is valid and reliable because it is showing the correct results again and again. This is valid result as it is giving the result same as that of actual readings.
DNA: TTA CGC AAC TGG CTA ATT
mRNA: AAU GCG UGA CCG AUU AAC
Identify the type of mutation that occurred in the sequence above and evaluate the significance of these changes. (Will it have any problems in protein synthesis?)
Hint: 1st determine if it was copied to mRNA correctly. When you find the error, that is the mutation. 2nd use the chart if a different amino acid is created, this will determine if it will affect protein synthesis.
Answer:
See the answer below.
Explanation:
The correct mRNA sequence from the DNA according to the base pairing rule should be:
AAU GCG UUG ACC GAU UAA
Instead of:
AAU GCG UGA CCG AUU AAC
This thus means that some of the nucleotide bases have been wrongly substituted.
The most important change is the codon 'UUG' becoming 'UGA', while the former codes for the amino acid leucine, the latter represents a stop codon. A stop codon will result in a non-functional or defective protein.
Hence, the type of mutation is nonsense mutation which results in a sudden cessation of protein synthesis as a result of a codon being prematurely changed to a stop codon.
The significance of this kind of mutation is that a defective on non-functional protein will result which will have a serious phenotypic implication in organisms.
A researcher investigates a recently discovered species of plant. The plant has vascular tissues and exhibits a sporophyte and a gametophyte
generation, but lacks seeds. How should the researcher classify the plant?
Answer;
pteridophyte
Explanation;
Pteridophyte are vascular plants in the phylum plants that reproduce by releasing spores rather than seeds.Other characteristics of pteridophyte includes;
They show alternation of generations, that is the sporophyte generation and gametophyte generation are observed.Sporophytes has true roots, stem and leavesSporangia are produced in groups on sporophyllsRashida doesn’t think that skepticism should play an important role in the scientific process. She says that skepticism interferes with scientific consensus. Which statement best describes Rashida’s conclusion?
It is incorrect because skepticism helps scientists recognize when ideas are not supported by evidence.
It is correct because skepticism prevents the acceptance of creative ideas and new discoveries.
It is correct because skepticism prevents scientists from testing new ideas and communicating with other scientists.
It is incorrect because skepticism leads to the acceptance of new ideas, which can eventually gain scientific consensus.
Answer: b
Explanation: sorry if im wrong
In the reaction 6CO2 + 6H 20+C6H 120 6 + 60 2 carbon dioxide is one of the
O products.
enzymes.
elements.
catalysts.
reactants.
Is it recommended for most adults that carbohydrates make up 45-65% of their diet, proteins make up 10-35% of their diet, and fats make up 20-30% of their diet. Does Deb’s diet mee these recommendations? Support your statement with calculations
Answer:No her diet does not. She is currently eating 128.52 calories each for protein, 289.17 calories from fat, and 1413.44 calories from carbs. This means she is consuming 6.6% of her diet from protein, 14.9%, of her diet from fat, and 73.2% of her diet from carbs.
Explanation:
Why is this important to make new DNA?
Answer: DNA is vital for all living beings – even plants. It is important for inheritance, coding for proteins and the genetic instruction guide for life and its processes. DNA holds the instructions for an organism's or each cell's development and reproduction and ultimately death. so it is important
Which would have more humus a desert or a forest
Answer:
a forest
Explanation:
thinks don't really grow in the desert
A Veterinary doctor examined a sick cow. He examined that the cow showed Debilitation and weakness. What would the cow suffer from?
Answer:
Fat Cow Syndrome
Explanation:
SHORT ANSWER:
Explain the function of 2 important cell organelles that play role in protein synthesis
Answer:
Ribosomes and Endoplasmic Reticulum
Ribosomes are the organelles responsible for protein translation and are composed of ribosomal RNA (rRNA) and proteins. ... If the protein in question is a cytoplasmic protein that will not be transported to the cell membrane or secreted, it will be translated on a cytoplasmic ribosome.
hope it helps : D
Explanation:
1.
