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Setler [38]
3 years ago
12

If a molecule’s concentration outside the cell is higher than it is inside the cell , that solution is??

Biology
1 answer:
slavikrds [6]3 years ago
6 0

Them the solution is hypertonic. This means that the water within the cell would exit it and go outside and the cell would shrink.

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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
7. Some cancers are caused by mutations that stop certain proteins from working. The inactivation of what kind of protein could
Viefleur [7K]

Answer: p53

Explanation:

In most cases, the p53 gene is mutated, giving rise to a stable mutant protein whose accumulation is regarded as a hallmark of cancer cells.

7 0
3 years ago
Which of the following is a possible entire nucleotide found in a DNA molecule? (1 point)
damaskus [11]
Deoxyribose+phosphate group+polymerase can be found in DNA molecule.
6 0
3 years ago
What are the positive and negative effects of road construction in rainforest
Georgia [21]

Answer: Some consequences of building the road are that it will provide loggers access to highly-valued trees, provide a more accessible trade route for merchants and farmers, affect the wildlife and water quality in the area, and possibly cause indigenous populations to relocate.

Explanation:

7 0
2 years ago
The human metallothionein IIA gene (hMTIIA) is transcriptionally regulated through the interplay of regulatory elements and tran
forsale [732]

Answer:

The correct answer is - regulation of the heavy metal and their toxicity.

Explanation:

Metallothionein is a group of cysteine-rich, small in size, and highly conserved proteins that bind to various metal ions and regulate their activity or toxicity in transcriptional level.

Metallothionein IIA is one of the metallothioneins that binds to heavy metal and helps cells to be protected from the toxicity of these heavy metals. These proteins are present in almost every eukaryotic organisms virtually. These proteins are highly induced to express highly in the present of heavy metals.

Thus, the correct answer is - regulation of the heavy metal and their toxicity.

5 0
3 years ago
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