Answer:
maintaning the essential internal parameters relatively constant is the phrase that best describes the process of homeostasis.
what is the difference between the spermatozoon and spermatogonium?
Answer:
Sperms are the male gametes produced in the seminiferous tubules of the testes. The main difference between spermatogenesis and spermiogenesis is that spermatogenesis is the formation of sperm cells whereas spermiogenesis is the maturation of the spermatids into sperm cells.
Pls give Brainliest!!
Starting with the basic building blocks, which is the correct order of levels of organization of complex organisms?
A. organ systems --> cells --> tissues --> organs
B. cells --> tissues --> organs --> organ systems
C. tissues --> organs --> organ systems --> cells
D. organs --> organ systems --> cells --> tissues
Answer:
A
Explanation:
Due in 1 minute please help
Answer
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Which of the following is most likely to be an energy source for the cells of a living thing?
А. DNA
B. enzymes
С. disaccharide
D. amino acids
The most likely to be an energy source for the cells of a living thing is a disaccharide (Option C).
A disaccharide is a carbohydrate composed of two monosaccharide units.
Cellular respiration refers to a series of metabolic reactions by which cells produce ATP, the energy coin of the cell.
Monosaccharides (e.g., glucose) represent the main source of energy used by cells during cellular respiration.
In conclusion, the most likely to be an energy source for the cells of a living thing is a disaccharide (Option C).
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SOMEONE PLZ HELP!!!!!!!!!!!
Answer:
B
Explanation:
it was a question I had last week on my test.
Answer:
endoplasmic reticulum (ER)
Explanation:
how do you think the system used to organized where people live is similar to how your body is organized?
In rigor mortis, muscle tissue becomes locked in position because myosin heads are tightly attached to neighboring actin thin filaments. This lock-up is prevented in living muscle because ordinarily myosin is rapidly displaced from the thin filament by:_________.A. binding of a new molecule of ATP B. hydrolysis of ATP C. release of ADP after ATP hydrolysis D. release of phosphate after ATP hyrdolysis
Answer:
The correct answer is option A. binding of a new molecule of ATP.
Explanation:
Actin and myosin are complementary filaments present in muscle, actin is thin and myosin is a thick filament, these two filaments are responsible for the movement by muscle contraction and relaxation. Actin and myosin head shows great affinity towards one another.
Myosin heads are tightly attached to neighboring actin thin filaments due to its affinity to actin, however, myosin at other pockets also show a huge affinity for ATP. If myosin is bound to actin the affinity for ATP is changed and if new ATP bounds to the empty pockets it changes the conformation of myosin and prevents lockup or binding of the actin-myosin protein.
explain movement of water in the root
Answer:
Water initially moves into the root hair cells by osmosis, because the mineral content of the cells is higher than that of the surrounding environment. Thus, a root pressure is established and extends into the microscopic tubes of the xylem.
Explanation:
An 8 year old girl is brought to your office by her mother, who tells you that the girl has been complaining of a sore throat for 3 days. Thinking that the girl was developing a cold, she kept her daughter home from school with the hope that she would get better. She has become worse in the past day, however, developing a fever of 103 degrees F, a headache, and complaining of abdominal pain. As you examine her throat, you see that in addition to red and enlarged tonsils, that there are white patches on them, and that there are swollen lymph glands on both sides of her neck.
Answer:
she has Strep throat or something like that
Explanation:
the Severity of strep throat can vary from person-to-person. The common symptoms are as follows:
Sudden high fever
Mild soreness in throat
Redness in throat with white patches
Headache
Chills
Loss of appetite
Cervical lymphadenopathy (swollen lymph nodes in the neck)
Swollen tonsils
Difficulty in swallowing food or water
Pain when swallowing
Nausea and vomiting is seen in younger children
Answer: Acute otitis media.
Explanation: This question is based on the opening section of Pirozzo and Del Mar (2001). They specifically say that "Acute otitis media is a disease of infancy and early childhood defined by the presence of inflammation and fluid in the middle ear and accompanied by at least 1 sign of acute illness." You can find more information here: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1275975/
In a typical mammalian cell, what is the average percentage of total cell weight for protein and dna?