Which list below describes the next steps of evaporated water through the water cycle? (3 points)
Condensation, precipitation, runoff, ocean storage
Transpiration, condensation, precipitation, ocean storage
Precipitation, condensation, runoff, groundwater
Evaporation, condensation, precipitation, runoff
2.
What is a possible cost of using nonrenewable energy resources? (3 points)
Greenhouse gases
Less water pollution
Sustainable energy
Costs more money
3.
What is the benefit of recycling plastic and paper products to wildlife? (3 points)
Less expense
Clean fuel
Sustainable energy
Fewer landfills
4.
What is the next phase of the carbon cycle for the carbon source labeled A? (3 points)
Label A shows a collection of coal, oil and gas. Label B shows a collection of trees and vegetation. Label C shows sky and open atmosphere.
Photosynthesis
Ocean storage
Fossil fuel emissions
Transpiration
5.
Where is the last storage location for melted snow? (3 points)
Rivers
Ocean
Streams
Mountains
6.
How can the carbon stored in plants reach the atmosphere? (3 points)
Evaporation
Diffusion
Photosynthesis
Cellular Respiration
7.
Which statement best describes the role of plants in the water and carbon cycles? (3 points)
Plants release oxygen when they decompose take in oxygen for photosynthesis.
Plants take in carbon dioxide during photosynthesis and absorb water through their leaves and roots.
Plants take in oxygen during photosynthesis and absorb carbon dioxide through their leaves and roots.
Plants use oxygen to perform photosynthesis and release carbon dioxide as a by-product.
Answer:
1. d
2. a
3. d
4. probably c
5. b
6. d
7. b
Explanation: Got straight A's in all my biology classes, hope this helps!
In a sample of double-stranded DNA, 30% of the nitrogenous bases are adenine (A).
What percentage of the nitrogenous bases in the sample are thymine (T)?
Choose 1 answer:
A. 20%
B. 30%
C. 60%
D. 70%
Answer:
30% thymine
Explanation:
If 30% of Adenine is present, it would be reasonable to assume that 30% of Thymine will be present, as the ratio between the two complementary nitrogenous bases will be roughly equal. Therefore, that leaves us with 40% between Cytosine and Guanine.
23 POINTS PLS HELP
Use complete sentences to explain how the mass of oxygen is conserved during cellular respiration.
Answer:here you go
Explanation:
where does the independent variable go on a graph
Answer:
SCIENTISTS like to say that the “independent” variable goes on the x-axis (the bottom, horizontal one) and the “dependent” variable goes on the y-axis (the left side, vertical one).
HOPE IT HELPS
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Explanation:
Identify the characteristic that allows the cell membrane to regulate which substances enter and exit the cell. nonpolar selectively fluid selectively permeable flexible
Explanation:
The answer is that all cells are "semi-permeable,"
this allows cells to take in only the nutrients needed...
what causes ocean tides to reach higher up on a shore at certain of day than at others?
Answer:
Most tides are semidiurnal, which means they take place twice a day. For example, when an area covered by the ocean faces the moon, the moon's gravitational force on the water causes a high high tide. As the Earth rotates, that area moves away from the moon's influence and the tide ebbs.
Explanation:
Answer:
D. The moons gravity and Earth’s rotation
Explanation:
The compass has advanced dramatically over the years, evolving into a
Global Positioning System (GPS). The GPS is a device that is simple to use
and gives a lot of information on your position.
Which is a positive effect of the technological advance of going from a
compass to a GPS?
O A. The GPS uses less electricity.
B. The GPS gives more accurate information
O C. The GPS is less expensive,
D. The GPS is easier to manufacture,
Answer: B
Explanation:
The GPS gives more accurate information .
What is GPS?The Global Positioning System (GPS) is a U.S.-owned utility that provides users with positioning, navigation, and timing (PNT) services.
