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The exchange of matter or substances between the cell and its environment is dynamic as it varies in direction and rate as per the requirements of the cell. Thus,a cell attains a stead -state wherein the internal conditions of the cell remain constant. Hence, cell is considered to be a open dynamic system
Related Questions
A group of blology students tests the growth of bacteria under different conditions. The students apply the same amount of bacteria to identical
Petri dishes enriched with nutrients, then place each plate at a different temperature. The bacteria are allowed to grow for three days, after
which the number of bacterial colonies on each plate is counted. What is the dependent variable in this experiment?
ФА
the nutrient type present in the Petri dishes
the time of day that the experiment is performed
ОВ.
the number of bacterial colonies after three days
OD
the temperature at which the colonies grew.
Answers
Answer:
A
Explanation:
only viable answer is a bc b and c are clearly stated different otherwise in the question. B would be ur unknown
Please help me out with this.
Answers
The cell wall protects the cell it acts like a barrier
12. If Mr. Rauch wants to create an African violet with variegated foliage, then what must be true about the plant he chooses to use as the seed parent (female)
Answers
To create an African Violet whose leaves have various colors, Mr. Rauch will have to use seed from a female parent whose foliage is also variegated because, in flowers, variegation of foliage is inherited from the female parent.
What is an African Violet?African Violets are a type of plant that is very popular for decorating the house.
They are easy to maintain and bloom at least 10 times in a year. It's scientific name is Genus Saintpaulia.
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What types of chemical reactions are the following?
Column A
1.
Al + + GaP → Ga + AlP
:
Al + + GaP → Ga + AlP
2.
2 Mg + O2 → 2 MgO
:
2 Mg + O2 → 2 MgO
3.
MgO + BeSe → BeO + MgSe
:
MgO + BeSe → BeO + MgSe
4.
CH4 + 2O2 → CO2 + 2H2O
:
e
CH4 + 2O2 → CO2 + 2H2O
5.
2 NaCl → Na + Cl2
:
2 NaCl → Na + Cl2
Answers
The type of reaction can be deduced from observing the changes in the reaction from left to right.
In the first case, we can see that the aluminium atom replaced Ga from left to right to yield AlP. This reaction is a single replacement reaction.
In the second case, we can see that the two species combined together to yield a single product. Hence, it is a combination reaction.
In the third reaction, We can see that the anions in MgO and BeSe exchanged cation partners from left to right. This means that this is a double replacement reaction.
In the fourth reaction, we can see that methane reacts with oxygen. This is a combustion reaction.
In the fifth reaction, we can see that the NaCl was broken up into its components. This is a decomposition reaction.
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Answer:
1. Al + + GaP → Ga + AlP - Single Replacement
2. 2 Mg + O2 → 2 MgO - Synthesis
3. MgO + BeSe → BeO + MgSe - Double Replacement
4. CH4 + 2O2 → CO2 + 2H2O - Combustion
5. 2 NaCl → Na + Cl2 - Decomposition
All three types of worms that undergo asexual reproduction use which process?
binary fission
O budding
fragmentation
O spore formation
Answers
Answer:
Budding is the answer to this.
Answer:
budding
Explanation:
Two porcupines have different parents. One has thick bristles, while the other has thin bristles.Why do they have different bristle thickness?
Answers
They have different bristles because they have different versions of genes that they inherit from their parents, given that these porcupines have different parents. These genes instruct or determine the thickness of their bristles.
Which part of plate tectonics do the pieces of paper represent? Convection currents heat from Earth's core _____ plate boundaries
Which part of plate tectonics does the movement of food coloring represent? _____ heat from Earth's core Earth's plates plate boundaries
Which part of plate tectonics does the candle represent? Convection currents _____ Earth's plates plate boundaries
Answers
No aspect of plate tectonics is represented by the bits of paper. They could be used in a lesson to demonstrate how tectonic plates move, but they are not part of the real Earth system.
In plate tectonics, what role do convection currents play?Convection currents in the planet's fluid, molten core cause the Earth's rigid tectonic plates to move. Seafloor spreading is the process of tectonic plates moving apart in regions where convection currents flow up towards the surface of the crust.
What drives the Earth's convection currents?Convection currents are heat-driven cycles that occur in the atmosphere, ocean, and mantle. They result from a differential in temperature, frequently as a result of different closeness to a heat source.
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Most articles pass right through the atom, this means that most of the atom is
Answers
Most articles pass right through the atom, this means that most of the atom is an empty space.