Answer:Protein is evaluated at ≈55% of the cell dry weight, followed by RNA at ≈20%, Lipid at ≈10% and DNA at ≈3% (the rest being polysaccharides, metabolites, ions etc.).
Explanation:
A typical mammalian cell averages 18% protein and 0.25% DNA by weight composition.
According to research, a typical mammalian cell is made up of water, ions, and macromolecules such as proteins, lipids, DNA, RNA, carbohydrates, and some miscellaneous metabolites.
The water component of a typical mammalian cell is about 70%, 18% proteins, 1% inorganic ions, 3% small metabolites, 5% lipids, 0.25% DNA, 1.1% RNA, and 2% polysaccharides.
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HELP! time crunch!
"Describe the flow of blood through the human heart starting in the left atrium and ending in the left atrium."
in two or three sentences please...Thanks in advance!
Willing to give 40 points!
Answer:
Explanation:
The left atrium receives oxygen-rich blood from the lungs and pumps it to the left ventricle through the mitral valve. The left ventricle pumps the oxygen-rich blood through the aortic valve out to the rest of the body. pl give brainly
Which is greater 1,000 ml or 1,000 cm?
Answer:
Neither, they are equal.
1,000 cm3 = 1000 mL
please help me with this question:)
Answer:
Pokaryote is the right answer.
Answer:
C: Prokaryote
Explanation:
This is not an animal or plant cell
What causes this change in fur color?
High tide is occurring on the sides of the Earth that are_______.
A. -experiencing sunrise and sunset.
B. -closest to and farthest from the Sun.
C. -halfway between the Sun and the Moon.
D. -closest to and farthest from the Moon.
High tide is occurring on the sides of the Earth that are closest to and farthest from the Moon. The correct option is D.
What is high tide?When the sea or a river reaches its greatest level and moves the farthest up the beach or the bank, it is said to be at high tide.
The gravitational forces that try to pull the water away from the moon are resisted by the water that is travelling away from the moon.
On the far side of the Earth, where the moon's gravitational pull is weaker, inertia triumphs, the ocean swells, and high tide happens.
The rise and fall of the sea's surface on a regular basis is what tides, which start in the oceans, appear as as they move toward the coastlines.
High tide is when the wave's highest portion, or crest, reaches a specific area; low tide is when the wave's lowest portion, or trough, happens.
Thus, the correct option is D.
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The reaction shown below is known as what type of reaction?
Reactants → Products + Heat
А. activation
B. endothermic
c. enzymes
D. exothermic
If a cell in G1 has 20 chromosomes, then at the end of meiosis I there will be _________ chromosomes in each daughter cell, and __________ sister chromatids in each daughter cell.
Answer:
10 chromosomes
20 chromatids
Explanation:
Meiosis is the process by which sexually reproducing organisms produce gametes for sexual reproduction. Meiosis, which reduces the chromosomal number of the parent cell by half, occurs in two stages namely: meiosis I and meiosis II.
Meiosis I is where the actual reduction in chromosomal number takes place because homologous chromosomes are separated in this stage. For example, a cell in G1 that has 20 chromosomes will have 10 chromosomes in each daughter cell at the end of meiosis I.
Since, DNA replication occurs in the S-phase, sister chromatids are formed for each chromosome. Hence, there would be 20 sister chromatids joined together by a centromere at the end of meiosis I.
According to the graph, how many billions of US dollars were invested in sustainable energy in 2006?
a.
28
c.
71
b.
50
d.
0
Answer:
50
Explanation: :)
The creation of different breeds of dog by humans is an example of...
A) stabilizing selection
B) disruptive selection
C) artificial selection
D) sexual selection
Answer:
I believe it is artificial selection
Explanation:
i learned about this a little while ago lol
i need help on this please ASAP
Answer:
What's the question? Its not written here
Answer:
Where is the question?
Explanation:
Which two words are the closest antonyms?
Hint
А
Phenomenon and occurrence
B
Observe and determine
C
Sudden and gradual
D
Tremendous and powerful
Answer:
(B)
Explanation:
What was the result of using drainage blocks to keep water in the field level during the growing season?
