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LiRa [457]
3 years ago
14

The table below shows the initial and final masses of a radioactive material whose half-life is 15 years.

Biology
2 answers:
Murljashka [212]3 years ago
7 0

Answer:

A

Explanation:

1 half-life = .4 kg = 15 years

2 half-life = .2 kg = 30 years

3 half-life = .1 kg = 45 years

4 half-life = .05 kg = 60 years

Burka [1]3 years ago
4 0

Answer:

A

Explanation:

Initial mass is 8. The half-life is 15 years.

1st half life=.8/2=.4

2nd half life=.4/2=.2

3rd half life=.2/2=.1

4th half life=.1/2=.05

For each half life that it took it to go from .8 to 0.05, you add 15 years since that is the half life of the substance. 4*15=60.

So, the answer is A. The material decayed from 0.8 kilograms to 0.05 kilogram in 60 years.

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In an analysis of the nucleotide composition of DNA, which of the following proportions will be found?
katrin [286]

Answer:

With respect to the composition of DNA, in an analysis it can be found that the proportions of nucleotides are A + C = G + T (option a).

Explanation:

The proportion of nucleotides in a DNA molecule can be established according to the sequence of these nucleotides on both complementary strands, since the purinic bases of one strand are complemented by the pyrimidinic bases of another:

  • <em>Adenine is complemented with Thymine A=T</em>
  • <em>Guanine is complemented with Cytosine G=C</em>

From this we can deduce that in a DNA molecule with two chains there will be the same amount of adenine and thymine, as well as the same number of guanine with respect to cytosine, so:

<em>     A + C = G + T</em>

An example of this would be a known DNA molecule (hypothetical), with 5 molecules of Adenine and 7 molecules of Guanine. In this case there are 5 Thymines, complementary with Adenine, and 7 Cytosines like Guanine:

<em>     A + C = G + T</em>

<em>     5 + 7 = 7 + 5</em>

6 0
3 years ago
Which of the following are examples of genetic drift?
Marysya12 [62]

Answer:

E hope this helps

4 0
2 years ago
Which of the following was most likely not present in creating the fatty acids of early Earths waters of the past?
mrs_skeptik [129]
I believe the first answer is #4 and the second is #1. Please correct me if I am wrong. 
4 0
3 years ago
because you may come in contact with organisms you cannot see (microbes), what safety procedure must be followed?
Elan Coil [88]

Hello there!

Usually, the procedures you should follow is using hand sanitizer or just washing your hands. That can help remove some microbes, but it is inevitable to not get any germs on you

^Hope it helps

4 0
3 years ago
What is the role of ADH (antidiuretic hormone) in regulating salt and water concentrations in the blood?
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So the answer you are looking for is B. <span>It prompts the kidneys to reabsorb more water into the bloodstream to dilute the salts.

I hope this helps!</span>
8 0
3 years ago
Read 2 more answers
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