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jeyben [28]
4 years ago
12

Two quick multiple choice biology questions! (For a couple extra points) ANSWER BOTH SERIOUSLY OR YOUR ANSWER WILL BE REMOVED

Biology
1 answer:
monitta4 years ago
5 0
 Short answer is: D and A :) If you need an explanation, tell me and i will be happy to explain 
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The nervous system is the major ______ system of the body.
strojnjashka [21]
Central nervous system. and automatically nervous system .it is mainly spinal cord system of the body.
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4 years ago
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
What type of molecule speeds up chemical reactions in living things?
iren [92.7K]

The best answer is  B - Proteins.

Proteins make up enzymes, or to put it another way enzymes are made up of protein. It is enzymes that speed up the chemical reactions. Enzymes are organic catalysts, substances that speed up a (biochemical) reaction but do not take part in the reaction and remain unchanged at the end of the reaction.

In man, there are many enzymes. The majority of these are found in the digestive system where they greatly aid the process of food breakdown from complex molecules to simple molecules. Examples include salivary amylase found in saliva,  which begins the gradual breaking down of starch into glucose right from the moment food is placed in the mouth and mixed with saliva. Pepsin in the stomach breaks down protein.

4 0
4 years ago
If water vapor continued to increase in our atmosphere, what changes would you expect in freshwater lakes?
guajiro [1.7K]

Answer;

Lake temperatures will increase, but dissolved oxygen in the water will decrease.


Explanation;

If water vapor continued to increase in our atmosphere, Lake temperatures will increase, but dissolved oxygen in the water will decrease.

As the temperature of the atmosphere rises, more water is evaporated from the surface of the lakes. This causes an increase in the relative humidity leading to more water vapor in the atmosphere. The result is decreased the amount of dissolved oxygen in the water

8 0
4 years ago
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Jackson, a 4-year-old boy, is unable to get the measles (MMR) vaccine due to a severe allergy to the antibiotic neomycin. Jackso
lilavasa [31]

Answer:

In Lincoln Elementary School.

Explanation:

I advise them to send Jackson to Lincoln Elementary School which has 95% vaccination rate for MMR because there is less chances of having measles to Jackson as compared to Oak Crest Elementary School having 80% vaccination rate for MMR. Yes, Jackson is at risk of contracting measles because of no immunity acquire against measles disease by its body. The vaccine can provides immunity to Jackson from the disease but he can't take it due to allergy.

4 0
3 years ago
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