Answer:
This question is incomplete
Explanation:
This question is incomplete. However, it should be noted that the idea of blocking the drainage, which could cause waterlogging (since the water will not be able to leave the field), is a type of irrigation that ensures there is sufficient amount of water for the plants to grow during a growing season. Although, some plants do not grow well in environments like this (in the case of waterlogging) because this environment lowers oxygen level in the root o the plant (caused by the water at the top of the soil).
What were the ancestors of mitochondria according to the endosymbiotic theory?
20 points
A. Aerobic eukaryotes
B. Aerobic bacteria
C. Anaerobic bacteria
D. Chloroplasts
Answer:
d is your answer
Explanation:
Ancestors of Mitochondria were aerobic bacteria, according to endosymbiotic theory.
What is endosymbiotic theory ?According to Lynn Margulis' endosymbiotic theory, mitochondria in eukaryotes are thought to have originated via an endosymbiotic connection with purple photosynthetic bacteria around 1.5 109 years ago. The endosymbiont, which had been captured, was subsequently transformed into a useful organelle bound by two membranes. Supporting data for the endosymbiont theory.
Prokaryotic cells and mitochondria are the same size. The DNA found in mitochondria is structurally identical to bacterial DNA. Similar to bacteria, mitochondria are self-replicating cells divide by binary fission Two membranes enclose mitochondria, and the inner membrane is structurally very similar to that of bacteria.
Therefore, aerobic bacteria are the ancestors of mitochondria.
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A repressor prevents
a. translation from occurring.
b. ribosomes from binding to mRNA
c. transcription factors from binding to DNA
Which process creates two daughter cells with identical genetic material?
A. interphase
B. intercellular communication
C. mitosis
D. meiosis
Answer:
c
Explanation:
who cares
Suppose we stock a pond with 100 fish and note that the population doubles in the first year (with no harvesting), but after a number of years, the population stabilizes at what we think must be the carrying capacity of the pond: 2,000 fish. Growth seems to have followed a logistic curve. a. What population size should be maintained to achieve maximum yield, and what would be the maximum sustainable fish yield? b. If the population is maintained at 1,500 fish, what would be the sustainable yield?
Answer:
Explanation:
From the given information,
The first process is to determine the initial growth rate by using the formula:
[tex]R_o = \dfrac{In(2)}{t_d}[/tex]
where;
The initial growth rate(constant) = [tex]R_o[/tex] ; &
the doubling time = [tex]t_d[/tex] = 1 year
[tex]R_o = \dfrac{In(2)}{1 \ year}[/tex]
[tex]R_o[/tex] = 0.693 / year
Now, we move up to the net stage to find the growth constant by using the formula:
[tex]r = \dfrac{R_o}{(1 - \dfrac{N_o}{K})}[/tex]
where;
[tex]N_o[/tex] = population of fish in the pond = 100
[tex]R_o[/tex] = The initial growth rate(constant) = 0.693 /year
K = carrying capacity = 2000
Then;
[tex]r = \dfrac{0.693 \ /year }{(1 - \dfrac{100}{2000})}[/tex]
[tex]r = \dfrac{0.693 \ /year }{(1 - 0.05)}[/tex]
[tex]r = \dfrac{0.693 \ /year }{(0.95)}[/tex]
r = 0.730 / year
a)
Now, the maximum yield can be evaluated by using the expression:
[tex]= \dfrac{rk}{4}[/tex]
[tex]= \dfrac{0.730 \times 2000}{4}[/tex]
= 365 fish per year
Also, the maximum sustainable yield is said to be half of the carrying capacity suppose that the population growth obeys logistic curve;
i.e.
