Both negative repressible and positive repressible operon.
What are negative and positive repressible operon?
A regulatory protein attaches to DNA during the negative control process and prevents transcription. For positive control, the situation is the opposite.
Operons that are negatively repressible require an inducer to bind to them in order to stop transcription.
Regulatory proteins are activators in the presence of positive control. In the case of positive repression, the inducer binds to the protein to change its structure, preventing it from binding to the DNA and allowing transcription to take place.
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Astrocytes A. all of these B. induce the formation of the blood-brain barrier C. physically support neurons D. are important in the repair of brain injuries and in neural formation E. take up excess K from the brain ECF
Astrocytes perform the function of all of the given options i.e., induce the formation of the blood-brain barrier, physically support neurons, are important in the repair of brain injuries and in neural formation, take up excess K from the brain ECF.
Both invertebrates and vertebrates have Astrocytes, a star-shaped cell kind of neuroglia, in their nervous systems. Astrocytes can be separated into protoplasmic and fibrous kinds. In the central nervous system's white matter, myelinated nerve fibers are frequently surrounded by fibrous astrocytes.Numerous cytoplasmic processes on astrocytes end on axons, neuronal cell bodies, blood vessels, and synaptic terminals.b) The development of the blood-brain barrier is aided by the Astrocytes
c) Astrocytes support neurons physically and metabolically.
d) Astrocytes help in transfer of blood-borne materials to the neuron, and injury response of the brain and repair of brain injuries.
e) They also help with detoxification, migratory guidance, energy metabolism regulation and removal of excess K from brain ECF.
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Once a subspecies evolves into a species, it may be unable to breed with another group from its original species. Barriers to this kind of reproduction include
Group of answer choices
geographic isolation.
infertility.
all of the choices.
lack of physical attraction.
Which structure is continuous with the septa that subdivide the interior of the testis into separate lobules
Tunica albuginea is continuous with the septa that subdivide the interior of the testis into separate lobules.
The human testis is about 1.5 to 2 inches long. It is covered by tunica albuginea which is a fibrous sac-like structure that also extends into the testis. These extensions act as partitions in the testis which helps in dividing the testis into 250 compartments (approximately).
The tunica albuginea sac is made up of type I collagen and a small amount of elastic type II collagen and elastin are also seen. Tunica albuginea has a bilayer structure in which the inner one is a circular layer and the outer one is the longitudinal layer. The emissary veins pass through the tunica albuginea and trap blood in the male reproductive organ when they become compressed (during engorgement).
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type 1 muscles are capable of generating the most energy due to the presence of more_____ and an increased rate in___ activity
Type 1 muscles are capable of generating the most energy due to the presence of more Mitochondria and an increased rate in Aerobic cellular activity.
There are two types of skeletal muscle fibers: slow-twitch (Type I) and fast-twitch (Type II). Longer durations of time require increased efficiency from type I muscle fibers. They are mostly utilized for exercises that require endurance or posture maintenance (such as holding the head up straight) (like marathon running).Possess an abundant supply of capillaries, a large number of mitochondria and aerobic respiratory enzymes, and a significant amount of myoglobin. Myoglobin, a crimson pigment that resembles hemoglobin found in red blood cells, helps the slow-twitch fibers receive more oxygen. The term "red fibers" is also used to describe slow-twitch fibers due to their high myoglobin concentration.learn more about Type 1 muscles here: https://brainly.com/question/26557931
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In working with Drosophila it is common to use a balancer stock to maintain mutations of interest. The balancer chromosomes are generally carrying multiple inversions on them. What effect would the inversions have on meiosis
The inversion would suppress recombination.
In Drosophila, the mutations which are recessive are lethal or recessive sterile. Balancer chromosomes are used to hold the deleterious mutations in stable shares as well as to save you recombination with the aid of suppressing.
Chromosomal inversions prevent the recuperation of recombinant chromosomes in ways.
the crossovers do now not shape within the location of inversion breakpoints, due to the fact synapsis is inhibited.unmarried crossovers' inner inversions result in aneuploid gametes that cannot give upward push to normal progeny.Drosophila is a genus of flies, belonging to the own family Drosophilidae, whose participants are often referred to as "small fruit flies" or (much less regularly) pomace flies, vinegar flies, or wine flies, a connection with the feature of many species to linger around overripe or rotting fruit.
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Which of the following is not a difference between Prokaryotic cells?
O Having a Nucleus
O The age of the cell
O The complexity of the cells
O The size of the cells
Answer:
The age of the cell
Explanation:
Assuming your question was meant to be "Which of the following is NOT a difference between Prokaryotic and Eukaryotic cells?", everything except the age is different.
