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3 years ago

Meselson and Stahl's experiments proved that DNA replicates by which mode?

Biology

1 answer:

Irina18 [472]3 years ago

6 0

Answer:

Semi-conservative

Explanation:

Meselson–Stahl experiment proved that DNA replication is a semiconservative process, feeding E. colo bacteria with different types of Nitrogen isotopes (N14 and N15).

Changing the type of radioactive compound in different times of bacteria grow, they could observe that both of the isotopes were present on the bacteria culture.

Basically, if the bacteria present both of them, the DNA was replicated semiconcervely.

Guess what? they show both! (See the image for more information)

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a particular peach tree produces peaches that are more resistant to disease than other peaches. what method would reproduce thes

zhenek [66]

The best way to get the exact preach tree is through Asexual reproduction.

Asexual reproduction is the only method of reproduction in which the exact copies of genes in the parents are transferred to the offspring. If cross pollinations( Sexual reproduction') with the a peaches plants from a different parents plants takes place, genetic variation at meiosis will not permit the inheritance of the exact copies of genes for diseases resistance.

Therefore, it is ideal in this scenario to by pass crossing over and recombination at meiosis, in order get the exact copes of genes for disease resistance through mitosis in the offspring, asexual preproduction is used.

For more on asexual reproduction; brainly.com/question/4100787

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2 years ago

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xenn [34]

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2 years ago

Which statement correctly distinguishes the difference in a glucose structure in one of the polysaccharides

Mariulka [41]

Incomplete question. However, I provided some examples of polysaccharides and their varying glucose structures.

<u>Explanation:</u>

1. Glycogen and Starch: this polysaccharide has a glucose structure that consists of a hydroxyl (-OH) group which is attached to $C_{1}$ .

2. Amylose: The glucose structure is joined together by 1,4 glycosidic bonds in a helix form.

3. Amylopectin: In the glucose structure of Amylopectin it is observed that there are two types of bonding structure that exist, they are 1,4 and 1,6 glycosidic bonds.

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2 years ago

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uysha [10]

3 and 4 are correct. A compound is a collection of two or more molecules, whereas a molecule is a collection of two or more atoms. 1 is not true because its talking about two atoms together which is a molecule. 2 is not true because it is still talking about two atoms which is still a molecule. 3 is true because molecule are subunits of compounds. 4 is true because elements and atoms are the same thing, and two or more atoms is a molecule.

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3 years ago

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The high levels of pesticides found in birds of prey is an example of

marta [7]

////// it is biological magnification /////

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3 years ago