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3 years ago

Which phase of drug development is associated with continual evaluation of the drug?

1 answer:

7 0

There are three phases of clnic study and one post approval phase required by the Food and Drug Administration (FDA) for a New Drug Application (NDA). Phase IV which is a common stipulation by the FDA includes continual evaluation of the drug after approval has been granted.

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In the diagram below you can see structures that work together to allow flowering plants to reproduce.

mart [117]

Complete question:

Several structures work together to allow flowering plants to reproduce. The diagram shows a typical flower.

Which answer correctly identifies the function of each structure or group of structures in the reproduction of the plant?

X- pollen production

Y- pollen transfer

Z- production of eggs

X- attraction of pollinators

Y- production of male sex cells

Z- egg production

X- production of eggs

Y- pollen transfer

Z- pollen production

X- production of eggs

Y- pollen production

Z- pollen transfer

Answer:

X- attraction of pollinators

Y- production of male sex cells

Z- egg production

Explanation:

Flowers are reproductive structures in charge of sexual reproduction through the production of seeds.

Z, Feminine reproductive structures:

The central structure is known as a carpel, also recognized as the pistil.
The base of the carpel forms the ovary, in which the eggs are produced and where the zygote develops.
The opposite extreme of the carpel is the stigma, in the superior part. The stigma is a sticky surface where the pollen grains get attached.
The ovary and the stigma are connected by a filament named style.

Y, Masculine reproductive structures:

The pollen grains, or male sex cells, are produced in the stamens.
The stamen has an anther where the pollen is produced, and a filament that provides support.

When mature, pollen grains are driven to the stigma of the same flower or other flowers of the species, where they stick. Once in the stigma, the pollen grains move to the ovary, where they meet the egg and fertilize. The zygote develops in the ovary.

X, External non-reproductive structures:

Flowers also have external structures known as petals and sepals. These structures are modified leaves whose principal function is to protect the flower´s fertile parts and attract pollinators. Petals characterize as having many different colors that make the flower more attractive to insects and some animals. When they visit a flower searching for their recompense, the flower´s pollen grains transfer to the insect´s body. The insect transports the pollen to the next visited flower, leaving it in the stigma of the second flower.

3 0

3 years ago

List the quality control measures taken to ensure contamination does not occur during the Chelex extraction process (DNA extract

Gwar [14]

Answer and Explanation:

To promote a good DNA extraction through the Chelex extraction protocol, it is important to follow some measures, which are essential for the entire process to take place efficiently.

The most important measure is to avoid contamination. In this case, all surfaces, container and substances used must be properly sterilized, preventing unnecessary elements from coming into contact with the DNA sample or the protocol reagents.

It is important that the researcher is wearing clean, appropriate clothing and gloves when using this protocol. This avoids impurities and contamination with the researcher's DNA.

Another precaution must be taken with the DNA sample and the reagents that will be used during the extraction. All must be stored correctly, preventing their degradation, especially the DNA, which is a very unstable molecule.

Finally, the researcher must strictly follow all the steps of the protocol as indicated.

8 0

3 years ago

Which phase of water has the greatest amount of kinetic energy

const2013 [10]

Answer:

the ultimate phase

Explanation:

7 0

3 years ago

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A number of antibiotics attack prokaryotic protein synthesis, but not eukaryotic protein synthesis. Name two common antibiotics

Rus_ich [418]

Answer:

Streptomycin and Erythromycine.

Streptomycin: inhibit protein synthesis by combining irreversibly with 30s subunit mRNA.Thus the normal synthetic sequences is disrupted.

Streptomycin does not stop protein synthesis in eukaryotic cells because it does not bind to eukaryotic ribosomes.

Erythromycine:The Erythromycine inhibits protein synthesis through interference with the binding 50s subunit ribosome.

Erythromycin does not estop protien synthesis in eukaryotic cells because it does not binds to eukaryotic ribosome.Specificity towards prokaryotes relies upon the absence of 50S ribosomes in eukaryotes.

Antibiotics block processes that occur in prokaryotic cells but not in eukaryotic cells that's why they not affect ekaryotes.

Explanation:

Antibiotics are simply chemicals that kill prokaryotic cells but do not harm eukaryotic cells. They are natural chemicals produced by fungi and bacteria that act to control their bacterial competitors.

Antibiotics block processes that occur in prokaryotic cells but not in eukaryotic cells that's why they not affect eukaryotes.

There are different classes of antibiotics inhibit different steps of prokaryotic life cycle.

Streptomycin and Erythromycin are group of antibiotics that inhibit protein synthesis of bacteria.They are specifically effective against prokaryotes does not inhibit protien synthesis of eukaryotes.

3 0

3 years ago

Huntington's disease is caused by a dominant allele. if one of your parents had the disease, what is the probability that you, t

Jet001 [13]

There's a high chance that you'll inherit this disease. It affects about 3-7 out of every 100,000 people of European descent.

3 0

3 years ago

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