Which of the barbiturates would you expect to be the more effective sedative? barbital hexethal?

Existing strand of nucleotides we call primer.Synthesize DNA primers through specific sequences that bind to other sequences of a single-thread DNA molecule.

A primer must be synthesized by an enzyme called primase, which is a Kind of RNA polymerase, before DNA replication can occur.

The making of a primer is require because the enzymes that synthesize DNA, which are called DNA polymerases,  only linked to new DNA nucleotides to an strand of nucleotides.

Thus,  DNA primers through specific sequences that bind to other sequences of a single-thread DNA molecule.

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Final answer:

Primers for PCR are chemically synthesized by commercial vendors based on specific sequences provided by geneticists. Taq polymerase, used in PCR for its heat stability, is derived from Thermus aquaticus. RT-PCR involves converting RNA to cDNA prior to PCR amplification.

Explanation:

Scientists obtain primers to be used in Polymerase Chain Reaction (PCR) through chemical synthesis from commercial vendors. Primers are short, synthetic, single-stranded DNA molecules that are complementary to the regions flanking the target DNA sequence that needs to be amplified. To design these primers, the geneticist must know sequences that are adjacent to the target DNA region. Once the forward and reverse primers are designed, they are synthesized by the vendor to match the specific sequence required for the PCR process.

The commonly used Taq polymerase in PCR is a heat-stable DNA polymerase derived from the thermophilic bacterium Thermus aquaticus, which can withstand the high temperatures during the PCR steps. The enzyme's stability is essential since the PCR involves repeated heating and cooling cycles to denature DNA, anneal primers, and extend the DNA strands.

In the case of Reverse Transcriptase PCR (RT-PCR), cDNA is synthesized from an RNA template before the PCR begins, aiming to amplify RNA sequences by converting them into DNA.

Amino acids with hydrophilic R-groups are most likely to be located on the surface of proteins and in the exposed regions of membrane-embedded protein chains. This arrangement allows these hydrophilic side chains to interact with the surrounding water-based environments, thus maintaining the structural stability of the proteins.

In proteins, the sections that are most likely to contain amino acids with hydrophilic R-groups are at the surface of the proteins. This is due to the polar nature of these hydrophilic R groups. Consider the basic structure of an alpha helix and a ß-pleated sheet. In the alpha helix, there are 3.6 amino acid residues per helical turn, and the R-groups protrude outwards. The same applies to ß-pleated sheets, where 'pleats' formed by hydrogen bonding cause the R-groups to extend above and below the folds. The crucial part is, to maintain the stability of a protein, in the globular formation, the hydrophobic or nonpolar amino acids are usually located in the interior while the hydrophilic or polar amino acids are on the exterior. This arrangement permits the hydrophilic R-groups to interact with the surrounding aqueous environment.

For example, amino acids like serine, threonine, and cysteine, which are polar and have hydrophilic side chains, are frequently found on the protein's outer surface. Additionally, basic amino acids like lysine and arginine, with their positively charged side chains, also often occupy this surface position.

In membrane proteins, hydrophilic amino acids are often found in the regions of the amino acid chain that are exposed to the aqueous environment, either outside of the cell or inside the cytoplasm.

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The answer is conjunctiva. It is a mucus membrane that is responsible of covering the eye. It is comprise of stratified squamous epithelium and even stratified columnar epithelium that makes the stretchable when pulled and back to its original shape.

You can determine initial value of 'n' for a photon of a given wavelength during electron transition, using Rydberg formula, with the final state being the ground state of the hydrogen atom where n1 = 1.

To calculate the value of 'n' for an electron that emits a photon of wavelength 95.04 nm when it returns to the ground state in the hydrogen atom, we need to use the Rydberg formula that relates the wavelength of light emitted by an electron transitioning between energy levels in a hydrogen atom:

 1/λ = R * (1/n1² - 1/n2²)

Where, R = Rydberg constant = 1.097 x 107 m⁻¹, n1 and n2 are the principal quantum numbers of the initial and final energy states of the electron(m is the ground state), and λ is the wavelength of the emitted light.

Since the electron goes back to the ground state, n1 = 1, and we know the wavelength λ = 95.04 nm. The only unknown here is n2, which we can determine by rearranging and solving the equation.

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The correct answer is is formed by evenly distributed pressure.

The correct answer is: Scalpel, scissors, tweezers, and a dissection tray are commonly used tools in frog dissection.

Frog dissection is a common laboratory exercise in biology education, where students learn about the anatomy and physiology of amphibians. The following tools are typically used during a frog dissection:

1. Scalpel: A small, sharp blade used for making precise incisions in the frog's skin and underlying tissues.

 2. Scissors: Dissection scissors are used to cut through muscles, tissues, and other structures that are too tough for the scalpel.

3. Tweezers: Also known as forceps, tweezers are used to hold and manipulate organs and tissues during dissection, allowing for a closer examination.

