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Usimov [2.4K]
3 years ago
7

If one strand of DNA reads ATTGAC, the opposite strand would read __________.

Biology
2 answers:
Vesna [10]3 years ago
4 0
The opposite strand would read TAACTG because the two pairs are A-T and C-G of the nucleic bases.
stich3 [128]3 years ago
4 0
A has a reverse of T, while T has a reverse of A. G and C also reverse each other so the opposite strand would be TAACTG
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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
2 years ago
What links the two strands in a dna helix together in the middle
Doss [256]
They are held together by weak hydrogen bonds
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The outer core is believed to behave most like a liquid.
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MAIN IDEA: Life depends on hydrogen bonds in water. Choose whether the statement is true or false. 1. true / false Polar molecul
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2. True

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2. Water is a polar molecule because of the partial +tive and partial -tive charge hence it dissolves polar solute(solute with ions)

3.The more electronegative region bonds with an electrophile to form a weak bond(Hydrogen bond)

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What is it called when particles move across a membrane/barrier?
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The answer is diffusion.


Facilitated diffusion is a process by which molecules are transported across the plasma membrane with the help of membrane proteins.

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