Why did Alfred hershey and Martha Chase choose to use bacteriophages in their research?

A cell biologist carefully measured the quantity of DNA in grasshopper cells growing in cell culture. Cells examined during the

Tamiku [17]

Answer:

100 units

Explanation:

The mother cell contains 200 units of DNA. During cell division, this amount is split between the daughter cells produced and each daughter cell will receive half of the amount of DNA present in the parent cell.

Since mitotic cell division process gives rise to 2 daughter cells, each daughter cell will receive 100 units of DNA.

5 0

3 years ago

Why do people sex why do they need to

nekit [7.7K]

To make babies
they need to make babies for population growth
but some ppl also have sex for fun,pleasure
lol hope it helps

5 0

2 years ago

Read 2 more answers

Placing pressure on a cut will constrict blood vessels manually, and encourages ________.

Makovka662 [10]

I am certain that placing pressure on a cut will constrict blood vessels manually, and encourages vascular spasms.
Vascular spasms are sudden, brief tightening of the muscle cells inside the walls of a blood vessels. It is the first response as the blood vessels constrict to allow less blood to be lost. In the second step, platelet plug formation, platelet stick together to form a temporary seal to cover the break in the vessel wall, the third step is the coagulation or blood clotting.

6 0

3 years ago

In chemistry class we learn the rule "like dissolves like" when studying why polar substances dissolve in each other (like sucro

Lyrx [107]

<h2>The correct answer is: d.</h2>

Explanation:

As per the question, the correct answer is to be chosen from the given options that is identical to the logic given in the statement of the question that is, "like dissolves like".
Polar molecules can get dissolved in water because they are hydrophilic or water-loving in nature. They have such functional groups in their structure which have the capability of forming hydrogen bonds with water molecules, hence get dissolved in water.
Non-polar molecules can get dissolved in non-polar solvents like fats and oils because either of them are hydrophobic or water-hating in nature. They have such functional groups which can form hydrophobic and Van-der-Waal's forces of interaction with each other , hence they get dissolved in non-polar solvents.
Polar and non-polar substances are unable to get dissolved in each other because the polar molecules are incapable forming hydrophobic or Van-der-Waals forces of interaction with the non-polar molecules and the non-polar molecules are incapable of forming hydrogen bonding with the polar molecules.
Trans-membrane proteins are those which remain integrated in the lipid bilayer of the plasma membrane and spans across the membrane forming a connection between the cell interior and the cell exterior.
They are required for transporting small polar molecules and ions across the plasma membrane.
The lipid bilayer of the plasma membrane is otherwise impermeable to the movement of polar molecules and ions due to the hydrophobicity of the lipid molecules.
The trans-membrane proteins are amphipathic molecules, that is, they are made up of both polar and non-polar amino acid residues.
These amino acid residues are such arranged in the structure of the proteins that the non-polar amino acids face towards the lipid molecules in the bilayer thereby forming hydrophobic and Van-der-Waals forces of interaction with the lipid molecules.
The polar amino acids face towards the channel or lumen formed by the protein across the lipid bilayer so that they can form hydrogen bonds with the polar molecules and ions which are transported across the plasma membrane.
Hence, like interacts with like.

8 0

3 years ago

The smaller veins in the leaf connect to the ___ of the leaf

8090 [49]

The smaller veins in the leaf connect to the <u>margin </u>of the leaf.

<u>Explanation:</u>

The structural and important part of the plant is the leaf. The leaf is the main source of photosynthesis. The leaf has small vein like structures to carry the prepared food and energy sources to be distributed throughout the plant.

The smaller veins in a netted pattern run across the leaves to meet the margin of the leaf. The veins run laterally from the midrib to the margins hence providing a proper network and hence passing of the nutrients made feasible in an accommodative way.

4 0

3 years ago