[tex]N' = \dfrac{1}{2} \times 2000[/tex]
N' = 1000 fish
b)
If the population is maintained at 1500 fish;
The sustainable yield can be calculated by using the formula:
The Sustainable yield = [tex]r\times N (1 - \dfrac{N}{K})[/tex]
The Sustainable yield = [tex](0.730/ year ) (1500) (1 - \dfrac{1500}{2000})[/tex]
The Sustainable yield = 1095 × 0.25
The Sustainable yield = 273.75 fish per year
The Sustainable yield ≅ 274 fish per year
Population size should be maintained to achieve maximum yield and Sustainable yield if population is maintained at 1,500 fish are 364.7 , 273.525 fish per year
Sustainable yield:Given that;
Stock in start = 100 fish
Double in 1 year
Capacity of pond = 2000 fish
Find:
Population size should be maintained to achieve maximum yield
Sustainable yield if population is maintained at 1,500 fish
Computation:
Growth rate = ln₂ / 1
Growth rate = 0.693 per year
With no growth constraint r = [tex]\frac{0.693}{1-\frac{100}{2000} }[/tex]
With no growth constraint r = 0.7294 per year
A. Population size should be maintained to achieve maximum yield = [tex]\frac{0.7294 \times 2000}{4}[/tex]
Population size should be maintained to achieve maximum yield = 364.7 fish per year
B. Sustainable yield if population is maintained at 1,500 fish = [tex][(0.7294))(1500)][1-\frac{1500}{2000} ][/tex]
Sustainable yield if population is maintained at 1,500 fish = 273.525 fish per year
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Some individuals can develop kidney failure after consuming fava beans. What is the biochemical rationale for this observation?A. A deficiency of glucose-6-phosphatase that resulted in failure to synthesize essential red cell membrane proteins.B. A deficiency of glucose-6-phosphate dehydrogenase that resulted in failure to maintain glutathione in a state that prevents destructive lysis of the red blood cell.C. A deficiency of transketolase that resulted in the failure to provide ribose for the DNA and RNA needed to repair red cells.D. A deficiency of transaldolase that resulted in the failure to maintain glycolysis in the red cells. E. A deficiency of sedoheptulose that resulted in the failure to maintain the integrity of the red cells.
The correct answer to the question is option B
A deficiency of glucose-6-phosphate dehydrogenase that resulted in failure to maintain glutathione in a state that prevents destructive lysis of the red blood cell.
The deficiency of Glucose 6 phosphate dehydrogenase is a genetic disorder,when certain foods are consumed,the deficiency symptom to the enzyme is triggered and one of such food is Fava beans.
in Fava beans, Vicine is found, and this Vicine is an alkaloid glycoside.
Vicine is an oxidant,and it is toxic by causing disease favisim in individuals.The individual being affected are the ones that have hereditary loss of the Glucose 6 phosphate dehydrogenase enzyme.
But favisim only occurs when Fava beans is ingested fresh, that is without cooking it.
Following this,there is the development of acute intravascular hemolysis within 4-24hours after the ingestion of the Fava beans,there might also be a fall in the hemoglobin content of the blood and this may result in fatal condition.
But in cases that are acute, that is case of hemolysis, blood transfusion is vital and also in the case is kidney failure, dialysis must be done.
The reason why blood transfusion is very necessary is because the blood transfused may not have red blood cells that are deficient of Glucose 6 phosphate dehydrogenase,also the cells can have normal lifespan in the blood circulation of the recipient.
This Glucose 6 phosphate dehydrogenase is vital because it is a metabolic enzyme of Pentose phosphate pathway and it is also important for the metabolism of red blood cells.It also gives red blood cells protection from oxygen species that are harmful and reactive.
Option A is a metabolic disease that is
inherited which results in accumulation of glycogen and fat in liver.
Option C is as a result of deficiency in thiamine and malnutrition.
Option D is as a result of mutation in transaldolase gene.
Option E is as a result of genetic mutation.
This part of the respiratory system prevents food from entering your trachea.
A. Mouth
B. Epiglottis
C. Bronchioles
D. Nose
Answer:
the answer is epiglottis in the respiratory system
The process by which a modified stem or root of a parent plant grows offspring that remain attached is called(1 point)
A. vegetative reproduction.
B. fragmentation.
C. binary fission.
D. tuber reproduction.
Answer:
C
Explanation:
The process by which a modified stem or root of a parent plant grows offspring that remain attached is called vegetative reproduction.
Which of these zones of the ocean is deepest?
A. Abyssopelagic
B. Epipelagic
C.Hadalpelagic
D. Bathypelagic
hadalpelagic is the zone of the ocean is deepest.