Prokaryotes are simple cells that have no nucleus and are generally small. Eukaryotes are complex cells that have a nucleus, organelles, and are much bigger than prokaryotes.
What is a response?
A. the transmission of a signal through neurons
B. a change in the environment around an
organism
C. how an organism answers to a change in its
environment
D. the senses recognizing the surroundings
A response is how an organism answers to a change in its environment, which is option B. Details about response can be found below.
What is a response?A response in biology refers to any behavior of a living organism that results from an external or internal stimulus in the environment.
A stimulus is something external that elicits or influences a physiological or psychological activity or response.
Therefore, it can be said that a response is how an organism answers to a change in its environment (stimulus).
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Many plants use ---(1)--- so they appear dangerous themselves. this acts as a ---(2)--- to prevent their consumption by predators.
Many plants use spines so they appear dangerous. This acts as a defense mechanism to prevent their consumption by predators.
Plants have developed a variety of defense mechanisms to protect themselves from herbivores, which help them survive and reproduce. Mechanical defenses on the plant's surface, synthesis of complex polymers that impair the digestibility of the plant to animals, and development of poisons that kill or repel herbivores are all examples of these types of defenses. It is possible for a plant to have defenses that are inherent to the plant and that are activated when it is damaged or under stress.
Physical defenses serve as the initial line of defense for many plants. These defenses make plant consumption challenging for herbivores. Physical protection includes thorns on roses and spines on trees such as hawthorn. These physical barriers harm herbivores and prevent them from consuming the stems and leaves of plants.
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five reasons why it is important for substances to be transported into the cell
Answer:
Moving things in and out of the cell is an important role of the plasma membrane. It controls everything that enters and leaves the cell. There are two basic ways that substances can cross the plasma membrane: passive transport, which requires no energy; and active transport, which requires energy.Water, carbon dioxide, and oxygen are among the few simple molecules that can cross the cell membrane by diffusion (or a type of diffusion known as osmosis )
Explanation:
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Fe + O₂- Fe₂O3
What will make this equation balanced?
Answer:
Explanation:
Fe + O2 → Fe2O3 is the unbalanced form of chemical reaction.
Balancing the simple molecules first, in this case the O2
Fe + 3O2→ Fe2O3 there are now 6 O atoms on the left, there must also be 6 O atoms on the right.
Fe + 3O2 → 2Fe2O3
Balance the rest of the equation.
4Fe + 3O2→ 2Fe2O3
Dancers create their steps using their knee and hip joints. In what way do knee joints differ from hip joints?
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Cross-contamination can occur when uncooked foods containing live microbes come into contact with foods that have already been cooked. true false
Answer:
True
Explanation:
Cross-contamination is how bacteria can spread. It occurs when juices from raw meats or germs from unclean objects touch cooked or ready-to-eat foods.
i think it's the correct answer
Innate immunity includes all of the following EXCEPT Group of answer choices phagocytosis. inflammation. production of antibody. production of interferon. activation of complement.
Innate immunity includes all of the following EXCEPT option(c) i.e, production of antibody.
What is innate immunity?Innate immunity, also known as nonspecific immunity, is the defense mechanism you were born with and shielded from all antigens by it. Barriers that prevent hazardous substances from entering your body are a part of innate immunity. These barriers serve as the immune system's first line of defense.
Three protective mechanisms of the innate immune system can be distinguished: physical barriers, cellular components, and humoral responses.
There are four primary elements of innate immunity:
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True or false: The integument is strictly composed of the skin. It does not include the various accessory structures that may be present on or beneath the skin layers.
The statement that the integument is strictly composed of the skin and It does not include the various accessory structures that may be present on or beneath the skin layers is False.
Composition of integumentTogether with the underlying epidermal cells that secrete the cuticle, the cuticle and integument make up the skin. The cuticle functions as the insect's exoskeleton, the location of muscle attachment, and the first line of protection against fungi, bacteria, predators, parasites, and environmental toxins, including pesticides. The integument plays a role in behavior, osmoregulation, water control, eating, excretion, desiccation resistance, and as a food reserve. The complexity of the structure and chemistry of an insect's integument as well as the unique ways in which it has been modified to work within its owner's environment serve as some indicators of the variety of roles that these coverings play.To learn more about the Skin layers refer to:
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Which of the following is NOT one of the
abiotic factors that affects freshwater biomes?
A. nutrients
B. temperature
C. sunlight
D. rock formations
Answer:
D. rock formations
Explanation:
because it wouldn't affect the environment's qualities (only how it looks physically)
Rock formation is not one of the abiotic factors that affects freshwater biomes. So, the correct option is (D).
What are Abiotic Factors?Abiotic components are defined as the non-living chemical and physical parts of the environment that affect the functioning of living organisms and ecosystems. Abiotic factors and the phenomena associated with them underlie biology as a whole.