What is an atom?An atom is described as a particle that consists of a nucleus of protons and neutrons surrounded by a cloud of electrons.
Protons and neutrons make up the core nucleus of an atom, which is encircled by an electron cloud. In relation to the size of the atom as a whole, the nucleus is exceedingly small.
As a result, the electrons surrounding the nucleus are the primary target of interactions when particles or even light pass through an atom. The majority of the atom's remaining space, which includes the nucleus, is vacant.
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N a culture of bacteria, a sample is taken at 10:00am and contains 1000 cells per ml. A second sample at 8:00pm has 10,000 cells per ml. What is the generation time ?
Answers
The generation time of the bacteria in the following culture is approximately 3.01 hours.
To determine the generation time of bacteria, we can use the formula:
Generation time (t) = (Time elapsed (T) / Number of generations (n))
In this case, we have a time difference of 10 hours between the two samples.
To calculate the number of generations, we can use the formula:
Number of generations (n) = log(N₂ / N₁) / log(2)
Where N₂ is the final cell count (10,000 cells/ml) and N₁ is the initial cell count (1,000 cells/ml).
Plugging in the values, we get:
Number of generations (n) = log(10,000 / 1,000) / log(2) ≈ 3.32
Now, we can calculate the generation time:
Generation time (t) = Time elapsed (T) / Number of generations (n)
Generation time (t) = 10 hours / 3.32 ≈ 3.01 hours
Therefore, the generation time of the bacteria in this culture is approximately 3.01 hours.
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when scientists have made many observations and collected existing data, they suggest a possible explanation for what they have seen and recorded. this explanation, called a hypothesis, is a statement that both explains their observations and data and can be tested. hypothesizing is a very important step in scientific investigations. a statement is testable if evidence can be collected that either supports or disproves it. a hypothesis may be shown to be wrong, but it can never be proved true beyond all doubt. it can only be supported by evidence. at any time, new data might indicate that a previously accepted hypothesis does not hold true in all instances. scientists often must refine and revise their original hypotheses—or even discard them—as they uncover new evidence. to test a hypothesis, scientists make a prediction that logically follows from the hypothesis. a prediction is a statement made in advance that states the results that will be obtained from testing a hypothesis, if the hypothesis is true. a prediction most often takes the form of an “if-then” statement. a hypothesis is often tested by carrying out an experiment. experimenting is the process of testing a hypothesis and its predictions by gathering data under controlled conditions.
Question
1- What key vocabulary terms are contained in this passage?
2- give the meaning of these terms.
Answers
The chapter gives definitions for essential terminology used in scientific inquiry, such as hypothesis, testable, evidence, revision, prediction, and experiment, as well as information on their relevance.
What might possibly account for an observation that can be verified by science?A hypothesis is a speculative explanation that can be verified by more research. A hypothesis is a well-supported explanation for the findings.
What is an observation's hypothesis?After making an observation, a scientist tries to explain what they have noticed. An explanation for an observation is a hypothesis. Always take into account at least one alternative. The alternative theory postulates that a certain cause leads to a particular effect.
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Which of the following are ways in which protein lateral mobility can be restricted in the plasma membrane?
[Multiple answers]
A) Proteins can be tethered to the cell cortex inside the cell.
B) Proteins can be tethered to the extracellular matrix molecules outside the cell.
C) Proteins can be tethered to proteins on the surface of another cell.
D) Diffusion barriers can restrict proteins to a particular membrane domain.
E) None of the above
Answers
Proteins are attached to the extracellular matrix, the cell cortex, and obstacles such tight junctions.
What four purposes serve the plasma membrane?Identification, communication, control of solute exchange across the membrane, and separation of the nucleus from the surrounding environment are the four primary roles of the plasma membrane.
What is a simple definition of a plasma membrane?The membrane that encloses a cell's organelles and serves as a partition between them and the outside world is referred to as the plasma membrane. Every live cell has a thin membrane called the plasma membrane that surrounds it and isolates it from its surroundings.
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2. dependence problems.
narcotic
illegal drug
Answers
narcotic are illegal drugs is a true statement.
Option A is correct
What are narcotic?The term narcotic originally referred medically to any psychoactive compound with numbing or paralyzing properties
Chemicals with an intense physiological effect, such as drugs and psychoactive chemicals, modify brain function and momentarily affect perception, mood, and feelings.
