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Brrunno [24]
4 years ago
5

1) In an important experiment with E. coli Meselson and Stahl

Biology
1 answer:
Serggg [28]4 years ago
7 0

Answer:

C

Explanation:

Just took the test

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Meiosis takes place in the ______ of most organisms.<br> -Gonads<br> -Heart<br> -Brain <br> -Skin
Elan Coil [88]
Meiosis takes place in the gonads of most organisms. 

So the correct answer is A : Gonads.

Hope this helps :)
~Davinia.
7 0
3 years ago
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Iron-55 has a half-life of 3 years. How much of a 40 gram sample will remain after 12 years? A. 0 grams B. 4 grams C. 2.5 grams
Readme [11.4K]

Answer:

\boxed {\boxed {\sf C. \ 2.5 \ grams }}

Explanation:

We are asked to find how much of a 40 gram sample remains after 12 years.

Iron-55 has a half-life of 3 years. Therefore, after 12 years, 4 half-lives have been completed.

  • 12 years/3 years = 4 half-lives

Every time a half-life is completed, half of the sample's mass decays. Remember we start with a 40 gram sample.

  • 1 half- life: 40 g / 2 = 20 g
  • 2 half-lives: 20 g / 2= 10 g
  • 3 half-lives: 10 g / 2 = 5 g
  • 4 half-lives: 5 g / 2 = 2.5 g

There is also a formula that can be used to solve this problem.

A= A_o(\frac {1}{2})^{\frac{t}{hl}

Where A₀ is the initial amount, t is the time, and hl is the half-life.

We know 40 grams is the inital amount, 12 years is the time, and 3 years is the halflife.

  • A₀= 40 g
  • t= 12
  • hl= 3

A= 40 \ g (\frac{1}{2})^\frac{12}{3}

A= 40 \ g (\frac{1}{2})^4

A= 40 \ g * 0.0625

\bold {A= 2.5 \ g}

After 12 years, <u>2.5 grams </u> of Iron-55 will remain.

4 0
3 years ago
During which period did the first true mammals appear?
Serggg [28]
<span>During JURASSIC period the first true mammals appear.</span>
3 0
3 years ago
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Why would a plant store energy in the form of sugars using photosynthesis when the plant can make an unlimited number of ATP thr
AysviL [449]

Answer: They store energy because they may need it for winter. Take pine trees for example. They are fine through the winter because they have stored enough energy to keep their leaves. this works with regular trees to. The reason why trees don’t die in winter is because they store energy to last.

Explanation: Plants can’t use photosynthesis without light

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3 years ago
How are peptide bonds formed between amino acids in the elongation process of the translation of mRNA?
ValentinkaMS [17]

Answer:

amino acid meet up inside the ribosome. Once translation has begun, it continues down the line as mRNA shifts along through the ribosome. ... During elongation, amino acids are continually added to the line, forming a long chain bound together by peptide bonds

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