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4 years ago

What must happen before a chemical reaction can begin?

Biology

2 answers:

Nitella [24]4 years ago

3 0

The answer should be <span>The activation energy must be reached.</span>

ankoles [38]4 years ago

3 0

Answer:

The reactants need to reach activation energy.

Explanation:

For a chemical reaction there need to be:

1.- The reactants ( the elements or compounds that are going to react).

2.- The activation energy (the necessary energy to start changing the matter in the interchange of atoms among the reactants).

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Can someone explain Meiosis 1 and II to me like I'm a baby? (i really don't understand it!) 15 pts

topjm [15]

Answer:

Meiosis 1 is when the homologous chromosomes separate and crossing over occurs. Meiosis 2 is when the sister chromatids seperate and produces 4 haploid daughter cells.

Explanation:

The phases of Meiosis 1 are, Interphase, Prophase 1, Metaphase 1, Anaphase 1, Telophase 1 & Cytokinesis.

Interphase: DNA is replicated and organic material is synthesized.

Prophase 1: Chromosomes pair up

Metaphase 1: Crossing Over occurs and chromosomes line up at the equator.

Anaphase 1: Chromosomes pull apart

Telophase 1 & Cytokinesis: Cell pinches to both sides and begins to pull apart as the cytoplasm is copied.

The phases of Meiosis 2 are, Prophase 2, Metaphase 2, Anaphase 2, Telophase 2 & Cytokinesis.

Prophase 2: Two daughter cells are formed

Metaphase 2: Chromosomes line up at equator of both cells.

Anaphase 2: Sister chromatids are pulled apart in each cell.

Telophase 2 & Cytokinesis: The cells pinch to both sides as the cytoplasm is replicated and four granddaughter cells are formed.

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3 years ago

When the North Pole is tilted closest towards the sun, it is possible for areas within the Artic Circle to experience 24 hours o

umka2103 [35]

Answer:

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Explanation:

From the North Pole, the sun is always above the horizon in the summer and below the horizon in the winter. This means the region experiences up to 24 hours of sunlight in the summer and 24 hours of darkness in the winter.

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3 years ago

STRUCTURES AND FUNCTIONS The diagram below shows a Petri dish containing a bacterial culture and four paper disks (labeled A-D)

jok3333 [9.3K]

Answer:

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Explanation:

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3 years ago

CAN SOMEONE PLEASE FIND THE ANSWER!!!

loris [4]

Answer:

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4 years ago

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Aleks04 [339]

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3 years ago

Read 2 more answers