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arlik [135]
3 years ago
10

Ryan is looking at a cell under a microscope, he observes formation. he observes spindle microtubules from the centrosomes. whic

h phase of the cell cycle is he observing?
A: Metaphase.

B: anaphase

C: prophase
Biology
2 answers:
vivado [14]3 years ago
7 0

The right option is C: prophase

Prophase is the phase of the cell cycle Ryan is observing.

Prophase is the first stage of mitosis during which the chromatin condenses to form the visible chromosomes. Also, a structure known as mitotic spindle which is composed of long proteins (microtubules) begin to form from the opposite ends of the cell (centrosomes) and a part of the nucleus where ribosomes are produced disappears during this phase.


Elina [12.6K]3 years ago
5 0
Out of the choices, the phase of the cell cycle that Ryan is observing is the prophase cycle. The correct answer choice C. 
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Answer:

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8 0
3 years ago
What percent of iodine has decayed if 5 half lives have passed?
goldfiish [28.3K]

Hello!

A half-life is the amount of time it takes half of an element to decay. For example, after one of carbon's half-life, half of carbon would've decayed.

Now, we can calculate how much has decayed if 5 half lives have passed.

1 -> 50% (1) -> 25% (2) -> 12.5% (3) -> 6.25% (4) -> 3.125% (5)

Therefore, there would be 3.125% left of iodine. However, your question is asking what percent has decayed. Therefore, subtract 3.125 from 100% to get your final answer.

100 - 3.125 = 96.875

Therefore, your final answer is 96.875% of iodine has decayed if 5 half lives have passed.

Hope this helps!

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