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Georgia [21]
4 years ago
10

Describe the experiments that revealed the structure of the genetic material. If a sample of DNA contains 8% adenine (A), then w

hat are the percentages of thymine (T), cytosine (C), and guanine (G)
Biology
2 answers:
alexdok [17]4 years ago
7 0

Answer:

Explanation:

One of the earlier experiments that confirmed DNA and not proteins as genetic material was conducted by Alfred Hershey and Martha Chase

Hershey and Chase experiment showed the genetic material of virus is DNA not protein. Their experiments demonstrated that Phage are composed of DNA and protein, when phage infect bacteria, their DNA enters the host bacterial cell but not protein before infection

Hershey and Chase experiment prove that DNA is the hereditary material.

From chargaff base pairing rule, the ratio of purine to pyrimidine is a cell is 1:1. Since adenine pair with thymine and cytosine pair with quanine, this means the percentage of adenine will equal the percentage of thymine.

%A = %T and %G = %C.

%A + %T + %G + %C =100

If a DNA contains 8% adenine, therefore the percentage of thymine is 8%

8% + 8% + %G +%C = 100%

16% + %G +%C = 100%

%G +%C = 100%-16%

%G +%C = 84% = 84%/2= 42%

Since %G = %C

Then %G = 42%, %C = 42

Aliun [14]4 years ago
5 0

Answer: 8% Thymine

The DNA structure is complementary. The bases are in equal proportion on each side of the strands.  Adenine always pair with thymine. while cytosine pairs with Guanine in the usual Purines-Pyrimidine paring fashion.

Adenine and Guanine are Purines . and Cytosine and Guanine are Pyrimidine.

Therefore if there are<u> 8 % of Adenine bases</u> on one DNA strand, the same bases percentage of pyrimidine <u>8% Thymine</u> should be on the opposite strands of DNA chain for perfect complementary paring.

Explanation:

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1. Describe the staggering challenge that Velings describes at the beginning of his talk.
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The staggering challenge that Velings describes at the beginning of his talk is option B:  B. Depleting food resources as our population grows.

2. In 35 years when there are 2.7 billion more of us, the solution given that we will still be sharing the same resources is option D. All of the above

A. Aquaculture

B. Use the ocean as farmers instead of hunters

C. Sustainable fishing

Some of the reasons Velings gives for fish being the best possible food are:

A. Exciting and diverse variety

C. Provides key amino acids and fatty acids

F. Prevents heart disease

Some issues with the current state of the aquaculture industry that contribute to its bad reputation is option F. All of the above:

A. Fisheries are badly managed.

B. Fisheries deplete mass amounts of fish to use as fish meal.

C. Fisheries often use a large amount of chemicals.

D. Fisheries can alter the genetic pool.

E. Many fisheries use unsustainable fish-feed ingredients.

<h3>What is Mike Velings talks about?</h3>

Industrial aquaculture has had a wide range of negative effects on the environment, including the overfishing of wild fish to feed carnivorous farmed fish and the escape of farmed fish from their containment, which endangers local wild fish populations.

Lastly, in the words of Mike Velings, We are approaching a worldwide food crisis, he said. At our current rate, we are already taking more fish from the ocean than it can naturally replace, despite the fact that almost 3 billion people rely on the ocean for their food. Mike Velings, an entrepreneur and conservationist, offers a solution in this fact-filled, eye-opening talk: the practice of farming fish. "We need to stop hunting the ocean and start farming it,"

Learn more about Depleting food resources  from

brainly.com/question/9796760
#SPJ1

See full question below

(4.2) Unit 4 Lab Questions- Portfolio (1-6, 1-6)

Part 2 - Please watch the following video and answer the questions that follow.

Mike Velings: The case for fish farming

https://youtu.be/a7cDt5r2pGY

What is the staggering challenge that Velings describes at the beginning of his talk? (1 point)

A. Water pollution affecting the fish farms.

B. Depleting food resources as our population grows.

C. Climate change reducing the amount of fresh fish available

(4.2) Unit 4 Lab Questions- Portfolio (1-6, 1-6)

2. In 35 years when there are 2.7 billion more of us, what is the solution given that we will still be sharing the same resources? (1 point)

A. Aquaculture

B. Use the ocean as farmers instead of hunters

C. Sustainable fishing

D. All of the above

E. None of the above

(4.2) Unit 4 Lab Questions- Portfolio (1-6, 1-6)

3. What are some of the reasons Velings gives for fish being the best possible food? (check all that apply) (1 point)

A. Exciting and diverse variety

B. Reduces the rate of cancers

C. Provides key amino acids and fatty acids

D. Makes people more intelligent

E. Allows the land animals to increase their populations

F. Prevents heart disease

What are some issues with the current state of the aquaculture industry that contribute to its bad reputation? (1 point)

A. Fisheries are badly managed.

B. Fisheries deplete mass amounts of fish to use as fish meal.

C. Fisheries often use a large amount of chemicals.

D. Fisheries can alter the genetic pool.

E. Many fisheries use unsustainable fish-feed ingredients.

F. All of the above

G. None of the above

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