 4. Dissection tray: A shallow tray that provides a clean, flat surface for the dissection. It often has raised edges to prevent fluids from spilling and grooves or pins to secure the specimen in place.

 5. Probe: A blunt tool used to explore and move around organs and other structures without causing damage.

 6. Dissection pins: These are used to secure the frog to the dissection tray.

 7. Gloves: To protect the hands from formaldehyde (a preservative used in specimen storage) and other biological materials.

8. Safety goggles: To protect the eyes from any splashes or debris during dissection.

9. Dissection manual or guide: To provide students with step-by-step instructions and diagrams to follow during the dissection process.

10. Magnifying glass or dissection microscope: For a closer look at smaller or more intricate structures within the frog's body.

 These tools are essential for a successful dissection, allowing students to carefully explore the internal anatomy of the frog and learn about its various organ systems."

Microtubules originate on the centre of the cell taking the positive end to the periphery of the cell, while the negative end remains turned to the centre of the cell. The melanosomes move along these microtubules using motor proteins desiganted kinesins and dyneins. The kinesins are responsible for moving the melanosomes to the positive end of the microtubule (periphery of the cell) generating dark-colored cells, whereas dyneins move the melanosomes to the negative end of the microtubule (centre of the cell) generating light-colored cells.

Cells change the distribution of melanosomes using microtubules and motor proteins like dynein and kinesin that act as transportation systems within the cell.

Cells in animals that can rapidly change color use microtubules and motor proteins to change the distribution of melanosomes, which carry pigment. These components function similarly to conveyer belts, transporting various cellular cargo, including pigment-containing vesicles known as melanosomes. The light or dark appearance of the cells is a result of the pattern of melanosome distribution, which is controlled by motor proteins such as dynein and kinesin that move along microtubule tracks. Dynein generally moves cargo towards the center of the cell (retrograde transport), while kinesin moves it towards the periphery (anterograde transport).

Final answer:

ATP and NADPH are synthesized during the light-dependent phase of photosynthesis.

Explanation:

The synthesis of ATP and NADPH occurs during the light-dependent phase of photosynthesis. In this phase, light energy is captured by pigments in the thylakoid membrane of the chloroplasts, and used to convert ADP and inorganic phosphate (Pi) into ATP through a process called photophosphorylation. NADPH is also produced by transferring electrons from water molecules, which are split in a process called photolysis, to NADP+.

A gene cannot react chemically to form a trait f the proper enzymes are not present. The formation of a trait from the gene is dependent on the expression of the gene. The gene expression is a process which involves the help of the various enzymes. The absence of any of these essential enzymes will make it impossible for the gene to express the trait for which it is coded.

Hence, the answer is 'enzymes'.

Answer:

A gene cannot react chemically and form a trait without the proper _____.

enzyme

Genes and biochemical factors, such as neurotransmitters and hormones, play a role in eating disorders and happiness. Imbalance in neurotransmitters and hormones can affect appetite, eating behavior, and mental health. Medications can help balance neurotransmitters and improve symptoms of conditions like depression.

Genes are likely to be involved in the development of eating disorders because having a close biological relative with an eating disorder increases one's own risk tenfold or more. At a biochemical level, eating disorders are thought to be caused by the deregulation of neurotransmitters such as serotonin and dopamine. Imbalance in these neurotransmitters is likely to affect appetite and eating behavior. Deregulation of the hormones leptin and ghrelin may also be involved in eating disorders. These two hormones normally help maintain the body's energy balance by increasing or decreasing food intake. This occurs through the regulation of appetite and eating behavior. If these hormones are out of balance, the imbalance will affect appetite and may lead to disordered eating.

Researchers believe that genetic factors influence happiness by means of determining the availability of norepinephrine in the brain and the set point around which happiness tends to settle. These factors can influence the speed of transmission of neural messages and the sensitivity of dopamine receptors. For example, some people have low levels of the neurotransmitter called serotonin in their brain, which is one cause of depression. Medications called antidepressants help bring serotonin levels back to normal and control the symptoms of depression.

Answer:

correct answer polarity and size

Explanation:

The passive transport does not need external energy whereas the active transport need the input of external energy.

Endocytosis is a process for moving items that are outside of the cell into the cytoplasm of the cell. Exocytosis is a process for moving items from the cytoplasm of the cell to the outside.

Diffusion is the passive process where the movement of molecules along with the concentration gradient.

It helps in the movement of substances whether solute or solvent in and out of the cells from a region of higher concentration to a region of lower concentration gradient.

Liquid and gaseous state of the substance move by diffusion process,  some factors affecting diffusion process Temperature, Area of Interaction, Size of the Particle, concentration gradient.

Diffusion is important as it is involve in respiration by diffusing the carbon dioxide gas out through the cell membrane into the blood, also occurs in plant cells mainly root hair cells, ions movement across the neurons.

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