Due to their detrimental effects on the body and human health, drugs are outlawed in the majority of nations around the world. Heroin and cocaine, which are deadly narcotics, cause the most severe addiction.
Drug dependence results in both physical and mental dependence.
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Complete question:
. Narcotics are illegal drugs
A. O True
B. O False
What organisms went extinct in the Carboniferous period
Answers
Answer: Some benthic organisms that were common to early and middle Paleozoic times began to decline during the Carboniferous. These included the trilobites (which became extinct at the end of the Permian), rugose corals, and sponges. The pelagic, or water column, environment was inhabited by a profusion of cephalopods.
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What happens to certain nutrient molecules after they pass into muscle cells?
A.
They are replicated in the nucleus
B.
They are acted on by enzymes and release the energy they contain.
c.
They are changed into tissues and organs in the cytoplasm.
D.
They enter chloroplasts, where they can absorb light energy.
Submit Answer
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Answers
Answer:
B. They are acted on by enzymes and release the energy they contain.
Explanation:
Muscles need energy to function thus these molecules make their way into muscles where enzymes act on them to release the energy, energy will likely be ATP.
Enzymes can speed up chemical reactions because they are able to: _____________
a. lower the activation energy needed for the reaction to proceed.
b. raise the activation energy needed for the reaction to proceed.
c. increase the temperature causing the reaction to proceed.
d. create more energy needed for the reaction to happen
Answers
Answer:
increase the temperature causing the reaction to proceed
Oxygen-rich blood is carried through pulmonary arteries from the lungs to the heart?
Answers
It is false that oxygen-rich blood is carried through pulmonary arteries from the lungs to the heart.
What is pulmonary artery?The two principal arteries leaving the right ventricle of the heart are known as the pulmonary arteries. Low-oxygen blood is seen in this lower chamber of the heart. This blood travels to the lungs through the pulmonary arteries.
The middle mediastinum contains the main pulmonary artery, as well as the pulmonary arteries that follow on the right and left. They emerge from the four chambered heart's right ventricle and carry blood to the lungs.
Right side of heart sends deoxygenated blood to pulmonary artery. Nature has made it such that this blood reaches the lungs where carbon dioxide can be released and then oxygen can be loaded.
It is true that all arteries convey oxygenated blood, with the exception of the pulmonary artery.
Thus, the given statement is false.
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Meiosis Fill the blancs
1)During Prophase I homologous chromosomes form ___________ consisting of _______ chromatids.
2) _______________ is the process of ___________ chromosomes exchanging segments
3)Homologous chromosomes move to the middle of the cell during __________ of Meiosis
4)_________ _____________ results from the random alignment of chromosomes during Metaphase I of meiosis
Answers
Answer:
1) During Prophase I homologous chromosomes form *tetrads* consisting of *sister* chromatids.
2) *Crossing-over* is the process of *homologous* chromosomes exchanging segments.
3) Homologous chromosomes move to the middle of the cell during *Metaphase* of Meiosis.
4) *Genetic diversity* results from the random alignment of chromosomes during Metaphase I of Meiosis.
Explanation:
example of Exogeneous sources of infection
Answers
Answer:In exogenous infection, no microbial carriage precedes colonization and infection. In endogenous infection, infection is preceded by oropharyngeal or GI carriage.
Explanation:
How does coral reef damage negatively affect the land? A. There is decreased ocean acidityB. There is more land erosionC. There is a loss of cures D. There is more biodiversity
Answers
Coral reefs offer a physical protection for shorelines, preventing storms, floods and even erosion. When it`s damaged, the land is vulnerable to all those events and many other ones. The answer is letter B.
92ml 3.0 fl oz what is the ratio
Answers
The ratio between 92 mL and 3.0 fl oz is 46 : 44, or it can be further simplified to 23 : 22.
To find the ratio between 92 mL and 3.0 fl oz, we need to convert the units to a common measurement. Let's convert 3.0 fl oz to milliliters (mL).
1 fluid ounce (fl oz) is equal to approximately 29.5735 milliliters (mL).
Therefore, 3.0 fl oz is equal to 3.0 * 29.5735 = 88.72 mL (rounded to two decimal places).
Now we can express the ratio between 92 mL and 88.72 mL:
92 mL : 88.72 mL
Simplifying the ratio by dividing both sides by the greatest common divisor, we get:
46 : 44
So, the ratio between 92 mL and 3.0 fl oz is 46 : 44, or it can be further simplified to 23 : 22.
