What is the term of the study for weather and climate

What proportion of DNA molecules will contain any radioactivity after two rounds of replication?

Vladimir [108]

Answer: After two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

Explanation:

In semi-conservative replication, two DNA molecules are created, each consisting of one strand of the original DNA and one new complementary strand. In other words, the DNA is formed from one old strand and one new strand. And the existing strands serve as a complementary mould to the new ones.

Meselson-Stahl's experiment involves growing the bacterium Escherichia coli in a medium containing radioactive nitrogen. Watson and Crick had predicted that DNA replication was semi-conservative, if so the DNA extracted from the bacteria would be somewhere in between the DNA extracted from the "normal" nitrogen medium and the radioactive nitrogen medium.

DNA replication, which occurs only once in each cell generation, requires many "building blocks", enzymes, and a great deal of energy in the form of ATP. The nucleotides, which are the building blocks of DNA, have to be assembled and available in the nucleus along with the energy to bind them together. Each nucleotide consists of three parts: a nitrogen-containing ring structure called a nitrogen base, a five-carbon sugar, and at least one phosphate group.

Through the action of DNA polymerase during replication, new nucleotides bind to the corresponding nucleotide of the original chain (A to T, C to G).

Since the DNA strands are anti-parallel, and replication proceeds only in the 5' to 3' direction on both strands, one strand will form a continuous copy, while the other will form a series of short fragments known as Okazaki fragments. The chain that is synthesized continuously is known as the forward chain and the chain that is synthesized in fragments is known as the backward chain.

Then, since replication is semi-conservative, the new strand will have nucleotides with "normal" nitrogen while the new strand created from that same DNA molecule will incorporate nucleotides with radioactive nitrogen. So, after two rounds of replication half of DNA molecules will contain one strand with radioactive nitrogen. And the other half will contain two strands with radioactive nitrogen.

7 0

3 years ago

Lynn has a disease called multiple sclerosis. This disease makes her muscle coordination difficult. Multiple sclerosis results f

love history [14]

Of the following given choices;

A. a lack of electrolytes in the brain

B. fatty mitochondria

C. two nuclei in some neurons

D. progressive deterioration of the myelin

The answer is D.

Musciplte sclerosis is an autoimmune condition in which the immune system of the subject attacks the nervous system. Specifically, the immune system attacks the myelin sheath of neurons as though they are foreign hence causing them damage. Myelin sheath protects the neurons and also allows impulses to pass along the axon much quicker than it would be without the sheath.

6 0

3 years ago

assuming that your producer level has 3,500,000 kilocalories of energy/area, use the rule 10 percent in energy transfer to calcu

Shtirlitz [24]

Answer: I think you have to divide each level by 10 so the first level will stay the same and the rest go like this

3,500,000 divided by 10 equals 350,000

350,000 divided by 10 equals 35,000

and 35,000 divided by 10 equals 3,500

Explanation:

I don’t know if it’s correct

5 0

3 years ago

Which of the following sentences adequately defines a club moss?

mina [271]

Answer:

A club moss is a vascular plant that does not produce seeds, but does produce spores in conelike tips.

Explanation:

4 0

3 years ago

If a child is born with an insufficient amount of growth hormone, he or she will develop dwarfism. Do you think that such a chil

Anuta_ua [19.1K]

Answer:

Growth hormone deficiency can result in dwarfism.

Children with this deficiency have abnormally short statue.

Explanation:

Growth hormone deficiency can result in dwarfism when inadequate amounts of growth hormone are produced in the body. Children that have this hormone defieciency possess an abnormal short stature and normal body proportions. This condition occurs when the pituitary gland do not produce enough growth hormone.

Growth hormone therapy in little children have been a subject of great ethical debate. The benefits of this therapy in children may not necessarily provide the means to overcome the short physical or psychological impact. The studies show individual variability in growth response. Growth hormone injections that is needed for treatment require careful consideration by the patient and parents.

6 0

3 years ago