Some examples of abiotic factors in an ecosystem include sunlight, temperature, and the availability of nutrients.
So many organisms have evolved to be able to function in the presence of these abiotic factors that there are also organisms which can survive in the absence of these factors, such as some microorganisms that require a certain temperature range to grow.
Thus, Rock formation is not one of the abiotic factors that affects freshwater biomes. So, the correct option is (D).
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5. Which component of the lymphatic system filters lymph from the upper limbs and upper external part of the thorax
The subclavian trunks of the lymphatic system filter lymph from the upper limbs and upper external part of the thorax.
The lymphatic system is an open system and is a part of the immune system. It consists of lymphatic vessels, lymph nodes, lymphoid tissues, and organs.
The lymphatic system is responsible for the circulation of a clear fluid which is known as the lymph.
The lymph contains lymphocytes which help in fighting against infections and diseases. The lymphocytes are produced in the primary lymphoid organs which are the thymus and bone marrow.
The subclavian trunks are formed after the unification of the efferent vessels of the subclavicular groups.
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what is a membrane???????
Answer:
Membrane is a barrier which protects what comes in and out...
Explanation:
Hope It Helps!!!
A membrane is a thin wall or layer made up of biological substances such as cellulose or lipid.
What is the role of a membrane?A membrane is a thin sheet that protects the cell from the outer environment, and they make a sheet or separation between the cell interior and the exterior.
It helps in the transfer of material from the cell and in the cell and gives the cell structure and rigidity.
Thus, A membrane is a thin wall or layer comprised of cellulose or lipids, which are biological materials.
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Explain how african feminism can help you to implement equal opportunities for male and female teachers at your school.
African feminism can help you implement equal opportunities because it is a movement that fights for social equality and rights for women and seeks to combat the social model based on patriarchy and abuse and violence against women.
What does feminism stand for?Feminism is a social movement for civil rights, led by women, which from its origins claims
politicallegal and social equalitybetween men and women. Its performance is not sexist, that is, it does not seek to impose some kind of female superiority, but equality between the sexes.
With this information, we can conclude that In feminism, the woman thinks she is superior to the man in many other ways.
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In this experiment, optical density is measured using a _______. In this experiment, optical density is measured using a _______. microscope thermocycler spectrophotometer caliper
In this experiment, optical density is measured using a spectrophotometer.
The spectrophotometer is a device that calculates how much light a substance absorbs. The spectrophotometer measures the light intensity of a sample by passing a light beam through it. Based on the Beer-Lambert rule, spectrophotometers may determine a solution's concentration by measuring the light intensity with wavelengths.A spectrophotometer is a device that counts the number of photons (light's energy) absorbed after they have passed through a sample solution. By measuring the intensity of light detected, the spectrophotometer may also estimate the quantities of a known chemical compound.
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A ball is throwing up straight into the air what happens to the ball speed as it goes up and as it comes down?
Answer:
the speed of the ball remains the same.
Explanation:
due to newtons law of what goes up must come down applys to this question, and therefore the speed doesn't change.
Introns must be removed prior to translation of the mRNA. In addition, eukaryotic transcripts (mRNA) have to undergo two more steps before it can be translated. What are these steps?
Eukaryotic transcripts (mRNA) have to undergo capping and splicing before it can be translated.
RNA processing:1. An RNA transcript is first produced in a eukaryotic cell as a pre-mRNA, which needs to be converted into a messenger RNA (mRNA).
2. The RNA transcript is given a 5' cap at the start and a 3' poly-A tail at the end.
3. The process of splicing involves cutting out some RNA transcript segments (introns), then joining the remaining segments (exons) back together.
4. Some genes have the ability to alternate splices, which produces various mature mRNA molecules from the same beginning transcript.
The introns not only do not contain the information necessary to construct a protein, but they also need to be cut off in order for the mRNA to create a protein with the correct sequence. An mRNA with extra "junk" in it will be created if the spliceosome fails to remove an intron, and the translation process will result in the production of the incorrect protein.
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What is DNA replication and what are the steps 50 POINTS pls help fast
Answer:
In molecular biology, DNA replication is the biological process of producing two identical replicas of DNA from one original DNA molecule. Replication occurs in three major steps: the opening of the double helix and separation of the DNA strands, the priming of the template strand, and the assembly of the new DNA segment!! :)
If hunters remove all of the mountain lions, what impact would that have on the trees?
Please answer with a understandable explanation, using the image attached as a helping resource . ASAP
If hunters remove all of the mountain lions, the population of Deer will definitely increase that will affects the population of trees in negative aspects.
What is the Food web?The food web may be defined as the number of food chains interconnected with one another forming a web-like pattern.
