Can someone please answer my last question its in biology and 7th grade
its easy plz help, its due today!!

Answer:

Astronomy is the study of celestial objects. In other words, the study of anything having to do with the things of outer space.

Explanation:

The word astronomy comes from a Greek word that means "star-arranging."

Answer:

Astronomy is the study of the Universe

Explanation:

Hope this helps out

The regulation of transcription by the lac repressor and cap under what environment does the E. coli show a high level of transcription of the lac operon. The E. coli shows a high level of transcription of the lac operon in the absence of glucose and presence of lactose.

The lac operon is one of the most frequently analyzed operons in E. coli which involves in the catabolism of lactose.Lac operon is composed of an operator, a promoter, and three structural genes: lacZ, lacY, and lacA. The lac repressor and cap proteins regulate the expression of the lac operon in E. coli.

The lac repressor is a protein that blocks the transcription of the structural genes (lacZ, lacY, and lacA) by binding to the operator site in the absence of lactose. In the presence of lactose, it cannot bind to the operator site due to the formation of an inducer-lac repressor complex, which allows RNA polymerase to transcribe the genes.

The cap (catabolite activator protein) is a protein that binds to the promoter site of the lac operon, allowing RNA polymerase to bind to the promoter site to initiate transcription. The presence of glucose inhibits the production of cAMP, which is necessary for the activation of the cap protein.

Therefore, the expression of the lac operon is regulated by the presence of glucose and lactose, which acts as an inducer for the operon. In the presence of lactose and absence of glucose, the lac operon is highly expressed, resulting in the production of the enzymes required for lactose metabolism.

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Answer:

The correct answer is - Pons.

Explanation:

The pons is located t below the midbrain and below the midbrain. It is a group of nerves that function as a connection between the cerebrum and cerebellum.

It is related to the various functions of the body such as sleeping, respiration, swallowing, bladder control, hearing, and many more. These functions

Answer:

Reactants

Explanation:

In the reaction:

             C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O + ATP

  The reaction is a metabolic reaction that produces energy from the breakdown of glucose when it reacts with oxygen.

In the reaction    C₆H₁₂O₆ and O₂ are the reactants.

These are the raw materials need for the reaction to proceed in the right direction successfully.

On the right hand side, we have the products.

Answer:

i think is b

Explanation:

but not sure

hope this helps

The fertilization was two eggs by two different sperm. Option A

Two eggs produced by two unique sperm. The dizygotic twins Tanisha and Tawanda are fraternal twins. When two different eggs are fertilized by two different sperm during the same menstrual cycle, fraternal twins are the result.

Twins are produced when two fertilized eggs grow into individual fetuses, yet they are genetically related but not identical. Because of this, despite being identical twins, Tanisha and Tawanda do not look alike.

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Missing parts

Tanisha and Tawanda are twins but do not look alike. They are the result of the fertilization of:

A) Two eggs by two different sperm.

B) Two eggs by the same sperm.

C) One egg by two different sperm.

D) One egg by the same sperm

The main answer to your question is that the system responsible for Molly's release of adrenaline, increased heart rate, and faster pace is the sympathetic nervous system.

The explanation for this is that the sympathetic nervous system is a part of the autonomic nervous system, which regulates involuntary body functions such as heart rate and adrenaline release.

When Molly becomes separated from her group and experiences panic, her sympathetic nervous system activates the "fight or flight" response, increasing her heart rate and pace.

In summary, the system responsible for Molly's panic and increased physical responses is the sympathetic nervous system.

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Answer:

information and heredity

Explanation:

The big idea in biology most concerned with DNA is genetics, which studies genes, heredity, and genetic variation. DNA carries genetic information and is the blueprint for the development and function of living organisms.

Answer: Hemoglobin is crucial for oxygen transport in the blood because oxygen has a low solubility coefficient in water. :)

The emergence of antibiotic resistance in hospital settings indicates that certain bacteria have developed the ability to withstand the effects of antibiotics, rendering them less effective or ineffective in treating infections.

Antibiotic resistance occurs when bacteria undergo genetic changes or acquire resistance genes that allow them to survive exposure to antibiotics that would normally kill or inhibit their growth. In hospitals, the close proximity of patients, extensive use of antibiotics, and frequent transmission of bacteria between patients create an environment conducive to the development and spread of antibiotic-resistant strains. This poses a significant challenge in treating infections and increases the risk of healthcare-associated infections that are difficult to control. Effective infection control measures, appropriate antibiotic stewardship, and the development of new antibiotics are critical in addressing antibiotic resistance in hospital settings.

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Explanation:

Eukaryotic cells have a membrane bound nucleus and prokaryotic cells don't.

Magnification= hight of the image÷ height of the object.

Gly-leu-phe is changed to gly-tyr-phe would occur if a deletion is produced (option c).