What are the 3 types of GPS?Three types of GPS systems are:
Street navigation systemsSports GPS systems Phones with GPSHence, A is correct option
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Lysosomal storage diseases (LSDs) are a group of rare and inherited genetic disorders in which some part of the lysosome does not function properly, causing the accumulation of toxic substances in the cell and ultimately, cell death. What would be the most likely explanation as to why the lysosomes of someone with this disease are not functioning properly?
A. The enzymes of the lysosome are beginning to break down the DNA of the cell.
B. The enzymes of the lysosome are not breaking down enough toxic material.
C. The enzymes of the lysosome are breaking down too much toxic material.
D. The enzymes of the lysosome are beginning to break down the ribosomes of the cell.
Answer: The enzymes of the lysosome are not breaking down enough toxic material.
Explanation:
Lysosomal storage diseases (LSDs) are a group of rare and inherited genetic disorders in which some part of the lysosome does not function properly, and this is due to the enzymes of the lysosome not breaking down enough toxic material in Option B.
What is the significance of lysosomal storage diseases?Lysosomes are cell organelles that accumulate the cell's toxins or those that enter the cell from the outside (some bacterial particles, for example) and are broken down by the acidic pH of the lysosomes and the enzymes to keep the cell functioning properly. In the case of this disease, it does not work and damages the cell.
Hence, lysosomal storage diseases (LSDs) are a group of rare and inherited genetic disorders in which some part of the lysosome does not function properly, and this is due to the enzymes of the lysosome not breaking down enough toxic material in Option B.
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Which molecule would be the most affected by limited nitrogen?
myofibrillar proteins in muscle
glucose molecules in starch
fat molecules surrounding organs
cellulose molecules in plant cell walls
Myofibrillar proteins in muscle would be the most affected by limited nitrogen.
What are proteins?Proteins are essential biomolecules composed of linear sequences of building blocks called amino acids.
The amino acids are composed of nitrogen (N), carbon (C), hydrogen (H) and oxygen (O), and often also sulfur (S).
Nitrogen is, therefore, a fundamental component of all amino acids, which form proteins such as enzymes, peptide hormones, etc.
In conclusion, myofibrillar proteins in muscle would be the most affected by limited nitrogen.
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The nucleus in both plant and animal cells “specializes” the cells so they can do different things- for example, a liver cell or a muscle cell do different things. Thinking about plants or trees, what special functions might different cells in a tree or plant do?
Answer:
od21xef3
Explanation:ewwe
How can selective breeding "force" evolution
to occur?
Answer:
Domestication accounts for a significant influence on the evolution of a species. ... Through selective breeding, we may have influenced aid to the survival of a species. Adversely, we may be leading some species to negative results. Indeed, great changes have been implemented because of selective breeding.
Which formula is a hydrocarbon?
O H20
O CaCl2
CH4
CO2
Nach
Answer:
None of tbe option is correct.
Explanation:
Hydrocarbons have genral formula
Cn(H2O)n
n is the number of carbon atoms.
Question 11 (1 point)
Which of the following is not the name of a taxon?
Order
O Family
O Class
O Association
What is produced during the photosynthesis process?
A. Chloroplasts
B. Carbon Dioxide
C. Sugar
Answer:
Sugar
Explanation:
Photosynthesis is a process that certain organisms undergo. Plants, algae, and certain bacteria use this process to produce their own food. These organisms are called producers or autotrophs.
The equation for photosynthesis is:
carbon dioxide + water + light energy —-> glucose + oxygen
The plants turn carbon dioxide, water, and light energy from the sun into glucose and oxygen. The glucose, or sugar, becomes the food for the plant. The oxygen is the waste product.
The question asks us what is produced during photosynthesis.
Chloroplasts are not produced, but they are where photosynthesis takes place. Carbon dioxide is not produced, but it is used in the process. The correct answer is sugar. Sugar is produced, and it is the food for the organism.