In the image given above, the food web represents the delocalization of food and energy from one organism to another.
If hunters remove all of the mountain lions, the predator of deers gets eliminated, so now they got a chance to expand their population remarkably.
If the population of deer increases, the number of trees is declining due to the fact that deers derived their energy from trees.
Therefore, it is well described above.
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Vitamin B12 Is Important for the body to function. It helps keep nerve cells healthy, and it helps with the formation of red blood cells.
When someone is vitamin B12 deficient, one of the reasons could be that the person's
efficiently.
ghts reserved.
Reset
Next
large intestine
small intestine
stomach
is not
the vitamin efficiently?
Answer:
stomach
Explanation:
stomach does not make enough intrinsic factor protein, the intestine cannot properly absorb vitamin B12.
medlineplusgov
Drag the tiles to the correct boxes to complete the pairs.
Match each cause with the effect it had on jews during their time in Nazi ghettos.
1. The Nazis did not bother to arrange for the safe disposal of human waste and garbage in the ghettos. > answer
diseases were rampant in the ghettos
2. Food and other necessities became scarce in the ghettos.> answer
Many Jews died of starvation and poor health
3. The Nazis used healthy Jewish prisoners to perform hard labor.>
answer
Weak and sick Jews were the first to be deported to concentration camps.
these are the answers i just took the test!!
Pls can someone help with my hw?
The experimental designs are used in research to analyze and observe the changes to determine the result. In test tube, A (test) the lime water will turn milky, and test tube B represents the control.
What is an experimental design?An experimental design is a setup that is used to observe and compare the test results of the control from the test group. Here, test tube A is the test and B is the control group.
From the experiment, the lime water in the test group will turn milky as there is cricket on the gauze of the tube. The cricket will release carbon dioxide as the result of cellular respiration and in return will react with lime water to produce a milky solution.
Test tube B, act as control as only lime water is present but the cricket is absent. It will be used to compare the results with the test group and will help in determining the role of carbon dioxide.
Therefore, the lime water will turn milky in test tube A.
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If one person in 50 is a carrier of an autosomal recessive disorder in a population, the chance that an unrelated man and woman are both carriers is
If one person in 50 is a carrier of an autosomal recessive disorder in a population, the chance that an unrelated man and woman are both carriers is 1/2500.
What is the genetic likelihood?The expression 'genetic likelihood' refers to the estimation to have a given phenotype (in this case, a recessive disorder).
The genetic likelihood that an unrelated man and woman are both carriers for a disorder that has an incidence of 1/50 in the population is equal to 1/50 x 1/50 = 1/2500.
In conclusion, the chance that an unrelated man and woman are heterozygous (carriers) for a autosomal recessive disorder that exhibits an incidence of 1/50 in the population is 1/2500.
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Cytopathic effects are changes in host cells due to Group of answer choices viral infections. protozoan infections. fungal infections. bacterial infections. helminthic infections.
Cytopathic effects are changes in host cells due to viral infections. Thus, the correct option is A.
What are Cytopathic effects?Cytopathic effects may be defined as the process of structural transformations in a host cell resulting from viral infection.
Cytopathic effects happen when the infecting virus provokes lysis of the host cell or when the cell perishes without the process of lysis because of its ineptitude to reproduce.
As a result, this virus causes morphological transformations in the host cell is known as cytopathogenic.
Therefore, the correct option for this question is A.
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In pulmonary ventilation, the movement of gases is between the ______ and the ______. Multiple choice question.
In pulmonary ventilation, the movement of gases is between the atmosphere and the alveoli.
What are alveoli?The alveoli (singular alveolus) are sacs that fill with air during the respiratory process of higher animals.
These structures (alveoli) are located in the lungs where function to change oxygen and CO2.
In conclusion, gases move between the atmosphere and the alveoli.
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The P50 for myoglobin is 2.8 torr. At what oxygen concentration will myoglobin be 75% saturated with oxygen
At 8.4 torr myoglobin will be 75% saturated with oxygen.
Calculation :
P50 is the partial pressure of the system. To achieve 50% saturation of oxygen to bind to myoglobin, the partial pressure needed is P50
P50 =2.8 torr
so, Mb+ O2 = MbO2
K= [Mb] [O2]/[MbO2]......................(1)
Yo2 ( fractional saturation of myoglobin )
Yo2=[MbO2]/[Mb]+[MbO2]..........................(2)
From equations (1) and (2)
We get Yo2= [O2]/K+[O2]= Po2 /K+ Po2
i)Yo2= 50% =2.8/K+2.8
0.5= 2.8/k +2.8
So, K= 2.8
ii) 75 % = [O2]/K+[O2]= [O2]/2.8+ [O2] = 8.4
Therefore, the oxygen concentration will be 8.4 torr.
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