The type of genetic mutation is a missense mutation is a substitution change in all the open reading frame or orf of the nucleotide sequence, thereby altering all the downstream amino acids that will be encoded by using such a sequence, while in this case, we observed a change in the ORF due to a deletion.

Therefore, with this data, we can see that deletion does not proud a missense mutation because this last involves a substitution.

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Chloroplasts and some prokaryotes share similar photosynthetic reactions supports the model.

Mostly found in plant and algal cells, plastids—a type of membrane-bound organelle—known as chloroplasts carry out photosynthesis. While releasing oxygen from water in the cells, the photosynthetic pigment chlorophyll absorbs energy from sunlight, transforms it, and stores it in the energy-storage molecules ATP and NADPH.

A single-celled organism known as a prokaryote is devoid of a nucleus and other membrane-bound organelles. Prokaryotes were categorized within the empire Prokaryota in the two-empire scheme. On the other hand, prokaryotes are split into two domains in the three-domain method, which is based on molecular analysis.

Some prokaryotes and chloroplasts both undergo similar photosynthesis processes. Only a small subset of species, including cyanobacteria, algae, and plants, are capable of photosynthesis.

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Answer:

Fossils are formed in many different ways, but most are formed when a living organism (such as a plant or animal) dies and is quickly buried by sediment (such as mud, sand or volcanic ash).

Answer:

Explanation:

electrical systems in satellites will fail

Answer:

they are small and flexible, they contain hemoglobin, and they have a disc shape to maximize their oxygen absorbtion

Explanation:

Answer:

depends (CONTINGENCY clause)

Explanation:

example:

Henrietta Lacks

USA is capitalist

companies make money off of using people's genes, cells & tissues

money motivates the companies to do the research that saves lives

but it should be done on CONTINGENCY

meaning

if one makes money from the use of genes then they should pay the patent holder

if they dont make money they shouldn't have to pay the patent holder

sort of like how some lawyers are paid

if a client wins then lawyer is paid

if a client loses then lawyer does not have to paid

Prevention of microbial growthThe prevention of microbial growth can be achieved through various methods including cleaning, decontamination, and proper preparation for future use.

The methods that are used are dependent on the item in question. Here are the methods of cleaning or preparing each of the items for next use:

Surgical equipment for a corneal transplant: After each surgery, surgical equipment for a corneal transplant should be properly cleaned and disinfected. A high-level disinfection solution that contains hydrogen peroxide, peracetic acid, or glutaraldehyde is recommended to kill bacteria, viruses, and other pathogens.

Insulin for injection into a diabetic: Insulin for injection into a diabetic should be stored in a cool, dry place, such as a refrigerator. The injection site should be properly cleaned with an alcohol swab or other antiseptic solution to prevent contamination of the area. The insulin should be properly mixed before use to ensure that the proper dosage is administered to the patient.

A patient’s abdomen for a surgical incision: The patient’s abdomen should be properly cleaned with soap and water before the surgical incision. An antiseptic solution, such as iodine or chlorhexidine, should be used to clean and disinfect the area. This helps to prevent the spread of bacteria and other pathogens into the body during the surgical procedure.

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Oligodendrocytes are the glial cells that myelinate axons in the brain and spinal cord.

Oligodendrocytes wrap their cell membranes around axons, forming a layer of insulation that speeds up the transmission of nerve impulses.

Myelin sheaths are made up of multiple layers of oligodendrocyte plasma membrane, with the cytoplasm squeezed out in between. This results in a very thin, tightly packed sheath that acts as an electrical insulator.

The myelin sheath increases the speed of nerve conduction by up to 100 times, allowing messages to travel much more quickly along axons.

This is essential for the efficient communication between neurons, and is necessary for many cognitive functions, including learning, memory, and movement.

Oligodendrocytes are found throughout the central nervous system, but they are most abundant in the white matter, which is made up of bundles of myelinated axons.

The white matter is responsible for carrying information between different parts of the brain and spinal cord.

Myelin sheaths are essential for the proper functioning of the central nervous system, and damage to these sheaths can lead to a variety of neurological disorders, including multiple sclerosis.

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Answer:

Articular articular cartilage is very important part of the long bone structure. It is present between the bones at the joints and help in reducing the friction between the joints. the epiphytes is data present at the end of the long bones are usually have a covering of the articular cartilage and it has a very thin layer of cartilage that helps in reducing the friction .

It also act as a shock absorber between the two bones and helps in the transmission of force from one phone to another and divide the force across the skeletal system. It also transmit the force on the bones with low fictional coefficient. The articular cartilage are very susceptible and prone to the injury and it lacks blood vessels and nerves. Articular cartilage is made up of hyaline cartilage and is made up of densely packed extracellular matrix which certain type of specialised cells known as chondrocytes. It is also made up of water , collagen , proteoglycans and glycoproteins .

Articular cartilage is necessary for long bones primarily because it acts as a protective cushion and facilitates smooth movement within joints.