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Which four abiotic factors make up climate?
temperature, moisture, sunlight, wind.
sunlight, water, biotic factors, the lithosphere.
the atmosphere, rain, light, organisms.
weather, plant life, biotic factors, water.
Answers
Answer:
temperature, moisture, sunlight, wind
Explanation:
Answer:
Tempature, Moisture, Sunlight, Wind.
Explanation:
I know this because i had a quiz with this question.
I hope that this helped! Remember Stay safe and Stay smart!!!
why RNA chain is always transcribed on 3' to 5' template strand ?
Answers
Explanation:
RNA growth is always in the 5′ → 3′ direction: in other words, nucleotides are always added at a 3′ growing tip, . Because of the ANTIPARALLEL nature of the nucleotide pairing, the fact that RNA is synthesized 5′ → 3′ means that the template strand must be oriented 3′ → 5′.
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Which of the following statements is true concerning biodiversity?
Answers
Last one - Biodiversity is the diversity of species in an area, which makes an ecosystem better prepared for major changes
Explanation:
If one crop struggles to grow then there will be plenty of others to substitute it. If a prey animal is dying at a faster rate and harder to find, predators can have other prey options and so forth. Biodiversity makes it so ecosystems can get past change.
Answer:
a
Explanation:
Which is NOT a function of the trachea?
a- warm the air's temperature and moistens it as it is inhaled
b- carries air from the nose down toward the lungs while preventing choking
c- assists in the production of sounds when you speak
d- traps debris in mucus which is swept upward towards the nose by cilia
Answers
Answer: A, as that is the job of the nostrils
the right of a court to choose to do or not to do something particularly in relation to sentencing an offence is known as
Answers
Answer:
I HOPE IT WILL HELP U
Explanation:
guidelines
9. Javier is a navigator for the navy His ship has just lost all power in the middle of the ocean, including access to your GPS. Which astronomical tool would be MOST helpful in this situation?
Answers
In which order does the process of neuro transmission events occur?
A) electrical impulse reaching the presynaptic neurons
B) excitation of postsynaptic on the neuron
C) release of Neurotransmitters from presynaptic neuron
D) binding of neurotransmitters to receptors
E) diffusion of neurotransmitters in the postsynaptic neuron
F) removal and destruction of neurotransmitters
Answers
The correct order of the process of neurotransmission events is as follows:
A) Electrical impulse reaching the presynaptic neuron
C) Release of neurotransmitters from the presynaptic neuron
D) Binding of neurotransmitters to receptors on the postsynaptic neuron
B) Excitation of the postsynaptic neuron
E) Diffusion of neurotransmitters in the postsynaptic neuron
F) Removal and destruction of neurotransmitters
The process begins with an electrical impulse, also known as an action potential, reaching the presynaptic neuron.
This electrical impulse triggers the release of neurotransmitters from vesicles in the presynaptic neuron (C).
The released neurotransmitters then cross the synaptic cleft and bind to specific receptors on the postsynaptic neuron (D).
This binding of neurotransmitters to receptors causes a change in the postsynaptic neuron's membrane potential, leading to its excitation (B).
After the neurotransmitters have served their purpose, they undergo diffusion in the postsynaptic neuron (E).
This diffusion allows the neurotransmitters to move away from the receptors and be cleared from the synaptic cleft.
Finally, the neurotransmitters are either taken back up into the presynaptic neuron for recycling or broken down and destroyed (F).
Overall, this sequence of events ensures the transmission of signals from one neuron to another in the nervous system.
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Why is it said that natural selection acts on phenotypes rather than on the genetic material of organisms?
Answers
Answer:
It's because an organism's phenotype, or physical traits, are what truly decide whether it can reproduce and pass on its genotype to the following generation.
Because the phenotype of an organism represents the alleles that are actually expressed in that organism, natural selection affects that phenotype.
Explanation:
Which part of the cell holds genetic information in the molecule DNA? vacuole Golgi body chromosomes ribosome
Answers
Answer:
the answer is chromosomes. I hope this helps :)
Explanation:
Where does cellular respiration get
the energy to make ATP? *
A. Chemical energy from sugars
B.Light energy from the Sun
C.Energy stored in the covalent bonds of
water molecules
D.Energy stored in the covalent bonds of
carbon dioxide molecules
Answers
Answer:
I believe A.
Explanation:
Cellular respiration gets energy to make ATP from the food you eat, so, A.