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Eva8 [605]
3 years ago
6

How do unicellular organisms living in water control the entry and exit of water?

Biology
1 answer:
larisa [96]3 years ago
6 0
Water typically diffuses in and out of cells depending on the concentration of solutes (other gunk not water) in both the cell and the external environment. Osmosis (the diffusion of water), happens from where the solute concentration is lowest to where the solute concentration is highest (or more sensibly, water travels to dilute the solute; so imagine if a cell with a lot of gunk in it swims into pure water, water will start to move into the cell).
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How would both the results of the hershey–chase experiment and conclusions drawn have been different if the viral dna had been a
Gnesinka [82]

Answer:

The bacterial pellet would have contained both isotopes, making it unclear which substance was the genetic material.

Explanation:

Bacteriophages are viruses that infect bacteria, those of the even T series (T2, T4 and T6). Hershey and Chase work with viruses that attack the enterobacteria Escherichia coli. Bacteriophages consisting of DNA viruses with a protein coat (capsid)

The infection process is that the virus injects its DNA into the bacteria. This viral DNA is inserted into the bacteria's DNA, which begins to make new copies (offspring) of the virus. After 25 minutes of injecting the DNA, the bacteria (host cell) explode, releasing hundreds of new bacteriophages. Since phages have only DNA and proteins, they were the appropriate tool to reveal the chemical nature of the hereditary material.

In 1952, Hershey and Chase designed an experience to find out if the inheritance was communicated by DNA or by proteins. They used radioactive labeling techniques to build two different types of phage populations (both T2). A population of phages grew in a medium containing the radioactive isotope S35. The S35 marks the proteins that contain the amino acids cysteine ​​or methionine and therefore this population contains radioactive proteins and not radioactive DNA, since the DNA does not contain sulfur. The second population of virus grew in a medium containing P32. P32 marks nucleic acids, but not proteins, so that this population contains radioactive DNA and non-radioactive proteins. Both types of viruses were used separately to infect susceptible E. coli cells.

4 0
3 years ago
You purchased equipment costing $1,000 to use for a lawn-mowing business to earn money for college during the summer. The first
rosijanka [135]

Answer:

$220

Explanation:

For Mowing:

Revenue:                                      $1,200

Additional cost:                              $(100)

Transportation cost :                      $(50)

Net Income               :                  $1050

For Painting:

Revenue:                                      $1,400

Additional cost:                              $(80)

Transportation cost :                      $(50)

Net Income               :                  $1270

Incremental Net income =   $1270 -  $1050

                                            = $220

7 0
3 years ago
A certain segment of DNA can be used as a molecular clock. Its rate of mutation is one mutation per 10 million years. Examine th
lawyer [7]

Answer:

The correct answer would be 30 million years.

The molecular clock is a technique used to determine the time when the two species diverged from a common ancestor. It uses the mutation rate to determine the same.

Mutation rate is the rate at which a number of mutations take place in a given unit time.

For example, the mutation rate in a given question is one mutation per 10 million years, that is, one nucleotide is mutated in 10 million years.

If we compare the DNA sequence of the given two species, we would find that three mutations have taken place.

Species A: CTTAAGCTAGTAAGGACC  

Species B: CATAAGTTAGTAAGGTCC  

Thus, 30 million years would have passed to evolve three mutations.

Hence, they must have shared a common ancestor around 30 million years ago.

4 0
3 years ago
Read 2 more answers
What does anabolic reactions do to NADH and ATP?
Gwar [14]
Anabolic reactions tend to use energy storing molecules such as NADH and ATP, as these reactions are endogenic reactions that require energy to form or synthesize more complex substances and molecules, building them up, and or assembling them from simpler compounds.
6 0
3 years ago
Carbon dioxide is returned to the atmosphere primarily by the
NISA [10]
Carbon dioxide is returned to the atmosphere primarily by the Respiration of animals and plants (the consumers). 

Explanation;
Respiration by both plants and animals is an important natural source of carbon dioxide. Carbon dioxide is a by product of the process of respiration, a chemical reaction that plants and animals use to produce energy they need to carry out day to day activities.
Plants and animals use this process to produce energy which is used to fuel normal activities such as growth and movement. The process uses oxygen to break down nutrients and release energy, but also creates water and carbon dioxide as byproducts. 
3 0
3 years ago
Read 2 more answers
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