Articular cartilage is a smooth, white, and rubbery tissue that covers the ends of bones in synovial joints. It acts as a cushion between the bones, allowing them to move smoothly against each other.

Articular cartilage is made up of cells called chondrocytes, which are embedded in a matrix of collagen fibers and proteoglycans. The collagen fibers provide strength and support, while the proteoglycans help to absorb shock and keep the cartilage moist.

Articular cartilage is avascular, meaning that it does not have its own blood supply. Instead, it gets its nutrients from the synovial fluid that bathes the joint.

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Organic molecules are transported in the body by a variety of structures, including the bloodstream, lymphatic system, and the gastrointestinal tract.

The bloodstream is made up of several components, including red blood cells, white blood cells, and platelets, which all play a role in transporting organic molecules throughout the body. The lymphatic system is responsible for collecting and transporting fluids and other waste from the body’s tissues and is composed of lymph vessels, nodes, and organs like the spleen and thymus.

The gastrointestinal tract also plays an important role in transporting organic molecules and is made up of several parts including the stomach, small intestine, and large intestine. Each of these structures work together to ensure that organic molecules are properly transported throughout the body.

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A scientific explanation for a set of observations that can be tested and is written with an "if/then" statement is referred to as hypothesis and is denoted as option B.

This is defined as the proposed explanation for a particular phenomenon before several experiments are conducted by others in different parts of the world to confirm its authenticity.

It employs the use of words such as "if/then" which shows its unproven status which is therefore the reason why it was chosen as the most appropriate choice.

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Answer:

After World War II, economic growth, population growth, rapid suburbanization, and the closing of some public transit systems led to more reliance on personal vehicles for transportation. The number of cars and trucks in the United States increased dramatically, as did the number of highways. One result of the rapid increase of motor vehicles was air pollution, especially in cities, that had serious impacts on public health and the environment.

Answer:

c. Getting lots of calcium

Explanation: is correct

Answer:

1. Aorta

2. Pulmonary Artery (left)

3. Pulmonary Veins (left)

4. Left Atrium

5. Bicuspid Valve

6. Aortic Semi-Lunar Valve (one of the av valves)

7. Left Ventricle

8. Right Ventricle

9. Tricuspid Valve (one of the av valves)

10. Right Atrium

11. Pulmonary Semi-Lunar Valve

12. Superior Vena Cava

Explanation: is correct

The correct order of the overall steps of a primary and secondary immune response is:

First exposure to antigen (antigen recognition by immune cells)

Latent period (time for immune cells to activate and proliferate)

Secondary response and overall increased IgG, IgM production (re-exposure to antigen triggers faster and stronger response with increased antibody production)

A second exposure to antigen (re-exposure to the same antigen)

Primary response and IgG, IgM production (initial response to antigen, with the production of IgM followed by IgG)

During the first exposure to an antigen, the immune system recognizes and responds to the antigen by producing specific antibodies, primarily IgM. The latent period follows, where the immune system needs time to activate and produce more immune cells.

During a second exposure to the same antigen, memory cells from the primary response are activated, leading to a more rapid and robust secondary response, with higher levels of antibody production, primarily IgG.

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The correct order of the overall steps of a primary and a secondary immune response is:

First exposure to antigen

Latent period

Secondary response and overall increased IgG, IgM production

Second exposure to antigen

Primary response and IgG, IgM production

During the primary immune response, when the body first encounters a pathogen, it takes some time for the immune system to mount an effective response. This is because the immune system needs to recognize the pathogen, activate immune cells such as B cells and T cells, and produce antibodies that specifically target the pathogen. The initial exposure to the antigen triggers a latent period, during which the immune system is gearing up to fight the pathogen.

After the initial exposure, the immune system will produce antibodies such as IgM and IgG that specifically target the pathogen. This is known as the primary immune response, and it typically takes several days to reach its maximum effectiveness.

During the secondary immune response, if the same pathogen is encountered again, the immune system can mount a much faster and more effective response. This is because the body has already produced memory cells that "remember" the pathogen from the first exposure. When the pathogen is encountered again, the memory cells can quickly produce large amounts of IgG and other antibodies that target the pathogen. This secondary response leads to an overall increased production of IgG and IgM, which can quickly neutralize the pathogen and prevent the onset of disease.

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Answer:

mother - AO

father - BO

All of the above are correct. Topoisomerases are enzymes that are responsible for changing the number of base pairs in a DNA molecule. They are found in both bacteria and eukaryotes, but the mechanism by which they operate may differ.

In bacteria, topoisomerases are essential for uncoiling and recoiling the DNA molecule during processes such as replication and transcription. In eukaryotes, topoisomerases also play a role in these processes, but they may also be involved in DNA repair and chromosome condensation. Regardless of the organism, topoisomerases are critical for maintaining the integrity and stability of the DNA molecule.

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Answer:

Explanation:

others are; Bacteria and  Archaea

fungusvirusbacteriagerms